TM-9-2520-234-35

POWER TRAIN ASSEMBLY; ALLISON MODEL XTG411-2A

TECHNICAL MANUAL; FIELD AND DEPOT MAINTENANCE MANUAL

JULY 1962

TM-9-2520-234-35 - Page 234 of 323

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CHAPTER 6

REPAIR AND REBUILD STANDARDS

235. GENERA L

a . Wear Limits and Points of Measure-

ment. Data covering the sizes and fits of new

parts and wear limits information, is given in

pars. 236 through 249, below. Points of meas-

urement of all critical dimensions are indi-

cated by small letters in the exploded view

parts groups, figs. 373 through 386, fold-outs

2 through 15.

b . T-Tight, L-Loose. The "Size and Fit

of New Parts" column includes the manufacture

dimensions and tolerances, and the fits of mat-

ing parts. T denotes a tight (interference) fit;

L denotes a loose (clearance) fit.

c . Meaning of Wear Limits

(1) The wear limits indicate the dimen-

sions to which a part may wear before it must

be replaced. Normally, any part not worn be-

yond its wear limit will be approved for con-

tinued use, if it is not otherwise damaged.

(2) A single asterisk (*) in the wear

limits column indicates that the part should be

replaced when worn beyond the limits stated

in "Size and Fit of New Parts" column.

(3) A double asterisk (**) indicates a

limit applying to the fit between mating parts.

In such cases, wear is allowed on either or

both mating parts so long as the fit is within

the specified limit.

d . Standard Torque Listings. Standard

torque to which bolts, nuts and screws are to

be tightened is listed in par. 250 under Table

V. STANDARD TORQUE SPECIFICATIONS.

These are normal torque values

-

specia l

torques are listed in the copy pertinent to the

applicable parts.

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