Graco Inc 800-100, 801-191, 2104G manual Problem Cause Solution, Pump

PROBLEM	CAUSE		SOLUTION
Frequent or premature failur	Scoredplungers.		Replace plungers.
of the packing.	Over pressure to inlet manifold.		Reduce inlet pressure
	Damaged or worn plungers.		Replace plungers.
	Abrasive material in the fluid be		Install proper filtration on pump inlet plumbing.
	ing pumped.
	Excessivepressure and/or		:heck	pressures and fluid inlet temperature; be
	temperature of fluid being		jure they are within specified range.
	pumped.
	Over pressure of	pumps.	3educe pressure.
	Running pump dry.		l o not run pump without water.
Strong surging a t the inlet	Foreign particles in the inlet or		:heck	for smooth lap surfaces on inlet 2nd
and low pressure on the	dischargevalve,or	worn inlet	h h a r g e valve seats. Discharge valve seats and
discharge side.	and/or discharge valves.		nlet valve seats may be lapped on a very fine oil
			stone.

NOTE: A M11andM30metricwrenchesare re- quired for servicing pump.

PUMP

Valves

Photo 1 and 2.

1) Removethe hex duo usinoan M30’wrench

2 ) Examine O-ring uide; plug &d replace if evidence of cuts or distortion.

3)Removevalve assembly including retainer, spring, valve and valve seat from valve cavity.

NOTE: Valve assembly maycome apart during removal.

4)Replacevalveparts with service kit(80-041) in- cluding retainer, spring, valve, valve seat, O-ring and back-up-ring.

5)Replace valve cover andtorque to75 ft-lb (100 N.m).

Pumping Section

Photo 3.

1)Removethe four (4) hex nuts from themanifold. 2 ) Separatethemanifold from the crankcase.

NOTE: It may be necessary to tapmanifoldlightly with mallet to loosen.

CAUTION:

plungerswhenremoving to avoid damage to either plungers or seals.

3)Carefully examine each plunger for any scoring and replace if necessary.