Graco 246909 Series C, 253361 Series C Troubleshooting, Problem Cause Solution, Relieve pressure

Troubleshooting

Troubleshooting

Relieve pressure before you check or service any

system equipment.

Problem	Cause	Solution
Pump fails to operate	Inadequate air supply pressure or	Increase air supply and/or clear
	restricted air lines	restriction.
	Closed or clogged pump valves	Open and/or clean.
	Clogged fluid line, hose, valve, or	Relieve pressure.
	other accessory	Clear obstruction.
	Damaged air motor	Assess damage, and service air
		motor.
	Exhausted fluid supply	Refill and reprime or flush.
Continuous air exhaust	Worn or damaged air motor	Assess wear or damage, and service
	gasket or seal	air motor.
Erratic pump operation	Exhausted fluid supply	Refill and reprime or flush.
	Worn pump seals	Replace.
	Damaged shovel tube	Replace.
	Damaged check seat	Replace pump piston or shovel rod
		(or other damaged part).
Errataic or accelerated pump speed	Exhausted fluid supply	Refill and reprime of flush.
	Fluid too heavy for pump priming	Use inductor or follow plate.
	Held open or worn piston valve or	Clear valve; replace seal.
	seal
	Held open or worn intake valve or	Clear valve; replace seal.
	seal.
Pump operates, but output low on up	Worn piston seal	Replace.
stroke	Damaged upper check seat	Replace pump piston.
Pump operates, but output low on	Worn fluid intake seal	Replace.
down stroke	Damaged lower check seat	Replace shovel rod.
Pump operates, but output low on	Inadequate air supply pressure or	Increase air supply and/or clear
both strokes	restricted air lines	restriction.
	Closed or clogged pump valves	Open and/or clean.
	Exhausted fluid supply	Refill fluid supply, and reprime pump.
	Clogged fluid line, hose, valve, or	Relieve pressure.
	other accessory	Clear obstruction.
	Worn seals	Replace.
Grease leaking from muffler plates	Worn throat seal	Replace.

309966H 7