Repair Information - Eaton

1 Eaton Medium Duty Piston PumpModel 70360 Variable Displacement Piston Pump40,6 cm3/r [ in3/r] or 49,2 cm3/r [ in3/r] DisplacementsManual Controlled -02 Repair InformationDecember 19982 Model 70360 Table of ContentsIntroduction .. 2 Identification .. 3 Tools Required .. 3 Parts Drawing .. 4 - 5 Parts List .. 6 - 7 Repair informationDisassembly .. 8 - 10 Reassembly .. 11 - 12 Fault - Logic Troubleshooting .. 13 - 17 Start-up Procedure .. 18 IntroductionThis manual provides service Information for Eaton Models 70360 variable displacement piston pumps. Stepby step instructions for the complete disassembly, inspection, and reassembly of the pump are given. Thefollowing recommendations should be followed to insure successful 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.

2 Do not wipe them dry with paper towels or 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 makeup for the accuracy of pump repairs on an authorized test stand is 70360 Tools Required9/16, 7/8, 1-1/8 in. sockets and/or endwrenchesTorque wrench (203 [150 ] capacity)Ratchet wrench7/16 in. Allen wrench or bit socketInternal and external retaining ring pliersSmall screwdrivers (2)Hammer (soft face)Light Petroleum JellySeal driver or similar toolSerial Number Code:A 96 01 31 JBTester's InitialsDay of Month (two digits)Month (two digits)Revision level of parts two digits of year built.( 91 for 1991 etc.)Identification Numbers - Manually Variable Displacement Piston PumpIdentification label on control arm side of - Product Number Description70360 = Single Piston Pump78362 = Single Piston Pump with Gear Pump78361 = Tandem Piston Pumps78363 = Tandem Piston Pumps with Gear PumpB - Sequential NumberingC - Engineering Design CodeSingle Pump - Product Number:7 0 3 6 0 - R A A - 02 Tandem Pumps - Product Number:7 8 3 6 3 - R A B - 02 AABBEach order must include the following Product and/or Part Number2.

3 Serial Number Code3. Part Name4. QuantityCC4 Model 70360 PartsDrawingPump drawn below is typical of a righthand rotation assembly for rear pump of (D2)Port(D2)53-120516174165 Shaft assembly for single pump or front pump of LabelLocated on Control Arm Side5 Model 70360 PartsDrawingNote "V" notchlocationsLefthandRotationRighthandR otationValve PlateIdentification25-1 Used in place of Auxiliary to Backplate Assembly Identification section for additional (K3-2)(K3-1)(K3-3)Port (A)Port(C1)Port(C1)Port (S)Port (C2)Port (B)Port (A)Port (B)2625-21522525-3-325-3b2278-182378-183 8303139291819614025-34529-1333643K3K237- 13725-125-226152252278-182378-181825-325 -3-325-3-325-3b19K1 Assembly for unit withoutgerotor charge for single pump or rear pump of 70360 Parts Pin31 Crush Ring+ 41 Retaining Ring+ 52 Retaining Ring66 Screw72 Spring82 Plug Assembly+ 8-12O-ring, 2,38 mm Dia.

4 X 22,23 mm [.0937 in. Dia. x .875 in. ]91 Rotating Kit Assembly101 Cover Plate SA+ 10-11 Seal, Trunnion Shaft116 Washer121 Cover Plate SA1 Bearing Cup141 Bearing Cup+ 151 Housing Gasket162 Thrust Race171 Needle Thrust Bearing182 Cap Screws192 Cap Screws+ 201 Shaft Seal, Drive201 Spacer (Used in rear pump of tandem in place of drive shaft seal.)221 Relief Valve for Port "A"231 Relief Valve for Port "B"241 Housing Assembly24-11 Bearing (press fit)251 Backplate Assembly261 Valve Plate271 Drive Shaft281 Camplate - Square End Trunnion2 Bearing Cone291 Charge Pump Adaptor301 Inner Gerotor311 Outer Gerotor321 Key, Drive Shaft+ 331O-ring (In K2 & K3 kit)341 Coupler351 Mounting Bracket361 Cover Plate (In K3 kit)371 Plug Assembly+ 37-11O-ring, 2,21 mm Dia. x 16,36 mm ID. [.087 in. Dia. x .644 in. ID.]381 Key, Gerotor Pump Adapter+ 391 Molded O-ring402 Washer411 Washer421 Key, Camplate Trunnion432 Cap Screws, Cover Plate (In K3 kit)441 Insert, Camplate456 Washer531 Plug Assembly+ 53-11O-ring, 2,20 mm Dia.

5 X 16,35 mm ID. [.087 in. Dia. x .644 in. ID.]541 Plug Assembly+ 54-11O-ring, 2,20 mm Dia. x 16,35 mm ID. [.087 in. Dia. x .644 in. ID.]+ 592O-ring, 2,38 mm Dia. x 88,9 mm ID. [.0937 in. Dia. x in. ID.]7 Model 70360 Parts KitsK11 Tandem Piston Pump Mounting KitK1-1141T Coupler, 33,02 mm [ in.] long+ K1-21O-ring, 1,59 mm Dia. x 101,6 mm ID. [.0625 in. Dia. x 4 in. ID.]K1-32 Cap ScrewsK21 Gear Pump Mounting Kit+ K2-11O-ring, 1,59 mm Dia. x 82,55 mm ID. [.0625 in. Dia. x in. ID.]K2-21 WasherK2-32 Cap ScrewsK31 Cover Plate Kit+ K3-11O-ring, 1,59 mm Dia. x 82,55 mm ID. [.0625 in. Dia. x in. ID.]K3-21 Cover PlateK3-32 Cap ScrewsSeal Repair Kits1 Seal Repair Kit for 70360 piston pump. (Order two for tandem pumps)1 Control Shaft Bearing Shim Kit (to replace crush ring after replacement of major part).Legend+Common parts to seal Repair 70360 DisassemblyThe following disassemblyprocedure applies to a single pumpwith or without gear pump Therepair procedure for tandempumps, once they are separated, isbasically the same.

6 The basicconfiguration differences between asingle and tandem pumps are thebackplates, pump shafts andhousing assemblies. In mostcases, only the rear pump of tandem units contain a chargepump, which is common to both the front and rear pump. Therear tandem pump does not incorporate a shaft clean the Eaton Model 70360 or 78362 variabledisplacement pump before anyrepairs are attempted. Whenworking on tandem pumps,separate the front and rear the pump with theinput shaft down. Use a 9/16 or end wrench to removethe pump adapter cover plate orgear pump (see Figure 2).2 Use a pick or similar tool toremove the adapter cover plate orgear pump o-ring (see Figure 3).3 Use a 7/16 in. Allen wrench orbit socket remover to remove thecharge pressure relief valve springretainer from the pump adaptorassembly (see Figure 4).4 Use a pencil magnet or similartool to carefully remove the chargepressure spring and poppet fromthe pump adaptor assembly (seeFigure 5).

7 Use caution not to dropthe charge pump poppet into thepump adaptor charge pressure reliefvalve and poppet may be of thestandard or high pressure type. The( to bar [100 to 150 PSI])standard spring and poppet areshown on the bottom and theoptional high pressure ( bar [200 to 300 PSI]) springand poppet is shown on the same charge pressure relief valve spring retainer is usedwith either the standard or highpressure (see Figure 6).6 Use a 7/8 in. socket or endwrench to remove the optionalbypass valve assembly from thebackplate (see Figure 7).7 The internal seal may be replaced by first removing thesmall retaining ring on the end of the bypass valve. Removeand replace the o-rings (see Figure 8).8 Use a 1-1/16 in. socket or endwrench to remove the two highpressure relief valves from thepumps backplate assembly (seeFigure 9). Each system relief valveassembly is identified by both itspart number and relief valve settingas shown on in Parts InformationManual support the pumpassembly.

8 Use a 9/16 in. socket orend wrench to remove the four capscrews retaining the charge pumpadapter the cap screws removed,remove the charge pump adaptorassembly from the backplate (seeFigure 11).Note: The front pump assembliesdo not have charge pump the adapter assemblyover. Use an o-ring pick or similartool remove the o-ring seal (seeFigure 12).12 Inspect the gerotor pocket and needle bearing located inthe charge pump adapter. The needles in the needle bearingmust remain intact in the bearing InformationFigure 1 Figure 2 Figure 3 Figure 5 Figure 4 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 129 Model 7036013 When the needle bearingassembly is replaced, thenumbered end of the bearing mustface toward the flange side of theadapter to the dimension as shown(see Figure 13).14 With the charge pump adapterremoved, remove the charge pumpassemblies outer and inner gerotorring.

9 Next, remove the small drivekey from the pump shaft (seeFigure 14 and 15).15 Charge pumps are available intwo different displacements Chargepump displacements are based onthe thickness of the gerotorassembly and the depth of the pocket located in the chargepump adapter. To determine the displacement, refer to thetable Pocket DepthDisplacementDepth of Pocketcm3/r [in3/r]mm [in.] [.42] [.25] [.84] [.50]16To separate the backplateassembly from the dowel pins inthe pump housing assembly, inserttwo screwdrivers betweenbackplate and housing assemblyand pry upward (see Figure 16).17 After separation, remove thebackplate from the the backplate assemblyover and inspect the needlebearing. The needles in the needlebearing must remain intact in thebearing cage (see Figure 17).19 When the needle bearingassembly is replaced, thenumbered end of the bearing mustface the valve plate side of thebackplate to the dimension asshown (see Figure 18).

10 20 With the backplate removed,remove the gasket from the pumphousing assembly and discard (seeFigure 19).21 Remove the valve plate from the piston block : This valve plate may have stuck to the backplateassembly that was just previously directional rotation (CW or CCW) is identifiedby the location of the metering slots located on the face of thevalve plates. Pump inputrotation should always turninto the metering slots (seeFigure 20). A clockwisevalve plate is shown on theleft and a counter clockwisevalveplate is on the : Whenever pump input rotation is changed, the valveplate must be replaced along with the desired rotation chargepump the rotating kit assembly by carefully retaining itin the housing assembly. Lift the housing and rotating kitassembly and turn over assemblies allowing the rotating kitassembly to slide down the input shaft and out of the model 70360 variabledisplacement pumps areavailable in two differentdisplacements.