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MAINTENANCE
AFTER THE INITIAL 50 HOURS (ONLY FOR NEW MACHINES)
3. Tighten the bolt (5) and locking nut (4).
Tightening torque:
· Locking nut (6) 25 N·m (18.1 ft-lb)
· Bolt (7) 51N·m (37.6 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.
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.
• Before performing maintenance on top
of the work bench, clean the footing and
observe the following precautions to
prevent falling.
· Do not spill oil or grease.
· Do not leave tools scattered around.
· Watch your step when walking.
• Never jump down from the machine or
the work bench. When getting on or off
the machine or work bench, use the
steps, handrails or work bench to
support your body. Your weight should
be evenly distributed among the three
contact points (one hand and two feet
or two hands and one foot).
• Do not stand on the dozer blade and
perform maintenance work. Doing so is
dangerous because of the unsteady
foothold. Use the work bench.
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.
432.2 to 449.8 N or 97.2 to 101.1 lbf.
Adjustment
If the belt tension is not normal, tilt the
compressor to adjust the tension.
1. Loosen the fixing bolt (5) and fixing nut (6).
2. Turn the adjuster bolt (7) as follows.
· Tighten: Clockwise
· Loosen: Counterclockwise
3. Tighten the fixing bolt (5) and fixing nut (6)
upon completion of adjustment.
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.
5-29
AM0G0052
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