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TROUBLE SHOOTING
LISTED BELOW ARE SOME OF THE MOST COMMON CAUSES FOR THE GRINDER TO MALFUNCTION. MALFUNCTIONS BEYOND THE SCOPE OF THIS MANUAL
SHOULD BE BROUGHT TO THE ATTENTION OF YOUR ARO REPRESENTATIVE OR RETURN
THE
TOOL TO THE FACTORY FOR REPAIR.
CONDlTlON
LOW SPEED AND
POWER OR GRIND-
ER WILL NOT RUN.
THROTTLE VALVE
HARD TO OPERATE.
TOOL WILL NOT
SHUT OFF.
POSSIBLE CAUSE
1. INADEQUATE AIR SUPPLY.
2. AIR REGULATOR (38775) IMPROPER-
LY ADJUSTED.
3. AIR INLET OR EXHAUST SCREEN
PLUGGED.
4. OBSTRUCTION IN THROTTLE VALVE
OR VALVE NOT OPENING.
5. MOTOR NOT BEING PROPERLY LU-
BRICATED.
8. ROTOR BLADE IS MISSING, INCOR-
RECTLY INSTALLED, BADLY WORN
OR BEARING FAILURE.
1. DAMAGED VALVE PIN OR “0” RING.
CORRECTlVE ACTION
1. CHECK AIR SUPPLY FOR CORRECT REGULATOR ADJUST-
MENT (90 P.S.I.G. MAX. WHEN TOOL IS OPERATlNG).
2. CHECK REGULATOR ADJUSTMENT TO BE SURE OF MAXIMUM
AIR FLOW.
3. INSPECT, WASH CLEAN.
4. D&ASSEMBLE THROTTLE, CLEAN, INSPECT FOR OBSTRUC-
TIONS OR DAMAGED PARTS.
5. APPLY 2 OR 4 DROPS OF SPINDLE OIL IN AIR INLET. RUN TOOL
TO ALLOW OIL TO ENTER MOTOR - BE CERTAIN OILER IS
FULL OF OIL
8. DISASSEMBLE MOTOR, CLEAN AND INSPECT FOR PROPER
INSTALLATION, REPLACE BLADES AND/OR BEARINGS IF NEC-
ESSARY.
1. DISASSEMBLE VALVE COMPONENTS, INSPECT, REPLACE IF
NECESSARY.
1. DISASSEMBLE VALVE COMPONENTS, INSPECT. REPLACE 1. DAMAGED VALVE COMPONENTS.
I
I
PARTS IF NECESSARY.
DIMENSIONAL DATA
AIR
L
1-7/8”
(48 mm)
1/4” N.P.T.F. AIR INLET
1/4” N.P.T.F. AIR INLET
PN 49999-064