8
TROUBLE SHOOTING GUIDE
PROBLEM POSSIBLE CAUSE REMEDY COMMENT
MACHINE WILL
NOT START
Power not plugged in and switched
on
Plug into appropriate outlet and
switch on at the wall, then at the
machine
If Electrical
No Fuel Check Fuel. Re-fill fuel tank. If Petrol or Diesel
No Fuel Open fuel tank ball valve or fuel
solenoid tap
If Petrol or Diesel
No or low water supply Check water supply If fitted with break tank and
auto shut-down
Float switch sticking Check float switch in water tank If fitted
Emergency-Stop engaged Disengage If fitted
Battery Isolator switch engaged Disengage If fitted
Starter Isolator Switch engaged Disengage If fitted
Pump oil level too low Top up with SAE15W40 or SAE30 If fitted with low level
switch
Pump oil over temp Allow to cool down If fitted with oil over temp
switch
Boiler over temp Allow to cool down If fitted with over temp
switch
Timed by-pass shutdown First switch off and then on again Some electrical units
Check if there is water in the suction
line
Check if the gun is open
Check if nozzle is not blocked
THE PUMP
RUNS BUT DOES
NOT PRODUCE
NOISE OR
PRESSURE
The pump is not primed and is
running dry
Check that the valves are not
blocked
Cavitation or air in the system Check suction hose. Increase
diameter size for bigger supply
Damaged ceramic plunger Replace Plunger
SHORT
PLUNGER SEAL
LIFE
Excessive pressure and/or temp in
the pumped water
Check the temperature and pressure
of inlet water
Problems with pump-motor
connection
Check status of drive shaft keys,
flexible coupling or pulley
The oil has not been changed
regularly
Change oil as instructed in the
maintenance schedule
SHORT BEARING
LIFE
Excessive pressure of pumped
water
Check the pressure
Sucking air Check Suction for Air Leaks
Valves Sticking Remove – Clean – Replace Check Water Quality
Seat in Unloader Valve Worn/ By-
Passing Water
Remove – Fit BPV Service Kit Or
Exchange Valve
Probably Indicate Service
Required
HP Jet Wrong Size – Worn Out Check – Replace
Worn Piston Plunger H.P. Seals Check – Replace Check Pistons for Cracks
Pressure control valve not set right Calibrate valve. Check seal seat
Low speed/rotation Check motor revs and drive
MACHINE
RUNNING OKAY,
BUT NOT
REACHING
SPECIFIED
PRESSURE
Insufficient Water Supply Check Available Water Supply. Clean
Filters in Suction Line. Increase
supply hose size
Valves Worn/Sticking Remove – Clean – Replace Check Water Quality
Blockages/Debris in By-Pass Valve Remove – Clean – Replace Check Filters for damage
Pump Sucking Air Seal Suction
FLUCTUATING
PRESSURE
Jet too small Check correct size and replace
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