Ingersoll-Rand 88H Series, Maintenance Information

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Troubleshooting Guide
Trouble Probable Cause Solution
Low power or low free speed Low air pressure at the Inlet Check the air pressure at the Inlet. For maximum performance and
durability of parts, the pressure must not exceed 90 psig
(6.2 bar/620 kPa).
Plugged Screens Clean the Screens in a clean, suitable cleaning solution in a well
ventilated area. If the screen cannot be cleaned, replace it.
WARNING
Never operate a Grinder without an inlet screen. Ingestion
of dirt into the Grinder can, in some cases, cause an unsafe
condition.
Worn or broken Vanes Replace a complete set of Vanes.
Worn or broken Cylinder Replace the Cylinder if it appears cracked or if the bore is wavy or
scored.
Improper lubrication or dirt
build-up in the motor
Lubricate the Grinder as instructed in LUBRICATION. If lubrication
does not result in satisfactory operation, disassemble the motor,
inspect and clean all parts.
High free speed Worn Rotor Bearing Seal Replace the Rotor Bearing Seal Assembly if the outside diameter
of the hub is worn to 1.1764” or smaller and/or the large inside
diameter is worn to 0.9103” or larger.
Rough operation Worn or broken Rear Rotor
Bearing or Front Rotor Bearing
Examine each Bearing. Replace Rotor Bearing Seal Assembly or
Front Rotor Bearing if worn or damaged.
Worn Rotor Key Replace the Key. Check the Rotor Shaft or Rotor for key slot wear
and replace if necessary.
Bent Arbor Mount the Arbor on centers. Check the bearing diameter for runout
with an indicator. Replace the Arbor if runout exceeds 0.002”
(0.051 mm) Total Indicator Reading.
Scoring Improper assembly Make certain that all motor parts are properly aligned prior to
clamping the motor assembly.
Air leaks Worn Valve Seat or Valve Seat Washer Replace worn parts.
Worn Throttle Valve Seals Replace both Seals.
Worn Arbor Housing Gasket Replace the Gasket.
Oiler Plug worn or not tight Tighten the Plug. If the problem persists, replace the Plug.
Related Documentation
For additional information refer to:
Product Safety Manual Information Manual 04584959.
Product Information Manual 16573214 and16576100.
Parts Information Manual 16573289.
Manuals can be downloaded from ingersollrandproducts.com.