to twist adjusting nuts to change position of driven spiral bevel gear (when it is necessary, move active spiral
bevel gear assembly to adjust). If the clearance is larger than the regulated value, approach active spiral
bevel gear from driven spiral bevel gear; otherwise be away from it. In order to keep the adjusted preload of
taper rolling bearing of differential mechanism, twisting numbers of adjusting nuts at one side shall be equal
to twisting numbers of adjusting nuts at the other side.
When adjusting contact zone of spiral bevel gear pair, coat red color (red lead powder) on driven spiral bevel
gear teeth (coat three teeth usually), rotate driven spiral bevel gear with hands repeatedly, check contacting
moulage. Adjust the correct position of spiral bevel gear mesh moulage: it shall not be less than 50% along
with teeth height direction and teeth length direction, mesh moulage of driven bevel gear shall be close to the
center, and in the middle of teeth height, smaller than the small end on teeth length direction. Increasing
preload of differential bearing: after adjusting back lash of spiral bevel gear well, it shall guarantee the
clearance between taper rolling bearing at both sides of differential mechanism is 0. Following is the
adjusting methods.
Adjustment of contact zone and back lash when installing spiral bevel gear
Contact zone of driven spiral
bevel gear
Move driven gear to the direction of
active gear, if the clearance is too
small, move active gear outside
Move driven gear away from active
gear, if the clearance is too large,
move active gear inside
Move active gear to the direction of
driven gear, if the clearance is too
small, move driven gear inside and
outside
Move active gear away from driven
gear, if clearance is too large, move
driven gear inside
Method of adjusting mesh zone is usually increasing and decreasing adjusting gaskets and rotating
adjusting nuts. Adjusting of contact zone will affect performance and service life greatly, it shall be carried
out carefully.
Note: After adjusting, clean off red lead powder.
SPC000010 Rear Axle
Page 42
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