Graco TI3840a important safety instructions Troubleshooting, See Clean Purge Rod

Troubleshooting

Troubleshooting

1.

2.

Follow Pressure Relief Procedure, page 18,

before checking or repairing gun.

Check all possible problems and causes before

disassembling gun.

CAUTION

To prevent cross-contamination of the gun’s wetted parts, do not interchange A component (isocyanate) and B component (resin) parts.

PROBLEM	CAUSE	SOLUTION
Gun does not fully actuate when trig-	Piston safety lock engaged.	Disengage piston safety lock, page
gered.		12.
	Plugged muffler (22).	Clean, page 22.
	Damaged air valve o-rings (24).	Replace, page 44.
Fluid does not spray when gun is fully	Closed fluid valves (12b).	Open.
actuated.
	Plugged impingement ports.	Clean, page 23.
	Plugged check valves (36).	Clean, page 41.
Gun actuates slowly or with delayed	Plugged muffler (22).	Clean, page 22.
action. Mixed material spits out end
	Damaged piston o-rings (16, 19).	Replace, page 42.
of gun after de-triggering.
	Dirty air valve, or damaged o-rings	Clean air valve or replace o-rings,
	(24).	page 44.
	Mix module nut (25) too tight.	Loosen nut, then retighten, page 37.
	Incorrect purge rod adjustment.	Adjust Purge Rod, page 15.
	Loose lock ring (11).	Tighten, use tool if necessary. Adjust
		Purge Rod, page 15.
Purge rod will not actuate.	No air pressure.	Connect air supply.
	Low air pressure.	Set air pressure above 80 psi (0.56
		MPa, 5.6 bar).
	Buildup on purge rod (31).	See Clean Purge Rod, page 27.

30 309856U