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Basic Troubleshooting
313316E 43
Low Fluid Output 1. Worn or clogged spray tip. Relieve pressure, page 21. Replace or clean tip.
Refer to gun instruction manual, 313347.
2. Verify pump does not continue to
stroke when gun trigger is released.
Service Pump, page 77.
3. Prime valve leaking. Relieve pressure, page 21. Then repair Prime Valve,
page 79.
4. Suction hose connections. Tighten any loose connections. Check o-rings on
suction hose tube.
5. Electric supply with volt meter. Meter
must read 105-130 Vac for 110-120
Vac models and 210-255 for 240 Vac
models. Low voltages reduce sprayer
performance.
Reset building circuit breaker; replace building fuse.
Repair electrical outlet or try another outlet.
6. Extension cord size and length. Replace with a correct, grounded extension cord,
page 18.
7. Leads from motor to circuit board for
damaged or loose wire connectors.
Inspect wiring insulation and
terminals for signs of overheating.
Be sure male terminal pins are centered and firmly
connected to female terminals. Replace any loose
terminals or damaged wiring. Securely reconnect
terminals.
8. Worn motor brushes which must be
1/4 in. (6 mm) minimum.
Replace Motor, page 39.
9. Motor brushes binding in brush
holders.
Clean brush holders. Remove carbon dust by using
compressed air to blow out brush dust.
10. Low stall pressure. Turn pressure
control knob fully clockwise.
Replace Pressure Control Assembly, page 79.
11. Motor armature for shorts by using
an armature tester (growler) or
perform spin test, page 73.
Replace Motor, page 39.
12. Pump is primed. Prime pump, page 25.
13. Inlet and outlet balls are not stuck. Inlet: Remove suction tube and place pencil into inlet
housing to dislodge ball and allow proper priming.
Outlet: Insert screwdriver in slot and remove
Easy-Access door, page 17. Unscrew outlet valve
with a 3/4 in. socket. Remove and clean assembly.
Problem
What To Check
(If check is OK, go to next check)
What To Do
(When check is not OK, refer to this column)