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TM 10-3930-653-14&P
(A) Properly Adjusted Gear-tooth Contact
Fig. 2-185 shows the correct gear-tooth contact
bearing. The gear-tooth contact is initiated from the
small end and extended to approximately 75 % of
tooth length toward the large end. In the above
condition, the output shaft gear and spiral bevel gear
are properly installed and the correct backlash is
obtained.
Standard backlash: 0.15 to 0.25 mm
(0.00591 to 0.00984 in.)
Fig. 4-373. Properly Adjusted Gear-tooth Contact.
(B) The gear-tooth contact bearing and backlash should be adjusted in the following manners:
Corrective
A: To adjust gear-tooth contact.
Gear-tooth Contact
Cause
Action
B: To adjust backlash
Toe Bearing
Heel Bearing
High Bearing
Low Bearing
Spiral bevel gear is located too close
to output shaft gear. (Bearing is small.)
Spiral bevel gear is located too far
from output shaft gear. (Bearing is small)
Output shaft gear is located too far
from spiral bevel gear. (Large backlash)
Output shaft gear is located too close to spiral
bevel gear. (Small backlash)
(1)
Move spiral bevel gear away from output
shaft gear.
(2)
Add shims to output shaft gear to move it
toward spiral bevel gear to adjust backlash.
(1)
Move spiral bevel gear toward output shaft
gear.
(2)
Omit shims of output shaft gear. Move
output shaft
gear away from spiral bevel gear to adjust
backlash.
(1)
Add shims to output shaft gear and move
output shaft
gear toward spiral bevel gear.
(2)
Move spiral bevel gear away from spiral
bevel gear to adjust backlash.
(1)
Omit shims of output shaft gear and move
output shaft gear away from spiral bevel
gear.
(2)
Move spiral bevel gear toward output shaft
gear to adjust backlash
.
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