Parts and Repair Information - Hydraulic Supply …

1 Eaton Medium Duty Piston PumpModel 70422 or 704520 - 38 cm3/r [0 - in3/r]DisplacementParts and RepairInformationNo. 6-631 January 1998 Model 70423 or 704530 - 45 cm3/r [0 - in3/r]DisplacementPressure or Pressure-Flow Compensated Piston Pumps2 Model 70422 or 70423 Table of ContentsIntroduction .. 2 Identification .. 3 Tools Required .. 3 Parts Drawing .. 4 Parts List .. 5 - 15 Item 1 - Drive Shaft ID .. 6item 2 - Backplate Assembly .. 7 - 8 Item 4 - Compensator Assembly and Parts List .. 9 - 10 Factory Pre-set Compensator Assemblies .. 11 Item 3 - Housing Identification .. 12 Item 5 - Rotating Kit .. 12 Mounting Kits .. 13 Product Number .. 14 - 15 Repair Information .. 16 - 18 Disassembly .. 16 Inspection .. 17 Reassembly .. 17 - 18 Start-up Procedure .. 19 Fault - Logic Troubleshooting .. 20 - 23 IntroductionThis manual provides service Information for the Eaton Models 70422 or 70423 Pressure or Pressure - FlowCompensated Piston Pumps. Step by step instructions for the complete disassembly, inspection, andreassembly of the pump are given.

2 The following recommendations should be followed to insure the pump from the is extremely the port areas thoroughly before disconnecting the Hydraulic the pump ports and cover the open Hydraulic lines immediately after they're the oil and clean the exterior of the pump before making all metal Parts in clean compressed air to dry the Parts . Do not wipe them dry with paper towels or compressed air should be filtered and moisture use new seals when reassembling Hydraulic the new rubber seals with a petroleum jelly (Vaseline) before all bolts over gasketed joints, then repeat the torquing sequence to make-up for the accuracy of pump repairs on an authorized test stand is 70422 or 70423 Identification and Tools Required 9/16 Inch Socket 1-1/8 Inch End Wrench 11/16 Inch End Wrench Rachet Wrench Torque Wrench (100 ) 3/16 Inch Hex Key (Allen) 3/16 Inch Hex Key (Allen Socket) Soft Face Hammer Internal Retaining Pliers (Straight .070 Tip) External Retaining Pliers (Straight.)

3 070 Tip) Regular or Locking Pliers Seal Driver or Similar Tool Petroleum Jelly (Such as Vaseline) 3/8 inch x 1-1/8 inch flat washer (2 ea.) 3/8 inch x 3-1/4 inch Cap screw (1 ea.) 3/8 inch NutTools RequiredIdentification Numbers - Pressure or Pressure-Flow Compensated Piston PumpStamped on each units mounting - Product Number Description70422 = Single Piston Pump70452 = Single Piston Pump, w/ Aux. Flange70423 = Single Piston Pump70453 = Single Piston Pump, w/ Aux. FlangeB - RotationL - Left Hand (CCW)R - Right Hand (CW)C - Sequential NumberingSingle Pump - Product Number:7 0 4 2 3 - R A AASerial Number Code:B 93 01 31 JBTesters InitialsDay of Month (two digits)Month (two digits)Revision level of Parts two digits of year built.( 93 for 1993 etc.)BCYear Manufactured(1 for 1991 etc.)Change CodeSerial Number Code prior to Jan., 1992:1 B- 52- JBTesters InitialsWeek of Year4 Model 70422 or 70423 PartsDrawingPump drawn below is typical of a righthand (CW) rotation (Cover only)57263-11221121020111423815242415823 1413181793-212122625216 Serial code and assembly number location3 All left (CCW) or right (CW) directionsgiven are viewed from the input shaft end of the 70422 or 70423 Parts ListItemPart 1 Drive Shaft (Identification drawing on page #6)2 1 Backplate Assembly (Identification drawing on page #7 & 8)3 1 Housing Assembly (Identification drawing on page #12)3-116238-118161 Bearing3-216026-8082 Roll Pin4 1 Compensator Assembly (Identification drawing on page #9, 10, & 11)5 1 Rotating Kit Assembly ( Parts list on page #12)670423-6051 Camplate, 0 - 38 cm3/r [0 - in3/r] Displacement670423-6101 Camplate, 0 - 45 cm3/r [0 - in3/r] Displacement770421-4011 Control Piston, 0 - 38 cm3/r [0 - in3/r] Displacement770423-4181 Control Piston, 0 - 45 cm3/r [0 - in3/r] Displacement+ 816015-272O-ring, mm Dia.

4 X mm ID. [.0937 in. Dia. x in. ID.]916026-6081 Roll Pin1016048-3191 Washer+ 1116077-321 Retaining Ring+ 1216078-182 Retaining Ring1317091-141 Spring1470412-1512 Thrust Bearing1570412-6072 Trunnion Cover+ 1670412-6261 Gasket1770420-351 Pivot Button1870420-591 Spring Collar+ 1970422-6001 Gasket+ 2016253-181 Shaft Seal2016253-2181 Shaft Seal, Drive (fluorocarbon rubber)2174308-1002 Thrust Bearing Race2274308-1011 Thrust Bearing2370402-1002 Inner Race+ 2416077-262 Retaining Ring+ 2516003-405-90 1O-ring, mm Dia. x mm ID. [.0625 in. Dia. x .25 in. ID.]2616246-5161 Key, Used on [.75] diameter shaft2624500-6191 Key, Used on [.875] diameter shaft2716148-4124 Cap Screw2816032-6124 Cap Screw32170142-6001 Cover Plate (In K3 kit)3316032-6102 Cap Screw, Cover Plate (In K3 kit)+ 3416007-141O-ring, (In K2 & K3 kit)3570422-6182 CoverMounting Kits (Drawings and Parts list on Page #13)K270442-9291 Gear Pump Mounting Kit (for "A" SAE flange)K370142-9151 Cover Plate Kit, (for "A" SAE flange)K6990596-0001 Cover Plate Kit, (for "B" SAE flange)K770453-9011 Gear Pump Mounting Kit, (for "B" SAE flange)Seal Repair Kit 70422-9151 Seal Repair KitLegend Refer to specific item Parts list.

5 +Included in seal Repair kits 70422 or 70423 Item 1 Drive Shaft IdentificationItem 1 - Drive Shaft IdentificationPart NumberInput DriveOutput Drive70442-235, [ ] Dia. Keyed70402-201, 13 Tooth70402-207, 15 Tooth70402-204, [.875] Dia. Keyed9 ToothInternal41 ToothExternal9 ToothInternal70452-200, 13 Tooth70442-228, 15 Tooth70442-225, 13 Tooth70442-246, 15 Tooth70442-231, [.875] Dia. Keyed9 ToothInternal70402-206, 13 Toothw/ Retaining Ring GrooveUsed with 2-bolt A Flange backplateUsed with 2-bolt B Flange backplateUsed with 2-bolt A Flange backplateUsed with 2-bolt A Flange backplate7 Model 70422 or 70423 Item 2 - Model 70422 Backplate Assembly(0 - 38 cm3/r [0 - in3/r] Displacement)Item 2 - Model 70422 Parts List (0 - 38 cm3/r [0 - in3/r] Displacement)LefthandRighthandRotationRo tationItemPart (a)70421-31870421-3431 Rear Porting Backplate Assembly2(b)70421-32770421-3341 Opposite Side Porting Backplate Assembly2(c)70452-30270452-3041 Auxiliary 2-Bolt A Flange Series 82-2, Opposite Side Porting Backplate2(d)---70452-3171 Auxiliary 2-Bolt B Flange Series 101-2, Opposite Side Porting Backplate2-170421-1501 Bearing2-216103-1032 Plug Assembly+ 2-2-116133-32O-ring, mm Dia.

6 X mm [.0625 in. Dia. x .2969 in. ]2-370422-4281 Guide PinLegend+Included in seal Repair kit listed on page left (CCW) or right (CW) directionsgiven are viewed from the input shaft end of the Rotation(CCW)2-22-2-1 Righthand Rotation(CW)2-3(Loctited)Lefthand Rotation(CCW)Righthand Rotation(CW)2(a)Rear Porting2(b)Opposite Side Porting2-22-2-1 Lefthand Rotation(CCW)Righthand Rotation(CW)2(c)Opposite Side Porting with 2-Bolt A FlangeLefthand Rotation(CCW)Righthand Rotation(CW)2(d)Opposite Side Porting with 2-Bolt B Flange8 Model 70422 or 70423 Item 2 - Model 70423 Backplate Assembly(0 - 45 cm3/r [0 - in3/r] Displacement)Item 2 - Model 70423 Parts List (0 - 45 cm3/r [0 - in3/r] Displacement)LefthandRighthandRotationRo tationItemPart (a)70423-30370423-3011 Rear Porting Backplate Assembly2(b)70423-30670423-3121 Opposite Side Porting Backplate Assembly2(c)70453-30170453-3031 Auxiliary 2-Bolt A Flange Series 82-2, Opposite Side Porting Backplate2(d)---70453-3071 Auxiliary 2-Bolt B Flange Series 101-2, Opposite Side Porting Backplate2-170421-1501 Bearing2-216103-1032 Plug Assembly+ 2-2-116133-32O-ring, mm Dia.

7 X mm [.0625 in. Dia. x .2969 in. ]2-370422-4281 Guide PinLegend+Included in seal Repair kit listed on page left (CCW) or right (CW) directionsgiven are viewed from the input shaft end of the Rotation(CCW)2-22-2-1 Righthand Rotation(CW)2-3(Loctited)Lefthand Rotation(CCW)Righthand Rotation(CW)2(a)Rear Porting2(b)Opposite Side Porting2-22-2-1 Lefthand Rotation(CCW)Righthand Rotation(CW)2(c)Opposite Side Porting with 2-Bolt A Flange2(d)Opposite Side Porting with 2-Bolt B FlangeLefthand Rotation(CCW)Righthand Rotation(CW)9 Model 70422 or 70423 Item 4 - Compensator Assembly4-14-24-34-44-64-54-74-84-94-104 -114-94-104-114-124-134-144-154-164-174- 184-19-14-19 Lefthand (CCW) Pump RotationRighthand (CW) Pump RotationFits Both Pump Rotations (Righthand (CW) rotation shown)Pressure-Flow CompensatorPressure Compensator4(a) 70422-HU4(b) 70422-HY4(c) 70422-HR*4-11, Cover not included with non-set compensator assy.*4-11 Cover*4-11 Cover*4-11 Covernon-setnon-setnon-set10 Model 70422 or 70423 Item 4 - Compensator Parts ListItem 4 - Parts List (Refer to drawings)ItemPart (a)70422-HU1 Non-Set Pressure-Flow Compensator Assembly, Lefthand Rotation4(b)70422-HY1 Non-Set Pressure-Flow Compensator Assembly, Righthand Rotation4(c)70422-HR1 Non-Set Pressure Compensator Assembly4-1N/S1 Compensator Body4-2N/S1 Pressure Spool4-370422-4051 Spring Pivot Cap4-417063-111 Spring+4-516003-111O-ring, mm Dia.

8 X mm [.0937 in. Dia. x .5625 in. ]4-670421-4531 Pressure Spring Follower+4-716015-181O-ring, mm Dia. x mm [.0937 in. Dia. x .875 in. ]4-870422-6061 Adjustment Cap, Pressure4-970422-6201or2 Set Screw4-1016024-41or2 Nut4-11*70422-618*1or2 Cover*4-12N/S1 Flow Spool4-1370411-4111 Spring Pivot Cap4-1417029-51 Spring+4-1516003-4-901O-ring, mm Dia. x mm [.0625 in. Dia. x .2187 in. ]4-1670421-4771 Flow Spring Follower+4-1716133-61O-ring, mm Dia. x mm [.078 in. Dia. x .468 in. ]4-1870422-6021 Adjustment Cap Flow4-1916103-1032 Plug Assembly+ 4-19-116133-32O-ring, mm Dia. x mm [.0625 in. Dia. x .2969 in. ]Legend+Included in seal Repair kit listed on page Not Sold Separately* Covers are not included with Non-Set CompensatorFactory Pre-set Compensator Assemblies listed on page # 70422 or 70423 Pre-set Pressure-Flow Compensator AssembliesNon-SetPre-setAssemblyAssembly Pump RotationPressure SettingFlow Setting70422-HU70422-AY-03 Lefthand (CCW)210 bar [3050 50 lbf/in2] bar [200 10 lbf/in2]70422-HU70422-BH-03 Lefthand (CCW)191 bar [2770 30 lbf/in2] bar [220 10 lbf/in2]70422-HU70422-BL-03 Lefthand (CCW)183 bar [2650 50 lbf/in2] bar [365 25 lbf/in2]70422-HU70422-DE-03 Lefthand (CCW)193 bar [2800 50 lbf/in2] bar [200 10 lbf/in2]70422-HU70422-DU-03 Lefthand (CCW)176 bar [2550 50 lbf/in2] bar [275 25 lbf/in2]70422-HU70422-EQ-03 Lefthand (CCW)210 bar [3050 50 lbf/in2] bar [375 25 lbf/in2]70422-HU70422-GD-03 Lefthand (CCW)176 bar [2550 50 lbf/in2] bar [250 25 lbf/in2]70422-HU70422-GN-03 Lefthand (CCW)

9 155 bar [2250 50 lbf/in2] bar [275 25 lbf/in2]70422-HU70422-GP-03 Lefthand (CCW)169 bar [2450 50 lbf/in2] bar [275 25 lbf/in2]70422-HU70422-HL-03 Lefthand (CCW)210 bar [3050 50 lbf/in2] bar [355 15 lbf/in2]70422-HY70422-BM-01 Righthand (CW)210 bar [3050 50 lbf/in2] bar [200 10 lbf/in2]70422-HY70422-BU-01 Righthand (CW)131 bar [1900 50 lbf/in2] bar [200 10 lbf/in2]70422-HY70422-DB-01 Righthand (CW)238 bar [3450 50 lbf/in2] bar [200 10 lbf/in2]70422-HY70422-DJ-01 Righthand (CW)210 bar [3050 50 lbf/in2] bar [375 25 lbf/in2]70422-HY70422-DW-01 Righthand (CW)155 bar [2250 50 lbf/in2] bar [200 10 lbf/in2]70422-HY70422-ED-01 Righthand (CW)169 bar [2450 50 lbf/in2] bar [275 25 lbf/in2]70422-HY70422-ET-01 Righthand (CW)176 bar [2550 50 lbf/in2] bar [200 10 lbf/in2]70422-HY70422-EZ-01 Righthand (CW)176 bar [2550 50 lbf/in2] bar [250 10 lbf/in2]70422-HY70422-FB-01 Righthand (CW)191 bar [2770 30 lbf/in2] bar [220 10 lbf/in2]70422-HY70422-FL-01 Righthand (CW)193 bar [2800 50 lbf/in2] bar [300 15 lbf/in2]70422-HY70422-FR-01 Righthand (CW)210 bar [3050 50 lbf/in2] bar [275 25 lbf/in2]70422-HY70422-GA-01 Righthand (CW)172 bar [2500 50 lbf/in2] bar [300 10 lbf/in2]70422-HY70422-GR-01 Righthand (CW)193 bar [2800 50 lbf/in2] bar [250 25 lbf/in2]70422-HY70422-GU-01 Righthand (CW)210 bar [3050 50 lbf/in2] bar [250 25 lbf/in2]70422-HY70422-HK-01 Righthand (CW)210 bar [3050 50 lbf/in2] bar [355 15 lbf/in2]70422-HY70422-HM-01 Righthand (CW)

10 176 bar [2550 50 lbf/in2] bar [355 15 lbf/in2]Pre-set Pressure Compensator AssemblyNon-SetPre-setAssemblyAssemblyPu mp RotationPressure Setting70422-HR70422-CA-04 Both210 bar [3050 50 lbf/in2]70422-HR70422-CH-04 Both162 bar [2350 50 lbf/in2]70422-HR70422-CK-04 Both148 bar [2150 50 lbf/in2]70422-HR70422-CL-04 Both141 bar [2050 50 lbf/in2]70422-HR70422-CR-04 Both107 bar [1550 50 lbf/in2]70422-HR70422-DH-04 Both176 bar [2550 25 lbf/in2]70422-HR70422-FG-04 Both159 bar [2300 50 lbf/in2]70422-HR70422-GE-04 Both169 bar [2450 25 lbf/in2]70422-HR70422-HB-04 Both190 bar [2750 50 lbf/in2]70422-HR70422-HE-04 Both110 bar [1600 50 lbf/in2]70422-HR70422-HN-04 Both114 bar [1650 25 lbf/in2]Factory Pre-set CompensatorAssemblies12 Model 70422 or 70423 Item 3 - Housing Identification5-15-25-35-55-45-65-75-85- 95-75 Item 3 Housing IdentificationItemPart Machined370402-304A70402-310C70402-336B7 0402-371A, B"A" Drain Port .5625-18 SAE Straight Thd."B" Drain SAE Straight Thd. "C" Drain Port Item 5 - Rotating Kit AssemblyItemPart 70422 Rotating Kit Assembly0 - 38 cm3/r [0 - in3/r] 70423 Rotating Kit Assembly0 - 45 cm3/r [0 - in3/r] Assembly5-2 NSS1 Spider5-3 NSS1 Spider Pivot5-4 NSS1 Retainer5-5 NSS1 Piston Block5-6 NSS3 Pins5-7 NSS2 Washer5-8 NSS1 Spring5-9 NSS1 Retaining RingNSS - Not Sold Separately13 Model 70422 or 70423 Mounting KitsKit 2, Gear Pump Mounting(To Mount "A" SAE flanges)ItemPart Pump Mounting KitK2-116007-141O-ring, mm Dia.