Thermo King SB-190 30, Manual

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Engine Maintenance (Rev. 12/03)
55
Installation
1. Slip the belt into the groove of the idler pulley.
2. Push the idler adjusting arm back in toward the unit.
3. Slip the belt onto the pulley groove on the engine.
4. Pull the idler adjusting arm back OUT and adjust the
belts to the proper tension.
5. Tighten the idler assembly pivot bolts and the idler
adjusting arm bolts.
Upper Fan Belt
Removal
1. Loosen the idler adjusting arm bolts and remove the
lower fan belt
2. Push the idler adjusting arm in and the idler assembly
up. The upper belt should become slack and slip down
out of the idler pulley groove.
3. Pull the idler adjusting arm OUT. The upper fan belt
should slip off the idler pulley as the idler pulley hub
clears the curbside idler mounting bracket.
4. Loosen the two condenser fan hubs to the shaft clamp-
ing bolts and the end of shaft bolt.
5. 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 13 mm (1/2 in.) clearance
between the blower wheel and condenser fan inlet ring.
6. 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 con-
denser 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.
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.
1. Blower Wheel
2. Inlet Ring
3. Alignment Mark
4. Edge of Inlet Ring
Condenser Blower Alignment
aea749
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