Graco 308738C manual Troubleshooting, Problem, Cause, Solution

Page 10
Troubleshooting

Troubleshooting

Problem WARNING

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

1.Relieve the pressure.

2.Check all possible problems and solutions before disassembling pump.

Problem

Cause

Solution

 

 

 

Pump fails to operate.

Restricted line or inadequate air

Clear; increase air supply.

 

supply.

 

 

 

 

 

Insufficient air pressure; closed or

Open; clean (be sure to use air fil-

 

clogged air valves, etc.

ter).

 

 

 

 

Exhausted fluid supply.

Refill; purge all air from pump and

 

 

fluid lines.

 

 

 

 

Damaged air motor.

Service air motor. See manual

 

 

306982.

 

 

 

 

Fluid intake or piston valve needs

Adjust. See manual 307044.

 

adjustment.

 

 

 

 

Pump operates but output is low on

Restricted line or inadequate air

Clear; increase air supply.

both strokes.

supply.

 

 

 

 

 

Insufficient air pressure; closed or

Open; clean (be sure to use air

 

clogged air valves, etc.

filter).

 

 

 

 

Exhausted fluid supply.

Refill; purge all air from pump and

 

 

fluid lines.

 

 

 

 

Clogged fluid line, valves, etc.

Clear*.

 

 

 

 

Loose packing nut or worn throat

Tighten packing nut (see page 8);

 

packings.

replace throat packings.

 

 

 

 

Damaged riser tube o-rings.

Replace. See manual 307044.

 

 

 

Pump operates but output is low on

Held open or worn intake valve.

Clear; service. See manual 307044.

downstroke.

 

 

 

 

 

 

Damaged riser tube o-rings.

Replace. See manual 307044.

 

 

 

Pump operates but output is low on

Held open or worn fluid piston valve

Clear; service. See manual 307044.

upstroke.

or packings.

 

 

 

 

Erratic or accelerated operation.

Exhausted fluid supply.

Refill; purge all air from pump and

 

 

fluid lines.

 

 

 

 

Held open or worn intake valve.

Clear; service. See manual 307044.

 

 

 

 

Held open or worn fluid piston valve

Clear; service. See manual 307044.

 

or packings.

 

 

 

 

 

Damaged riser tube o-rings.

Replace. See manual 307044.

 

 

 

*To determine if the fluid hose or gun is obstructed, relieve the pressure and disconnect the fluid hose, and place a container at the pump fluid outlet to catch any fluid. Turn on the air just enough to start the pump; about 1.4 to 2.8 bar (0.14 to 0.28 MPa, 20 to 40 psi). If the pump starts when the air is turned on, the obstruction is in the fluid hose or gun.

10 308738

Image 10
Contents 10 1 Ratio Presidentr Pump Instructions - Parts ListPart No. 239326, Series A 308738CWarning Symbol Table of ContentsSymbols Caution SymbolMOVING PARTS HAZARD INJECTION HAZARDcal attention FIRE AND EXPLOSION HAZARD TOXIC FLUID HAZARDPrepare the Site InstallationPrepare the Operator Mounting the PumpInstallation Typical Installation6308738 F G E D C K Y H A J BSystem Accessories InstallationOperation Pressure Relief ProcedureStarting and Adjusting the Pump Flush the Pump Before First UseOperation Shutdown and Care of the PumpFlushing the Pump COMPONENT RUPTURE HAZARDSolution TroubleshootingProblem CauseDisconnecting the Displacement Pump ServiceReconnecting the Displacement Pump Part PartsPart No. 239326, Series A DescriptionDimension DimensionsMeasurement Sound Power Levels dBa Technical Datatested in accordance with ISO 308738 Performance ChartTechnical Data cycles per minuteFOR GRACO CANADA CUSTOMERS The Graco Standard WarrantyGraco Information Sales Office Minneapolis