BobCat E35 – HYDRAULIC PUMP – Hydraulic Pump Work Sheet

(Please review pump procedure as illustrated in “Pump Testing”. (See Pump Testing on Page 20-50-3.)

The outline listed below, gives the five adjustments for setting the hydraulic pump. The adjustments are listed in the order in which they MUST be performed. Below each adjustment is a list of the steps. Behind each adjustment is the page location within the Service Manual for the complete adjustment procedure.

1. Run engine at High Idle. Record no load engine rpm. (See Specifications on Page 60-10-2.)
__________ ENGINE RPM

2. Adjust Engine rpm (If necessary).

I. Test Fitting Installation (See Test Fitting Installation on Page 20-50-3.)

3. Remove the cap from the hydraulic pump outlet and install the quick coupler. Connect the hydraulic tester inlet hose to the quick coupler.

4. Remove the cap from the hydraulic control valve outlet section and install the quick coupler. Connect the hydraulic tester outlet hose to the quick coupler.

5. Remove the cap from the tee fitting on the hydraulic control valve inlet section. Install the adapter hose on the fitting.
If equipped with the hydraulic X-change, remove the line from the tee fitting and install a plug in the line. Install the
adapter hose on the tee fitting.

6. Install a jumper hose with a test port between the hydraulic control valve test port located in the outlet section and the adapter hose.

7. With the engine at High Idle, turn the hydraulic tester flow control clockwise until 6895 kPa (69 bar) (1000 psi) is shown on the gauge. Restrict the oil flow until the oil temperature is at a minimum of 66°C (150°F).

8. Turn the hydraulic tester flow control counter clockwise until all restriction is removed.

II. Pump Margin Pressure Adjustment (See Pump Margin Pressure Adjustment on Page 20-50-6.)

9. Remove the jumper hose from the hydraulic control valve test port and adapter hose.

10. Install a 3447 kPa (34,5 bar) (500 psi) Gauge on the hydraulic control valve test port.

11. Run engine at High Idle.

12. Restrict the flow on the hydraulic tester to 38 L/min (10 U.S. gpm) and record the pressure. Adjust the spool as
necessary to obtain a minimum of 1379 kPa (13,8 bar)(200 psi).
__________ PM PRESSURE

III. Main Relief Valve Adjustment (See Main Relief Valve Adjustment on Page 20-50-7.)

13. Install 34474 kPa (345 bar) (5000 psi) Gauge on the hydraulic control valve test port.

14. Turn the hydraulic tester flow control clockwise until maximum restriction.

15. Run the engine at high idle, raise the blade and dead-head in the UP position.

16. Adjust main relief valve as necessary to get 24476 ± 517 kPa (245 ± 5,2 bar) (3550 ± 75 psi).

17. Record pressure
__________ MRV PRESSURE

18. Remove the 34474 kPa (345 bar) (5000 psi) gauge, from the hydraulic control valve test port.

IV. Torque Limiter Adjustment (See Torque Limiter Adjustment on Page 20-50-8.)

19. Install jumper hose with a test port, between the hydraulic control valve diagnostic port on the outlet section and the adapter hose installed on the hydraulic control valve inlet section.

20. Install a 34474 kPa (345 bar) (5000 psi) Gauge to the test port on the jumper hose.

21. Adjust the hydraulic tester to 8963 kPa (89,4 bar) (1300 psi).

22. Adjust the torque limiter to obtain 87 – 95 L/min (23 – 25 U.S. gpm).

23. Record flow and engine rpm.
__________ FLOW
__________ ENGINE RPM

24. Remove the jumper hose.

25. Remove the hydraulic tester.

26. Remove the adapter hose and install the cap or hydraulic X-change hose (if equipped).

V. Direct Gear Pump Test (See Direct Gear Pump Test on Page 20-50-9.)

27. Remove the hose from the manifold.

28. Install the inlet of the tester to the hose removed from the manifold.

29. Install the outlet of the tester to the manifold.

30. Run engine at High Idle.

31. Turn the hydraulic tester flow control clockwise until 10342 kPa (103,4 bar) (1500 psi) is shown on the gauge.

32. Record the flow. There must be a minimum of 7,6 L/min (2 U.S. gpm).
__________ GEAR PUMP FLOW

33. Remove the hydraulic tester.

ALL PUMP ADJUSTMENTS ARE NOW COMPLETED

 

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