Troubleshooting - Graco LineLazer II 3900 Instructions-Repair

INJECTION HAZARD
To reduce risk of serious injury, including fluid injection or splashing in eyes or on skin, or injury from
moving parts, always follow Pressure Relief Procedure Warning, page 5, before checking, adjust-
ing, cleaning or shutting down sprayer. Disconnect spark plug!
Check everything in chart before disassembling sprayer.
PROBLEM
Engine won't start
Engine operates, but dis-
placement pump does not placement pump does not
operate.

Troubleshooting

WARNING
CAUSE
Engine switch is OFF
Engine is out of gas
Engine oil level is low
Spark plug cable is disconnected or damaged
Cold engine
Fuel shutoff lever is OFF
Oil is seeping into combustion chamber
Pressure control switch is OFF.
Pressure setting is too low.
Fluid filter (318) is dirty .
Tip or tip filter is clogged.
Displacement pump piston rod is stuck due to
dried paint.
Connecting rod is worn or damaged.
Drive housing is worn or damaged.
Electrical power is not energizing field.
Clutch is worn, damaged, or incorrectly
positioned.
Pinion assembly is worn or damaged.
SOLUTION
Turn engine switch ON
Refill gas tank. Honda Engines Owner's Manual.
Try to start engine. Replenish oil, if necessary .
Honda Engines Owner's Manual.
Connect spark plug cable or replace spark
plug
Use choke
Move lever to ON position
Remove spark plug. Pull starter rope 3 or 4
times. Clean or replace spark plug. Try to start
engine. Keep sprayer upright to avoid oil seep-
age.
Turn pressure control switch ON.
Turn pressure adjusting knob clockwise to
increase pressure.
Clean filter. See page 25.
Clean tip or tip filter. See gun instruction
manual.
Repair pump. See manual 308798.
Replace connecting rod. See page 8.
Replace drive housing. See page 9.
Check wiring connections. See page 12.
Reference control board diagnostics. Page 15.
(LL 3900); 1.7 0.2Ω (LL 5900); if not, replace
pinion housing.
Check control board fuse. If blown, replace
with equivalent automotive fuse.
Have pressure control checked by authorized
Graco dealer.
Replace clutch. See page 10.
Repair or replace pinion assembly, see pg 10.
1.2 0.2Ω