Troubleshooting

		Troubleshooting

Problem	Cause	Solution


Gun spitting.	Air getting into paint stream.	Check if fluid source is empty
		and fill.
		Tighten fluid nozzle (11).
		Check and tighten needle
		packing nut (9a).
		Check fluid nozzle (11) for
		damage.

Will not spray.	Fluid control valve (8) turned	Adjust fluid control valve (8)
	too far clockwise.	counterclockwise.

	Fluid source empty.	Refill.

Excessive air blowing back.	Loose fluid nozzle (11).	Tighten fluid nozzle (11).

	Damaged fluid nozzle seal	Replace seal (19).
	(19).

Excessive air leak behind	Worn u-cups/air valve.	Repair gun (Kit 289407). Be
trigger.		sure to use all included parts.

	Worn trigger.	Replace trigger (part 289140).
		If leak persists repair gun (Kit
		289407).

Gun fluid pressure is too high	Using needle/nozzle kit with	Use needle/nozzle kit with
with gun triggered (cannot	too small orifice.	larger orifice.
achieve desired flow rate).

Using a low fluid pressure set-	Using needle/nozzle kit with	Use needle/nozzle kit with
ting, the fluid flow is too high,	too large orifice.	smaller orifice.
making it necessary to restrict
needle travel to reduce fluid
flow.

Fluid system will not operate at	There is no fluid regulator, or	Add low pressure fluid regula-
low enough pressure [below	air regulator is not sensitive	tor, or add more sensitive low
10 psi (70 kPa, 0.7 bar)].	enough at low pressure.	pressure air regulator.

Fluid flow is fluttering while	Fluid filter clogged.	Check fluid filter.
spraying.
spraying.	Fluid source empty.	Refill.

Fluid flow fades while spraying	Air hose size is too restricted	Use 5/16 in. (7.9 mm) I.D. air
high viscosity fluids.	for higher air flow being used.	hose if the hose is 25 ft (7.6 m)
		long. If longer hose is needed,
		use a 3/8 in. (9.5 mm) I.D.
		hose.

312414J

Problem