PROBLEM POSSIBLE CAUSE SOLUTION
MOTOR STRAINS
UNDER LOAD
(CONTINUED FROM
PREVIOUS PAGE)
Misadjusted unloader valve Call technical support.
Pump low or out of oil Check oil level.
OIL SQUIRTS OUT OF
OIL CAP ON PUMP
Pump over filled with oil Maintain oil level halfway up on the sight
glass at rear of pump or at top of notch on
dipstick (where applicable).
PUMP RUNNING
NORMALLY BUT
PRESSURE OUTPUT
LOW
Pump sucking air Check water supply and possibility of air
seepage.
Valves sticking Check and clean or replace if necessary.
Unloader valve seat faulty Check and replace if necessary.
Nozzle incorrectly sized Check and replace if necessary (See serial
plate for proper size).
Worn piston packing Check and replace if necessary.
WATER DRIPPING
FROM UNDER PUMP
Piston packing worn Check and replace if necessary.
O-Ring plunger retainer worn Check and replace if necessary.
Cracked piston Check and replace if necessary.
OIL DRIPPING
Oil seal worn Check and replace if necessary.
EXCESSIVE VIBRATION
IN DELIVERY LINE
Irregular functioning of the valves Check and replace if necessary.
SYSTEM WILL NOT
START
Motor overload tripped Check and reset.
Pressure switch faulty (time delay
only)
Check, clean or replace.
Timer faulty (time delay only) Check and replace.
MOTOR “HUMS” BUT
DOES NOT TURN
Electric motor single phasing Check for blown fuse or loose power line.
SYSTEM WILL NOT
STOP
Pressure switch faulty Check clean or replace.
Timer faulty Check and replace.
SYSTEM STOPS
AFTER
APPROXIMATELY FOUR
(4) SECONDS AND
THEN RESTARTS
Faulty pressure switch Check and replace.
Leak at discharge line Check for leak at hose and spray gun.
MACHINE WILL NOT
START WHEN SPRAY
GUN TRIGGER IS
PULLED
Loss of electrical power Check circuit breaker.
Faulty on/off switch, pressure switch,
timer or magnetic contactor
Test and replace as needed.
MACHINE DOES NOT
TURN OFF AFTER
FOUR (4) SECONDS
WHEN SPRAY GUN IS
RELEASED
Test power control switch and solid
state timer faulty
Replace the defective component.
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