TROUBLE SHOOTING
1. When switched on, the motor will not start
2. The motor stops suddenly
Malfunction
Probable Cause
2. Cables or sockets of extension cords
are broken
1. The electric socket Is faulty
3. Any built-in thermo safety switch has
switched off the pump
4. The motor has burned out
2. The low-level float switch in the header
tank, if fitted, has cut out the starter.
1. The thermo safety switch has switched
off the pump, due to overheating.
2. Air is sucked In the connections or in the
water feed hose.
1. The Inlet filter Is clogged
3. Unloader valve Is blocked or worn.
4. Pump valves (suction and delivery)
clogged or worn.
6. Pressure seals worn
5. Nozzle is of Incorrect size or is worn.
7. The chemical injector primary nozzle is
too small or is blocked.
2. Dirt In the suction valve.
1. Air is being sucked into the pump
3. Pressure seals worn
2. Presence of water in oil in crankcase.
1. Pressure seals worn
3. If there is a large amount of water
3. No pressure.
4. The pressure varies
5. Water leaking from the pump and
pressure drops
6. Pump noisy
2. Valves dirty or worn.
1. Air is being sucked into the pump.
3. Crank bearings worn.
4. Water temperature is too high
2. Unloader leaks from adjuster stem/shaft
1. Unloader seals are worn
3. Plumbing between unloader and nozzle
leaking
2. Seal O-rings worn.
1. Packings worn.
1. Plug O-rings worn.
1. Oil seats worn.
2. Operator has sprayed the pump with
water.
1. Condensed humidity in the oil
7. Pump pulses when gun is closed.
8. Water leaking from the pump head
9. Water leaking from the valve plugs
10. Oil leakage
11. Oil is milky / Water in the oil
Change the oil. NOTE: Water cannot enter the crankcase from
the pump. There is a gap between the pump head and the
crankcase.
Check and replace.
Check and replace.
Check and replace.
Check and replace.
Repair any leaks to hose and gun. There must be no leaks if the
unloader is to perform properly
Check and replace.
Check and replace.
Reduce temperature to below 50°C.
Check and replace.
Check and / or replace.
Check and / or replace.
Check hoses and suction connections.
Stop the machine. Replace pressure seals. Replace oil seals.
Change the oil.
Change the oil - humidity and water in the surrounding air often
causes this problem.
Replace
Replace
Check the valves and clean, or, if necessary, replace.
Check and / or replace.
Check that connections and locking rings are well tightened.
Check that the water feed hose is not leaking.
Check, clean or replace with the correct primary orifice
Replace.
Check the valves and clean, or, if necessary, replace.
Loosen and retighten adjustment knob or replace unloader
valve.
Check that connections and locking rings are well tightened.
Check that the water feed hose is not leaking.
Clean the Inlet filter.
Make sure the water supply is adequate. If this problem occurs
often, the switch will burn out, and there is no guarantee cover
offered by the switch manufacturer.
Check that mains voltage corresponds to the specifications.
Switch off the machine and let the motor cool for a few minutes.
Rewind or replace the motor.
Wait until the motor cools and switch on again. Make sure the
pressure is not so excessive as to cause a high current load.
Check cables. connections and terminal boards.
Check that there is power at the plug and check the fuses.
Remedy
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