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Trouble
Low power or low free speed
High free speed
Rough operation
Scoring
Air leaks
MAINTENANCE SECTION
TROUBLESHOOTING GUIDE
Probable Cause
Low air pressure at the Inlet of
the Grinder
Plugged Screens
Worn or broken Vanes
Worn of broken Cylinder
Improper lubrication or dirt
build–up in the motor
Worn Rotor Bearing Seal
Worn or broken Rear Rotor
Bearing or Front Rotor Bearing
Worn Rotor Key
Bent Arbor
Improper assembly
Worn Valve Seat or Valve Seat
Washer
Worn Throttle Valve Seals
Worn Arbor Housing Gasket
Oiler Plug worn or not tight
SAVE THESE INSTRUCTIONS. DO NOT DESTROY.
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).
Clean the Screen in a clean, suitable cleaning
solution in a well ventilated area. If it cannot be
cleaned, replace it.
Never operate a Grinder without an inlet
screen. Ingestion of dirt into the Grinder can,
in some cases, cause an unsafe condition.
Replace a complete set of Vanes.
Replace the Cylinder if it appears cracked or if the
bore is wavy or scored.
Lubricate the Grinder as instructed in LUBRICA-
TION. If lubrication does not result in satisfac-
tory operation, disassemble the motor, inspect and
clean all parts.
Replace the Rotor Bearing Seal Assembly if the
outside diameter of the hub is worn to 1.176"
(29.9 mm) or smaller and/or the large inside diam-
eter is worn to 0.91" (23.1 mm) or larger.
Examine each Bearing. Replace Rotor Bearing
Seal Assembly or Front Rotor Bearing if worn or
damaged.
Replace the Key. Check the Rotor Shaft or Rotor
for key slot wear and replace if necessary.
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.
Make certain that all motor parts are properly
aligned prior to clamping the motor assembly.
Replace worn parts.
Replace both Seals.
Replace the Gasket
Tighten the Plug. If the problem persists, replace
the Plug.
22
Solution
WARNING
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