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Summary of Contents for Eaton 70523
- Page 1 No. 6-617 Eaton ® January 1998 Medium Duty Piston Pump Parts and Repair Information Model 70523 or 70553, 0 -69 cm /r [0-4.21 in /r] Displacement Pressure or Pressure-Flow Compensated Piston Pumps...
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Page 2: Table Of Contents
Fault - Logic Troubleshooting ................17 - 19 Introduction This manual provides service information for the Eaton Models 70523 Pressure or Pressure - Flow Compensated 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
Stamped on each units mounting flange. Single Pump - Product Number: A - Product Number Description 70523 = Single Piston Pump 7 0 5 2 3 - R A A 70553 = Single Piston Pump, w/ Aux. Flange B - Rotation... -
Page 4: Parts Drawing
Model 70523 Parts Drawing Pump drawn below is typical of a righthand (CW) rotation pump. Serial code and assembly number location 32 33 (Cover only) All left (CCW) or right (CW) directions given are viewed from the input shaft end of the pump. -
Page 5: Parts List
Model 70523 Parts List Item Part No. Qty. Description ♦ Drive Shaft (Identification drawing on page #6) ♦ Backplate Assembly (Identification drawing on page #7) ♦ Housing Assembly (Identification drawing on page #10) 77010-9 Bearing ♦ Compensator Assembly (Identification drawing on page #8 & 9) ♦... -
Page 6: Item 1 - Drive Shaft Id
Model 70523 Item 1 - Drive Shaft Identification Item 1 Drive Shaft Identification Part Number Input Drive Output Drive 9 Tooth External 70502-200, 14 Tooth 13 Tooth 70502-202, External 31.8 [1.25] Dia. Keyed 9 Tooth External 70552-200, 14 Tooth 70552-203, 14 Tooth 70552-209, 31.8 [1.25] Dia. -
Page 7: Item 2 - Backplate Assembly
Model 70523 Item 2 - Backplate Assembly 2(a) 2(c) Top Mounted Compensator Top Mounted Compensator w/ "A" SAE Aux. Flange (Loctited) Lefthand Rotation Righthand Rotation (CCW) (CW) 2(b) Rear Mounted Compensator Lefthand Rotation Righthand Rotation (CCW) (CW) Item 2 - Parts List... -
Page 8: Item 4 - Compensator Assembly And Parts List
Model 70523 Item 4 - Compensator Assembly Pressure-Flow Compensator Pressure Compensator *4-11 *4-11 *4-11 Cover Cover Cover non-set non-set non-set 4(a) 4(b) 4(c) 70523-FW 70523-FU 70523-FT Lefthand (CCW) Pump Rotation Righthand (CW) Pump Rotation For Both Pump Rotations *4-11, Cover not included with non-set compensator assy. -
Page 9: Factory Pre-Set Compensator Assemblies
Model 70523 Item 4 - Compensator Parts List Item 4 - Parts List (Refer to drawings) Item Part No. Qty. Description 4(a) 70523-FW Non-Set Pressure-Flow Compensator Assembly, Lefthand Rotation 4(b) 70523-FU Non-Set Pressure-Flow Compensator Assembly, Righthand Rotation 4(c) 70523-FT Non-Set Pressure Compensator Assembly... -
Page 10: Item 3 - Housing Identification
Model 70523 Item 3 - Housing Identification Item 5 - Rotating Kit Assembly "B" Drain Port .875-14 SAE Straight Thd. Item 3 Rightside (CW) Housing Identification Item Part No. Port Machined 70500-303 Top of Pump 70500-311 70500-332 A, B Leftside (CCW) "A"... -
Page 11: Mounting Kits
Model 70523 Mounting Kits K2-3 K2-2 Kit 2, Gear Pump Mounting K2-1 (To Mount "A" SAE flanges) Item Part No. Qty. Description 70442-929 Gear Pump Mounting Kit K2-1 16007-14 O-ring, 1.59 mm Dia. x 82.55 mm ID. [.0625 in. Dia. x 3.25 in. ID.]... -
Page 12: Product Number
Model 70523 Product Number This list of product numbers is to aid in Item identification. If your product number is not listed contact your Eaton representitive. Model 70523, Lefthand Rotation (CCW) Description of Part Number Product Drive Shaft Backplate Assy. -
Page 13: Repair Information
Model 70523 Repair Information Cleanliness is extremely important when repairing The following parts will be needed to disassemble the these pumps. Work in a clean area. Before piston block: disconnecting the lines clean port area of pump. 2 ea. 1/2 l.D. x 1-3/8 O.D. flat washer, Disconnect hydraulic lines and remove pump 1 ea. -
Page 14: Inspection
Model 70523 Repair Information from cap may void the warranty on this assembly. 5 Examine the spider (5-2). It should be flat, no cracks, and no signs of wear in the pivot area. 15 Remove pressure adjustment cap (4-8) from compensator housing (4-1). - Page 15 Model 70523 Repair Information pivot bearing (20). Install trunnion covers (21) and 8 to 11 N-m [6 to 8 lb-ft ] and torque flow secure with retaining rings (12). adjustment cap (4-19) 14 to 16 N-m [10 to 12 lb-ft ].
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Page 16: Start-Up Procedure
Model 70523 Start-up Procedure When initially starting a rebuilt load sensing system, 5 Replace the coil wire or return the fuel flow to the it is extremely important that the start-up procedure injectors and start the engine. Run at low idle speed be followed. -
Page 17: Fault - Logic Troubleshooting
Model 70523 Fault - Logic Troubleshooting This fault - logic troubleshooting guide is a Explanatory diagnostic aid in locating pump problems. Diagram Symptom: Match the pump systems with the problem Action Step statements and follow the action steps shown in the box diagrams. - Page 18 Model 70523 Fault - Logic Troubleshooting Symptom: System will not Develop Proper Pressure or Flow Check Check Inspect Inspect Oil Level in Hyd. Fluid Inlet Screen Compensator Reservoir Specs or Strainer Signal Below Level Improper Clogged Fill to Install Clean...
- Page 19 Model 70523 Fault - Logic Troubleshooting Symptom: Pump Noisy or Overheating Check Check Inspect Replace Oil Level in Hyd. Fluid Inlet Screen Pump Reservoir Specs or Strainer Below Level Improper Clogged Fill to Install Clean Proper Proper Level Fluid Replace Diagram Action Step Comments 1.