Graco Inc 308639L important safety instructions Troubleshooting, Problem Cause Solution

Page 11

Troubleshooting

WARNING

To reduce the risk of serious injury, including splashing fluid in the eyes or on the skin, follow the Pressure Relief Procedure on page 9. You must do this whenever this manual instructs you to relieve pressure, when you shut off the pump, and before checking, adjusting, cleaning, moving, or repairing any system equipment.

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

PROBLEM

CAUSE

SOLUTION

Pump cycles at stall or fails to hold pres-

Worn check valve balls (201), seats

Replace. See page 14.

sure at stall.

(101) or o-rings (102).

 

 

 

 

Pump will not cycle, or cycles once and

Air valve is stuck or dirty.

Disassemble and clean air valve. See

stops.

 

pages 12 to 13. Use filtered air.

 

 

 

 

Check valve ball (201) severely worn

Replace ball and seat. See page 14.

 

and wedged in seat (101) or manifold

 

 

(50 or 53).

 

 

 

 

 

Check valve ball (201) is wedged into

Install a pressure relief valve

 

seat (101), due to overpressurization.

(see page 7).

 

 

 

 

Dispensing valve is clogged.

Relieve pressure and clear valve.

 

 

 

Pump operates erratically.

Suction line is clogged.

Inspect; clear.

 

 

 

 

Sticky or leaking check valve balls

Clean or replace. See page 14.

 

(201).

 

 

 

 

 

Diaphragm (301) is ruptured.

Replace. See pages 15 to 17.

 

 

 

 

Restricted exhaust.

Remove restriction.

 

 

 

Air bubbles in fluid.

Suction line is loose.

Tighten.

 

 

 

 

Diaphragm (301) is ruptured.

Replace. See pages 15 to 17.

 

 

 

 

Loose inlet manifold (53), damaged seal

Tighten manifold bolts (54), or replace

 

between manifold and seat (101), or

seats (101) or o-rings (102). See

 

damaged o-rings (101).

page 14.

 

 

 

 

Loose diaphragm shaft bolt (14).

Tighten or replace. See pages 15 to 17.

 

 

 

 

Damaged o-ring (102).

Replace. See pages 15 to 17.

 

 

 

Fluid in exhaust air.

Diaphragm (301) is ruptured.

Replace. See pages 15 to 17.

 

 

 

 

Loose diaphragm shaft bolt (14).

Tighten or replace. See pages 15 to 17.

 

 

 

 

Damaged o-ring (102).

Replace. See pages 15 to 17.

 

 

 

Pump leaks air externally.

Air valve cover screws (3) are loose.

Tighten screws. See page 13.

 

 

 

 

Air valve gasket (20) or air cover gasket

Inspect; replace. See pages 12 to 13,

 

(10) is damaged.

18 to 19.

 

 

 

Pump leaks fluid externally from ball

Loose manifolds (50 or 53), damaged

Tighten manifold bolts (54), or replace

check valves.

o-ring (102) between manifold and seat.

o-rings (102). See page 14.

 

 

 

308639 11

Image 11
Contents Contents Instructions Parts List308639 Equipment Misuse HazardHazardous Fluids Hazardous Fluids InstallationGeneral Information Tightening Screws Before First Use GroundingKEY FLOOR-MOUNT Typical InstallationFluid Outlet Line MountingsAir Line Fluid LinesToxic Fluid Hazard Changing Manifold OrientationFluid Pressure Relief Valve Air Exhaust VentilationVenting Exhaust AIR Flush the Pump Before First Use Pressure Relief ProcedureStarting and Adjusting the Pump OperationFlushing and Storage MaintenancePreventive Maintenance Schedule LubricationProblem Cause Solution TroubleshootingTools Required ServiceRepairing the Air Valve Disassembly See Fig Relieve the pressureReassembly Ball Check Valve Repair Diaphragm Repair Removing and Replacing Bearings and Air Gasket on Disassembly Relieve the pressure302 301 Removing and Replacing Bearings and Air Gasket See Fig Through hole must be on bottom Detail of Bearings24D619, Aluminum 3275 Pump, Series a Pump MatrixHusky 3275 Pumps, Series C 232505, Aluminum 3275 Pump, Series CFor Husky 3275 Pumps, Series C Repair Kit Matrix303 301 302 61 2 114 201 102 101 201* 102 Parts DrawingDigit Description Qty Parts ListsAir Motor Parts List Matrix Column Fluid Section Parts List Matrix ColumnDiaphragm Parts List Matrix Column Technical DataSeat Parts List Matrix Column Ball Parts List Matrix ColumnTorque Sequence Side View Dimensional DrawingsFront View Pump Mounting Hole PatternFluid Pressure Curves Performance ChartsFluid Outlet PRESSURE--psi MPa, bar Air Consumption Curves AIR CONSUMPTION--scfm cubic meters/min308639 Graco Headquarters Minneapolis Graco WarrantiesGraco Information Toll Free, 612-623-6921, 612-378-3505 Fax