15 - 1
Section E Hydraulics
9803/8550
Section E
15 - 1
Issue 3*
Valves
*
Pressure Testing - Main Relief Valve
(M.R.V.) - In Situ
Connect a 0 - 400 bar (0 - 6000 lb/in
2
, 0 - 422 kg/cm
2
)
pressure gauge to test connector A located on the right-
hand end of the loader valve block.
With the engine running at 1500 rev/min, check the M.R.V.
setting by lowering the loader arm until the rams are fully
closed and noting the maximum gauge reading. Keep clear
of the loader arm. The maximum pressure should be as
stated in Technical Data.
If the pressure is incorrect, remove dome nut B, slacken
locknut C and adjust screw D. Turn it clockwise to increase
pressure and anti-clockwise to decrease the pressure. When
the pressure is correct, tighten the locknut.
Note that the pressure setting is stamped on the body of the
valve.
Torque Settings
Item Nm kgf m lbf ft
B 5.4 - 8.2 0.55 - 0.83 4 - 6
C 5.4 - 8.2 0.55 - 0.83 4 - 6
A
C
D
B
205160
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