![background image](http://html.mh-extra.com/html/graco/xm-pfp/xm-pfp_setup-and-operation_2251612064.webp)
Troubleshooting Information
64
3A2776K
Metering pumps do not run when Run
Mode is selected and the blue LED is illu-
minated.
Air pressure to metering pumps too low
Increase pressure to 50 psi (0.35 MPa,
3.5 bar) or greater.
Air pressure to metering valves is too low. Check air regulator behind main air
panel. Should be 80-85 psi
(0.55-0.59 MPa, 5.5-5.9 bar).
Circulation valves or mix manifold ball
valves are not open.
Open ball valves.
Air pilot lines are obstructed
Check pilot lines for kinks or pinches.
Solenoid valve stuck.
Actuate solenoid manually, if it does not
operate, replace solenoid. See the XM
PFP repair manual.
Air pilot valve(s) to motor stuck.
Replace valve(s). See XM PFP repair
manual.
Metering valve(s) not opening.
Service or replace valve(s). See XM PFP
repair manual.
Air motor stalled.
See manual 3A5423.
Pump Test completes without error, but A
or B component has more than 750cc of
fluid in beaker.
Incorrect metering pumps were selected
in System Setup screens.
Appendix A - User Interface Dis-
beginning on page 67.
Air is trapped in fluid due to excessive
agitation, circulation, and heat. Fluid is
measured by volume when it is com-
pressed under pressure.
Repeat Pump Test with fresh fluid.
If the specific gravity of each fluid is
known, check samples by weight (750cc
x specific gravity equals weight in grams).
If weight is correct, extra volume in bea-
ker is air.
Batch Test completes without error, but A
or B component has more fluid in beaker
than displayed on screen.
See causes for previous pump test prob-
lem.
See solutions for previous pump test
problem.
Sprayer does not start when start button
is pressed.
Faulty start switch or wire harness.
Check start switch and wiring harness
continuity; switch is normally open circuit.
See Electrical Schematics in the XM PFP
repair manual.
Faulty stop switch or wiring harness.
Check stop switch and wiring harness
continuity; stop switch is normally closed
circuit. See Electrical Schematics in the
XM PFP repair manual.
Fluid valves leaking at rod.
Loose or worn packings.
Tighten packing nut. If leak continues,
replace packings.
Fluid valve leaking between main and
outlet housings.
O-ring on seat has failed.
Replace both o-rings on that seat.
Material does not cure consistently.
Ratio not set correctly.
Check that correct ratio is set and set by
volume.
Material not mixing correctly.
Test metering pump. Make sure mixer is
clean; flush as needed.
Position mixer after integrator hose.
Material not properly conditioned before it
was added to sprayer.
Mix material thoroughly.
Not using enough integration hose.
Add more integration hose.
Select “fast dosing” in setup.
Problem
Cause
Solution