M/T Countershaft Inspection

  1. Inspect the gear surface and bearing surface for wear and damage, then measure the countershaft at points A, B, and C. If any part of the countershaft is less than the service limit, replace it with a new one.


    A Ball Bearing Surface (Transmission Housing   Side):
    30.020−30.033 mm (1.1819−1.1824 in.)
    B Distance Collar Surface:
    39.937-39.950 mm (1.5723-1.5728 in.)
    C Needle Bearing Surface (Clutch Housing Side):
    ARK5, AST5 Transmission:
    40.000−40.015 mm (1.5748−1.5754 in.)
    ARK7 Transmission:
    35.000−35.015 mm (1.3779−1.3785 in.)

    Service Limit:
    29.97 mm (1.180 in.)
    39.883 mm (1.5702 in.)
    ARK5, AST5 Transmission: 39.95 mm (1.573 in.)
    ARK7 Transmission: 34.95 mm (1.376 in.)

  1. Inspect the runout by supporting both ends of the countershaft. Rotate the countershaft two complete revolutions when measuring the runout. If the runout exceeds the service limit, replace the countershaft with a new one.
    0.02 mm (0.001 in.) max.
    Service Limit:
    0.05 mm (0.002 in.)