DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
9. If the hydraulic oil is not at operating temperature,
run the engine at full throttle and hold the bucket
control lever in the ROLLBACK position for 30
seconds. Then return the bucket c ontrol lever to
NEUTRAL for 15 seconds. Repeat this cycle until
the temperature of the oil is at least 52°C (125°F).
10. Continue to run the engine at full throttle. Read the
pressure gauge and record the Charge Pressure
reading. Stop the engine.
11. The pressure reading must be 26 - 28 bar (390 - 410
psi) or the re lief valve must b e adjus ted with shims.
12. If the pressure is correct, go to step 14. If the
pressure is not correct, loosen the cap on the
hydraulic reservoir. Remove the plug, shim (s),
spring, and poppet for the charge pressure relief
valve.
13. Inspect the parts of the charge relief valve. If the
parts are good, add shim(s) from the shim kit (part
number H407767) and repeat steps 9 through 13
until the pressure is correct.
IMPORTANT: For the following test the machine MUST
be raised up on supports until the tires are above the
floor. This is a safety procedu re if the hydra ulic parking
brakes fail to hold.
1 04/05/2005
A.10.A / 50
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