PROBLEM
Pump output is low
Excessive paint leakage into throat packing nut
Fluid is spitting from gun
Pump is difficult to prime
CAUSE
Strainer (31) is clogged
Piston ball (25) is not seating
Piston packings are worn or damaged
Intake valve ball is not seating properly
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 damaged
Displacement rod is worn or damaged
Air in pump or hose
Tip is partially clogged
Fluid supply is low or empty
Air in pump or hose
Intake valve is leaking
SOLUTION
Clean strainer
Service piston ball. Manual 308798.
Replace packings. Manual 308798.
Replace
Clean intake valve. manual 308798.
Increase throttle setting. Manual 308867.
Replace clutch. Page 9.
Increase pressure. Manual 308867.
Clean filter. Manual 308867 or 307614.
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 perfor- mance (50 ft minimum).
Remove throat packing nut spacer. Tighten throat packing nut just enough to stop leakage.
Replace packings. Manual 308798.
Replace rod. Manual 308798.
Check and tighten all fluid connections. Reprime pump. Manual 308867.
Clear tip. Manual 307614.
Refill fluid supply. Prime pump. Manual 308867. 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.
Clutch squeaks each time clutch engages
Engine stalls
Pump packings are worn
Paint is too thick
Engine speed is too high
Clutch surfaces are not matched to each other when new and may cause noise
Engine speed is to slow
Fluid filter is clogged
Too much pump friction (new pump)
Spark plug wire is loose
Replace pump packings. Manual 308798.
Thin the paint according to the supplier’s recommendations
Decrease throttle setting before priming pump. Manual 308867.
Clutch surfaces need to wear into each other. Noise will dissipate after a day of run time
DIncrease throttle setting
DAdjust engine speed at no load to 3750 – 3850 rpm
Relieve pressure and clean filter
Reduce pressure to 3000 psi until pump wears in
Reconnect wire
6300