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Repair / Réparation / Reparación
313314B 27
Pump output is low 14. O-ring in pump is worn or damaged 14. Replace o-ring; see pump manual 310643.
15. Intake valve ball is packed
with material
15. Clean intake valve; see pump manual 310643.
16. Pressure setting is too low 16. Increase pressure.
17. Large pressure drop in hose
with heavy materials
17. Use larger diameter hose and/or reduce overall
length of hose. Use of more than 100 ft of 1/4 in.
hose significantly reduces performance
of sprayer. Use 3/8 in. hose for optimum
performance (50 ft minimum).
Motor runs but pump does not
stroke
1. Displacement pump pin (32)
damaged or missing; see pump
manual 310643.
1. Replace pump pin if missing. Be sure retainer
spring (31) is fully in groove all around
connecting rod; see pump manual 310643.
2. Connecting rod assembly (43)
damaged; see pump manual
310643.
2. Replace connecting rod assembly; see pump
manual 310643.
3. Gears or drive housing damaged,
page 71.
3. Inspect drive housing assembly and gears for
damage and replace if necessary; see pump
manual 310643.
Excessive paint leakage into
throat packing nut
1. Throat packing nut is loose 1. Remove throat packing nut spacer. Tighten
throat packing nut just enough to stop leakage.
2. Throat packings are worn
or damaged
2. Replace packings; see pump manual 310643.
3. Displacement rod is worn
or damaged
3. Replace rod; see pump manual 310643.
Fluid is spitting from gun 1. Air in pump or hose 1. Check and tighten all fluid connections.
Reduce engine speed and cycle pump
as slowly as possible during priming.
2. Tip is partially clogged 2. Clear tip; see tip guard manual 309640.
3. Fluid supply is low or empty 3. Refill fluid supply. Prime pump; see pump
manual 310643. Check fluid supply often
to prevent running pump dry.
Pump is difficult to prime 1. Air in pump or hose 1. Check and tighten all fluid connections.
Reduce engine speed and cycle pump
as slowly as possible during priming.
2. Intake valve is leaking 2. Clean intake valve. Be sure ball seat is not
nicked or worn and that ball seats well.
Reassemble valve.
3. Pump packings are worn 3. Replace pump packings; see pump manual
310643.
4. Paint is too thick 4. Thin the paint according to the supplier’s
recommendations.
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