Graco GMax 233700 Instruction & Repair Manual page 7

PROBLEM
Pump output is low
Excessive paint leakage into
throat packing nut
Fluid is spitting from gun
Pump is difficult to prime
Clutch squeaks each time
clutch engages
High engine speed at no
load load
Gallon counter not working
No display, sprayer operates
CAUSE
Strainer (31) is clogged
Piston ball (206) is not seating
Piston packings are worn or damaged
O-ring (227) in pump is worn or damaged
Intake valve ball is not seating properly
Intake valve ball is packed with material
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
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
Misadjusted throttle setting
Worn engine governor
Bad sensor, broken or disconnected wire.
Displaced or missing magnet.
Display damaged or has bad connection
SOLUTION
Clean strainer. Sprayer 233716 strainer is for
use in paint only.
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 309408.
Replace clutch. Page 10.
Increase pressure. Manual 309408.
Clean filter. Manual 309408 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 309277.
Replace rod. Manual 309277.
Check and tighten all fluid connections.
Reprime pump. Manual 309408.
Clear tip. Manual 309091.
Refill fluid supply. Prime pump. Manual
309408. 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.
Thin the paint according to the supplier's
recommendations
Decrease throttle setting before priming pump.
Manual 309408.
Clutch surfaces need to wear into each other.
Noise will dissipate after a day of run time.
Reset throttle to 3700 engine rpm at no load
Replace or service engine governor
Check connections. Replace sensor or wire.
Reposition or replace magnet.
Check connections. Replace display.
309409 7