88
TK 56433-5-MM-EN
wheel on the fan shaft to a torque of 13 ft-lb (18
N•m).
4. Center the inlet orifices in the blower orifices.
Tighten the inlet orifices securely.
5. Check the radial clearance by passing a 0.187 in.
(4.75 mm) gauge wire completely around the
circumference of the inlet rings and the blower
wheel.
Figure 113.
Evaporator Fan Location
1.
Check Clearance with
Wire
4.
Evaporator Blower
2.
Blower Housing Sides
5.
Radial Clearance
3.
Inlet Orifices
6.
Equalize Blower Inlet
Overlap
Fan Shaft Assembly
The unit is equipped with a fan shaft assembly that
contains special sealed bearings. The bearings should
be checked when the belt is replaced. Spin the fan shaft
with the belt removed and listen. Unusually loud
bearing noise indicates the fan shaft bearings should
be replaced.
Removal
1. Remove the fan drive belt. See “Fan Drive Belt” in
the Engine Maintenance Chapter.
2. Remove the mounting hardware for the upper
condenser inlet orifice and remove it.
3. Loosen the hub pinch bolts on the upper condenser
blower, slide the blower off the fan shaft and
remove it. Make sure to remove and keep the key.
4. Loosen the hub pinch bolts on the evaporator
blower so it can slide on the fan shaft.
5. Remove the fan shaft mounting bolts.
6. Remove the fan shaft while sliding the evaporator
blower off the end of the fan shaft. Make sure to
remove and keep the key.
N
No
otte
e:: Make sure to avoid hitting the machined
surface of the shaft against the structure
because that could cause damage, making it
difficult to remove/install the bearings and
create a starting point for further corrosion.
Disassembly
1. Remove the snap ring from the condenser end.
2. Press the fan shaft out from condenser end to the
evaporator end.
3. Remove the snap ring from the evaporator end.
4. Remove the bearings from the shaft by supporting
the bearing and tapping on the end of the shaft with
a soft hammer. Make sure to avoid damaging the
end of the shaft, which can make it difficult to
remove/install the bearings.
5. Remove the bearing from the housing with a
hammer and punch.
6. Clean and inspect the parts, but do not clean the
bearings in solvent. Replace the parts that show
significant wear or damage.
Figure 114.
Fan Shaft Assembly
1.
Snap Ring
6.
Fan Shaft
2.
Bearing (Condenser
End)
7.
Bearing (Evaporator
End)
3.
Wave Washer
8.
Wave Washer
4.
Housing
9.
Washer
5.
Key
Reassembly
IIm
mp
po
orrtta
an
ntt:: To prevent damage to the bearings, use
bearing drivers (or other suitable tools) on
the bearing races when installing the
bearings.
1. Install one of the bearings on the evaporator end of
the fan shaft.
