Graco Inc 800-051 Diagnosis and Maintenance, Pumping Section Cutaway, Probable Cause Solution

Page 6

Reassembly

1.Examine inlet valve surface and reverse if damaged. (Both sides are lap surfaces.)

2.Examine piston assembly for clean inlet surface. If damaged, replace and lubricate.

NOTE: CUP INSTALLATION

Wipe cup inserter lightly with oil. Slip backup ring ontopiston. Force cup over inserter and square with all surfaces. Faulty cup installa- tion causes premature failure.

3.Next replace piston spacer and retainer.

4.Slip washer ontorod, screw onnut and torque to60 in-lb. ALWAYS USE NEW COTTERPIN.

5.Examine cylinder wallsforscoring oretching.These conditions will cause prematurewear of piston assemblies. Replace if worn or damaged.

6.Lubricate cylinder and replace O-rings and backup rings (if defective).

7 . Position cylinders in their originalorder into manifold chambers and carefully slipover rod ends onto the

pump.

8.Replace flange nuts onstuds and hand tighten both sides. Then torque each side to 125 in-lb.

9.Hand tighten locking nuts.

PUMPING SECTION CUTAWAY

SEALS AND SLEEVES

Disassembly

1. Remove discharge manifold and piston assemblies as described.

2.Remove both (ME) locking nuts from studs

3.With soft mallet, tap inlet manifold loosefromcrank- case.

4.Place inlet manifold onpair of clearance blocks with crankcase side down, and drive out seals.

5.Invert inlet manifold with CRANKCASE SIDE UP.

6.Lubricate circumference of newPrrrrrm-A-Lube seals, position in manifoldwith GARTER SPRING DOWN and drive into place.

7.Examine sleeves for scoring or other damage before' removing.

8.If worn, grasp sleeve with pliers and pull off.

NOTE:Thisprocedure willmarthesleeveso use only if sleeve is to be replaced.

9.Remove O-ring and backup rings from piston rod.

Reassembly

1 . Place barrier slinger on rod

2.Lubricate new o:rings and backup rings. Install first O-ring in the O-ring groove on the pistonrod. Position backup ring against the shoulder infront of the first O-ring, then the second O-ring. Be careful to avoid damaging the O-rings when slipping them over the piston rod threaded ends.

3.Immerse sleeve in oil, carefully twist and push onto rod. (Machined counter boreend first.)

4.Replace seal retainers.

5.Be careful when replacinginlet manifold, so the in- let seals are not damaged bythe threaded rod ends.

6.Replace locking nuts on studs.

7.Reassemble piston assemblies and discharge mani- fold as described.

Consult factory for your local distributor for crank- case servicing.

DIAGNOSIS AND MAINTENANCE

PROBLEM

PROBABLE CAUSE

SOLUTION

Low pressure

Worn nozzle.

Replace nozzle, of proper size.

 

Belt slippage.

Tighten or replace; use correct belt.

 

Inlet suction strainer clogged.

Clean. Check more frequently.

 

 

.

Worn plunger cups. Abrasives in pumped

Install proper filter.

fluid or severe cavitation. Inadequate

 

water supply.

 

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Contents Model 8OO-051 Series B High Pressure Spray can Cause Serious Injury 412681-6669Operation StartupAccessories Shutdown and Care of UnitDischarge Valves & Valve Seats Pumping Section BE2Diagnosis and Maintenance Probable Cause SolutionPumping Section Cutaway Lhort cup life ~ l u a0-RingLug Problem IrunParts Drawing ServiceGun andHose Assembly 800-017T91Ts Parts Drawing Parts List 801-108Valve kit Chemical Injector KIT Technical DataLimited Warranty Prevents back up of contaminated water into fresh

1204E, 801-238, 800-051 specifications

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