Graco Therm-O-Flow 20, Инструкция - Каталог запасных частей

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Troubleshooting
20 309858K
Heated Pump
See the pump manual for more information.
Air Motor
See the air motor manual for more information.
Problem Cause Solution
Rapid down or up stroke (pump
cavitation). Material not heated to proper tem-
perature. Check and adjust temperature set point.
Air trapped in pump. Purge air from the pump - page 13, step
6.
Downstroke: Lower check in pump
is worn.
Upstroke: Upper check in pump is
worn.
Repair pump. See pump manual.
Plate is not melting material fast
enough to supply pump. Slow pump speed to match melt capacity.
Material leaks around pump outlet. Outlet fitting is loose. Tighten outlet fitting.
Material leaks around bleed port. Bleed port fitting is loose. Tighten bleed port fitting
Pump does not operate. Air motor problem. See Air Motor troubleshooting, below.
Foreign object lodged in pump. Follow Pressure Relief Procedure, page
14. Remove pump from air motor, page
23. Remove object and reassemble
pump.
Wet-cup leaks. Worn throat seal. Tighten wet-cup and/or throat seal pack-
ings. If that does not stop leaking, replace
wet-cup and/or throat seal packings.
Problem Cause Solution
Air motor stalled Main air valve is dirty or damaged Clean/rebuild main air valve.
Air continually exhausting around
air motor shaft Air motor shaft seal is damaged Replace air motor shaft seal.
Air continually exhausting around
the air valve/slide valve Air valve/slide valve gasket is damaged Replace the valve gasket.
Air continually exhausting from
muffler while the motor is idle Internal seal damage Rebuild air motor.
Oil leaking from exhaust port Too much lubricant mixed in with the air
supply Reduce lubricant supply.
Frost build-up on muffler Air motor operating at too high a pres-
sure or cycle rate Reduce air motor pressure, cycle
rate, or duty cycle.