FUSO 4M4 – COOLING – ON-VEHICLE INSPECTION AND ADJUSTMENT – Inspection and Adjustment of Belt Tension

[Inspection]
• Press each belt at a central portion between pulleys with a force of approximately 98 N {10 kgf} as shown in the illustration and measure the amount of deflection of the belt.
A: Cooler compressor pulley (for air conditioner)
B: Tension pulley (for air conditioner)
C: Crankshaft pulley
D: Water pump pulley
E: Alternator pulley
P1, P2: Belt measuring part

• Place the small O-ring on at the scale mark corresponding to 98 N {10 kgf} (press force).
• Place the large O-ring on at the scale mark corresponding to the maximum permissible deflection value specified for the belt.

• Place at a central portion between pulleys of the belt and push the handle (indicated by the arrow in the illustration) until the O-ring touches the flange.

[Adjustment]
(1) Belt for fan
• Disconnect the negative battery cable from the battery.
• Disconnect the alternator B terminal harness from the alternator.
• Loosen the alternator mounting bolt, and adjust the tension of the belt by moving the alternator as required.
• After the adjustment is completed, retighten the mounting nuts firmly.

(2) Belt for air conditioner
• Loosen the tension pulley mounting nut and adjust the belt tension by turning the adjustment bolt.
• After the adjustment is completed, tighten the mounting bolt to the specified torque.

 

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