D.
UNLOADER CYCLES RAPIDLY
1.
Rapid in-out movement of unloader plunger.
Leak in high pressure line, gun leak, or a “weep” type gun is in use.
Defective poppet (nylon plunger in lower portion of unloader). Poppet may
be deformed, pitted or sticking. Replace.
Scored unloader cup bore
– replace unloader.
Plugged nozzle
– clean/replace nozzle.
E.
MOTOR STOPS AFTER SHORT DURATION
1. Thermal Overload tripped.
Check for low voltage, excessive drive belt tension, extension cord not
adequate gauge for length or stuck starter switch in motor.
2. Excessive operating pressure.
Reduce pump operating pressure to manufacturers recommendation.
3.
Defective motor start switch (inside of motor) or motor fails to reach
operating speed & pressure.
Have an electrician verify motor condition.
4.
Damaged motor fan housing.
Straighten dented or bent motor fan housing or replace
F.
PUMP MOTOR FAILS TO START
1. No Power.
Check plugs, fuses and cords for contact.
2.
Thermal overload on motor tripped out (if so equipped).
Check for low voltage on power supply, extension cord not adequate gauge
for length,
check belt for excessive tension, and check pump for excessive
pressure on the unloader.
3
Excessive pressure in discharge hose.
Open gun valve to relieve pressure, check unloader for defects.
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