27 - 3
Hose Burst Protection Valves
Pressure Testing - Loader Lift Ram
(continued)
Relief Valve Pressure Test
If the hose burst protection valve has been stripped and
cleaned, then pre-set the valve as detailed in step 1. The
pressure test procedure is described in steps 2 to 6.
1 Pre-set the relief valve:
a Remove cap B and its copper washer. Using an
Allen key, turn the adjusting screw anti-clockwise
to remove all tension.
b Using your fingers, turn the adjusting screw
clockwise until a soft force (resistance) is felt.
c Using an Allen key, turn the adjusting screw a
further 2
1
/4 turns to pre-set the relief valve. Refit
the cap and washer.
2 Remove hose G from port C2. Cap and plug the hose
and valve port adapter (the valve port adapter MUST be
plugged, otherwise the test procedure will not work).
3 Remove hose J from port V2. Plug the hose but DO
NOT cap the valve port adapter.
4 Remove plug A and in its place fit a 0-400 bar (0-6000
lbf/in
2
) pressure gauge connected to a hand pump.
5 Use the hand pump to increase the pressure. When the
pressure reaches the setting of the relief valve, oil will
escape from port V2, shown at K. Note the maximum
gauge reading (the setting of the hose burst relief valve)
which should be 250 bar (3625 lbf/in
2
).
6 If necessary, adjust the pressure setting as follows:
a Remove cap B and its copper washer.
b Using an Allen key, turn the adjusting screw
clockwise to increase the pressure or anti-
clockwise to decrease the pressure. For
information; one full turn of the relief valve adjusting
screw is equivalent to approximately 110 bar (1595
lbf/in
2
).
c Replace the cap and washer.
d Repeat pressure test, adjust as necessary.
Section E
Hydraulics
9803/3280
Section E
27 - 3
Issue 1
Service Procedures
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