Removal
1. Disconnect hoses from fan motor. Cap lines to
prevent contamination.
2. Loosen set screw of flex coupling (3, Figure 4-
3)connecting motor shaft to blower wheel shaft.
3. Remove motor mounting capscrews (5) and wash-
ers.
4. Slide motor out of flex coupling.
Disassembly
1. Using solvent and brush to clean outside of motor
thoroughly.
2. Mark the motor plates nearest to drive shaft exten-
sion side. These marks can be used for matching
in reassembling motor.
3. Place motor in machinist vise. Use blocks of wood
or cardboard between motor and vise jaws.
4. Loosen and remove capscrews (13) and washers
(14).
5. Remove motor from vise. Using wood mallet or
plastic hammer, tap connector bosses to loosen
cover plate (15). Lift plate straight up off gear
journals.
6. Remove O-ring (16), pressure balance O-ring (11),
and back-up ring (12).
7. Remove pressure plate (17). Remove O-rings (10)
from journal bores of pressure plate.
8. Lift drive gear (1) and idler gear (6) straight up out
of gear plate.
9. Tap edges of gear plate (9) with mallet or plastic
hammer to loosen. If gear plate does not move by
this method, lift the plates up off work bench
slightly and tap the ears of flange plate lightly.
10. Dowels (4, Figure 4-5) are pressed into gear plate.
There are four dowels on each side and unless
gear plate is to be replaced, it is not necessary to
remove them.
91457
FIGURE 4-4. HYDRAULIC MOTOR
1. Gear and Shaft
2. Key
3. Shaft Seal
4. Snap Ring
5. Mounting Flange
6. Idler Gear
7. Bushing
8. O-ring
9. Gear Plate
10. O-ring
11. O-ring
12. Backup Ring
13. Capscrew
14. Washer
15. Cover Plate
16. O-ring
17. Pressure Plate
M04002 12/89 Alternator and Wheelmotor Cooling Air Filter System M4-5
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