Graco GMax 232624 Instructions-Parts List Manual page 6

PROBLEM
Pump output low
Excessive paint leakage into
throat packing nut
Spitting from gun
Pump is difficult to prime
High engine speed at no
load
Clutch squeaks each time
clutch engages
6
308864
CAUSE
Strainer (31) clogged
Piston ball (25) not seating
Piston packings worn or damaged
O-ring (227) in displacement pump is worn or
damaged
Intake valve ball not seating properly
Engine speed is too low
V--belt slipping
Clutch 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 worn or damaged
Displacement rod worn or damaged
Air in fluid pump or hose
Tip partially clogged
Fluid supply is low or empty
Air leak
Intake valve is leaking
Worn packings
Fluid is too thick
Engine speed is too high
Misadjusted throttle setting.
Worn engine governor
Clutch surfaces are not matched to each other
when new and may cause noise
SOLUTION
Clean.
Service piston ball check. Manual 308798.
Replace packings. Manual 308798.
Replace o-ring. Manual 308798.
Clean and service. Manual 308798.
Increase throttle setting. See Manual 308863.
Tighten V--belt with clamp (101). Adjust clamp
until it takes 15 lb of force to lock clamp down.
Replace. See page 9.
Increase pressure. Manual 308863.
Clean filter. Manual 308863 or 309091.
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 for loose connections at pump intake
and tighten. Then prime pump. See Startup,
Manual 308863.
Clear.
Refill and prime pump. See Startup, Manual
308863. Check fluid supply often to prevent
running pump dry.
Check all hose connections and tighten as
needed.
Reduce engine speed and cycle pump as
slowly as possible during priming.
Shut off pump and relieve pressure. Disas-
semble and clean intake valve. Be sure ball
seat is not nicked or worn and that ball seats
well. Reassemble.
Repack pump. Manual 308798.
Thin fluid according to supplier's recommenda-
tions.
Decrease throttle setting before priming pump.
Manual 308863.
Reset engine throttle to 3600 -- 3800 rpm at no
load
Replace or service engine governor
Clutch surfaces need to wear into each other.
Noise will dissipate after a day of run time