Graco Inc D 5 5, 716, D 5 D, D 5 B, D 5 E, D 5 A, D 5 3 Troubleshooting, Problem, Cause, Solution

Troubleshooting

Read Pressure Relief Procedure on page 10, and relieve the pressure before you check or service the equipment. Check all possible problems and causes before disassembling the pump.

PROBLEM	CAUSE	SOLUTION
Pump will not cycle, or cycles once	Air valve is stuck or dirty.	Use filtered air.
and stops.
Pump cycles at stall or fails to hold	Leaky check valves or o-rings.	Replace.
pressure at stall.
	Worn check balls or duckbill valves	Replace.
	or guides.
	Check ball wedged in guide.	Repair or replace.
	Worn diaphragm shaft seals.	Replace.
Pump operates erratically.	Clogged suction line.	Inspect; clear.
	Sticky or leaking check valve balls.	Clean or replace.
	Diaphragm ruptured.	Replace.
Air bubbles in fluid.	Suction line is loose.	Tighten.
	Diaphragm ruptured.	Replace.
	Loose manifolds or damaged man-	Tighten manifold bolts or nuts; re-
	ifold o-rings.	place o-rings.
	Loose fluid side diaphragm plates.	Tighten.
Fluid in exhaust air.	Diaphragm ruptured.	Replace.
	Loose fluid side diaphragm plates.	Tighten.
	Worn diaphragm shaft seals.	Replace.
Pump exhausts air from clamps	Loose clamps.	Tighten clamp nuts.
(metal pumps).
	Air valve o-ring is damaged.	Inspect; replace.
Pump leaks fluid from check valves.	Worn or damaged check valve	Inspect; replace.
	o-rings.

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