Thermo King 002008, Manual

Page: 76 / 155

Engine Maintenance
76
Model 50 Fan Belt Replacement
NOTE: Do not attempt to remove or install the
belts without loosening the adjustments. Belts
that are installed by prying over pulleys will fail
prematurely due to internal cord damage.
Removal
1. Loosen the idler pulley mounting bolts.
2. Move the idler pulley assembly to obtain
enough slack to remove the belt from the idler
and the electric motor.
3. Loosen the two condenser fan hub to the shaft
clamping bolts.
4. Tap the blower wheel with a soft hammer to
drive the blower wheel up the fan shaft to
provide 13 mm (1/2 in.) clearance between the
blower wheel and the inlet ring.
NOTE: If the condenser fan does not slide
on the fan shaft with light tapping, remove
the small access panel located on the
condenser coil header above the radiator
tank. Thread a 1/4-20 x 1 in. diameter bolt
into the end of the fan shaft. Tighten the bolt
and washer down on the condenser fan hub
to loosen the blower wheel. Drive the blower
wheel back to provide 1/2 in. (13 mm)
clearance between the blower wheel and
condenser fan inlet ring.
5. Lift the belt up over the condenser blower
wheel and remove it from the unit.
Installation
1. Slip the belt over the condenser blower wheel
and place it in the condenser fan pulley.
2. Drive the condenser blower wheel out toward
the condenser fan inlet ring using a soft
hammer.
3. Position the blower wheel so the edge of the
inlet ring lines up with the alignment mark on
the blower wheel (see Figure 50 on page 74).
4. Check the radial clearance between the blower
wheel and inlet ring with a gauge wire. Check
around the entire circumference to the inlet
ring and blower wheel (see “Condenser and
Evaporator Fan Location” on page 107).
5. Torque the blower hub clamping bolts to
24 N•m (18 ft-lb).
6. Seat the upper belt in the blower wheel pulley
groove.
7. Place the belt in the idler and electric motor
pulleys.
8. Move the idler pulley assembly to adjust the
belt tension to 74 on the belt tension gauge.
9. Tighten the idler pulley mounting bolt.
Clutch (Model 50)
Periodically inspect the clutch for worn bearings,
worn friction shoes and for broken springs. To
inspect the clutch:
1. Loosen the back-up hex nut and move the hex
nuts on the compression spring adjustment
screw to relieve the tension on the compressor
belts.
2. Support the compressor and unbolt the
compressor from the bell housing studs.
3. Remove the compressor from the bell housing
and turn the compressor to provide better
access to the clutch.
NOTE: The refrigeration lines may be
removed from the compressor to allow more
movement of the compressor for better access
to the clutch.
4. Remove the compressor belts.
5. Remove the clutch mounting bolt and special
washer.
6. Remove the clutch with a clutch puller.
7. Remove the key from the compressor
crankshaft and inspect the key and the
crankshaft for wear, burrs, or damage.