MANUAL - SPRAY GUN CLEANERS - UG7500 SERIES
REVISION 2011-05
12
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 Sovent Hose (see diagram). Step on foot pedal. This
procedure may have to be repeated several times. If this pro-
cedure does not help, blow some water into the suction hose
using a spray gun, wait one minute and step on foot pedal.
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 call your local dealer. The warran-
ty
on the diaphragm pump is two years from date of purchase.
This procedure will also clear a blockage in the fluid line for the wash gun.
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 parti-
cles
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 regu-
lator. 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.
