HUGH CRANE (Cleaning Equipment) Ltd –
COMMANDO
®
5050
Page 16
TROUBLE SHOOTING
FAULT
CAUSE
ACTION
1. Knocking noise from
pump.
Water starvation.
Pump sucking in air.
Ensure that there is sufficient water in the
tanks.
Check that the strainer is not blocked and that
the pump inlet valve is open.
Check the suction hose for leaks, which might
allow air to be drawn in.
Water starvation.
Pump sucking in air.
Ensure that there is sufficient water in the
tanks.
Check that the strainer is not blocked and that
the pump inlet valve is open.
Check the suction hose for leaks, which might
allow air to be drawn in.
Lance nozzle too large
or missing.
Check that the correct nozzle is fitted and is in
good condition.
High pressure water
leak.
Examine the high pressure hose and fittings
for leakage.
Unloader not correctly
set up.
Have unloader checked by a suitably equipped
and trained engineer.
2. Loss of pressure.
Pump speed too low.
Check that engine speed is correct.
Pump speed to high.
Stop engine immediately
. Restart at idle and
reset engine speed.
Lance nozzle too small
or blocked.
Check that the correct nozzle is fitted and is in
good condition.
3. Pressure too high.
4. Safety valve passing
water.
Unloader not correctly
set up.
Have unloader checked by a suitably equipped
and trained engineer.
