4 - 4
Servo Accumulator
1 Prepare the Machine
a Put the operator levers into neutral and lower the
gate lock lever. Start the engine and park the
machine on level ground. Operate the dipper out
and lower the boom to set the bucket on the
ground. Stop the engine. Release the hydraulic oil
tank pressure. (See Releasing Tank Pressure).
2 Accumulator Pressure
3 With the servo isolator lever lowered, start the engine.
4 Raise the boom to its full height and stop the engine.
switch the ignition ON.
5 Move the boom operating lever fully from neutral to
lower and back to neutral and check the boom begins
to lower and then stops. Repeat six times, checking
that the boom lowers after each time.
6 If the boom lowers three or more times, the gas pressure
in the accumulator is satisfactory.
7 If the boom lowers twice or less, investigate for internal
leakage.
Section E Hydraulics
9803/6410
Section E
4 - 4
Issue 1
Pressure Testing
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