4 - 14
Blade Auxiliary Relief Pressure
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. Lower the blade onto 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 G4 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 blade, and then continue to operate the
control lever at A.
b The pressure gauge reading should be compared to
the technical data at the start of the section. If it is
outside the limits, adjust ARV M.
c Lower the blade fully and then continue to operate
the control lever, as at B.
d Repeat step 4b and, if necessary, adjust ARV N.
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
9803/6020
Section E
4 - 14
Issue 1
Pressure Testing
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