Graco 308652Y Troubleshooting, Internal Air Valve-Operated and Remote Solenoid-Operated Pumps

Troubleshooting

Relieve the pressure before you check or service the equipment.

Check all possible problems and causes before you disassemble the pump.

WARNING

To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 8.

Internal Air Valve-Operated and Remote Solenoid-Operated Pumps

PROBLEM	CAUSE	SOLUTION
The pump cycles at stall, or it fails	The check valves (20) or o-rings	Replace the check valves and/or
to hold pressure at stall.	(21) are leaking.	o-rings. See page 14.
	The check valves (20) are worn.	Replace the check valves.
		See page 14.
	Debris is stuck between the a check	Clean the check valve/seat area.
	valve (20) and the seat.	See page 14.
The pump operates erratically.	The suction line is clogged.	Inspect and clear the line.
	The check valves (20) are sticking	Replace the check valves, or clean
	or leaking.	and check the valve/seat area.
		See page 14.
	A diaphragm (30) is ruptured.	Replace the ruptured diaphragm.
		See page 13.
There are air bubbles in the fluid.	The suction line is loose.	Tighten the suction line.
	A diaphragm (30) is ruptured.	Replace the ruptured diaphragm.
		See page 13.
	The manifold (52) is loose, or the	Tighten the manifold screws (58).
	o-rings (21) are damaged.	Replace the o-rings (21).
		See page 14.
	The fluid covers (51) are loose.	Tighten the fluid cover screws (58).
		See page13.
There is fluid in the exhaust air.	A diaphragm (30) is ruptured.	Replace the ruptured diaphragm.
		See page 13.
	A diaphragm plate (50) is loose.	Tighten the diaphragm plate.
		See page13.
The pump exhausts air near the	The fluid covers (51) are loose, or	Tighten the fluid cover screws (58),
fluid covers.	the o-rings (57) are damaged.	or replace the o-rings. See page13.
The pump exhausts air near the air	The air valve cover screws (14) are	Tighten the screws. See page 12.
valve.	loose.
	The top (5) and/or side (6) air valve	Replace these o-rings.
	o-rings are damaged.	See the Parts Drawing on
		page 17.
The pump leaks fluid from the	The o-rings (21) are leaking, or the	Replace these o-rings, and tighten
check valves.	screws (58) are loose.	the screws. See page 14.

10 308652