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 601 of 894

PROPELLER SHAFT

TRUCK SERVICE MANUAL

General

To compensate for the alternate increase and

decrease in shaft length caused by rear axle suspension

deflection, a slip joint is incorporated within the drive line.

The slip joint is splined to accept the shaft, and it is

here that propeller shaft phasing can be altered through

rotation of the slip joint.

A correctly phased propeller shaft is one in which the

yoke bores or flange ears are in the same plane, Fig. 5.

Propeller shaft phasing affects joint cancellation in

that an incorrectly phased shaft will induce torsional

excitation (shaft windup and unwind).

It can be see in Fig. 4 that a propeller shaft is out of

phase any time that the slip joint yoke bore or flange ear

center line is rotated to any point between 0 and 180

degrees with respect to the yoke or flange at the

opposite end of the shaft.

Positioning the yoke at one

end of the shaft at 0 degrees and the slip joint yoke at 90

degrees results in a maximum out-of-phase condition

and torsional excitation will be greatest.

Drive line

vibration will be severe.

To provide correct propeller shaft phasing, the slip

joint and shaft are marked with arrows or dots, Fig. 6.

If

these markings are not visible, mark shaft and slip joint

before disassembling joint.

During reassembly align slip

joint arrow with shaft arrow.