Graco PR70e, Instructions Manual

Page: 37 / 70

Troubleshooting
334135B 37
Troubleshooting
Before starting any troubleshooting procedures, perform
the following procedure.
1. Relieve pressure. See Pressure Relief Procedure ,
page 33.
2. Disconnect AC power from the machine.
3. Allow the machine to cool if the machine has a heat
control option.
Try the recommended solutions in the order given for
each problem to avoid unnecessary repairs. Verify all
circuit breakers, switches, and controls are properly set
and wiring is correct.
Problem Cause Solution
Display Module completely dark No power Verify cable is plugged in.
Verify rear AC Power switch is ON.
Loose connection Tighten all cables on Display Module.
Bad display module Replace Display Module.
No or incorrect amount of material
dispensed from either side. Tank empty Fill tank with material.
Tank clogged Verify no obstruction in the tank.
Air in material Prime the machine until the air is
removed.
Check valve malfunction Remove; clean or replace check
valve.
Piston worn or broken Remove and replace piston if worn.
Piston stalled Input air reduced or removed Reconnect input air line to machine.
Increase air pressure regulator
adjustment.
Mixer blocked Replace static mixer.
Open Dispense Valve (ODV) adjust-
ment too late Readjust the ODV setting to occur
sooner.
Blocked check valve Remove check valve; clean and
replace.
Air cylinder failure Remove air cylinder and reinstall air
cylinder parts as necessary.
Significant material leaking from
pump rear seal Pump shaft worn and/or shaft seal
worn Remove pump shaft assembly, and
reinstall rear pump rebuild kit.
Material dispensed not correct vol-
ume Machine air pressure has changed
since calibration. Readjust air pressure regulator to
value used when machine was cali-
brated, or recalibrate machine.
Not enough material in one or more
tanks Check tank levels; fill and prime as
necessary.
Mixer has slight obstruction Replace static mixer. Prime machine.
Check valve malfunction Remove check valve; clean or
replace as necessary.
Piston worn or broken Replace piston.