Table 2-21. Countershaft Assembly Fits and Tolerances

TM 9-2520-246-34-1

FRAME 3

NOTE

Readings must be within limits given in table 2-21. The

letter L indicates a loose fit and the letter T indicates a

tight fit. If readings are not within given limits, throw

away part and get a new one.

Measure fit of two gears (1) on two countershaft gear surfaces (2).

Measure fit of two keys (3) in two countershaft keyways (4).

Measure fit of two bearings (5) on two countershaft bearing surfaces (6).

END OF TASK

Countershaft Assembly Fits and Tolerances

Table 2-21.

Size and Fit

of New Parts

Wear Limit

Index Number

Item/Point of Measurement

(inches)

Fit of gear on shaft

1 and 2

0.0005T to 0.0025T

0.0010L

0.0010L to 0.0020T

Fit of key in keyway

.0030L

3 and 4

Fit of bearing on shaft

0.0005T to 0.0015T

None

5 and 6

2-181