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Troubleshooting
Problem
Display does not activate or is show-
ing unintelligible characters
Slow or no fluid flow
Fluid leaks from swivel (101)
Fluid flow does not stop when valve
is closed
Fluid leaks from trigger barrel seals
Trigger lock on/off feature does not
work
3A8307D
1. Follow Pump: follow manufacturer's
2. Check all possible problems and causes before
Cause
Electronic control is malfunctioning
Two or more batteries are installed
with incorrect polarity.
Batteries in electronic control are
depleted
Strainer (32) is clogged.
Pump pressure is low.
Shut off valve is not fully open.
Foreign material is jammed in the
meter element.
Swivel (33) is loose.
Damaged or worn o-ring(s) (PN
105765) (Reference item 33, Notes:,
page 19)
Worn valve seat (30)
Damaged or worn o-ring(s) (24)
Damaged trigger components
recommendations., page 7, before checking or
repairing the dispensing valve.
disassembling the dispensing valve.
Replace electronic control. Order
PM8/20 Electronics Kit. Kit includes
electronic control, seal and mounting
screws.
Check the polarity of all four (4) bat-
teries, and correct if necessary.
Replace batteries.
Clean or replace strainer (32).
Increase pump pressure.
Fully open shut off valve.
Contact your local Graco distributor
for repair or replacement.
Torque the swivel (33) to 15 to 20
ft-lbs (20 to 27 N•m).
If the problem remains, contact your
Graco distributor for repair or
replacement.
Replace the o-rings (PN 105765) and
torque the swivel (33) to 15-20 ft-lbs
(20 to 27 N•m).
If the problem remains, contact your
Graco distributor for repair or
replacement.
Replace valve seat (30).
Rebuild valve using valve kit 18F174
for oil and gear lube models, 18F175
for anti-freeze models.
Replace o-rings (24).
Rebuild valve using valve kit 18F174
for oil and gear lube models, 18F175
for anti-freeze models.
Replace trigger assembly. Order
PM8/20 Trigger Kit (18F172).
Troubleshooting
Solution
17
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