Engine Maintenance
101
c. Use a 7/8 in. crow’s foot attached to a 3/8
in. torque wrench to turn the sprocket and
obtain a reading of 40 in-lb (4.5 N•m) on
the torque wrench for used belts and 45
in-lb (5.0 N•m) for new belts. Tighten the
pulley bolt while holding the sprocket in
this position. When using this procedure,
the pulley bolt must at first be loose
enough to allow the sprocket to rotate
freely. If not, the reading on the torque
wrench will not produce the proper belt
tension.
3. Place the compressor/evaporator
fan/alternator belt in the compressor pulley
and check to see that it is centered in the slot
on the left side of the idler bracket. If not,
adjust the position of the left evaporator fan
pulley on the fan shaft so the belt is centered
in the slot. Adjust the compressor/evaporator
fan/alternator belt to the proper tension after it
is centered in the slot.
4. Adjust the compressor/jackshaft (electric
motor) belt to the proper tension. The belt
tension should be set at a reading of 67 ± 3 on
the Thermo King Belt Tension Gauge. If the
Thermo King Belt Tension Gauge is not used,
the belt should deflect 1/2 in. (13 mm) at the
center of the longest span.
The engine/compressor belt tension should be set
at a reading of 70 ± 3 on the Thermo King Belt
Tension Gauge.
The compressor/jackshaft (electric motor) belt
tension should be set at a reading of 67 ± 3 on the
Thermo King Belt Tension Gauge.
If the Thermo King Belt Tension Gauge is not
used, the belt should deflect 1/2 in. (13 mm) at the
center of the longest span.
Belts should be tensioned cold and retensioned
cold after 10 hours of running. Reset
engine/compressor belt to 70 ± 3. Reset
compressor/jackshaft (electric motor) belt to
67 ± 3.
1. Engine
2. Compressor
3. Jackshaft or Electric Motor
Figure 53: Belt Layout
ARD044
To Next Page