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 21/4 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
9803/3280
Section E
27 - 3
Issue 1
Service Procedures