Page 872 - Workshop Manual - Aumark (BJ1051)

31A-26
Transmission (646b/651b)-transmission assembly

6. Measure the meshing clearance of each pair gear
(a). Measure the meshing clearance of each pair.gear

Meshing clearance
Gear
Standard
Sixth gear 646B 0.12 ~ 0.3 mm
651B
Fourth gear 646B
651B 0.12 ~ 0.3 mm
Third gear 646B 0.116 ~ 0.292 mm
651B

Second gear 646B
651B 0.12 ~ 0.3 mm
First gear 646B
651B 0.132 ~ 0.324 mm

Hint:
Apply grease on the fuse that is 1mm in diameter and
15mm in length so as to make it adhere to the gear face,
rotate the gear for one revolution and measure and record
the fit clearance of the gear pair at the trisection places.
Replace with a new gear pair if it does not conform to the
provision.

7. Inspect the wear of gear and pairgear
(a). Check the meshing position of the gear with red marks for the gear pair at each gear shift, the middle part of the
tooth height is the appropriate position, the contact area shall not be less than 60% of the working face of gear,
otherwise, a new gear pair shall be replaced with.

(b). The wear length of the gear end surface shall not be over 15% of the gear length, otherwise, a new gear pair shall
be replaced with.
8. Remove the secondary-axle rear bearing cover
(a). Loosen the 8 bolts of the secondary-axle rear bearing
cover.

31A

Page 872