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Basic Troubleshooting
44 313316E
Motor runs and pump strokes 1. Prime Valve is open or leaking. Close or replace Prime Valve, page 79.
2. Paint supply. Refill and reprime pump.
3. Intake strainer clogged. Remove and clean, then reinstall.
4. Suction tube leaking air. Tighten nut. Check o-rings on swivel tube.
5. Intake valve ball and outlet ball are
seating properly not worn.
Clean and repair pump, page 77. Strain paint before
using to remove particles that could clog pump.
6. Leaking around throat packing nut
which may indicate worn or damaged
packings.
Replace Pump and Packing module, page 79.
7. Pump rod damaged. Replace Pump and Packing module, page 79.
Motor runs but pump does
not stroke
8. Gears or drive housing. Inspect Drive Housing Assembly and gears for
damage and replace if necessary, page 79.
Motor is hot and runs
intermittently
1. Be sure ambient temperature where
sprayer is located is not more than
115°F (46°C) and sprayer is not
located in direct sun.
Move sprayer to shaded, cooler area if possible.
2. Motor has burned windings indicated
by removing positive (red) brush and
seeing burned adjacent commutator
bars.
Replace Motor, page 39.
Low air output at gun 1. Air valves at gun may be closed. Turn air adjustment valve counter-clockwise to open.
Slide air ON/OFF up to open.
2. Air connections may be loose. Check all connections for leaking air.
Low air output at gun 3. Damaged (leaking) air supply hose. Replace air supply hose.
4. Air intake filter clogged. Clean or replace air intake filter.
Problem
What To Check
(If check is OK, go to next check)
What To Do
(When check is not OK, refer to this column)