22 - 2
Pressure Testing
Auxiliary Relief Valves (A.R.V's) - Using
Hand Pump
Insert the A.R.V. into the test block (service tool 892/00252).
Connect hand pump (service tool 892/00223) and a 0-400
bar (0-6000 lbf/in
2
) pressure gauge.
Plug the two large diameter (3/4 inch B.S.P.) ports of the test
block using blanking plugs (service tool 892/00059) and
bonded washers (service tool 1406/0021).
Pressurise until oil begins to escape from the drain hole D.
At this point the gauge will indicate the crack pressure of the
A.R.V.
The pressure should be as given below.
If required, adjust the pressure by removing dome nut A,
slackening locknut B and turning screw C.
Relief Valve Test Pressures
Pilot-operated relief valves - 7 bar (102 lbf/in
2
) below the
operating pressure given in Technical Data.
Direct acting relief valves - 10 bar (145 lbf/in
2
) below the
operating pressure given in Technical Data.
Note: Refer to Technical Data for type of relief valve fitted
to service.
Section E Hydraulics
9803/7130
Section E
22 - 2
Issue 1
Service Procedures
S221130
AA
CC
BB
DD
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