Thermo King SB-210, Manual

Page: 98 / 159

Engine Maintenance
98
Model 50 Compressor Belt
Replacement
Removal
1. Loosen the back-up hex on the belt tensioner
compression spring adjustment screw.
2. Support the compressor and unbolt the
compressor form the flywheel housing (leave
the refrigeration lines connected).
3. Move the hex nuts on the compression spring
adjustment screw to relieve belt tension.
4. Swing the compressor assembly away from
the flywheel housing.
5. Remove the belts through the gap between the
clutch and the flywheel.
Installation
1. Install the belts on the clutch pulley through
the gap between the clutch and the flywheel.
2. Place the compressor in position and install
the mounting bolts.
3. Adjust the hex nuts on the compression spring
adjustment to tighten the belts to 79 on the
belt tension gauge.
4. Tighten the back-up hex nut on the belt
tension compression spring adjustment screw.
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 1/2 in. (13 mm) 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 expansion
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 87 “Condenser
Blower Alignment” on page 96.
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” in the Structural
Maintenance chapter).
5. Torque the blower hub clamping bolts to
(18 ft-lb) 24 N•m.
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.