Case 750L, Repair Manual

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DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
16. Continue to run the portable filter. Increase the en­
gine speed to full throttle. Heat the oil to operating
temperature by doing the following steps:
(A) Hold the blade control lever in the TILT position
for five seconds.
(B) Return the blade control lever in the NEUTRAL
position for five seconds.
(C) Repeat steps A and B until the oil in the hydraulic
system is at operating temperature.
17. Continue to run the engine at full throttle. Continue
to run the portable filter.
18. Operate each hydraulic circuit to completely extend
and retract the cylinders. Continue to operate each
hydraulic circuit two times, one after the other for 45
minutes.
19. Decrease the engine speed to low idle.
20. Continue to run the portable filter for 10 minutes.
21. Stop the portable filter
22. Stop the engine.
23. Remove the hose from the hydraulic reservoir.
24. Close the valve that is installed in the hole for the
drain plug.
25. Disconnect the inlet hose for the portable filter from
the valve. Remove the outlet hose from the reservoir
filter neck and replace filler cap.
26. Connect a vacuum pump to the breather hose of the
hydraulic reservoir.
27. Start the vacuum pump.
28. Remove the valve from the hole for the drain plug.
29. Install the drain plug.
30. Stop the vacuum pump. Disconnect the vacuum
pump from the opening in the reservoir and install
the breather.
31. Remove the hydraulic and hydrostatic filter elements
from the machine.
32. Install new hydraulic and hydrostatic filter elements
on the machine.
33. Start the engine. Check for oil leakage around the
new hydraulic and hydrostatic filters.
34. Stop the engine.
35. Check the oil level in the hydraulic reservoir. Add oil
as required.
NOTE: THE FOLLOWING PROCEDURES ARE FOR
FLUSHING WATER FROM THE HYDRAULIC SYSTEM
36. Start and run the engine at 1500 rpm (r/min).
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