Troubleshooting

 

 

 

Problem

Cause

Solution

 

 

 

 

 

 

Displacement pump

Piston ball is not seating.

Service piston ball. Manual 311845.

operates, but output is

 

 

Piston packings are worn or damaged.

Replace packings. Manual 311845.

low on upstroke

 

 

 

 

 

Displacement pump

Strainer (34e) is clogged.

Clean strainer.

operates but output is low

 

 

O-ring in pump is worn or damaged.

Replace o-ring. Manual 311845..

on downstroke and/or on

 

 

Intake valve ball is packed with material or is not

Clean intake valve. Manual 311845..

both strokes.

seating properly.

 

 

 

 

 

 

 

Engine speed is too low.

Increase throttle setting. Manual 313775.

 

 

 

 

Suction tube air leak.

Tighten suction tube.

 

 

 

 

Pressure setting is too low.

Increase pressure. Manual 313775.

 

 

 

 

Fluid filter (11), tip filter or tip is clogged or dirty.

Clean filter. Manual 313775 or 311254.

 

 

 

 

Large pressure drop in hose with heavy materi-

Use larger diameter hose and/or reduce overall

 

als.

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).

 

 

 

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. Reassemble

 

 

valve.

 

 

 

 

Pump packings are worn.

Replace pump packings. Manual 311845.

 

 

 

 

Paint is too thick.

Thin the paint according to the supplier's recom-

 

 

mendations.

 

 

 

 

Engine speed is too high.

Decrease throttle setting before priming pump.

 

 

Manual 313775.

 

 

 

High engine speed at no

Misadjusted throttle setting.

Reset throttle to 3700-3800 engine rpm at no

load.

 

load.

 

 

 

 

Worn engine governor.

Replace or service engine governor.

 

 

 

Low stall or run pressure

New pump or new packings.

Pump break-in period takes up to 100 gallons of

shown on display.

 

material.

 

 

 

 

Faulty transducer.

Replace transducer.

 

 

 

Excessive paint leakage

Throat packing nut is loose.

Remove throat packing nut spacer. Tighten throat

into throat packing nut.

 

packing nut just enough to stop leakage.

 

 

 

 

Throat packings are worn or damaged.

Replace packings. Manual 311845.

 

 

 

 

Displacement rod is worn or damaged.

Replace rod. Manual 311845.

 

 

 

Fluid is spitting from gun.

Air in pump or hose.

Check and tighten all fluid connections. Reprime

 

 

pump. Manual 313775.

 

 

 

 

Tip is partially clogged.

Clear tip. Manual 311254.

 

 

 

 

Fluid supply is low or empty.

Refill fluid supply. Prime pump. Manual 313775.

 

 

Check fluid supply often to prevent running pump

 

 

dry.

 

 

 

313776G

9

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Image 9
Graco 130HS important safety instructions Or worn and that ball seats well. Reassemble
Page 8 Page 10

130HS specifications

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