4 - 10
Auxiliary Relief Valves (continued)
Dipper Ram
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).
b Connect a 0 - 400 bar (0 - 6000 lb/in
2
) pressure
gauge and adaptor to port G1 on the hydraulic
pump (see view A on page 4 - 1).
2 If not already done, temporarily increase the pressure
setting of the MRV (see Auxiliary Relief Valves,
General, step 2).
3 Start the engine, lower the gate lock lever and run the
engine at maximum no-load speed in the S mode.
4 Pressure Adjustment
Note: For accurate setting, the pressure should be adjusted
up to the required level. Release lock nut X. Adjust setting
screw Y to indicate a pressure below the required level and
then bring the pressure back up for final setting. Tighten lock
nut X.
a Raise the boom to its full height.
b Move the dipper fully out and then continue to
operate the control lever, as at A.
c The pressure gauge reading (Dipper out) should be
compared to the technical data at the start of the
section. If it is outside the limits, adjust ARV F.
d Move the dipper fully in and then continue to
operate the control lever, as at B.
e Compare the pressure gauge reading to that stated
in the technical data section at the start of the
section. If it is outside the limits, adjust Auxiliary
Relief Valve G.
5 If further ARV tests are necessary carry out the relevant
procedures detailed in this section. If no further ARV
tests are required, restore the MRV pressure setting to
its original value (see Auxiliary Relief Valve, General,
step 3).
6 Stop the engine and release the hydraulic pressure (see
Releasing Tank Pressure). Remove the pressure gauge
and adaptor.
Section E Hydraulics
9803/6410
Section E
4 - 10
Issue 1
Pressure Testing
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