Ice In Air Motor - Graco XL 10000 Instructions And Parts

Problem
Air motor pauses at top change over. Top pilot valve exhaust restricted by
Air motor pauses at bottom change
over.
Motor runs slower and pump looses
• uid pressure on one stroke only.
Motor runs slower and pump looses
• uid pressure on both strokes
equally.

Ice In Air Motor

When compressed air is exhausted, the sudden drop in
pressure causes the air temperature to drop below the
freezing point. This causes any water liquid or vapor to
turn to ice.
Higher air pressures pack high amounts of air and water
vapor in each cycle and create more expansion and ice.
Higher cycle rates also build up the ice and lower the
motor temperature faster. It is important to select the
correct motor and pump size to run at a lower pressure,
and cycle slower.
Warm humid climates can produce high levels of icing
because of the higher humidity levels. Low ambient tem-
peratures near freezing make it easier for the motor
parts to drop below freezing.
334644C
Cause
dirt or ice.
Bottom pilot valve exhaust restricted
by dirt or ice.
Ice has collected in air manifold pas-
sages, or valve.
Ice has collected where exhaust
expands from the shuttle valve plate
manifold (5) into the muf• er (12)
To minimize ice build-up:
• Lower the dew point of the compressed air. Use a
refrigerated air dyer, coalescing • lter, or desiccant
• lter to lower the water vapor content of the air.
• Raise the compressed air temperature. Warmer
air going in helps the motor parts stay above freez-
ing. Compressed air, especially at these volumes, is
warm when compressed. Keep the air warm or stay
near the compressor to reduce icing.
• Use the bleed air to clear ice build up.
Troubleshooting
Solution
Swap pilot valve or clear exhaust
port.
Swap pilot valve or clear exhaust
port.
Thaw or remove ice. Lower moisture
content of compressed air. Reduce
load on motor. See below.
Open the bleed air valve (119) on the
main shuttle valve. This will bleed
some warm air through anytime air is
supplied to the motor.
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