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 10 of 894
FRONT AXLE
TRUCK SERVICE MANUAL
When a vehicle is turned either to the right or
left, the inner wheel is required to turn in a smaller circle
than the outside wheel, Fig.
5.
Fig.
5
Inner Wheel Turns in a Smaller Circle Than
Outside Wheel
If the inner wheel is not permitted to turn in a
smaller circle or greater angle, tire scuffing will result.
Therefore, it is necessary for the front wheels to assume
a toed-out position during a turn.
Toe-out on turns is accomplished by having the
ends-of the steering arms (end at tie rod) closer together
than the king pins as shown in Fig.
6.
The amount of
toe-out depends on the length and angle of the steering
arms.
Fig. 6
Inside Wheel Turns at Greater Angle
Even though the toe-in with the wheels in the
straight-ahead position may be adjusted correctly, a bent
steering arm may cause the toe-out on a turn to be
incorrect, causing scuffing of tires.
The turning radius angle is checked using
turning radius plates SE-1447-2 or equivalent.
To check the turning radius angle, position the
front wheels on the plates and in the straight-ahead
position.
After removing the locking pins from each plate,
adjust the scale on the edge of the plates so that the
pointers read "zero." Turn the wheels to the right until the
gauge at the left wheel reads 20°.
Then read the angle
of the right wheel.
The right wheel should then be turned
to an angle of 200°.
The left wheel should be at the
same angle as was the right wheel when the wheels
were turned to the left.
STEERING KNUCKLE STOP SCREWS (I-Beam Axles)
Adjustable stop screws in the steering knuckle
control the turning angle or limit the movement of the
front wheels.
This prevents the tires from rubbing
against the nearest point on the chassis or the steering
gear from bottoming.
STEERING KNUCKLE STOP SCREWS (Driving Front
Axles)
There is a stop screw located on each end of the
axle housing for the purpose of limiting the amount of the
turning angle of the wheels.
These screws are not
adjusted in accordance with the frame and tire
interference as in conventional front axles.
Instead,
these screws are provided to limit the turning angle of
the universal joints in the axles.
8
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