Graco A Series Instructions-Parts List Manual page 10

Troubleshooting
PROBLEM
Engine operates, but dis-
placement pump does not
operate continued
Pump output is low
Excessive paint leakage into
throat packing nut
Fluid is spitting from gun
Pump is difficult to prime
10
CAUSE
Clutch is worn, damaged, or incor-
rectly positioned
Pinion assembly is worn or damaged Repair or replace pinion assembly. Manual
Strainer (31) is clogged
Piston ball (206) is not seating
Piston packings are worn or dam-
aged
O-ring (227) in pump is worn or dam-
aged
Intake valve ball is not seating prop-
erly
Intake valve ball is packed with mate-
rial
Engine speed is too low
Clutch is worn or damaged
Pressure setting is too low
Fluid filter (318), tip filter or tip is
clogged or dirty
Large pressure drop in hose with
heavy materials
Throat packing nut is loose
Throat packings are worn or dam-
aged
Displacement rod is worn or dam-
aged
Air in pump or hose
Tip is partially clogged
Fluid supply is low or empty
Air in pump or hose
Intake valve is leaking
Pump packings are worn
SOLUTION
Replace clutch. Manual 309890.
309890.
Strainer (31) is clogged
Service piston ball. Manual 309277.
Replace packings. Manual 309277.
Replace o-ring. Manual 309277.
Clean intake valve. Manual 309277.
Clean intake valve. Manual 309277. Do not
leave 233716 sprayer under pressure for more
than 5 minutes when spraying texture and not
actively spraying.
Increase throttle setting. Manual 309413.
Replace clutch. Manual 309890.
Increase pressure. Manual 309413.
Clean filter. Manual 309413 or 309093.
Use larger diameter hose and/or reduce over-
all 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 per-
formance (50 ft minimum).
Remove throat packing nut spacer. Tighten
throat packing nut just enough to stop leak-
age.
Replace packings. Manual 309277.
Replace rod. Manual 309277.
Check and tighten all fluid connections. Rep-
rime pump. Manual 309413.
Clear tip. Manual 309093.
Refill fluid supply. Prime pump. Manual
309413. Check fluid supply often to prevent
running pump dry.
Check and tighten all fluid connections.
Reduce engine speed and cycle pump as
slowly as possible during priming.
Clean intake valve. Be sure ball seat is not
nicked or worn and that ball seats well. Reas-
semble valve.
Replace pump packings. Manual 309277.
309414N