Graco Presiden 237 Instructions-Parts List Manual page 9

Troubleshooting
.
INJECTION
HAZARD
To reduce the risk of serious bodily
injuiy, including fluid injection or splash-
ing in the eyes or on the skin, always
follow the Pressure Relief Procedure on page
8
whenever you shut off the pump, when checking or
servicing any part of the system, when installing or
changing dispensing devices, and whenever you
stop dispensing.
Problem Solution Cause
Pump fails to operate
I
Inadequate air supply pressure or
I
Increase air supply; clear
Continuous air exhaust
restricted air lines
valve
Closed or clogged dispensing
Clear' Clogged fluid lines, hoses, valves,
Open; clean
etc.
Damaged air motor Service air motor
Exhausted fluid supply Refill and reprirne or flush
Wom or damaged air motor gas- Service air motor
ket, packing, seal, etc.
-
I
Erratic pump operation
Exhausted fluid supply
1
Refill and reprime or flush
Held oDen or worn intake valve or
1
Clear: sewice
I
piston backings
Pumo oDerates. but outout low on
I
Held oDen Diston valve or worn
I
Clear: service
up siroie
down stroke
Held open or worn intake valve
Pump operates, but output low on
piston pacings
restricted air lines both strokes
Increase air supply; clear Inadequate air su
Clear; sewice
Closed or clogged valves Open; clean
*
Follow the Pressure Relief Procedure on page 8. and disconnect the fluid line.
If
the pump starts when
the air is tumed on again, the line, hose, valve, etc., is clogged.
308-485 9