Graco Inc. 3A0243A ユーザーズマニュアル

Pump output is low

Strainer is clogged.

Clean strainer. 

Piston ball is not seating.

Service piston ball (see pump manual).

Piston packings are worn or damaged.

Replace packings (see pump manual).

O-ring in pump is worn or damaged.

Replace o-ring (see pump manual).

Intake valve ball is not seating properly. Clean intake valve (see pump manual).

Intake valve ball is packed with mate-
rial.

Clean intake valve (see pump manual).

Engine speed is too low.

Increase throttle setting (see operation man-
ual).

Clutch is worn or damaged.

Adjust or replace clutch. Page 17.

Pressure setting is too low.

Increase pressure (see operation manual).

Fluid filter, tip filter or tip is clogged or 
dirty.

Clean filter (see gun manual).

Large pressure drop in hose with heavy 
materials.

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).

Excessive paint leakage into throat 
packing nut

Throat packing nut is loose.

Remove throat packing nut spacer. Tighten 
throat packing nut just enough to stop leakage.

Throat packings are worn or damaged.

Replace packings (see pump manual).

Displacement rod is worn or damaged.

Replace rod (see pump manual).

Fluid is spitting from gun

Air in pump or hose.

Check and tighten all fluid connections. Rep-
rime pump (see operation manual).

Tip is partially clogged.

Clear tip (see gun manual).

Fluid supply is low or empty.

Refill fluid supply. Prime pump (see operation 
manual). Check fluid supply often to prevent 
running pump dry.

Pump is difficult to prime

Air in pump or hose.

Check and tighten all fluid connections.

Reduce engine speed and cycle pump as 
slowly as possible during priming.

Intake valve is leaking.

Clean intake valve. Be sure ball seat is not 
nicked or worn and that ball seats well. Reas-
semble valve.

Pump packings are worn.

Replace pump packings (see pump manual).

Paint is too thick.

Thin the paint according to the supplier's rec-
ommendations.

Engine speed is too high.

Decrease throttle setting before priming pump 
(see operation manual).

Clutch squeaks each time clutch 
engages

Clutch surfaces are not matched to 
each other when new and may cause 
noise.

Clutch surfaces need to wear into each other. 
Noise will dissipate after a day of run time.

High engine speed at no load

Misadjusted throttle setting.

Reset throttle to 3300 engine rpm at no load.

Worn engine governor.

Replace or service engine governor.

Gallon counter not working

Bad sensor, broken or disconnected 
wire. Displaced or missing magnet.

Check connections. Replace sensor or wire. 
Reposition or replace magnet.

No display, sprayer operates

Display damaged or has bad connec-
tion.

Check connections. Replace display.