81550005Multiple Disc Brake
Contents
1. position 15 Install cover plate 5 using four socket head assembly bolts 21 SEE NOT BLOW Torque cap screws to 55 ft lb NOTE Bolts should have one or two drops of Henkel Omnifit 1550 or Loctite 609 applied to threads Form No 81 550 005 1990 01 01 FOR REPAIR KIT INFORMATION REFER TO PAGE 7 FIGURE 2 ITEM DESCRIPTION ITEM DESCRIPTION RETAINING RING ROTOR DISCS RETAINING RING STATOR DISCS BEARING SPRING PLATE OIL SEAL SPRINGS COVER PLATE PISTON CASE GASKETS BACK UP RING SPLINE SHAFT ASSEMBLY O RING SOCKET HEAD CAP SCREWS BACK UP RING ASSEMBLY BOLTS O RING SOCKET HEAD SHOULDER BOLTS PRESSURE PLATE TENSION PINS SOCKET HEAD ASSEMBLY BOLTS PRIMARY DISC ROTOR DISC THICK Form No 81 550 005 1990 01 01 5 MICO Inc BLEEDING 1 Install brake in system and connect pressure lines 2 Bleed pressure release section of brake by pressurizing side SERVICE DIAGNOSIS PROBLEM Brake slips Brake drags or runs hot Brake will not release MICO Inc CAUSE EXPLANATION A Excessive pressure in hydraulic system B Oil in brake if designed for dry use C Disc plates worn D Springs broken or have Broken or set springs can cause re taken a permanent set duced torque a rare occurrence A Low actuation pressure B Bearing failure If the bearing should fail a large amount of drag can be generated C Oil in brake A Stuck or clogged valve B Bad2. AD CAP SCREW Assembly Bolt f OIL SEAL PA BEARING ANE Mi RETAINING RING Ng ALR Ry A li b D IE a Wj BSCE SPLINE SHAFT ag K PRIMARY DISC AN il aN fossa 7A KN a COVER PLATE SOCKET HEAD EX A SHOULDER BOLT Tension Pin O RING SPRING PLATE IK BACK UP RING SPRING CASE GASKET FIGURE 1 MICO Inc 2 Form No 81 550 005 1990 01 01 PRINCIPLES OF OPERATION These brakes are spring set hydraulically released multi disc brakes They are used primarily for holding loads vehicles conveyors etc in place when the hydraulic drive system is shut down or fails Although the brakes are rated at 3000 PSI they only require from 100 PSI to 390 PSI to make them function normally The exact pres sure required for operation is dependent upon the number of springs used to generate the torque necessary to hold the designed load Thus a brake with a full com pliment of springs will generate the highest level of torque and require approximately 390 PSI to fully release the brake and provide adequate running clearance for the individual discs A brake with 1 2 of the full spring compliment will have 1 2 as much torque and will require only 200 PSI to fully release the brake Consult catalog to choose the torque which best suits your design parameters It is very important to remember that any pressure on the brake s release piston will directly effect the level of torque Two application exa
3. Modular MULTIPLE DISC BRAKE SAE D size Service Manual This document is intended to provide general information about MICO Products MICO Inc has attempted to present accurate information about MICO Products in its catalogs brochures and other printed materials MICO Inc is not responsible for errors inaccuracies or inconsistencies that may exist in any catalog brochure or other printed materials or any damages arising from or related to reliance on information in them Materials and specifications for MICO Products set forth in catalogs brochures and other printed materials are subject to change without notice or obligation Refer to www mico com for the most recent versions of our literature If you have any questions concerning MICO Products please contact MICO Inc All MICO Products and service are sold and provided subject to the MICO Warranty at www mico com in effect on the date of sale or supply MICO is a trademark and registered trademark of MICO Inc MICO is registered in the U S Patent and Trademark Office as well as in Australia Canada Indonesia Japan Peoples Republic of China South Korea and the European Community MICO MICO Incorporated 1911 Lee Boulevard North Mankato MN U S A 56003 2507 Innovative Braking and Controls Worldwide Tel 1 507 625 6426 Fax 1 507 625 3212 Form No 81 550 005 1990 01 01 www mico com TYPICAL BRAKE PISTON BACK UP RING O RING PRESSURE PLATE CASE GASKET SOCKET HE
4. mples 1 The brake has a release pres sure of 200 PSI The actuation pressure is provided by a charge pump During certain phases of the machines opera tion the charge pump pressure dips from 200 PSI to 100 PSI At 200 PSI the brake runs free zero torque but at 100 PSI the brake will generate slightly less than half of its rated torque The brake will drag failure may occur In this case a brake should be selected DESCRIPTION OF MODEL NUMBERS f k e Difa aE bik OUTPUT FACE D SAE D Mount 4 Bolt OUTPUT SPLINE 13 13T 8 16 21 21T 16 32 17 17T 12 24 INPUT SPLINE 13 13T 8 16 21 21T 16 32 17 17T 12 24 14 14T 12 24 00 Used with R Input Face only NOTE On oil cooled models Z option actual torque is 67 of value shown on torque code chart Form No 81 550 005 1990 01 01 TORQUE Code Torque which has a lower release pressure 2 Abrake has a release pressure of 200 PSI The system is set up to hold a load when a vari able pump is shifted into neu tral Everything is running fine until the filter clogs causing a build up of back pressure in the return line to the tank Ata pressure of 60 PSI the brake will lose 25 of its holding torque thus the load may slip The situation can be corrected by replacing the filter or adding an extra margin of safety to your required brake torque in the initial design These brakes are designed to give thousands of t
5. o rings If release piston will not hold pres sure brake will not release C Discs frozen inlet port and allowing air to escape from top port Pressure should not exceed 100 PSI during bleeding If there is back pressure in the actua tion line of the brake holding torque will be reduced Wet linings generate 67 of the dry torque rating If the brake has oil in it check the type of oil hydraulic or gear box 1 Gearbox oil 2 Hydraulic oil The thickness of the disc stack sets the torque level A thin stack reduces torque The brake should be pressurized to minimum of 20 PSI over the full re lease pressure under normal operat ing conditions Lower pressures will cause the brake to drag thus generat ing heat Excess fill of oil in sump condition thru wet brakes can cause the unit to run hot Also excessive rpm in sump condition Brakes are designed to come on when system pressure drops below stated release pressure If pressure cannot get to brake the brake will not release These brakes are designed for only limited dynamic braking A severe emergency stop or prolonged reduced release pressure operation my result in this type of damage 6 Form No 81 550 005 3 Apply sufficient pressure to release brake and check for proper operation in system ACTION Check filters hose size restrictions in other hydraulic components Replace oil seal in brake Check motor seal Check piston seal
6. on 15 toward spring pockets 7 Install o rings 17 amp 19 on piston 15 Be sure o rings are flat and all twists removed A CAUTION Care must be taken so as not to scratch or mar piston 8 Lubricate piston 15 with clean type fluid used in the system Carefully press piston into pressure plate 20 Be sure piston is aligned correctly at all times and that there are no extrusions Press piston until it bottoms on pressure plate 20 9 Install same number of springs 14 according to pattern and color as were removed during disassembiv Different colored springs must be alternated 10 Affix self adhesive case gas kets 6 to cover plate 5 and spring plate 13 11 Place unit on a press Using a fixture depress and install four socket head cap screws 8 SEE NOTE BELOW Torque cap screws to 55 ft lb A suitable holding fixture is useful 4 to hold brake in position 12 Install stator discs 12 and rotor discs 11 amp 22 Begin with a thick rotor disc 22 and alternate with stator discs 12 and thin rotor discs 11 Com plete with thick rotor disc 22 13 Install primary disc 10 14 Align discs and partially screw in four socket head shoulder bolts 9 SEE NOTE BELOW Inspect for free movement of stack Pressurize brake release port approx 400 PSI to re lease discs Torque shoulder bolts to 15 ft lb and release pressure A suitable holding fix ture is useful to hold brake in
7. rouble free hours of service when set up correctly in the hydraulic circuit PE Pe OPTIONS Available separately or in combination D Double Bearing S Speed Sensor Z Oil Cooled INPUT FACE D SAE D Mount C SAE C Mount R Closed Face E SAE E Mount 1PSI 0 06895 bar Initial Full Release Release Ib In Pressure Pressure PSI PSI 20 20 000 250 390 16 16 000 200 300 13 13 000 160 250 12 12 000 150 240 10 10 000 130 190 90 9000 120 180 80 8000 100 150 55 5500 80 120 MICO Inc DISASSEMBLY 1 Remove four socket head as sembly bolts 21 A suitable holding fixture is useful to keep brake in position 2 Tap female end of spline shaft assembly 7 and spring plate 13 with soft mallet to separate cover If sections will not sepa rate use a screwdriver to care fully pry sections apart 3 Remove case gasket 6 from cover plate 5 4 Remove retaining ring 1 from spline shaft assembly 7 5 Remove spline shaft assembly 7 from cover plate 5 by tap ping male end of spline shaft assembly with soft mallet 6 Remove retaining ring 2 from cover plate 5 and press out oil seal 4 and bearing 3 if re quired 7 Remove four socket head shoulder bolts 9 A suitable holding fixture is useful to hold brake in position A CAUTION Do not remove shoulder bolts without pressurization of brake approx 400 PSI or damage may result 8 Remove primary disc 10
8. s Note Internal compo nents will need to be inspected cleaned and replaced as required Check disc thickness Check release pressure See spring replacement Place pressure gauge in bleed port amp check pressure with system on Replace bearing Drain oil and refill as specified for brakes or Switch to flow thru cooling Place pressure gauge in bleed port check for adequate pressure Replace defective line or component Replace o rings Replace disc stack 1990 01 01 REPAIR KITS Form No 81 550 005 NUMBER 12 504 116 12 501 118 12 501 122 12 501 128 1990 01 01 DESCRIPTION O ring and Back up Ring Kit Lining Kit Bearing Kit Spring Kit INCLUDES Case Gaskets 6 Oil Seal 4 Back up Rings 16 amp 18 O rings 17 amp 19 Loctite Case Gaskets 6 Primary Disc 10 Stator Discs 12 Rotor Discs 11 amp 22 Loctite Case Gaskets 6 Bearing 3 Oil Seal 4 Loctite Case Gaskets 6 Springs 14 Loctite MICO Inc
9. six thin rotor discs 11 two thick rotor discs 22 and seven stator discs 12 9 Release the pressure to brake before removing four socket head cap screws 8 10 Remove spring plate 13 11 Remove case gasket 6 from spring plate 13 12 Before removing springs 14 not pattern and color for reas sembly purposes 13 Remove piston 15 by care fully exerting hydraulic pres sure to the release port in the pressure plate 20 14 Remove outside and inside o rings 17 amp 19 and outside and inside back up rings 16 amp 18 from piston 15 A CAUTION Care must be taken so as not to scratch or mar piston MICO Inc ASSEMBLY LUBRICATE ALL RUBBER COM PONENTS FROM REPAIR KIT WITH CLEAN TYPE FLUID USED IN TYPE SYSTEM 1 Clean all parts thoroughly be fore assembling 2 Press oil seal 4 into cover plate bore 5 until it is flush with bearing shoulder DRY DESIGN BRAKE oil seal 4 must be installed with open side facing pilot end of cover 5 LIQUID COOLED BRAKE oil seal 4 must be in stalled with closed side facing pilot end of cover 5 3 Press bearing 3 into position until it bottoms out on oil seal borestep 4 Install retaining ring 2 into cover plate 5 5 Press spline shaft assembly 7 into bearing 3 until shaft bot toms on shaft shoulder Bear ings inner race must be supported during this opera tion 6 Install back up rings 16 amp 18 on pist
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