Case 750L, Руководство по ремонту

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DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
27. Hold the blade control lever in the TILT LEFT position
and adjust the pressure Load Valve on the Flowmeter
as required to keep the pressure at 138 bar (2000
psi). Adjust the engine speed to keep the engine
running at 2000 r/min (rpm). Read the flow gauge
and record the reading.
28. If equipped, hold the ripper control lever in the LIFT
position and adjust the pressure Load Valve on the
Flowmeter as required to keep the pressure at 138
bar (2000 psi). Adjust the engine speed to keep the
engine running at 2000 r/min (rpm). Read the flow
gauge and record the reading.
29. Hold the ripper control lever in the LOWER position
and adjust the pressure Load Valve on the Flowmeter
as required to keep the pressure at 138 bar (2000
psi). Adjust the engine speed to keep the engine
running at 2000 r/min (rpm). Read the flow gauge
and record the reading.
30. Open the pressure Load Valve on the Flowmeter.
Decrease the engine speed and stop the engine.
31. Understanding the results refer to
Stack valve -
General specification (A.1 0.A)
32. Move the control levers in all directions to release
any pressure in the hydraulic circuits.
33. Tilt the ROPS cab/canopy to gain access to the hy­
draulic spool valve, refer to USER PLATFORM - Tilt
(E.34.A).
34. Remove the flowmeter return line from the reservoir
and replace the filler cap.
35. Turn the vacuum pump on.
36. Remove the tee fitting from the hydraulic pump hose
and the equipment control valve.
37. Connect the hydraulic pump hose to the equipment
control valve.
38. Turn the vacuum pump off and remove.
39. Lower and secure the ROPS cab/canopy, refer to
USER PLATFORM - Lower (E.34.A).
40. Check the oil level in the reservoir, add oil as needed.
41. Start and run the engine at 2000 r/min (rpm) and hold
the blade control in the raise position for 5 seconds.
Lower the blade to the ground and stop the engine.
42. Check for hydraulic leaks, repair as necessary.
NOTE: Understanding the Results of Flowmeter Test.
Next operation:
If the flow indication for each circuit was approximately the same as the flow indication at the same pressure in Hy­
draulic pump - Flow test (A.10.A), the circuit is good.
Next operation:
If the flow indication for a circuit was more than 3.79 Umin (1 gpm) less than the flow indication at the same pressure
in Hydraulic Pump Flow Test, there is leakage in that circuit.
Next operation:
Leakage in the dozer/ripper circuits can be caused by:
(A) Damaged or worn packing in one or both cylinders in that circuit.
87728445 1 2/28/2008
A.10.A
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