Graco Inc. ti12077a ユーザーズマニュアル

Motor runs and pump 
strokes

1.

Prime Valve Open.

Close prime valve.

2.

Paint supply.

Refill and reprime pump.

3.

Intake strainer clogged.

Remove and clean, then reinstall.

4.

Suction hose leaking air.

Tighten nut. Check o-rings on swivel.

5.

Intake valve ball and piston ball 
are seating properly.

See Pump Manual 309250. Strain paint before 
using to remove particles that could clog pump.

6.

Leaking around throat packing 
nut which may indicate worn or 
damaged packings.

See Pump Manual 309250.

7.

Pump rod damaged.

See Pump Manual 309250.

Motor runs but pump does 
not stroke

1.

Displacement pump pin dam-
aged or missing.

Replace pump pin if missing. Be sure retaining 
spring is fully in groove all around connecting 
rod. See page 14, Displacement Pump 
Replacement.

2.

Connecting rod assembly for 
damage.

Replace connecting rod assembly. See page 
14, Displacement Pump Replacement.

3.

Gears or drive housing.

Inspect drive housing assembly and gears for 
damage and replace if necessary. See page 16, 
Drive Housing Replacement.

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 indi-
cated by removing positive (red) 
brush and seeing burned adja-
cent commutator bars.

Replace motor. See page 27, Motor 
Replacement.

3.

Tightness of pump packing nut. 
Overtightening tightens packings 
on rod, restricts pump action and 
damages packings.

Loosen packing nut. Check for leaking around 
throat. Replace pump packings if necessary. 
See pump manual 309250.