4 - 12
Auxiliary Relief Valves (continued)
Rockbreaker ARV (Monoboom)
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 hammer on the
ground. Stop the engine. Release the hydraulic oil
tank pressure. (See Releasing Tank Pressure).
b Fit two caps B to the hammer pipes on the dipper.
c Connect a 0 - 400 bar (0-6000 lbf/in
2
) pressure
gauge to test point G1 (see view A on page 4 - 1).
2 Start the engine, lower the gate lock lever and run the
engine at maximum no-load speed in the S mode.
3 Operate the hammer by pressing the button C on the
front of the L.H. control lever. Check the pressure on
the gauge, adjust ARV L.
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.
5 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 - 12
Issue 1
Pressure Testing
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