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Section E
23 - 7
Auxiliary Relief Valves - Using Hand Pump
8
Use the hand pump to raise approximately 172 bar
2
(2500 lbf/in
) pressure at the valve inlet.
Note: Raising the pressure at the valve inlet locks the anti-
cavitation cone C onto its seat, this allows the A.R.V.
adjusting screw lock nut 10 to be loosened (step 10).
If the pressure is maintained move to step 10.
If the pressure falls off rapidly, or if no pressure can be
obtained it is possible that the anti-cavitation cone is
not seating effectively, in this instance move to step 9.
9
If no pressure can be raised (see step 8) at the valve
inlet, remove the A.R.V. assembly and install anti-
cavitation lock-out bung 6 in the port marked ' RV' ,
make sure that the bung O-ring face seal D is facing
out. Re-fit the A.R.V. assembly.
Note: The anti-cavitation lock-out bung seals and locks the
A.R.V. anti-cavitation function. The bung is only suitable for
the test block application and must NEVER be fitted to the
valve block.
The bung can be extracted using a 3/8 - 16 UNC
threaded bolt.
10
Release the A.R.V. adjusting screw lock nut (see note):
Engage the nut at the end of setting body 2 using the
slot in special spanner 4, turn the nut anti-clockwise to
release the A.R.V. adjusting screw lock nut.
Note: Remember, it will not be possible to release the lock
nut if there is not approximately 172 bar (2500 lbf/in
pressure at the valve inlet.
11
Insert an allen key into adjusting pin 3 (T-Bar type
shown). Push the adjusting pin down and make sure it
has engaged with the A.R.V. adjusting screw.
Rotate the T-bar clockwise to increase the pressure
setting and anti-clockwise to decrease the pressure
setting.
After adjustment, use the slot in spanner 4 to lock the
A.R.V. adjusting screw lock nut (see note).
Note: Remember, pressure must be maintained at the valve
inlet to ensure the lock nut is tightened.
9803/3280
Hydraulics
Service Procedures
Purchased from www.WorkshopManuals.co.uk
C
2
)
Section E
23 - 7
0
S162570G
D
6
S162570H
4
2
S162570J
4
3
S162570K
Issue 1
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