Section E - Hydraulics
E-17 E-17
9803-9570-4
Pressure Testing
Main Relief Valve (M.R.V.)
Make sure that the hydraulic oil is at correct working
temperature (50 °C, 122 °F).
Remove the engine cover (if fitted) K
Engine
Cover ( T B-1) and move the engine back on its mounting
to gain access K Engine Mounting ( T K-3).
On early machines, disconnect the inlet hose from the
valve block and refit using a tee piece and pressure test
point C. Later machines are already fitted with a test point.
Note: On early machines the test point may be left on the
machine permanently.
Connect a 0 - 400 bar (0 - 6000 lb/in
2
, 0 - 422 kg/cm
2
)
pressure gauge to the test point.
With the engine running at maximum speed, check the
M.R.V. setting by raising or lowering the skip until the rams
are fully open or closed and noting the maximum gauge
reading. Keep clear of the skip. The maximum pressure
should be as stated in K
Technical Data ( T E-1).
If the pressure is incorrect, slacken lock nut A on the main
relief valve and turn adjusting screw B clockwise to
increase the pressure or anti-clockwise to decrease the
pressure. Tighten lock nut A and re-check the pressure.
Remove the pressure gauge.
Move the engine back into its correct position K
Engine
Mounting ( T K-3) and refit the engine cover K Engine
Cover ( T B-1).
Fig 1.
Fig 2.
C
A
B
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