Assembly-continued -706880982

TM 5-4210-233-14&P-1

5-43. FORWARD TANDEM AXLE AND DRIVE UNIT-Continued

(42)

Check tooth contact patterns of gear set.

(a) Movement of the contact patterns along

the length of the tooth is indicated toward

the "heel" or the 'toe" of the ring gear (19)

teeth. Always check the tooth contact

patterns on the drive side of the teeth.

(b) Apply a marking compound such (Item 56,

Appendix E) blue to approximately 12 gear

teeth of the ring gear (1 9). Rotate the ring

gear so that the marked teeth are next to

the drive pinion.

backward so that the marked gear teeth

engage the drive pinion (73) six times to

get the contact pattern. Repeat if needed

to get a clear pattern.

(d) The thickness of the shim pack (80) between the inner bearing cup (79) and the differential

carrier governs the tooth contact pattern.

NOTE

A high contact pattern indicates the drive pinion (73) is not

installed deep enough into carrier. A low pattern indicates the

drive pinion is installed too deep in the carrier.

(e) To gain access to the shim pack (80), refer to paragraph b. Disassemble and remove the drive

pinion (73), inner bearing up (79) and shim pack (80) from carrier.

(f) To correct a high contact pattern, increase the thickness of the shim pack (80).

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