5-27
MAINTENANCE
INSPECTING AND ADJUSTING THE
COMPRESSOR BELT (AC)
• Stop the engine and allow the machine
to cool down before performing
maintenance.
· The engine, muffler, radiator, hydraulic
lines, sliding parts and many other
parts of the machine are hot
immediately after the engine is
stopped. Touching these parts will
cause burns.
• The high-pressure pipes of the air
conditioner can be very hot (80 to 120°C
or 176 to 248°F). Be careful not to burn
yourself.
IMPORTANT: Do not let any oil or grease
get on the belt. It will cause the belt to
slip, decrease the cooling capacity or
shorten the service life of the air
conditioner.
If the belt is too slack, it will slip and vibrate,
resulting in decreased cooling capacity. The
service life of the air conditioner also will be
shortened. Adjust the belt tension to the
standard value.
Inspection
1. Open the engine hood.
2. Measure the belt (1) tension using the belt
tension gauge. The belt tension is normal
if the belt tension gauge indicates the
following values.
294 to 392 N or 66 to 88 lbf.
Adjustment
If the belt tension is not normal, adjust it with
the adjuster bolt (2).
1. Loosen the locking nut (3).
2. Turn the adjuster bolt (2) as follows.
· Tighten: Clockwise
· Loosen: Counterclockwise
3. Tighten the locking nut (3) after
adjustment.
Tightening torque:
· Locking nut (3) 31.4 to 45.1 N·m (23.2
to 33.3 ft-lb.)
Note: When replacing with a new belt, run
the engine at low idle speed for about 3 to 5
minutes to break in the new belt, before
adjusting the tension again.
Replacing
Replace the belt in the following cases:
· There are cuts or cracks.
· The belt is worn and touches the bottom of
the V groove in the pulley.
· The belt stretched too loose to be
adjusted.
AFTER THE INITIAL 50 HOURS (ONLY FOR NEW MACHINES)
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