Excavator Valve - Precision Control (Servo)
(Machines up to serial no. 931159)
Pressure Testing
Load Sense Drain Regulator and Relief Valve
Make sure that the hydraulic oil is at working temperature,
i.e. 50°C (122°F).
Lower the backhoe bucket and loader shovel to rest on the
ground; stop the engine; operate the control levers to vent
residual hydraulic pressure.
1 Connect a 0 - 400 bar (0 - 6000 lbf/in
2
) pressure gauge
to pressure test connector A on the loader valve, (refer
to Service Tools).
2 With the engine running at 1500 revs/min, check that
the M.R.V. pressure is correct, see Loader Valve -
Pressure Testing, Main Relief Valve.
3 With the engine running at 1500 revs/min, operate a
stabiliser service fully and at the same time note the
reading in the gauge which should be as stated in
Technical Data.
Note: The ram must be 'held' open or closed when reading
gauge.
4 If the pressure is incorrect, loosen locknut D and adjust
screw C. Turn the screw C clockwise to increase
pressure and anti-clockwise to decrease the pressure.
When the pressure is correct, tighten the locknut and
check the pressure again. Adjust as required.
23 - 10
Section E Hydraulics
9803/3280
Section E
23 - 10
Issue 2*
Service Procedures
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