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4B-74
OVERHAUL MANUAL
SCREW (3)
SHIM
GUIDE CLIP (6)
DISC PACK S/A
THRUST WASHER (3)
CASE HALF-R.H
GUIDE CLIP (6)
PINION GEAR (3)
GOVERNOR ASS'Y
CASE HALF-L.H
SIDE GEAR
SHIM
EARED DISC (3)
PINION YOKE
SPLINED DISC (2)
THRUST BLOCK (2)
LATCHING BRK'T ASS'Y
Fig. 4 B - 2 H - 3 /4 Ton U n it
or greater, the differential will not lock as the added
traction is not necessary.
Service Test Procedure
1. Place the Truck on a fram e-contact hoist, allowing
free rotation of the rear wheels.
2. Raise hoist until wheels clear floor. Holding one wheel
stationary, slowly rotate other wheel approxim ately 1/2
revolution per second, in both the forward and reverse
directions. Wheel should rotate freely. If both wheels attem pt
to turn together, the differential is locking and is defective.
NOTE:
Rapid wheel rotation will cause a properly
operating differential to lock and both wheels will rotate
in the same direction.
3. Raise hoist to maxim um height with one person in
vehicle.
4. Start engine making sure that carburetor is set to
provide a low idle speed of 600-800 rpm.
5. Place transmission in drive range and apply brakes.
W ith m anual transmission, depress clutch and place
transmission in first gear.
6. Lock one rear wheel by pulling one parking brake
cable from under the vehicle.
7. W ith engine at low idle, slowly release brakes. W ith
manual transmission, slowly engage clutch.
8. Locked rear wheel will remain stationary and free
wheel will begin turning. It is im portant that brakes or clutch
be released slowly enough to start the free wheel turning and
allow the free wheel to gradually increase in speed. As speed
of the free wheel is increased, the differential will lock causing
the rotating wheel to stop or both wheels to turn at the same
speed. The engine may stall if equipped with a manual
transmission. It may be necessary to accelerate engine until
approximately 10 m ph is indicated on vehicle speedometer
to cause differential lock. If indicated speed can be increased
beyond 20 m ph w ithout causing differential lock, the unit is
not functioning properly.
NOTE:
R apid release of brakes or clutch, or rapid
acceleration of engine will invalidate test.
9. Lock opposite rear wheel and repeat procedure. The
following chart provides guidelines for diagnosis and repair
of differential complaints.
OVERHAUL PROCEDURES 8 -7 /8 RING GEAR
AXLE 1 /2 TON TRUCKS
CAUTION:
Due to critical internal clearance
dimensions, differential side gears and case cannot
be serviced separately. I f any side gear or case
damage is found, the entire differential must be
replaced.
Internal clearances are such that shims,
reaction block, and thrust rings should not be
replaced unnecessarily even i f slight wear
indications are present. I f shims, reaction block, or
thrust ring must be replaced due to damage, correct
measurement and replacement procedures must be
Содержание 1977 10 Series
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Страница 65: ...STEERING 3B 23 Fig 3B 65 M easure Back and Remark Housing Fig 3B 67 Tighten Lock Nut...
Страница 86: ...4B 14 OVERHAUL MANUAL Fig 4B 28 Gear Teeth C ontact Pattern Check...
Страница 125: ...REAR AXLE DIFFERENTIAL 4B 53 Fig 18E Gear Teeth Contact Pattern Check...
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Страница 164: ...4C 8 OVERHAUL MANUAL Fig 4C 12 Gear Tooth Pattern Contact Pattern...
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Страница 322: ...400 7A 2 OVERHAUL MANUAL Fig 7A 1C Side Cross Section Typical...
Страница 444: ...7B 64 OVERHAUL MANUAL Fig 7B 11S M od el 2 03 Transfer Case Exploded V iew...
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