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
