SRAM Truvativ HammerSchmidt Technical Manual
Contents
1. 07 s z5mmx colarPlateBots as A0 femme DwkBm los s 2mmher Use only the HammerSchmidt grease kit for re lubrication Poor performance and accelerated wear can be expected from use of other lubricants GEN 0000000000882 Rev A 19 TECHNICAL SERVICE If performance issues arise please consult the following table for possible solutions For more information please contact your local dealer or SRAM Dealer Service Issue Possible Cause Kup UU Stuckin Over Too little tension in shift cable Adjust the shifter by turning barrel adjuster on the shifter counter drive Loss of clockwise If barrel adjuster will not provide sufficient adjustment 1 1 Gear reattach cable at the cable anchor bolt per Shifter Installation Instructions Malfunctioning or damaged Cycle the shift lever several times to confirm proper function Replace shifter shifter if necessary Contaminated or improperly rout Check that housings are properly routed and that cable moves free ed shift cable housing ly within the housing Properly routed cables will take a smooth path to the cable stop and provide enough slack for handlebar and suspen sion linkage movement Clean and lubricate or replace housings if necessary Cable end pinched between collar Check to confirm that the excess cable beyond the cable anchor bolt is plate and frame or ISCG spacers trimmed to the correct length and2. 15 a light coat of grease over the entire actuator evenly g distributing it with a small grease brush or your finger Apply a light coat of grease to the corresponding recess in the collar plate 38 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual TECHNICAL SERVICE 16 Insert the actuator into the collar plate and install the actuator 16 spring by squeezing the tips together and pressing it into the collar plate recess Wiper Seal Reassembly Fit the wiper seal over the cable bolt tab on the actuator Seal Disk Reassembly 18 Replace the seal disk with the recessed side down GEN 0000000000882 Rev A 39 TECHNICAL SERVICE 19 Using a 2 mm hex wrench install the seal disk bolt Torque to 0 6 N m 5 0 in Ib Cable Anchor Bolt Reassembly Using a 4 mm hex wrench install the cable anchor bolt and washer Tighten to hand tight Overdrive Pawls Reassembly 21 AM a light coat of grease to pawl seats on the collar plate assembly Install the pawls in the collar plate assembly Make sure the pawls are oriented correctly The round end should be seated in the pocket and the square end should be exposed 40 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual TECHNICAL SERVICE Carefully stretch the overdrive spring around into the grooves of the collar plate and each of the pawls NOTE N Ul E Be careful not to damage the spring upon removal by
3. TV A h TRUVATIV PLEASE READ THE SAFETY AND WARRANTY INFORMATION INSIDE Copyright SRAM 2009 LLC SRAM LLC WARRANTY EXTENT OF LIMITED WARRANTY SRAM warrants its products to be free from defects in materials or workmanship for a period of two years after original purchase This warranty only applies to the original owner and is not transferable Claims under this warranty must be made through the retailer where the bicycle or the SRAM component was purchased Original proof of purchase is required LOCAL LAW This warranty statement gives the customer specific legal rights The customer may also have other rights which vary from state to state USA from province to province Canada and from country to country elsewhere in the world To the extent that this warranty statement is inconsistent with the local law this warranty shall be deemed modified to be consistent with such law under such local law certain disclaimers and limitations of this warranty statement may apply to the customer For example some states in the United States of America as well as some governments outside of the United States including provinces in Canada may a Preclude the disclaimers and limitations of this warranty statement from limiting the statutory rights of the consumer e g United Kingdom b Otherwise restrict the ability of a manufacturer to enforce such disclaimers or limitations LIMITATIONS OF LIABILITY To the extent allowed b
4. Increased Drag Contamination in mechanism Disassemble inspect clean and lubricate mechanism assembly assembly Wear or damage in mechanism Disassemble mechanism assembly and examine gear teeth and pawls assembly for wear or damage Incorrect ISCG spacers installed Confirm offset and spacer configuration on offset ISCG tabs ISCG tabs out of spec Use SRAM ISCG cutting tool and face ISCG tabs perpendicular to BB axis 20 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual TECHNICAL SERVICE issue PogsibleGause we Erratic Shifting Too little tension in shift cable Adjust the shifter by turning barrel adjuster on the shifter counter clockwise If barrel adjuster will not provide sufficient adjustment reattach cable at the cable anchor bolt per Shifter Installation Instructions Too much tension in shift cable Adjust the shifter by turning barrel adjuster on the shifter clockwise If barrel adjuster will not provide sufficient adjustment reattach cable at Malfunctioning or damaged shifter the cable anchor bolt per Shifter Installation Instructions Cycle the shift lever several times to confirm proper function Replace shifter if necessary Contaminated or improperly Check that housings are properly routed and that cables move freely routed shift cable housing within the housing Properly routed cables will take a smooth path to the cable stop and provide enough slack for hand
5. 25 N m 217 in Ib e 5 6 8 mm hex wrenches e HammerSchmidt grease kit e 24 mm wrench e Small grease brush optional e Small flathead screwdriver You must use the grease supplied in the HammerSchmidt grease kit unless otherwise specified Using any other grease will void your warranty MECHANISM ASSEMBLY AND DRIVE SIDE CRANK ARM REMOVAL Shift the HammerSchmidt into 1 1 by pressing the large shifter paddle Remove the chain according to the chain manufacturer s instructions EB Using an 8 mm hex wrench turn the self extracting crank bolt HE counter clockwise to remove the HammerSchmidt mechanism CG ib assembly and drive side crank arm b FUNCTIONAL INSPECTION OF THE HAMMERSCHMIDT MECHANISM ASSEMBLY 2 MU the mechanism assembly separated from the collar plate inspect the HammerSchmidt visually and by feel for wear and contamination Look inside the sun gear for dirt and debris It may be appropriate to wipe this area with a clean dry rag and re grease periodically opin the ring gear counter clockwise and feel for increased or unusual drag or play in the assembly as this may indicate the need for service 22 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual TECHNICAL SERVICE CHAINRING REMOVAL Using a flathead screwdriver gently pry the retaining ring off the ring guide Remove the guide ring and chainring BASH GUARD REMOVAL Using a 6 mm hex wrench loosen and remove t
6. allowed to move freely If not remove cable from pinch point Contamination on overdrive pawls Clean and lubricate overdrive pawls Contamination inside actuator Clean and lubricate actuator assembly internals assembly Broken overdrive spring Replace overdrive spring Incorrect ISCG spacers installed Confirm offset and spacer configuration on offset ISCG tabs stuck in 1 1 Too much tension in shift cable Adjust the shifter by turning barrel adjuster on the shifter clockwise If Loss of Over barrel adjuster will not provide sufficient adjustment reattach cable at Drive Gear the cable anchor bolt per Shifter Installation Instructions Malfunctioning or damaged Cycle the shift lever several times to confirm proper function Replace shifter shifter if necessary Contaminated or improperly rout Check that housings are properly routed and that cables move free ed shift cable housing ly within the housing Properly routed cables will take a smooth path to the cable stop and provide enough slack for handlebar and any sus pension linkage movement Clean and lubricate or replace housings if necessary Contamination inside actuator Clean and lubricate actuator assembly internals assembly Contamination in mechanism Disassemble inspect clean and lubricate mechanism assembly assembly Broken overdrive spring Replace overdrive spring Incorrect ISCG spacers installed Confirm offset and spacer configuration on offset ISCG tabs
7. into the groove and slightly back towards the section already in the groove Once the damper is in apply light pressure to the damper to smooth the damper and seat it evenly Verify that there are no twists in the damper Press a new ring spacer inside the damper The ring spacer will fit in tightly inside the damper and its outline should match the profile of the 1 1 pawl teeth 28 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual TECHNICAL SERVICE 24 Apply grease to the inside of the bearing Make sure you fill all of the gaps with grease Spin the bearing to evenly distribute the grease P3 Thoroughiv grease ring gear teeth and 1 1 pawl teeth LUBRICATE SUN GEAR ASSEMBLY 26 v grease to pawls pawl seats and spring groove of the sun gear 27 grease to the gear teeth and pawl teeth on the inside of the sun gear GEN 0000000000882 Rev A 2d TECHNICAL SERVICE REASSEMBLE MECHANISM ASSEMBLY Place the sun gear assembly inside the ring gear Rotate the sun assembly counter clockwise inside the ring to allow the 1 1 pawls to mesh with the corresponding pawl teeth 29 rorlv grease to the sun retainer groove Hold the sun firmly against the ring and flip the assembly over Using a flathead screwdriver reinstall the sun retaining ring by pushing it into the groove on the sun assembly Ensure the retaining ring is fully seated into the groove 31 a small dab of grease to the outside
8. of the bearing and the inside of the carrier assembly Using a grease brush or your finger spread the grease all the way around the edge of each 30 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual TECHNICAL SERVICE Place the bearing assembly on top of the carrier assembly Wiggle them together until the bearing assembly slides slightly into the carrier assembly Turn the ring gear counter clockwise to ensure the gears mesh properly Continue to turn the bearing assembly counter clockwise until it is fully hand threaded into the carrier assembly Place mechanism assembly on the base of the bearing removal tool so the tool pins fit into the recesses on the outer race 34 Place the tool clamp over the planet posts Using a 5 mm hex 34 34 wrench secure the clamp to the HammerSchmidt with the 34 planet nuts Torque to 5 6 N m 50 in Ib Using a 24 mm wrench tighten the mechanism assembly Torque to 25 N m 217 in Ib Remember the HammerSchmidt mechanism assembly is left hand threaded GEN 0000000000882 Rev A 31 TECHNICAL SERVICE CHAINRING INSTALLATION 36 Apply a small dab of grease to the splines and retaining ring groove of the ring gear Using a grease brush or your finger spread the grease all the way around the edge slide the chainring and guide ring into position Using a flathead screwdriver install the chainring retaining ring Make sure that it is fully seated in the groove of the
9. paddle Using a 4 mm hex wrench loosen the cable anchor bolt and remove the cable Remove the housing from the cable housing stop If you have ISCG 03 tabs remove the collar seal to access the HammerSchmidt mounting bolts Using a 4 mm hex wrench to remove the 3 mounting bolts Slide the collar plate off the bike 34 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual TECHNICAL SERVICE COLLAR PLATE DISASSEMBLY Chain Guide Removal If your chain guide is damaged and needs to be replaced locate the two screws that attach the chain guide to the collar plate and note their position You will want to reinstall the chain guide in the same position later Using a 2 5 mm hex wrench remove the screws and chain guide Cable Stop Removal EJ If your cable stop is damaged and needs to be replaced use a 2 mm hex wrench to remove the screws and cable stop Overdrive Pawl Removal 6 Using a pick carefully lift and pull back on the overdrive spring to remove it Be careful not to damage the spring upon removal by over stretching or kinking it If the spring is damaged upon removal replace it with a new one Remove the three pawls from their seats GEN 0000000000882 Rev A TECHNICAL SERVICE Seal Disk Removal 8 Using a 4 mm hex wrench remove the cable stop bolt and cable stop washer 9 Using a 2 mm hex wrench remove the disk bolt 10 Lift and re
10. teeth and the outer bearing and ensure these components are dry prior to applying fresh grease GREASE AND REASSEMBLE MECHANISM ASSEMBLY Use only the grease provided in the HammerSchmidt grease kit inside the mechanism assembly Poor performance and accelerated wear may be expected from use of other lubricants Reassemble Carrier Assembly 16 IN a generous amount of grease to the planet carrier surface and planet posts Install the planet gears onto the planet posts Grease should ooze from underneath the planets as they are pressed against the carrier 18 Install new planet retaining rings Be sure that these rings are completely seated in their grooves by pressing the ends in with a small screwdriver 19 v grease to the teeth and exposed face of the planets GEN 0000000000882 Rev A TECHNICAL SERVICE REASSEMBLE BEARING ASSEMBLY 20 Apply a thin bead of grease in the space between the bearing and the outer race Replace the bearing seal by placing it over the bearing and pressing it firmly into the groove on the outer race A screwdriver may be required to push the last portion of the bearing seal into the groove Ring Spacer and Damper Assembly If the ring spacer and damper were removed in disassembly they should be reassembled now Using a new damper press the wide portion of the damper into the back of the groove To seat the damper properly work around the circle pushing both
11. 18 Exploded view of Collar Plate Assembly 20 Crank Stop 21 Crank Stop Retainer 22 Collar Seal 23 Overdrive Spring 24 Overdrive Pawls 25 Collar Plate Mounting Bolts 26 Collar Plate 27 Chain Guide 28 Actuator Assembly 29 Actuator 30 Cable Anchor Bolt and Washer 31 Actuator Spring 32 Wiper Seal 33 Seal Disk p 36 Vice Tool SUSI 37 Tool Clamp 38 Shoulder Screw Copyright SRAM 2009 LLC HammerSchmidt Technical Manual TECHNICAL SERVICE SERVICE INTERVAL SCHEDULE To maintain optimal performance and durability of the HammerSchmidt periodic maintenance is required f you ride in extreme conditions maintenance should be performed more frequently We recommend that you have your Truvativ HammerSchmidt serviced by a qualified bicycle mechanic Servicing the HammerSchmidt requires advanced mechanical skill knowledge of planetary gear systems as well as access to and knowledge of use of the special tools required for service hours Collar Plate Mechanism and Crank BIS Clean dirt and debris from inside of mechanism and re lubricate oo HAMMERSCHMIDT SYSTEM TORQUE VALUES Recommended torque values for the HammerSchmidt are provided below Do not exceed the recommended torque values Over tightening can result in damage to the unit Bottom Bracket Bottom Bracket Cups m 41 363 Truvativ ISIS and GXP tools or equivalent Cable Housing Sep ote 06 5 2mmhe Ghain Guide Bons
12. 2 phone 1 312 664 8800 fax 1 312 664 8826 Wwww sram com european headquarters SRAM europe basicvveg 12 d 3821 br amersfoort the netherlands phone 31 33 450 6060 fax 31 33 457 0200 asian headquarters SRAM taivvan no 1598 8 chung shan rd shen kang hsiang taichung county 429 taivvan r o c phone 886 4 2561 3678 fax 886 4 2561 3686
13. ATION PART 2 Ok are you ready for the final and most critical step in frame preparation Step 3 A N Replace the bottom bracket facing cutter on your tool with the ME Flush Truvativ ISCG tab facing cutter that is appropriate for your size ISCG tabs and remove all spacers from the cutter e f your ISCG tabs are flush with the face of the bottom bracket shell zero offset you will only be facing the tabs to ensure they are parallel to the bottom bracket shell face Face the ISCG tabs using the same method provided by the manufacturer of your bottom bracket facing tool If the cutter does not completely face the surface of each tab add a 0 5 mm spacer to the cutter tool and face again When you are finished facing be sure the ISCG tab surface is smooth and free from burrs and debris NOTE If you added a 0 5 mm spacer to the cutter you now have a 0 5 mm offset to your tabs Write this number down you will need it later e f your ISCG tabs are offset inboard of the face of the bottom bracket shell you will need to determine that offset prior to facing so you can space the cutter tool to match Use the depth stick on the caliper and measure the depth at all three tabs Select the largest of the three numbers and write it down this is your offset Locate your offset in the chart below and select the spacer or combination of spacers from those supplied with the Truvativ ISCG cutter The cutter comes with 0 5 m
14. N INTRODUCTION Your days of front shifting as you know it are over Welcome to instant front transmission Welcome to HammerSchmidt HammerSchmidt is a front transmission so fast and so seamless it s magical It gives you the security of a single chainring with the gear range of a double HammerSchmidt provides better ground clearance and flawless shifting shifting under load while coasting or even standing still This revolutionary instant shift is accomplished with the proprietary HammerSchmidt X 0 and X 9 trigger shifters HammerSchmidt s front transmission design is comprised of five main components HammerSchmidt bottom bracket crank arm collar assembly mechanism assembly and trigger shifters each working in perfect concert allowing you to react to terrain in ways you ve never imagined before Take a peek below at the anatomy of HammerSchmidt ANATOMY HammerSchmidt Non Drive Side Crank Arm HammerSchmidt Trigger Shifters Chain Guide Collar Assembly HammerSchmidt Mechanism Assembly with Drive Side Crank Arm 6 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual INSTALLATION PARTS AND TOOLS NEEDED e Safety glasses e Bottom bracket facing tool and cutter Park Tool BFS 1 or e HammerSchmidt frame compatibility checker similar e 2 2 5 4 D and 8 mm hex wrenches e HammerSchmidt ISCG tab facing cutter e Flathead screwdriver e Cutting Oil e Cable cutters e Truvativ ISIS and GXP bottom bra
15. all a new SRAM chain according to the installation l instructions Use a 2 5 mm hex to adjust the location of the a chain guide if necessary Make sure the chain guide does not interfere with the chain when the rear suspension is fully compressed wu ue m A 14 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual USE MAINTENANCE HAMMERSCHMIDT USE HammerSchmidt has two front transmission gears 1 1 and l Mk Overdrive In 1 1 evervthing in the mechanism is locked and spinning together one turn of the pedals equals one revolution of the chainring This is great for tackling steep climbs In Overdrive one turn of the pedals equals approximately 1 6 revolutions of the chainring This is great for hammering big descents The shift from 1 1 to Overdrive can be made smoothly and instantly using the proprietary HammerSchmidt X 0 or X 9 trigger shifters Press the large shifter paddle to pull cable and youre in 1 1 Instantly Press the small shifter paddle to release cable and you re in Overdrive Instantly With only two shifting directions you ll never make a bad shift Remember you can shift in any circumstance no matter what your chain tension is without having to plan ahead HammerSchmidt does not depend on pedaling shift while regrouping with your crew before the next climb shift mid manual even shift while coasting or pedaling backward Shift smoothly and instantly anytime
16. cket installation tools e Adjustable torque wrench up to 54 N m 478 in Ib Grease Digital calipers FRAME COMPATIBILITY CHECK HammerSchmidt is engineered to mount to frames with ISCG 03 or ISCG 05 chain guide mounting tabs and 68 73 or 83 mm bottom bracket shell widths However not all frames are made to the precision standards HammerSchmidt requires Therefore before installing you will need to perform a simple frame compatibility check to determine if you can use HammerSchmidt on your frame It is critical to perform this check otherwise you will experience complications with installation and or function To check compatibility use the enclosed HammerSchmidt frame compatibility checker tool First remove your old crank arms and bottom bracket from your frame if applicable Next thread the cup checker into the drive side bottom bracket shell Finally slide the pin checker over the cup checker and insert the pins into the ISCG tabs The pin checker is double sided one side has ISCG 03 pins the other ISCG 05 pins Be sure to insert the appropriate pins into the ISCG holes For compatibility the pins must go into the ISCG holes the cup checker must be centered in the pin checker and the arrow on the pin checker should point toward the rear wheel axle If the tool is difficult to insert won t fit at all or the arrow doesn t point toward the rear wheel axle you cannot use HammerSchmidt on your frame If you need additional help
17. ent time to do it Locate the retaining ring on the HammerSchmidt mechanism crank arm and use a flathead screwdriver to gently pry the retaining ring off the ring guide Remove the ring guide and chainring Install your other chainring Re install the ring guide and carefully press on the retaining ring using the flathead screwdriver Make sure the retaining ring is fully seated in the groove of the ring guide by rotating it a couple of revolutions INSTALLATION 6 Check that the seal disk for your frame s ISCG standard ISCG 03 or ISCG 05 is installed If you need to change out the seal disk use a 4 mm hex to remove the cable anchor bolt and a 2 mm hex to remove the seal disk retaining bolt then switch seal disks Make sure the recess on the seal disk anchor bolt window faces down Re install the cable anchor bolt until it is hand tight Re install the seal disk retaining bolt and torque to 0 5 N m 4 in Ib GEN 0000000000882 Rev A p 34 41 N m 301 363 in Ib A INSTALLATION 7 ING collar assembly must sit flush with the bottom bracket shell face or spacer for 68 mm bottom brackets So now you need to determine if you need to add ISCG tab spacers If your frame s ISCG tabs are flush with the bottom bracket shell face you do not need to add any spacers If your frame s ISCG tabs are offset inboard of the bottom bracket shell face you will need to add the sa
18. every time Your days of front shifting as you know it are over HammerSchmidt HAMMERSCHMIDT MAINTENANCE Use only water and a mild soap to clean the HammerSchmidt unit Do NOT use a pressure washer This will damage the seals and allow dirt debris to contaminate and potentially damage the internals of the HammerSchmidt unit Periodically inspect all of the bolts of the HammerSchmidt unit and crank arms for proper torque See the service interval schedule at Technical Service You should have a professional bicycle mechanic periodically disassemble your HammerSchmidt unit to inspect the internals for signs of wear or damage and to re lubricate the mechanism Always inspect components for damage after any crash GEN 0000000000882 Rev A 15 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual TECHNICAL SERVICE TABLE OF CONTENTS EXPLODED VIEW OF HAMMERSCHMIDT MECHANISM HAMMERSCHMIDT BEARING REMOVAL TOOL SERVICE INTERVAL SCHEDULE TROUBLESHOOTING MECHANISM ASSEMBLY AND DRIVE SIDE CRANK ARM SERVICE COLLAR PLATE ASSEMBLY SERVICE GEN 0000000000882 Rev A 18 18 19 20 22 34 TECHNICAL SERVICE Ud 3 Planet Nuts 4 Crank Arm 5 Carrier Seal 6 Planet posts 7 Carrier Assembly 8 Planets 9 Planet Retaining Rings 10 Sun Gear 11 Ring Spacer 12 Damper 13 Bearing Assembly 14 Bearing Seal 15 Sun Retainer 16 Chainring 17 Guide Ring 18 Retaining Ring for Guide Ring
19. from the front of the collar assembly slide the anchor bolt so the pawls are retracted and re install the rubber seal lip side down Make sure it is fully seated and check again that the pawls can extend and retract without interference HAMMERSCHMIDT SHIFTER INSTALLATION Install your HammerSchmidt shifter onto your handlebar in a position that is right for you Use a 5 mm hex to tighten the shifter clamp bolt and torque to 2 5 4 N m 22 35 in Ib Turn the shifter adjuster barrel clockwise until it stops then turn the adjuster barrel counter clockwise one full turn Measure the amount of cable housing you will need to route the housing from the shifter into the cable stop on the collar assembly Cut the housing with the cable cutters Remember measure twice cut once Feed the cable through the cable housing and route the housing from the shifter into the cable stop Make sure the housing has a slight bend as it reaches the collar assembly and fits easily into the cable stop Press the small shifter paddle to ensure the cable is fully released Loosen the cable anchor bolt pull the shifter cable taut and attach it to the actuator making sure the cable is sitting in the groove of the anchor bolt Keeping the shifter cable pulled taught use a 4 mm hex to tighten the anchor bolt to 2 2 N m 20 in Ib Cut the cable a couple centimeters past the anchor bolt and install a cable tip Slowly turn the HammerSchmidt shifter barre
20. he four bash guard nuts Remove the bash guard GEN 0000000000882 Rev A 23 TECHNICAL SERVICE CRANK ARM REMOVAL 5 Using a 5 mm hex wrench loosen and remove the four planet nuts Lift and remove the crank arm HAMMERSCHMIDT MECHANISM DISASSEMBLY 6 Clamp the bearing removal tool base into a vice Place the HammerSchmidt mechanism assembly on the tool base so the tool pins engage the recesses on the HammerSchmidt mechanism Place the tool clamp over the planet posts Using 5 mm hex wrench secure the clamp to the HammerSchmidt with the planet nuts Torque to 5 6 N m 50 in Ib EJ Using a 5 mm hex wrench install the shoulder screw Torque hand tight 24 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual TECHNICAL SERVICE EJ HammerSchmidt mechanism assembly is left hand threaded Use a 24 mm wrench and turn the clamp clockwise until the mechanism breaks free It could take significant force to open the system I Using a 5 mm hex wrench remove the shoulder screw and the planet nuts Remove the clamp tool Planet Removal HammerSchmidt planet retaining rings are not reusable Do not continue disassembly without new rings to reassemble the HammerSchmidt 11 On the carrier assembly find the planet retaining rings You may need to wipe away some grease to reveal the rings Use a small flathead screwdriver and a pick or tweezers remove the ring by prying the two exposed ends of the ring outwa
21. ject to change at any time without prior notice For the latest technical information please visit our website at www sram com Your product s appearance may differ from the pictures diagrams contained in this catalog Product names used in this document may be trademarks or registered trademarks of others 2 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual NOTE The information at the beginning of this document is pulled from the user manual Some of the user manual information will be referenced in the technical service section INSTALLATION 5 USE MAINTENANCE 1 TECHNICAL SERVICE 17 SAFETY FIRST At SRAM LLC we care about you Please always wear your safety glasses and gloves when servicing your HammerSchmidt Protect your eyes Wear your safety glasses GEN 0000000000882 Rev A 3 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual INSTALLATION TABLE OF CONTENTS INTRODUCTION ANATOMY PARTS AND TOOLS NEEDED FRAME COMPATIBILITY CHECK COMPONENT COMPATIBILITY CHECK NON COMPATIBILITY FRAME PREPARATION INSTALL HAMMERSCHMIDT BOTTOM BRACKET CHAINRING REPLACEMENT OPTIONAL COLLAR PLATE ASSEMBLY INSTALLATION HAMMERSCHMIDT SHIFTER INSTALLATION DRIVE MECHANISM AND CRANK ARM INSTALLATION NON DRIVE SIDE CRANK ARM INSTALLATION HAMMERSCHMIDT USE HAMMERSCHMIDT MAINTENANCE GEN 0000000000882 Rev A 10 11 11 13 14 14 15 15 INSTALLATIO
22. l adjuster counter clockwise until you see the anchor bolt move slightly to take up any cable slack There should be a small gap between the anchor bolt and the edge of the seal disk window GEN 0000000000882 Rev A 13 INSTALLATION DRIVE MECHANISM AND CRANK ARM INSTALLATION 11 Press the large shifter paddle to pull the actuator and retract 11 the pawls on the collar assembly Apply grease to the drive side bottom bracket splines and crank bolt threads Use an 8 mm hex to install the drive side crank arm assembly making sure the spindle splines engage with the bottom bracket Tighten the crank bolt until it stops and torque to 48 54 N m 425 478 in Ib U 48 54 N m 425 478 in Ib NON DRIVE SIDE CRANK ARM INSTALLATION crank bolt threads Align the non drive side crank arm to be 180 opposite the drive side crank arm Use an 8 mm hex to Apply grease to the non drive side bottom bracket splines and C Ly O install the non drive side crank arm making sure the spindle 7 in P P a splines engage with the bottom bracket Tighten the crank bolt 6 until it stops and torque to 48 54 N m 425 478 in Ib Check that N 1 p the crank arm contacts non drive side crank stop no gap If it O doesn t you will need to remove the crank arm apply B fax S additional grease and re install 48 54 N m 425 478 in Ib Soa y INSTALL CHAIN AND ADJUST CHAIN GUIDE Size and inst
23. lebar and any suspension linkage movement Clean and lubricate or replace housings If necessary Cable end pinched between collar Check to confirm that the excess cable beyond the cable anchor bolt is plate and frame or ISCG spacers trimmed to the correct length and allowed to move freely If not remove cable from pinch point ISCG tabs are not perpendicular to Use SRAM ISCG cutting tool and face ISCG tabs perpendicular to BB the BB axis axis ISCG tabs do not meet Confirm frame compatibility with the HammerSchmidt ISCG tab gages HammerSchmidt dimensional Frames with ISCG tabs that do not meet the gage criteria are not guidelines recommended for use with HammerSchmidt Loose collar plate Tighten collar plate bolts to proper torque value Broken overdrive spring Replace overdrive spring Contamination on OverDrive Clean and lubricate overdrive pawls pawis Contamination inside actuator Clean and lubricate actuator assembly internals assembly Contamination in mechanism Disassemble inspect clean and lubricate mechanism assembly assembly Wear or damage in mechanism Disassemble mechanism assembly and examine gear teeth and pawls assembly for wear or damage Unusual Noises Loose collar plate Tighten collar plate bolts to proper torque value Creaking Loose crank bolts Tighten crank bolts to proper torque value GRIND Loose bash guard nut Tighten bash guard nuts t t Grumbling oose bash guard nuts ighten bash guard nuts to
24. m 1 mm and 2 mm width spacers each marked with its width For 68 mm width bottom brackets do not exceed 0 5 mm of cutter tool spacing For 73 mm gt lt Offset and 83 mm width bottom brackets do exceed 3 0 mm of cutter tool spacing C gt OFFSET mm ISCG CUTTER SPACER S REQUIRED 0 0 None 0 1 0 5 0 5 mm 0 6 1 0 1 0 mm 1 1 1 5 1 5 mm 1 6 2 0 2 0 mm 2 1 2 5 2 5 mm 2 6 3 0 3 0 mm write this number down you will need it again later on T maximum spacer value for 73 and 83 mm bottom brackets Step 4 Face the ISCG tabs using the same method provided by the manufacturer of your bottom bracket facing tool If the cutter does not completely face the surface of each tab add a 0 5 mm spacer to the cutter tool and face again Remember do not exceed 3 0 mm of spacers When you are finished facing be sure the ISCG tab surface is smooth and free from burrs and debris For 73 and 83 mm bottom brackets do not exceed 3 0 mm of spacers during facing If you exceed 3 0 mm of spacers the resulting offset will be too large and the custom HammerSchmidt mounting bolts will not have enough thread engagement with ISCG tabs to safely mount HammerSchmidt GEN 0000000000882 Rev A d INSTALLATION INSTALL HAMMERSCHMIDT BOTTOM BRACKET dT If you have a 68 mm bottom bracket shell separate the two parts of the bottom bracket and install the included bottom spacer bracket space
25. me amount of spacers you used when facing the ISCG tabs in the Frame Preparation section in order to make the surface flush you wrote this down remember Locate the ISCG specific spacer s you need 68 mm bottom bracket users You must add an additional 2 5 mm of spacer thickness to the ISCG spacers you needed above This will complete the spacing requirements necessary for HammerSchmidt EJ Remove the rubber seal from the front of the collar assembly if necessary to fully access the mounting holes Place the ISCG spacer s onto the back of the collar assembly and align all of the mounting holes Insert the three mounting bolts through the collar assembly and ISCG spacer s to hold everything together Carefully slide the complete assembly over the drive side spindle Align the mounting bolts to the mating ISCG tabs and hand start each bolt Gently push the assembly on so it sits flat against the ISCG tabs Use a 4 mm hex to tighten all three mounting bolts in an alternating fashion Torque each bolt to 4 5 N m 40 in Ib 12 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual INSTALLATION EJ can check for proper collar assembly installation by sliding the anchor bolt on the collar assembly back and forth in the seal disk window You should see the pawls in the collar assembly extend to catch and retract to release there should be no binding of the actuator If you removed the rubber seal
26. mmerSchmidt it is time to make sure the face of the bottom bracket shell and ISCG mounting surfaces are parallel and uniform This is a critical process because one part of the HammerSchmidt mechanism is located off the bottom bracket shell while the other part is located off the ISCG tabs When they are mated together the HammerSchmidt internals need to be aligned so they can engage and function properly Let s get started Make sure your frame s bottom bracket shell threads are clean and undamaged there should be no paint or dirt in there For best results have your bottom bracket shell tapped by a professional bicycle mechanic Step 1 y E Measure your bottom bracket shell width with a pair of digital calipers The shell width should be either 68 73 or 83 mm 40 3 0 2 mm Step 2 Face the bottom bracket shell This will create a flat surface for ISCG cutter to bottom out on in the next step Keep in mind the tolerances as you face the bottom bracket shell If the shell width exceeds the maximum tolerance value 40 3 mm you will need to face it within specification However do not face shorter than the minimum tolerance value allows 0 2 mm Follow the instructions XN provided bv the manufacturer of vour bottom bracket facing tool for proper operation of the tool a 68 73 or 83 mm J 8 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual INSTALLATION FRAME PREPAR
27. move the seal disk Wiper Seal Removal 11 With the seal disk removed the wiper seal can removed 36 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual TECHNICAL SERVICE Actuator Removal Be sure to wear your safety glasses for this step The actuator spring is pre loaded and may pop out suddenly Remove the actuator spring by pinching the curved tips together and lifting the spring out of the assembly Remove the actuator Crank Stop Removal Locate the beveled edge of the crank stop retainer Using a pick start at the beveled edge to lift the crank stop retainer from its groove GEN 0000000000882 Rev A 37 TECHNICAL SERVICE CLEAN COLLAR PLATE ASSEMBLY Thoroughly clean any contamination and grease from the components of the collar plate assembly Ensure that any grease residue Is removed from the pawls pawl seats actuator and the actuator recess in the collar plate and ensure these components are dry prior to applying fresh grease GREASE AND REASSEMBLE COLLAR PLATE Use only the grease provided in the HammerSchmidt grease kit inside the collar plate assembly Poor performance and accelerated wear can be expected from use of other lubricants Crank Stop Reassembly Insert the crank stop and secure it in place with the crank stop retainer Make sure that the retaining ring is fully seated in the groove of the crank stop Actuator Reassembly
28. nsmission gears e Foam rings e Shifter and brake cables inner e Tools e Rear shock mounting hardware and outer and main seals e Handlebar grips e Upper tubes stanchions e Shifter grips e Stripped threads bolts e Jockey wheels aluminium titanium magnesium e Disc brake rotors or steel e Wheel braking surfaces This warranty shall not cover damages caused by the use of parts of different manufacturers This warranty shall not cover damages caused by the use of parts that are not compatible suitable and or authorised by SRAM for use with SRAM components This warranty shall not cover damages resulting from commercial rental use TRUVATIV HAMMERSCHMIDT SERVICE We recommend that you have your Truvativ HammerSchmidt serviced by a qualified bicycle mechanic Servicing the HammerSchmidt requires knowledge of planetary gear systems as well as the special tools used for service We recommend that you have your Truvativ HammerSchmidt serviced by a qualified bicycle mechanic Servicing the HammerSchmidt requires advanced mechanical skill knowledge of planetary gear systems as well as access to and knowledge of use of the special tools required for service Copyright O SRAM 2009 LLC For exploded diagram and part number information please referto the Spare Parts Catalog available on our website at www sram com For order information please contact your local SRAM distributor or dealer Information contained in this publication is sub
29. over stretching or kinking it If the spring is damaged upon installation replace it with a new one Make sure that the spring Is fully seated in the groove of the collar plate and the pawls Collar Seal Reassembly Pull the actuator arm so the pawls are retracted and re install the collar seal lip side down Make sure it is fully seated and check again that the pawls can extend and retract without interference Chain Guide Reassembly If the chain guide was removed due to damage install a new chain guide onto the collar plate in the same location as before the service Using a 2 5 mm hex wrench install the two chain guide screws Torque to 0 7 N m 6 in Ib REASSEMBLE THE COLLAR PLATE ASSEMBLY For reassembly of the collar plate assembly follow the instructions as shown under headings Collar Plate Assembly Installation in the Installation section of this manual For installation of the shifter cable and shifter adjustment follow the instructions as shown under headings HammerSchmidt Shifter Installation in the Installation section of this manual GEN 0000000000882 Rev A SAFETY CHECK ah Before setting out on a ride perform a parking lot test to ensure the HammerSchmidt shifts and functions properly This concludes the Collar Plate Assembly Service for your HammerSchmidt You did a great job 41 vvorid headquarters SRAM LLC 1333 n kingsbury st 4th fl chicago il 6062
30. proper torque value Buzzing Loose planet nuts Remove bash guard nuts and bash guard Tighten planet nuts to proper Chain rub torque value Replace bash guard and tighten bash guard nuts to proper torque value Worn or loose chainring Inspect chainring and chainring retainer Replace if necessary Worn damper or ring spacer Disassemble mechanism assembly inspect and replace as appropriate Contamination in mechanism Disassemble inspect clean and lubricate mechanism assembly assembly Incorrect chain guide position Adjust chain guide as necessary Wear or damage in mechanism Disassemble mechanism assembly and examine gear teeth and pawls assembly for wear or damage GEN 0000000000882 Rev A 2 TECHNICAL SERVICE MECHANISM ASSEMBLY AND DRIVE SIDE CRANK ARM SERVICE O Always wear your safety glasses and gloves when servicing the HammerSchmidt Some parts of the HammerSchmidt are spring loaded and can pop out suddenly which could lead to injury if your eyes are not properly protected Make sure you have a clean work area clean rags and the necessary parts and tools to service your HammerSchmidt When performing service on your HammerSchmidt the following parts are not re usable and must be replaced during service Planet Retaining Rings and Carrier Seal Parts and tools needed for service e Safety glasses e Pick e Gloves e Clean rags e HammerSchmidt Bearing Removal Tool e Adjustable torque wrench up to
31. rd Repeat until all four rings have been removed Discard the used rings Lift and remove the planets Sun Gear Removal Using a small flathead screwdriver gently pry the retainer ring off the sun Separate the sun and bearing assembly GEN 0000000000882 Rev A 25 TECHNICAL SERVICE Bearing Seal Removal Use a small flathead screwdriver to remove the bearing seal by gently prying upward from the inner edge of the seal Perform this step carefully to avoid bending or damaging the seal If the seal is damaged during removal it should be replaced to avoid creating increased drag and poor sealing performance Ring Spacer and Damper Removal It is not necessary to remove the ring spacer and damper to service the HammerSchmidt mechanism assembly These parts should only be removed for damper replacement to avoid damage from removal Use a pick and pry upward to lift out the ring spacer 15 Use a pick to carefully pry the damper from the ring gear The damper is tightly fitted into a groove on the ring gear and may require firm pressure to position the pick for prying 26 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual TECHNICAL SERVICE CLEAN MECHANISM ASSEMBLY Thoroughly clean any contamination and grease from the components of the mechanism assembly Ensure that any grease residue is removed from the pawls pawl seats gear
32. ring gear by rotating it a couple of revolutions CRANK ARM INSTALLATION Clean and lightly grease the carrier seal on the crank arm ET reinstall the crank arm place arm over the planet posts Insert the planet nuts and use 5 mm hex torque wrench to torque to 5 6 N m 50 in Ib 32 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual TECHNICAL SERVICE BASH GUARD INSTALLATION 41 replace the bash guard place it over the planet nuts Using a 5 mm hex wrench tighten the bash guard bolts Torque to 4 5 N m 40 in Ib REASSEMBLE THE MECHANISM ASSEMBLY AND DRIVE SIDE CRANK ARM For reassembly of the mechanism assembly and drive side crank arm follow the instructions as shown under headings Drive Mechanism and Crank Arm Installation in the Installation section of this manual This concludes the Mechanism Assembly and Drive Side Crank Arm Service for your HammerSchmidt You did a great job GEN 0000000000882 Rev A 33 TECHNICAL SERVICE COLLAR PLATE ASSEMBLY SERVICE Parts and tools needed for service e Safety glasses e Clean rags e HammerSchmidt grease kit e Gloves e Pick e Small grease brush optional o 2 2 5 and 4 mm hex wrenches You must use the grease supplied in the HammerSchmidt grease kit unless otherwise specified Using any other grease will void your warranty REMOVE THE COLLAR PLATE ASSEMBLY 1 Shift the HammerSchmidt into overdrive by pressing the small shifter
33. rs one over the drive side bottom bracket cup the other over the non drive side bottom bracket up This will set the bottom bracket spacing to accommodate HammerSchmidt spacer V Apply a liberal amount of grease to the bottom bracket shell threads in the frame If you havent already pull the non drive side cup off the bottom bracket and apply a small amount of grease to the cup threads Carefully separate the center shell from the drive side cup and apply a small amount of grease to the o rings on each side of the cup Insert the center shell back into the drive side cup Finally apply a small amount of grease to the drive side cup threads 10 Copyright SRAM 2009 LLC HammerSchmidt Technical Manual INSTALLATION The HammerSchmidt bottom bracket needs to be installed in a specific order E Thread the drive side bottom bracket assembly into your frame using the Truvativ ISIS or equivalent bottom bracket installation tool The drive side assembly is left hand threaded so turn it counter clockwise to install and torque to 34 41 Nm 301 363 in Ib B not pictured Install the non drive side bottom bracket assembly using the Truvativ GXP or equivalent bottom bracket installation tool The non drive side assembly is right hand threaded so turn it clockwise to install and torque to 34 41 N m 301 363 in Ib CHAINRING REPLACEMENT OPTIONAL EJ If you want to change your chainring size now is a conveni
34. to determine the compatibility of HammerSchmidt you can visit www magicmechanics com or head over to your local Truvativ dealer for assistance COMPONENT COMPATIBILITY CHECK e Bottom Bracket HammerSchmidt BB only e Front Shifter HammerSchmidt X 0 and X 9 trigger shifters only e Chainrings HammerSchmidt 22 or 24 tooth e Chains 1 x 1 7 8 and 9 speed SRAM or Shimano chains NON COMPATIBILITY Do not mount HammerSchmidt to an ISCG adapter device ISCG adapters do not provide enough structural integrity to handle the weight and loads applied by HammerSchmidt ISCG adapters are only intended as a means to mount chain guide devices to non ISCG frames make sure you keep it that way GEN 0000000000882 Rev A 1 INSTALLATION FRAME PREPARATION IMPORTANT 0000000000000 00 The following sections on Frame Preparation call for making permanent and non reversible modifications to your frame requiring advanced mechanical knowledge skills and tools We recommend these procedures only be performed by a qualified bicycle mechanic If you choose to perform these procedures yourself you should read and understand these instructions and have a working knowledge of tools required prior to starting work on your frame In addition you should wear your safety glasses until you have completed all the steps in this manual FRAME PREPARATION PART 1 Now that you have determined that the ISCG tabs on your frame are compatible with Ha
35. y local law except for the obligations specifically set forth in this warranty statement in no event shall SRAM or its third party supplies be liable for direct indirect special incidental or consequential damages LIMITATIONS OF WARRANTY This warranty does not apply to products that have been incorrectly installed and or adjusted according to the respective SRAM technical installation manual The SRAM installation manuals can be found online at www sram com www RockShox com or www avidbike com This warranty does not apply to damage to the product caused by a crash impact abuse of the product non compliance with manufacturers specifications of usage or any other circumstances in which the product has been subjected to forces or loads beyond its design This warranty does not apply when the product has been modified This warranty does not apply when the serial number or production code has been deliberately altered defaced or removed This warranty does not apply to normal wear and tear Wear and tear parts are subject to damage as a result of normal use failure to service according to SRAM recommendations and or riding or installation in conditions or applications other than recommended Wear and tear parts are identified as Dust seals Brake sleeves e Bottomout pads e Bushings Brake pads Bearings Air sealing o rings e Chains Bearing races e Glide rings e Sprockets e Pawls e Rubber moving parts Cassettes e Tra
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