TM 5-3810-300-24&P-3
BLOWER DRIVE GEAR 1.7.6
washer (Fig. 2). The other bearing is installed with the
end flush to .030" below the surface of the face of the
support. Each of the former bearings were flanged.
Replacement bearings must withstand a 2000 lb. end
load without moving, also the bearing bores must be
square with the inner and outer faces of the support
within .001" total indicator reading.
Replace the blower drive shaft if the serrations are worn
or damaged.
Inspect the blower drive coupling support, cam, spring
seats and spring packs. Replace worn or damaged
parts.
The current blower drive couplings effective with Engine
Serial Numbers 3A-38417, 4A-77750 and 6A-84358,
incorporate spring seats which prevent pressure and
wear from the spring packs on the coupling, thereby
prolonging the life of the coupling. Shorter springs are
required for use with the spring seats. When a spring
replacement is necessary, the new springs and spring
seats, available in a kit, must be installed.
Examine the blower drive gear.
If the teeth are
excessively worn, scored or pitted, the gear must be
replaced.
Assemble Blower Drive Gear and Support Assembly
The relative location of the parts is shown in Fig. 5.
1. Secure the blower drive gear support (61) in a vise
with soft jaws.
2. Press the drive gear hub (54) into the drive gear
Fig. 4 - Blower Drive Shaft Mounting
(53).
6. Install a new lock washer (58) and finger tighten the
3. Lubricate the drive gear hub, bearings in the support,
nut (57) on the hub. Install two bolts into the
thrust surfaces and blower drive thrust washer with
threaded holes in the drive gear hub. Place a
engine oil.
suitable holding bar across the bolts to keep the hub
from rotating and tighten the hub nut to 50-60 lb-ft
4. Place the thrust washer (102) on the protruding
torque. Bend the ears of the lock washer against the
bearing in the flywheel housing side of the sup-port
nut to lock the nut in place. Remove the two bolts.
and insert the blower drive gear hub and gear
assembly.
7. Assemble the blower drive coupling.
5. Locate the lock ball (55) in its place on the drive gear
a. Place the drive coupling support (67) on wood
hub and slide the hub thrust washer (56) into position
over the lock ball. The thrust washer must be
installed with the tapered face toward the threads on
b. Install the spring end seats (101) and place the
the hub.
spring seats (70) in each corner of the drive
coupling support.
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