Graco Inc 231-353, 390sts, 308-548 manual Use AC power or a different generator

Intermediate Problem Solving

TYPE OF PROBLEM	WHAT TO CHECK	WHAT TO DO
	If check is OK, go to next check	When check is not OK, refer to this column
Spray Pattern Variations	1. Spray tip worn beyond sprayer pressure capa-	1. Replace spray tip.
	bility.	NOTE: A smaller size tip will provide
		longer life.

2. Check transducer (29) for wear or damage.

2. Replace transducer. See page 31.

	3.	Check pressure control (64) for smooth opera-	3.	Replace pressure control. See page 30.
		tion.
	4.	Check Low output section, page 16.
Motor Is Hot and Runs	1.	Determine if sprayer was operated at high pres-	1.	Decrease pressure setting or increase tip
Intermittently		sure with small tips, which causes excessive		size.
		heat build up.
	2.	Be sure ambient temperature where sprayer is	2.	Move sprayer to shaded, cooler area if
		located is no more than 90_F (32_C) and		possible.
		sprayer is not located in direct sun.
	3.	Check motor.	3.	Replace motor. See page 26.
Building Circuit Breaker	1.	Check all electrical wiring for damaged insula-	1.	Repair or replace any damaged wiring or
Opens As Soon As Sprayer		tion, and all terminals for loose fit or damage.		terminals. Securely reconnect all wires.
Switch Is Turned On.		Also check wires between pressure control and
		motor. See page 26.
	2.	Check for missing motor brush inspection plate	2.	Correct faulty conditions.
		gasket (see page 18), bent terminal forks or
		other metal to metal contact points which could
		cause a short.
	3.	Check motor armature for shorts. Use an arma-	3.	Replace motor. See page 26.
		ture tester (growler) or perform motor test. See
		page 18. Inspect windings for burns.
	4.	Check motor start board (47) by substituting	4.	Replace board. See page 27.
		with a good board.
		CAUTION: Do not perform this check until
		motor armature is determined to be good. A
		bad motor armature can burn out a good board.
Circuit breaker opens after	1.	Check ‘Basic Problems – Electrical’ on page
sprayer operates for 5 to 10		14.
minutes.
Building circuit breaker	1.	Check ON/OFF switch (52). Be sure sprayer is	1.	Replace ON/OFF switch. See page 27.
opens as soon as sprayer		unplugged! Disconnect wires from switch.
is plugged into outlet and		Check switch with ohmmeter. The reading
sprayer is NOT turned on.		should be infinity with ON/OFF switch OFF,
		and zero with switch ON.
		CAUTION: A short in motor circuit can damage
		switch and or motor start board (47).
	2.	Check electrical supply with volt meter. Meter	2.	If voltage is too high, do not operate
		should read 105–125 VAC.		sprayer until corrected.
Unit will not run on gener-	Check the generator’s peak voltage. This sprayer will		Use AC power or a different generator
ator but does run on AC	not run if the peak voltage is above 190V.
power

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