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- Page 1 No. 7-623 Eaton ® July,1995 Medium Duty Piston Pump Repair Information Model 70142 / 70144, 20.3 cm /r [1.24 in /r] Displacement and 70145, 23.6 cm /r [1.44 in /r] Displacement Variable Displacement Piston Pump 01 02 design code Valve Plate...
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Page 2: Table Of Contents
Start-up Procedure .................... Introduction This manual provides service information for the Eaton Models 70142 / 70144 and 70145 Variable Displacement Piston Pumps. Step by step instructions for the complete disassembly, inspection, and reassembly of the pump are given. The following recommendations should be followed to insure successful repairs. -
Page 3: Identification
Model 70142 / 70144 and 70145 Identification and Tools Required Identification Numbers Stamped on each unit. B - Rotation, A - Product Number Discription R = Righthand, 70142 = Piston Pump with Gerotor (20.3 cm /r [1.24 in /r]) L = Lefthand... -
Page 4: Exploded View Drawing
Model 70142 / 70144 and 70145 Parts Drawing - Figure 1-1 51-1 Date Code and Assembly Number Location 50-1 Left Side Right Side Shaft assembly for single pump or front pump of tandem. Shaft assembly for rear pump of tandem. - Page 5 Model 70142 / 70144 and 70145 49-1 49-2 K2-4 49-3 49-4 49-5 K2-3 K1-1 19-1 (K2-2) K2-3 design code K2-2 (K2-1) 19-1 K4-3 (K3-3) K4-2 (K4-4) (K4-1) design code Groove (K3-2) 34-1 (K3-1) 49-1 49-2 49-3 49-4 49-5 19-1 design code...
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Page 6: Parts List
Model 70142 / 70144 and 70145 Parts List Item Qty. Description Drive Shaft Backplate Assembly Housing Assembly Rotating Kit Assembly Camplate Washer Retaining Ring Retaining Ring Thrust Bearing Bearing Race + 11 Shaft Seal, Drive + 12 Housing Gasket Needle Bearing + 14 O-ring, 3.175 mm Dia. - Page 7 O-ring, 1.59 mm Dia. x 101.6 mm ID. [.0625 in. Dia. x 4 in. ID.] K4-3 Cap Screws K4-4 Washer Seal Repair Kit 70142-938 Seal Repair Kit for 70142, 70144 and 70145 piston pump. Legend Included in seal repair kit.
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Page 8: Disassembly And Inspection
Model 70142 / 70144 and 70145 Disassembly Disassembly The following instructions apply to a variable displacement Remove housing gasket from housing or backplate. piston pump with or without a gerotor charge pump. A tandem To remove rotating kit assembly from housing, first... -
Page 9: Reassembly
Model 70142 / 70144 and 70145 Reassembly Reassembly All parts should be cleaned and critical moving parts 13 Apply a small amount of petroleum jelly to the steel side of lubricated before reassembly. valve plate to hold in place for installation. Aligning the index... - Page 10 Model 70142 and 70145 Appendix A - Charge Pump Adapter Assembly Configuration for 13.8 to 17.2 bar [200 to 250 lbf/in ] or 36-4a 17.2 to 20.7 bar [250 to 300 lbf/in Charge Relief Valve 36-3a or 3b 36-2a Pressure Check Port or...
- Page 11 Model 70142 / 70144 and 70145 Appendix B - Rotating Kit Assembly Item Qty. Description Piston assemblies Spider Spider Pivot Retainer Piston Block Pins Washer Spring Retaining Ring The following parts are required to disassemble the piston block: 2 ea.
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Page 12: Fault-Logic Trouble Shooting
Model 70142 / 70144 and 70145 Fault - Logic Trouble Shooting Explanatory Diagram This fault - logic trouble shooting guide is a diagnostic aid in Symptom: locating transmission problems. Action Match the transmission symptoms with the problem statements Step and follow the action steps shown in the box diagrams. This will... - Page 13 Model 70142 / 70144 and 70145 Fault - Logic Trouble Shooting Symptom: Neutral Difficult or Impossible to Find Inspect Inspect External Control Servo Control Linkage (If used) Defective Defective Repair Repair Replace Replace Symptom: System Operating Hot Inspect Heat Check...
- Page 14 Model 70142 / 70144 and 70145 Fault - Logic Trouble Shooting Symptom: Operates in One Diection Only Inspect Inspect Inspect External Control Servo Control System Relief Linkage (If used) Valves Defective Defective Defective Repair Repair Repair Replace Replace Replace Symptom: System Response Sluggish...
- Page 15 Model 70142 / 70144 and 70145 Fault - Logic Trouble Shooting Symptom: System Will Not Operate In Either Direction Inspect Check Check External Check Dump Valve Oil Level in Control Charge Reservoir Linkage (If used) Pressure Below Level Defective Defective...
- Page 16 Model 70142 / 70144 and 70145 Fault - Logic Trouble Shooting Diagram Action Step Comments Inspect External Control Linkage for: 11 Inspect Charge Relief Valve for: a. misadjusted or disconnected a. improper charge relief pressure setting * b. binding, bent, or broken b.
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Page 17: Start-Up Procedure
The machine is now ready to be put into operation. Fill the reservoir with an approved oil that has been filtered through a 10 micron filter. Refer to Eaton Hydraulics Technical 10 Frequent filter changes are recommended for the first two Data sheet number 3-401 titled Hydraulic Fluid changes after placing the machine back into operation. - Page 18 Model 70142 / 70144 and 70145 Notes...
- Page 19 Model 70142 / 70144 and 70145 Notes...
- Page 20 Eaton Ltd. Hydraulics Division Hydraulics Division 15151 Hwy. 5 Glenrothes, Fife Eden Prairie, MN 55344 Scotland, KY7 4NW Telephone 44/592-771-771 Telephone 612/937-9800 Fax 612/937-7130 Fax 44/592-773-184 Copyright Eaton Corporation, 1993 Form No. 7-623 All Rights Reserved November, 1993 Printed in USA...