Related Manuals for Eaton 704342
Summary of Contents for Eaton 704342
- Page 1 No. 7-620 Eaton ® January, 1996 Medium Duty Piston Pump Repair Information 70342 70342 70344 78341 Tandem Model 70342 and 70344, 40.6 cm /r [2.48 in /r] Displacement Manually Variable Displacement Piston Pump...
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Page 2: Table Of Contents
Start-up Procedure ....................17 Introduction This manual provides service information for the Eaton Models 70342 and 70344 Manually 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 70342 and 70344 Identification and Tools Required Identification Numbers Manually Variable Displacement Piston Pump Stamped on each unit’s mounting flange. A - Product Number Discription B - Rotation 70342 = Single Piston Pump with Gerotor R = Righthand, 70344 = Single Piston Pump without Gerotor L = Lefthand 78341 = Tandem Piston Pump with Gerotor C - Sequential Letters... -
Page 4: Exploded View Drawing
Pump drawn below is typical of a righthand rotation pump. 53-1 Date Code and Assembly Number Location 52-1 24-1 Shaft assembly for single pump or front pump of tandem. Shaft assembly for rear pump of tandem. © Copyright 1994 Eaton Corporation... - Page 5 Model 70342 and 70344 Parts Drawing - Figure 1-1 Assembly for single pump or front pump of tandem. (70344) 25-3a 25-3 K1-3 25-3-3 25-3-3 Valve Plate Identification K1-1 Port "C" K1-2 Note "V" notch 25-1 locations Lefthand Righthand Rotation Rotation Port "D"...
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Page 6: Parts List
Model 70342 and 70344 Parts List Item Qty. Description O-ring, 2.38 mm Dia. x 36.5 mm I.D. [ .0937 in. Dia. x 1.4375 in. I.D.] Dowel Pin Washer Retaining Ring Retaining Ring Screw Spring Plug Assembly + 8-1 O-ring, 2.38 mm Dia. x 22.23 mm I.D. [ .0937 in. Dia. x .875 in. I.D.] Rotating Kit Assembly (parts list on page #6) Seal Cover Trunnion Cover... - Page 7 Model 70342 and 70344 Parts List (Cont.) Item Qty. Description Plug Assembly + 37-1 O-ring, 2.21 mm Dia. x 16.36 mm ID. [.087 in. Dia. x .644 in. ID.] Key, Gerotor Pump Adapter +n 39 Molded O-ring Washer Washer Key, Camplate Trunnion Cap Screws, Cover Plate (In K3 kit) Plug Assembly 52-1...
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Page 8: Disassembly And Inspection
Model 70342 and 70344 Disassembly The following instructions apply to a variable displacement 8 Remove housing gasket from housing or backplate. piston pump with or without a gerotor charge pump. A tandem 9 To remove rotating kit assembly from housing, first remove pump assembly should be separated into individual pumps pump from vise holding the rotating kit assembly in before disassembly. -
Page 9: Reassembly
Model 70342 and 70344 Reassembly 12 Install new o-ring on dump valve or plug. Install dump valve 1 All parts should be cleaned and critical moving parts or plug into backplate. Torque dump valve or plug to 36.6 to lubricated before reassembly. 40.7 N m [ 27 to 30 lbf 2 If necessary, press new bearing in housing to dimension... - 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 29-4a 17.2 to 20.7 bar [250 to 300 lbf/in Charge Relief Valve 29-3a or 3b 29-2a Pressure Check Port or Remote Charge Port 29-4 29-3...
- Page 11 Model 70342 and 70344 Appendix B - Rotating Kit Assembly Item Qty. Description Rotating Kit Assy. Piston Assembly Spider Spider Pivot Retainer Piston Block Pins Washer Spring Retaining Ring The following parts are required to disassemble the piston block: 2 ea. 3/8 in.
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Page 12: Fault-Logic Trouble Shooting
Model 70342 and 70344 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 give expedient aid in correcting minor problems eliminating Comment Inspect... - Page 13 Model 70342 and 70344 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 Inspect Check Exchanger Oil Level in Heat...
- Page 14 Model 70342 and 70344 Fault - Logic Trouble Shooting Symptom: Operates in One Direction 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 Check Inspect Inspect...
- Page 15 Model 70342 and 70344 Fault - Logic Trouble Shooting Symptom: System Will Not Operate In Either Direction Inspect Check Check External Check Dump Valve Oil Level in Control Charge (If used) Reservoir Linkage Pressure Below Level Defective Defective Fill to Repair Repair Proper...
- Page 16 * System/Charge Relief Valve Pressure Settings for Eaton’s d. damaged valve seat Variable Displacement Controlled Piston Pumps Check Oil Level in Reservoir: Inlet Vacuum 6 inHg max.
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Page 17: Start-Up Procedure
9 The machine is now ready to be put into operation. 3 Fill the reservoir with an approved oil that has been filtered through a 10 micron filter. Refer to Eaton Hydraulics 10 Frequent filter changes are recommended for the first two Technical Data sheet number 3-401 titled Hydraulic Fluid changes after placing the machine back into operation. - Page 18 Model 70342 and 70344 Notes...
- Page 19 Model 70342 and 70344 Notes...
- Page 20 Products in this catalog are manufactured Eden Prairie, MN 55344 Scotland, KY7 4NW 40880 Ratingen, Germany in an ISO-9001-certified site. Telephone 612/937-9800 Telephone 01-592-771-771 Telephone 02102-406-830 Fax 612/937-7130 Fax 01-592-773-184 Fax 02102-406-800 Copyright Eaton Corporation, 1994,1995 Form No. 7-620 All Rights Reserved Printed in USA...