Ingersoll-Rand 251A1, Operation And Maintenance Manual

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18
MAINTENANCE SECTION
TROUBLESHOOTING GUIDE
Trouble Probable Cause Solution
Low power or low free speed Dirty Air Strainer Screen Using a clean, suitable, cleaning solution in a well–
ventilated area, clean the Air Strainer Screen.
Allow to air dry.
Worn or broken Vanes Replace complete set of Vanes.
Worn or broken Cylinder Examine Cylinder and replace it if it is worn or bro-
ken or if bore is scored or wavy.
Improper lubrication or dirt
build–up in the motor Lubricate the pump as instructed in
LUBRICATION. If lubrication does not result in
satisfactory operation, disassemble the pump,
inspect and clean all parts.
Erratic speed Sticking Governor Valve Replace Governor Valve and/or Governor Valve
Bushing.
Rough operation Worn or broken Rear Rotor Bear-
ing or Front Rotor Bearing Examine each Bearing. Replace if worn or
damaged.
Worn Rotor Key Replace the Key. Check the Rotor Shaft and Rotor
for keyslot wear and replace if necessary.
Scoring of End Plates and
Cylinder Improper assembly Make certain that all motor parts are properly
aligned prior to clamping the motor assembly.
Arbor Packing misalignment Remove the Backhead. Rotate the motor by hand to
align the Seal.
SAVE THESE INSTRUCTIONS. DO NOT DESTROY.