HCM-3E4-50 Hydraulic Power Unit User Manual
Contents
1. HCM 3E4 50 Hydraulic Power Unit 26 Chapter 6 Ordering Information Chapter 6 Ordering Information In This Chapter To place an order request service or get more detailed information on any E H Wachs products call us at one of the following numbers ORDERING REPLACEMENT PARTS REPAIR INFORMATION U S 800 323 8185 WARRANTY INFORMATION International 847 537 8800 RETURN GOODS ADDRESS You can also visit our Web site at www ehwachs com ORDERING REPLACEMENT PARTS When ordering parts refer to the drawings and parts lists in Chapter 8 Please provide the part description and part number for all parts you are ordering REPAIR INFORMATION Please call us for an authorization number before returning any equipment for repair or factory service We will advise you of shipping and handling When you send the equip ment please include the following information Your name company name Your address Your phone number description of the problem or the work to be done E H Wachs Part No 60 MAN 08 Rev 0 0311 27 Low Clearance Split Frame Models 1824 4248 Before we perform any repair we will estimate the work and inform you of the cost and the time to complete it WARRANTY INFORMATION Enclosed with the manual is warranty card Please fill out the registration card and return to E H Wachs Retain the owner s registration record and warranty card for your information2. E H Wachs 600 Knightsbridge Parkway Lincolnshire IL 60069 www ehwachs com HCM 3E4 50 Hydraulic Power Unit User s Manual E H Wachs Company Part No 14 MAN 28 Copyright O 2011 E H Wachs All rights reserved This manual may not be reproduced in whole or in part without the written consent of E H Wachs Table of Contents Table of Contents Chapter 1 3 4 50 Hydraulic Power Unit 1 Features and Specifications er vise 0 es 1 Winns Reference ata a NER 3 Power SWIC maqa han E Ee oth gta abe 3 PIWS f ll Wiin cc atra sen e EE 3 Switch and Fusebox Wiring sakset 3 Motor VIBE see ve 4 Chapter 25 Safety yy l Z eie P we ad 5 Operator SN 5 ad tty M 5 Safety 6 Protective Equipment Requirements 7 Safety Procedures 522 Iud iare ES 7 Chapter 3 Operating 11 Hydrate Syste svada ub ua rey SAGEN PST sk SEER eo E NUR E 11 Hydraulic Fluid Requirements 2 Penh Tene 11 Tool Hose Recommendations o2 oie are rase MEP asa ex e REY ER 12 Operation 13 Pre
3. Operation Checklist Seed brede 13 starte the Power LA M EE 14 Operating the Tol a 15 Chapter 4 Maintenance 17 Hydraulic System Maintenance 0 422 9 Xe 4c RI RPG X e EORR herdet d PES 17 Motor Mamtenangezs ui S p e eq eae quu add bale ed V d anta did ig 19 Tro bl shooting 20 Chapter 5 Parts List and Assembly 23 Chapter 6 Ordering Information 27 Ordering Replacement Parts Do wed a e ar de rd n 27 Repair Informations bow Riese be heb sakte FREE Abad ARS 2j Warranty Information Sex E IA EIER OE LL ex ie dex SES 28 Return Goods Address va aan seres RI Ra EE ERU 28 E H Wachs Part No 14 MAN 28 Rev 0 0811 1 HCM 3E4 50 Hydraulic Power Unit 2 Part No 14 MAN 28 Rev 0 08 11 E H Wachs Chapter 1 HCM 3E4 50 Hydraulic Power Unit The Wachs HCM 3E4 50 hydraulic power unit is an elec tric powered unit providing 8 gpm flow at a maximum pressure of 1500 psi 30 l min at 103 bar It is available in either a standard or an explosion proof configuration The explosion proof version uses a motor and power panel designed for safe operation in explosive environments The HCM 3E4 50 is designed to operate Type
4. RETURN GOODS DDRESS Return equipment for repair to the following address E H Wachs 600 Knightsbridge Parkway Lincolnshire Illinois 60069 USA 28 Part No 60 MAN 08 Rev 0 0311 E H Wachs E H WACHS Superior Equipment Complete Support 600 Knightsbridge Parkway Lincolnshire IL 60069 847 537 8800 www ehwachs com
5. hydraulically powered equipment must never place themselves in a location or position that could produce an injury in the event of a hydraulic line failure either with the unit running or shut down pump or motor failure or pin hole leaks in hoses or fittings movement of machine components during normal oper ation or resulting from a component malfunction or fail ure Part No 14 28 Rev 0 0811 E H Wachs Chapter 2 Safety Operator Safety 9 Do not inspect hoses and fittings for leaks using your WARNING bare hands A pin hole leak can inject hydraulic fluid N The injection of through the skin with the potential for serious injury hydraulic fluid under the skin can 9 Avoid locating equipment in any environment for cause serious injury and which it was not designed and which may create a even result in death If an dangerous operating condition such as an explosive injection injury occurs seek atmosphere e g gas dust high heat e g molten medical treatment immedi metal furnace chemicals extreme moisture etc ately 10 Avoid bodily contact with hydraulic fluids Some hydraulic fluids may irritate or injure the eyes and skin Check with your fluid suppliers to obtain this information 11 Use only E H Wachs parts and materials when servic ing the equipment Substitute parts or materials could produce a hazardous operating condition 12 When piping your equipment use only materi
6. information on eye and face protection refer to Federal OSHA regulations 29 Code of Federal Regula tions Section 1910 133 Eye and Face Protection and American National Standards Institute ANSI Z87 1 Occu pational and Educational Eye and Face Protection Z87 1 is available from the American National Standards Institute Inc 1430 Broadway New York NY 10018 CAUTION Personal hearing protection is recom mended when operating or working near this equipment Hearing protectors are required in high noise areas 85 dBA or greater The operation of other tools and equipment in the area reflective surfaces process noises and resonant struc tures can increase the noise level in the area For additional information on hearing protection refer to Federal OSHA regulations 29 Code of Federal Regulations Section 1910 95 Occupational Noise Exposure and ANSI 512 6 Hearing Protectors Safety Procedures safety requirements listed below are those generally applicable to hydraulically powered machinery but are not intended to be an all inclusive list They are intended as guidelines only and will assist in avoiding risk of injury when followed by qualified experienced personnel These E H Wachs Part No 14 MAN 28 Rev 0 0811 HCM 3E4 50 Hydraulic Power Unit WARNING Many types of machinery have parts that may start moving as soon as the hydraulic circuit is filled and pressurized This could result in i
7. power units are prewired at the factory This page describes wiring of the HCM 3E4 50 in case you need to perform service on the unit Refer to the electrical specifications in Table 1 Power Switch The power switch is on the front of the electrical control box Turn the switch clockwise to turn the unit on Turn the switch counter clockwise to turn the unit off Plug Input Wiring The photo at the right shows the input power cable The green wire is ground The other wires black white and red are hot After connecting the cable to input power bump the motor on and off to check the direction it is rotating A label on the motor shown at right indicates the motor rotation direction If the motor is rotating the wrong direction flip any 2 of the hot power input wires to reverse the direc tion Switch and Fusebox Wiring The photos below show the wiring of the switch and fuse box Make sure fuses are 30 amps AN WARNING All electrical work should be performed by a qualified elec trician Disconnect main elec trical power to the unit before removing covers Disconnect hydraulic circuit before per forming service round green EHE Eis Motor should turn clockwise E H Wachs Part No 14 28 Rev 0 0811 HCM 3E4 50 Hydraulic Power Unit To fusebox To motor Motor Wiring The motor on the HCM 3E4 50 is prewired at the factory for high voltage 440 V operation a
8. pump fittings must be tight Approximately once each week less often in hot arid climates take small sample from the bottom of the hydraulic tank by removing the 1 2 drain plug If clear water appears drain tank until clean oil is flowing If fluid is milky allow it to set tle for about 48 hours before draining Check hydraulic fittings and lines Check for leaks loose fittings etc throughout the entire hydraulic cir cuit Change the hydraulic filter To keep contaminants out of the hydraulic fluid and extend filter life always connect the hose ends together when the tool is disconnected and wipe off the connectors each time before connecting them 4 Filthe hydraulic tank Remove the filter cap at the top center of the tank to fill it The tank is full when oil appears in the perfo rated basket at the bottom of the filler pipe Table 1 Hydraulic Maintenance Schedule Service Item Service Interval Check fluid level Each use or 8 hours Check oil and filter Every year or 300 hours Remove condensation from fluid Every 3 months or 50 hours Inspect hydraulic system for leaks Each use or 8 hours Check pump coupling replace if necessary Every 2 years Check internal hose assemblies replace if necessary Every 2 years Test hydraulic flows and pres sures service as required Every 2 years These items should be servi
9. 1 Type 2 or Type 3 open center tools FEATURES AND SPECIFICATIONS CHECK ITEMS IN BOLD 15 HP electric motor 440 V 50 Hz power requirement Enclosed hydraulic system with self contained reser voir and filtration Sound suppression lining Enclosed high capacity cooling system with shaft mounted air to oil cooler and suction fan meets or exceeds HTMA specifications Hydraulic oil level sight gauge HTMA quick disconnect couplers Cart design with collapsible handles and large diameter tires Table 1 and the following figures describe the 3E3 electric power unit E H Wachs Part No 14 MAN 28 Rev 0 0811 HCM 3E4 50 Hydraulic Power Unit Table 1 HCM 3E4 50 Specifications Hydraulic system Open center Frame type 2 wheel mobile unit Electrical 415 440 V 50 Hz 3 phase Fuse panel 30A Wiring 10 gauge 5 mm Motor 15 HP 440 V 3 phase Oil cooler Air to oil with independent fan Filtration 10 micron return Hydraulic oil capacity 7 0 gallons 25 6 liters Rated flow no pressure 8 gpm 30 l min Rated flow amp 1500 psi 103 bar 15 gpm 56 l min Rated relief pressure 1500 psi 103 bar Dimensions L x W x H 2 mm Weight 500 Ib 227 kg Tank return port Pressure port On off switch Figure 1 1 The photo shows the 3E4 50 electric power unit E H Wachs 2 WiRING REFERENCE Wachs hydraulic
10. Both 51 100 5 8 16 SAE100R2 10 SAEI00R8 10 100 300 30 to 90 Pressure Return 3 4 SAE100R1 12 SAE100R7 12 ES SAE100R2 10 SAE100R7 12 91012 4045 1050 15 Both 58 16 SAE100R2 10 SAE100R8 10 19 SAE100R2 10 SAE100R8 10 SAE100R2 12 SAE100R7 12 Return 3 4 Return 1 SAE100R1 16 SAE100R7 16 Return 3 4 19 SAE100R1 12 SAE100R7 12 131016 49 to 60 26 to 100 81030 Pressure 4 19 SAE100R2 12 SAE100R8 12 Return 1 25 4 SAE100R1 16 SAE100R7 16 OPERATION Pre Operation Checklist Check the oil level in the hydraulic reservoir and add oil if necessary Connect the unit according the wiring instructions in Chapter 1 Check all hydraulic hoses for damage Check all fittings and couplings to make sure they are tightly connected Make sure the front of the motor is free of leaves dirt or other debris that may inhibit cooling or create a fire hazard Check hydraulic connections as described in the follow ing figure 1 H T M A 3 8 male quick acting coupler with 1 2 NPT thread 2 H T M A 3 8 female quick acting coupler with 1 2 NPT thread At the tool this may be H T M A 3 8 female quick acting coupler with 3 8 NPT thread 3 H T M A 3 8 quick acting coupler with 1 2 NPT E H Wachs Part No 14 MAN 28 Rev 0 0811 13 HCM 3E4 50 Hydraulic Power Unit thread 4 3 8 male quick acting coupler with 1 2 NPT thread At the tool this may be H
11. T M A 3 8 male quick acting coupler with 3 8 NPT thread A Refer to Table 3 for hose recommendations B Use adapters with threads that match the tool con nectors For single circuit flow up to 18 use 3 4 to 1 2 pipe For combined flow use 3 4 pipe steel hex nipple 2 required Figure 3 1 The diagram illustrates the hydraulic connectors Starting the Power Unit 1 sure the flow control circuit is set at 0 or off 2 Make sure the tool is off or deactivated 3 Connect the hydraulic hoses to the couplers on the power unit 4 Connect the hydraulic hoses to the couplers on the tool 14 Part No 14 MAN 28 Rev 0 08 11 E H Wachs Chapter 3 Operating Instructions Operation 5 Plug the power unit into the power source 6 Turn the motor switch ON 7 Allow the power unit to run without activating the tool until the hydraulic circuit warms up Operating the Tool 1 With the power unit running turn the hydraulic circuit to the ON position or turn the flow setting control to enable flow 2 To pause or shut off the tool return the circuit control to the OFF position or set the flow control to 0 3 When finished turn the power unit switch to the OFF position E H Wachs Part No 14 MAN 28 Rev 0 0811 15 HCM 3E4 50 Hydraulic Power Unit 16 Part No 14 MAN 28 Rev 0 0811 E H Wachs Chapter 4 Maintenance Chapter 4 Maintenance IMPORTANT Use on
12. TTER 1 8 X11 4 2 14 CLAMP 750 4 E H Wachs Part No 14 MAN 28 Rev 0 0811 23 HCM 3E4 50 Hydraulic Power Unit 15 NUT 5 16nc 6 16 WASHER 1 4 FLAT PLATED 12 17 HOSE 16 X 5 5 1 18 VALVE RELIEF 1 19 WASHER LOCK 5 16 6 20 WASHER FLAT 5 16 2 21 COOLER 1 22 BOLT 1 4nc X 4 23 FITTING 44501 1212 3 24 WASHER LOCK 1 2 4 25 NUT 1 2 4 26 FITTING 2047 8 8S 1 27 WASHER LOCK 10 32 BOLT 4 28 BOLT 1 4nc X 3 4 SOCKET HEAD 4 29 GAUGE SIGHT 1 30 BOLT 3 8nc X 1 2 31 BOLT 1 2nc X 2 4 32 HOSE RETURN 12 X 40 1 33 CLAMP HOSE 5 34 MANIF OLD 1 35 FITTING 20350 12 8 1 36 BOLT 5 16nc X 3 4 6 37 BOLT 1 4ncX 1 4 38 FOOT 2 39 BOLT 1 4ncX1 SK HD CAP SCREW 3 40 FITTING 4604 16 12 1 41 GRIP HANDLE 2 42 SPACER COOLER 4 43 COUPLER HYDRAULIC FEMALE 1 44 COUPLER HYDRAULIC MALE 1 45 FAN 1 46 HOSE PRESSURE 1 E H Wachs 24 47 SUPPORT PUMP 1 48 GRAPHIC SET E 10 PortaCo 1 49 PIN SPRING 2 50 HANDLE 2 51 HOSE RETURN 1 52 VALVE CONTROL 1 53 WHEEL 14 2 54 PUMP HYDRAULIC 1 55 TANK FRAME 1 56 GUARD FAN LOWER 1 57 GUARD FAN UPPER 1 58 GRILL 1 59 COUPLER PUMP 1 60 AXLE 1 61 SPACER WHEEL 2 62 MOUNT HANDLE 2 63 MOTOR ELECTRIC 15 HP 1 64 CAP FILLER 1 65 WASHER LOCK 1 4 38 E H Wachs Part No 14 MAN 28 Rev 0 08 11 25 E H Wachs
13. als of adequate size and strength to suit the flows and pres sures of the system Consider all safety factors when selecting the strength of materials to allow for shock and over pressure conditions which could occur E H Wachs Part No 14 MAN 28 Rev 0 0811 9 HCM 3E4 50 Hydraulic Power Unit 10 Part No 14 MAN 28 Rev 0 081 1 E H Wachs Chapter 3 Operating Instructions Chapter 3 Operating Instructions In This Chapter HYDRAULIC SYSTEM HYDRAULIC SYSTEM The hydraulic system consists of a hydraulic fluid reservoir filter assembly single pump and flow controls The filter is a spin on element for easy replacement The filter housing has a pressure bypass valve to divert fluid directly to the tank in the event of a restricted filter OPERATION Refer to the specifications table in Chapter 1 for capabili ties of the hydraulic system and pump Pressure hoses from the pump are connected directly to a control module which contains a relief valve a flow con trol valve and pressure and return ports Optional control modules may contain additional valves and ports Hydraulic Fluid Requirements The power unit is shipped from the factory empty Oils meeting the specifications listed below will provide all sea son operation if normal maintenance is performed The following fluids are recommended by E H Wachs These fluids work well over a wide temperature range at start up allow moisture to sett
14. ates a personal injury hazard E H Wachs Part No 14 MAN 28 Rev 0 0811 HCM 3E4 50 Hydraulic Power Unit Always turn machine off before doing any adjustments or service SECURE LOOSE CLOTHING AND JEWELRY Secure or remove loose fitting clothing and jewelry and securely bind long hair to prevent them from getting caught in moving parts of the machine KEEP WORK AREA CLEAR Keep all clutter and nonessential materials out of the work area Only people directly involved with the work being performed should have access to the area Safety Symbols A This icon is displayed with any safety alert that indicates a personal injury hazard N WARNING This safety alert indicates potentially hazardous situation that if not avoided could result in death or serious injury Z CAUTION This safety alert with the personal injury hazard symbol indicates a potentially hazardous situation that if not avoided could result in minor or moderate injury NOTICE This alert indicates a situation that 1f not avoided will result in damage to the equipment Part No 14 28 Rev 0 0811 E H Wachs Chapter 2 Safety Operator Safety IMPORTANT This alert indicates a situation that if not avoided may result in damage to the equipment Protective Equipment Requirements WARNING Always wear impact resistant eye pro tection while operating or working near this equipment For additional
15. ced by a qualified hydraulics technician 18 Part No 14 MAN 28 Rev 0 0811 E H Wachs Chapter 4 Maintenance Motor Maintenance MAINTENANCE The sealed motor bearings are pre greased at the factory for normal bearing life 1 On motors supplied with grease fitting apply grease with grease gun according to the schedule in Table 2 at the end of this section On 215 and smaller frames use 1 to 2 full strokes of the grease gun On NEMA 254 through NEMA 365 frames use 2 to 3 strokes On NEMA 404 and larger frames use 3 to 4 strokes 2 On motors with drain plugs remove the grease drain plug and run the motor for 20 minutes Replace the drain plug 3 On motors equipped with slotted head grease screws remove the screw and apply grease tube to the hole On NEMA 215 and smaller frames insert a 2 to 3 inch length grease string On NEMA 254 and larger frames insert a 3 to 5 inch length grease string Table 2 Motor Maintenance Schedule Relube Interval Usage Level 4210215T 254t0326T 36410447 Frame Frame Frame 5000 hours 5 years 3 years 1 year Continu us noral 2 years 1 year 9 months application Seasonal service motor 1 year is idle for 6 months or beginning 1 year 1 year more of season Continuous in wet or dirty 6 months environment E H Wachs Part No 14 MAN 28 Rev 0 08 11 19 HCM 3E4 50 Hydrau
16. genuine E H Wachs parts or equiv In This Chapter alent Using replacement parts that are not of equivalent HYDRAULIC SYSTEM quality may damage the hydraulic power unit MAINTENANCE MOTOR MAINTENANCE TROUBLESHOOTING HYDRAULIC SYSTEM MAINTENANCE Observe the following for maximum performance and ser vice life from the hydraulic system See Table 1 at the end of this section for maintenance intervals Use the correct hydraulic fluid at all times Keep the hydraulic system and fluids clean at all times Keep water out of the fluid Keep air out of the lines Air is indicated by the hydrau lic system overheating and foam at the hydraulic tank breather Tighten all suction line fittings and clamps Hydraulic system wear is indicated by increased heat during tool operation reduced tool performance and eventual system breakdown Remove condensed moisture from the hydraulic fluid Condensation is a frequent problem with cool mobile hydraulic circuits This condition occurs in moist or cold climates when warm air in the reser voir tank draws moisture from the cooler outside air Water will then accumulate in the tank Check the suction hose from the hydraulic tank to the pump inlet to make sure it is not kinked and that E H Wachs Part No 14 MAN 28 Rev 0 0811 17 HCM 3E4 50 Hydraulic Power Unit the clamps are secure This will reduce the risk of pump cavitation and sucking air into the system All
17. le out and resist biological growth likely in cool operating hydraulic circuits Other fluids that meet or exceed their specifications may also be used E H Wachs Part No 14 MAN 28 Rev 0 0811 11 HCM 3E4 50 Hydraulic Power Unit Mobil DTE 24 Mobil SCH 524 Mobil DTE 10 Excel 32 Shell Tellus T 32 Texaco Rando Table 1 Viscosity Temperature Viscosity 50 F 10 C 450 SSU max 95 centistrokes C S 100 F 38 C 130 220 SSU 27 42 C S 140 F 60 C 85 SSU min 16 5 C S min Table 2 Hydraulic Fluid Properties Property Specification Pour point 10 F 23 C min for cold startup Viscosity index ASTM D 2220 140 min Demulsibility ASTM D 1401 30 minutes max Flash point ASTM D 92 340 F 171 C min Rust inhibition ASTM D 665 A amp B Pass Oxidation ASTM D 943 1000 hours min Pump wear test ASTM D 2882 60 mg max Tool Hose Recommendations The following table lists recommended hydraulic hoses for a variety of applications 12 Part No 14 MAN 28 Rev 0 081 1 E H Wachs Chapter 3 Operating Instructions Operation Table 3 Hydraulic Hose Recommendations FLOW PER LENGTH INSIDE SAE SPEC SAE SPEC CIRCUIT EACH HOSE DIAMETER WIRE BRAID FIBER BRAID om sos 12 1 smerooris SAE10087 5108 51 100
18. lic Power Unit TROUBLESHOOTING Table 3 Power Unit Troubleshooting Problem Cause Remedy Line trouble such as single Check power source for overloads fuses Motor will not start phasing at the starter controls etc Excessive humming High voltage Check input line connection Locate and remove source of excessive Overload Compare actual amps friction in motor or load measured with nameplate rat Reduce load or replace motor with one of ings greater capacity Check current at all phases should be Single phasing approximately equal and correct problem when isolated Check external cooling fan to be sure air is moving properly Improper ventilation Check motor for dirt build up and clean motor Check voltage at all phases should be Unbalanced voltage approximately equal and correct problem Motor overheating when isolated Check air gap clearance and bearings Rotor rubbing on stator Tighten through bolts Check input voltage at each phase to Over voltage or under voltage motor Check stator resistance at all three Open stator winding phases for balance Perform dialectric test and repair as Grounded wiring required Inspect all electric connections for proper termination clearance mechanical Improper connections strength and electrical continuity Refer to motor lead connection diagram on motor plate Remove grease
19. njury to personnel or dam age to machinery WARNING Make sure all per AN sonnel are clear from the machin ery being operated before shutting down the HPU precautions should be included in the comprehensive safety program for the particular machinery equipment plant or process and overseen by personnel capable of analyzing any hazards associated with operating and maintaining the equipment 1 Return all movable parts of the machinery being oper ated to their normal startup condition if possible before starting unit 2 Be sure all personnel product etc are clear of machinery before starting hydraulic unit 3 Check to make sure any hydraulic connections which may have been removed replaced or disconnected during shut down have been reconnected securely before starting hydraulic unit 4 Before starting the unit perform all equipment checks described at the beginning of the operating instruc tions 5 are tools or machinery being operated by the HPU that may move when hydraulic flow or pressure are turned off or turned on block or lock these parts in position before shutting down the hydraulic unit 6 Shutdown the hydraulic unit and relieve pressure from all pressurized accumulators actuators and lines before removing tearing down or performing mainte nance on any remotely located actuators hoses fil ters valves piping etc 7 personnel observing or working on or adjacent to
20. s shown on the wiring connection label on the motor No other service is required Voltage of units in the field cannot be changed with the sup plied components Contact factory service at E H Wachs if this is required Part No 14 MAN 28 Rev 0 08 11 E H Wachs Chapter 2 Safety Chapter 2 Safety E H Wachs takes great pride in designing and manufactur ing safe high quality products We make user safety a top priority in the design of all our products Read this chapter carefully before operating the hydraulic power unit It contains important safety instructions and recommendations OPERATOR SAFETY Follow these guidelines for safe operation of the equip ment READ THE OPERATING MANUAL Make sure you understand all setup and operating instructions before you begin INSPECT MACHINE AND ACCESSORIES Before starting the machine look for loose bolts or nuts leaking lubricant rusted components and any other physical conditions that may affect operation Properly maintaining the machine can greatly decrease the chances for injury ALWAYS READ PLACARDS AND LABELS Make sure all placards labels and stickers are clearly legible and in good condition You can purchase replacement labels from E H Wachs Company KEEP CLEAR OF MOVING PARTS Keep hands arms and fingers clear of all rotating or moving parts In This Chapter OPERATOR SAFETY Look for this sym AN bol throughout the manual lt indic
21. t and from tool return or out port to lower port both ports on same side of the mani fold Relief valve s stuck open Adjust or replace valve s Tool is defective Repair as necessary Tool runs too hot Hoses too small Improper fluid Increase hose diameter Refer to hose specification table in Chapter 3 Replace fluid Cooler clogged blocked air flow Clean cooler and straighten fins as neces sary Hydraulic pump damaged Replace pump Flow control valves or priority valves have been added to cir cuit Some rotary tools must have flow controls Adjust flow to match tool gpm to avoid forcing excess flow over relief Closed center tools in use Use only open center tools E H Wachs Part No 14 MAN 28 Rev 0 0811 21 HCM 3E4 50 Hydraulic Power Unit 22 Part No 14 MAN 28 Rev 0 081 1 E H Wachs Chapter 5 Parts List and Assembly The following table lists the parts for the 3 4 50 power unit See the drawing after the list for assembly and parts identification ITEM DESCRIPTION QTY i FILTER COMPLETE 1 FILTER ELEMENT REPLACEMENT 2 NUT J AM 9 3 BOLT 1 4nc X 3 4 19 4 BOLT 1 4nc X 2 2 5 FITTING 6901 10 8 1 6 PLUG 1 2 MAGNETIC 1 7 CLAMP HOSE 2 8 NUT 3 8 nc 2 9 NUT Yanc 23 10 NUT Y NYLOCK 2 11 LOCK WASHER 3 8 2 12 FITTING 1 2 NIPPLE 5404 0808 2 13 PIN CO
22. until cavity is approxi Excessive grease in bearing mately 3 4 filled Add grease until cavity is approximately Insufficient grease in bearing 3 4 filled Bearing overheating Clean bearing cavity and bearings Dirt in bearing Repack with correct grease until cavity is approximately 3 4 filled 20 Part No 14 MAN 28 Rev 0 0811 E H Wachs Chapter 4 Maintenance Troubleshooting Table 3 Power Unit Troubleshooting Problem Cause Remedy Rubbing between rotating parts and stationary parts Isolate and eliminate cause of rubbing Vibration Rotor out of balance Have rotor balance checked or repaired Tune system or contact E H Wachs ser Resonance vice for assistance Remove rotor and foreign material Rein 5 ans stall rotor Noise oreign material in air gap or ventilation openings Check insulation integrity Clean ventilation openings Growling or whining Bad bearings Replace bearings Clean all grease from cavity and new bearing repack with cor rect grease until cavity is approximately 3 4 filled Motor runs but hydraulic circuit will not drive tools Tool not connected to power unit Connect tool Check coupler Hydraulic fluid reservoir low Check and fill as required Tool hoses blocked Remove obstruction Tool hoses incorrectly connected to circuit fittings Check that tool hose goes from top por
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