TM-5-3805-254-14-P-2
TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)
TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)
JUNE 1980
TM-5-3805-254-14-P-2 - Page 56 of 894
MOTOR TRUCK SERVICE MANUAL
AXLES-REAR
TANDEM LOCK
The NoSPIN locking type differential can also be used in
place of the conventional interaxle differential and lock-
out control in tandem axles, Fig.
12.
In this capacity it
operates between the axles in the same manner as
between the wheels of a single axle.
When the "Tandem
Lock" (its name for this application) is used in the power
divider unit, the need for manual control of the interaxle
differential lockout is completely eliminated.
Operation
Inter-axle differential action is required when cornering to
permit forward tandem axle to travel farther and faster
than rear tandem axle.
The tandem lock inter-axle
differential, mounted on forward end of thru shaft, allows
either drive axle to turn faster than driven speed but does
not permit either axle to turn slower than driven speed
when power is applied.
A right or left turn in a forward
direction disengages front driven clutch (b) and side gear
(a) from the drive teeth of central driver or spider (c).
This results from the wheels on forward tandem axle
covering a greater arc than those on rear axle, and
driven by traction of road they rotate faster than driven
speed.
In like manner the rear driven clutch (d) tries to rotate
slower than central driver (c), but design prevents this.
Torque is then transmitted through rear side gear (e) of
tandem lock unit to rear tandem axle at driven speed to
propel the vehicle.
This automatic, fulltime power control
minimizes tire scuffing and axle shock loads.
It also
eliminates possible mechanical failure through driver
error in the incorrect use of a manual inter-axle lockout.
Maintenance
The disassembly, cleaning, inspection and repair of the
tandem lock is the same as covered previously for the
single axle unit.
For removal and installation of the inter-
axle differential, see specific instructions for the
conventional unit covered in the Service Manual,
Tandem Axle, Section R (CTS-2164).
IMPORTANT PRECAUTION
If a truck is equipped with a NoSPIN differential, power
will be transmitted to the opposite rear wheel or axle if
one of the rear wheels or axles slips.
Both rear wheels
or both rear axles must be raised free of ground if it is
necessary to operate one rear wheel with truck
stationary; otherwise, the wheel or axle that is not raised
will pull truck off its support.
LUBRICATION
The NoSPIN unit is lubricated with the same lube used in
conventional differentials.
Fill differential carrier through
filler hole until oil is level with hole.
For tandem axles be
sure to pour one (1) pint of lube into power divider
through hole on top of interaxle differential cover.
Check
level at each chassis lubrication.
Fill as necessary.
Drain differential carrier every 25, 000 miles or once a
year.
54
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