TM 5-4310-354-14
4-14. Drive Belt Service and Adjustment.
Service
and adjust the drive belt as shown in figure 4-5.
DRIVE BELT ADJUSTMENT
STEP 1.
LOOSEN ALTERNATOR PIVOT NUT.
LOOSEN ADJUSTING ARM CAP SCREW
ON ALTERNATOR AND ENGINE BLOCK.
STEP 2.
MOVE
ALTERNATOR
AWAY
FROM
ENGINE TO TIGHTEN BELT TENSION;
TOWARD ENGINE TO LOOSEN. PROPER
ADJUSTMENT IS
3/4-INCH BELT
DEFLECTION AT A POINT MIDWAY
BETWEEN CRANKSHAFT PULLEY AND
WATER PUMP PULLEY.
STEP 3.
WHEN
PROPER
ADJUSTMENT IS
OBTAINED, TIGHTEN ADJUSTING ARM
CAP SCREWS AT ENGINE BLOCK AND
ALTERNATOR
AND
TIGHTEN
ALTERNATOR PIVOT NUT.
BELT REPLACEMENT
STEP 1.
REMOVE THE FAN GUARD.
LOOSEN
ALTERNATOR
PIVOT
NUT
AND
ADJUSTING ARM CAP SCREWS ON
ALTERNATOR AND ENGINE BLOCK.
TS5-4310-354-14/4-5
STEP 2.
MOVE ALTERNATOR TOWARD ENGINE
TO LOOSEN DRIVE BELT.
REMOVE
BELT
FROM
ALTERNATOR
DRIVE
STEP 5.
ADJUST BELT TENSION BY MOVING
PULLEY, WATER PUMP PULLEY, AND
ALTERNATOR AWAY FROM ENGINE
CRANKSHAFT PULLEY.
UNTIL A BELT DEFLECTION OF 3/4-INCH
IS OBTAINED BETWEEN CRANKSHAFT
STEP 3.
REMOVE DRIVE BELT
BY
WEAVING
PULLEY AND WATER PUMP PULLEY.
OVER FAN BLADES.
THEN,
TIGHTEN
ALTERNATOR
ADJUSTING ARM CAP SCREWS AT
STEP 4.
INSTALL NEW DRIVE BELT BY WEAVING
ENGINE BLOCK AND ALTERNATOR.
OVER FAN BLADES AND RESTING BELT
TIGHTEN ALTERNATOR PIVOT NUT.
IN GROOVE OF CRANKSHAFT PULLEY,
INSTALL FAN GUARD.
WATER
PUMP
PULLEY,
AND
ALTERNATOR PULLEY.
Figure 4-5. Drive belt service and adjustment.
4-8
