4 - 9
Auxiliary Relief Valves (continued)
Boom Ram (continued)
Boom Down
5 Prepare the machine
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).
6 It is not physically possible to fully close the boom ram,
without lifting the undercarriage of the ground.
Therefore the ARV’s B and C must be swapped over.
a Fully raise the boom and then continue to operate
the right control lever as at A.
b The pressure gauge reading (Boom down) should be
compared to the technical data at the start of the
section. If it is outside the limits, adjust ARV.
7 Stop the engine and release the hydraulic pressure,
(see Releasing Tank Pressure). Remove the pressure
gauge and adaptor. The Relief Valves for Boom up and
Boom down must be swapped and returned to the
correct ports.
8 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).
9 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 - 9
Issue 1
Pressure Testing
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