Thermo King SB-190 30, Manual

Page: 96 / 119

Structural Maintenance (Rev. 12/03)
86
Evaporator Fan Blower
1. Loosen the inlet rings on the sides of the blower hous-
ing.
2. Center the blower wheel in the blower housing with
equal overlap on both inlet rings. The overlap on each
ring should be approximately 0.15 in. (3.8 mm).
3. Tighten the hub bolts that hold the blower wheel on the
fanshaft.
4. Center the inlet rings in the blower orifices. Tighten the
inlet rings securely.
5. Check the radial clearance by passing a wire com-
pletely around the circumference of the inlet rings and
the blower wheel.
6. Torque the blower hub bolts to 18 ft-lb (24 N•m).
FAN SHAFT ASSEMBLY
The unit is equipped with a one-piece fan shaft assembly
that contains tapered roller bearings in a sealed oil reservoir.
This assembly does not require any maintenance. There is a
level plug and a fill plug, but they are not normally used
except after removal and repair of the fan shaft assembly.
The condenser and evaporator end oil seals should be
checked during the pre-trip inspection for oil leakage. If
there is any sign of leakage, the fan shaft assembly should
be removed and repaired.
NOTE: The fan shaft assembly requires a special lubri-
cant, Thermo King P/N 203-278.
Fan Shaft Assembly Overhaul
Disassembly
1. Remove the fan shaft assembly from the unit. Remove
both oil plugs and drain the oil from the housing.
2. After draining the oil from the housing, remove the
four retaining bolts from the condenser end of the
assembly.
3. To remove the shaft from the assembly, tap the opposite
end of the shaft with a soft hammer. After the shaft has
been removed, clean all parts in clean solvent.
4. Using a punch, remove the oil seal from the evaporator
end of the assembly. With the seal removed, clean the
housing in clean solvent.
5. Check the condition of the vent. If it is loose or dam-
aged, it must be repaired or replaced.
6. After all the parts are cleaned, inspect the bearings and
bearing races for wear or damage.
7. If necessary, remove the bearings by tapping them off
the shaft with a hammer and a punch. Be careful not to
damage the shaft with the punch.
1. Check Clearance with a Wire
2. Blower Housing Sides
3. Inlet Rings
4. Evaporator Blower
5. Radial Clearance
6. Equalize Blower Inlet Overlap
Evaporator Fan Location
AEA720