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MANUAL - UG7500W SERIES SPRAY GUN CLEANERS
REVISED 2020-10
TROUBLESHOOTING PROCEDURES PROCEDURE 1
Blocked Fluid Passage In Diaphagm Pump
If the pump sounds like it is working but liquid does not flow, clear the
fluid passage as follows:
•
Remove suction tube from the pail and blow air at 85 PSI into
the INLET Liquid Hose (see diagram). Step on foot pedal to
activate pump. This procedure may have to be repeated several
times. If this procedure does not help, blow some water into the
suction hose using a spray gun, wait one minute and step on foot
pedal to activate pump. This procedure may have to be repeated
several times. If this procedure does not work, the pump must be
replaced.
If you need to replace the pump log-on to Service Channel and
Fixxbook or call the Uni-ram Service Engineer.
The warranty on the diaphragm pump is two years from date of pur-
chase.
This procedure will also clear a blockage in the fluid line for the brush. Follow the same procedure to clear a
blockage in the automatic nozzle except turn the timer instead of stepping on the foot pedal.
PROCEDURE 2
Blocked Air Passage In Diaphragm Pump
If there is a steady hissing sound and the pump is not cycling, the
spool valve has stalled due to a blocked air passage. Follow the
procedure below to clear the blockage.
•
Connect a blow gun to an 85 PSI source. Locate the blue
hose that extends from the air exhaust port of the dia-
phragm pump. Use a blow gun to blow air into the open
end of this hose. Turn timer. If the procedure is successful,
the pump will start working. The procedure may have to
be repeated several times. If this procedure does not work,
replace the pump.
•
Cause:
Contaminants in the air supply (water, oil, solid
particles etc)
•
Preventative Action:
If necessary, install an Airline
(Moisture) Filter.
PROCEDURE 3
Blocked Passage in Air Line
The components in the air line are the
diaphragm pump, air valve, foot pedal, 3-way ball valve and
regulator. See the Flow Diagram and the section: Replacement Parts.
To troubleshoot a component:
1) Disconnect the air line to the component using the quick disconnect.
2) Step on foot pedal and check for presence of positive air pressure in the air line. If there is ample positive air
pressure, replace the component.
If air pressure is absent, there is a faulty component upstream. Reconnect the air line and check the operation of
the next component upstream by following steps 1 and 2 above.
