Troubleshooting - Graco Mark X 240 Volt 255914 Instructions

Troubleshooting

PROBLEM
Low or No Fluid/Pressure Output
Motor runs but pump does not stroke
32
Do Pressure Relief; page 28.
Mechanical/Fluid Flow
CAUSE
1 Spray tip worn.
2 Spray tip clogged.
3 Material supply.
4 Intake strainer clogged.
5 Intake valve ball and piston ball are not
seating properly.
6 Filter clogged.
7 Prime valve leaking
8 Verify pump does not continue to stroke
when gun trigger is released.
(Prime valve not leaking.)
9 Leaking around throat packing nut which
may indicate worn or damaged packings.
See page 44.
10 Pump rod damage.
11 Low stall pressure.
1 Displacement pump pin damaged
or missing, page 44.
2 Connecting rod assembly damaged,
page 50.
3 Gears or drive housing damaged,
page 50.
Troubleshooting
SOLUTION
1 Follow Pressure Relief Procedure
Warning, then replace tip. See your
separate gun or tip manual.
2 Relieve pressure. Check and clean spray
tip.
3 Refill and reprime pump.
4 Remove and clean, then reinstall;
or do not use strainer.
5 Remove intake valve and clean. Check
balls and seats for nicks; replace if
necessary, page 44. Strain paint before
using to remove particles that could clog
pump.
6 Relieve pressure. Check and clean filter;
or do not use filter.
7 Relieve pressure. Repair prime valve.
8 Service pump. See page 44.
9 tReplace packings, page 44. Also check
piston valve seat for hardened paint or
nicks and replace if necessary. Tighten
packing nut/wet-cup.
10 Repair pump, page 44.
11 Do either or both:
a Turn pressure control knob fully
clockwise. Make sure pressure control
knob is properly installed to allow full
clockwise position.
b Try a new pressure transducer.
1 Replace pump pin if missing. Be sure
retainer spring is fully in groove all around
connecting rod, page 44.
2 Replace connecting rod assembly,
page 50.
3 Inspect drive housing assembly and
gears for damage and replace if
necessary, page 50.
312649H