Troubleshooting - Graco 482 Series Instructions-Parts List Manual

WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 7.
Problem
Metering valve fails to dispense
when actuator is tripped.
8 310543

Troubleshooting

1. Relieve the pressure.
2. Check all possible problems and solutions before
Cause
Check nozzle for cured or foreign
fluid.
Observe the action of the needle
valve (7) and the spring (6) through
the vent hole in the valve body (18),
while cycling the valve.
Fluid or air hose is kinked or blocked.
Interrupted fluid supply.
Insufficient operating air pressure.
Worn or damaged parts.
disassembling pump.
Solution
Clean or clear nozzle.
Adjust the piston stroke. Disassemble
and clean the valve, if necessary.
Clear or straighten hose.
Clear supply line.
Check supply and refill if necessary.
Turn on supply pump.
Increase air pressure to 80 psi
(0.55 MPa, 5.5 bar).
Clear air line if blocked.
Disassemble and rebuild the valve.
Lubricate o-rings on installation.