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Troubleshooting
309977H 11
MOTOR IS HOT AND RUNS INTERMITTENTLY
Low Output continued 13. Low stall pressure. 13. Do either or both:
a. Turn pressure control knob fully clock-
wise. Make sure pressure control
knob is properly installed to allow full
clockwise position.
b. Try a new transducer.
14. Motor armature for shorts by
using an armature tester
(growler) or perform spin test.
See page 13.
14. Replace motor. See page 15.
Motor runs and pump
strokes
1. Material supply 1. Refill hopper and reprime pump.
2. Loose fittings. 2. Tighten; use thread sealant or sealing
tape on threads if necessary.
3. Intake valve ball and piston ball
are seating properly. See page
20.
3. Remove intake and piston valves and
clean. Check balls and seats for nicks or
obstructions; replace if necessary, page
20. Clean hopper before using to remove
particles that could clog pump.
4. Leaking around throat packing
nut which may indicate worn or
damaged packings. See page
20.
4. Replace packing, page 20. Also check pis-
ton valve seat for hardened paint or nicks
and replace if necessary. Tighten packing
nut.
5. Pump rod damage. 5. Repair pump, page 20.
6. Capacitor failure. Visually inspect
capacitor near terminals. Ensure
that orange safety relief plug is
intact.
6. Replace capacitor.
Motor runs but pump does
not stroke
1. Displacement pump pin (75)
(damaged or missing), page 20.
1. Replace pump pin if missing. Be sure
retainer spring (76) is fully in groove all
around connecting rod, page 20.
2. Connecting rod assembly (45) for
damage, page 23.
2. Replace connecting rod assembly, page
23.
3. Gears or drive housing, page 24. 3. Inspect drive housing assembly and gears
for damage and replace if necessary, page
24.
TYPE OF PROBLEM
WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK, refer to this column
Motor is hot and runs inter-
mittently
1. Determine if sprayer was oper-
ated at high pressure with small
tips, which causes low motor
RPM and excessive heat build
up.
1. Decrease pressure setting or increase tip
size.
2. Be sure ambient temperature
where sprayer is located is no
more that 90°F and sprayer is not
located in direct sun.
2. Move sprayer to shaded, cooler area if
possible.
TYPE OF PROBLEM
WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK, refer to this column