Heated Pump Troubleshooting; Air Motor Troubleshooting - Graco Therm-O-Flow 200 Instructions - Parts Manual

Heated Pump Troubleshooting

See pump manual for additional pump troubleshooting information.
Problem
Rapid downstroke or upstroke (pump
cavitation).
Material leaks around pump outlet.
Material leaks around bleed port.
Pump will not move up and down.
Leak around pump wet-cup.

Air Motor Troubleshooting

See air motor manual for additional air motor troubleshooting information. See Related Manuals, page 7.
Problem
Air motor will not run.
Air motor stalled.
Air continuously exhausting around
air motor shaft.
Air continuously exhausting around
air valve/slide valve.
Air continuously exhausting from
muffler when motor is idle.
Icing on muffler.
334130L
Cause
Material not heated to proper
temperature.
Air is trapped in pump.
Downstroke: Dirty or worn pump
intake valve.
Upstroke: Dirty or worn pump piston
valve.
Machine is out of material
Loose outlet fitting.
Loose bleed port fitting.
Problem with air motor.
Foreign object lodged in pump.
Platen not fully up to temperature.
Valve to air motor is off.
Worn throat seals.
Cause
Air motor solenoid is off.
Damaged main air valve spool or
poppets.
Damaged air motor shaft seal.
Air valve/slide valve gasket is dam-
aged.
Internal seal damage.
Air motor operating at high pressure
or high cycle rate.
Troubleshooting
Solution
Check and adjust temperature to
proper setpoint. Wait for pump/platen
to heat up.
Bleed air from pump. See Prime
Pump, page 31.
Clean or repair. See Pump Manual.
Clean or repair.
Adjust empty level sensor.
Tighten outlet fitting.
Tighten bleed port fitting.
See Air Motor Manual.
Relieve pressure. See Pump Manual.
Wait for full temperature.
Check gauges and valves to the air
motor.
Replace throat seals. See Servicing
the Throat packings in manual 334127
or 334128.
Solution
Wait for heat zones in use to reach
temperature setpoint values.
Inspect and clean poppets. See Air
Motor Manual.
Rebuild main air valve. See Air Motor
Manual.
Replace air motor shaft seal. See Air
Motor Manual.
Replace the valve gasket. See Air
Motor Manual.
Rebuild air motor. See Air Motor
Manual.
Reduce pressure, cycle rate, or duty
cycle of motor.
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