TM-9-2520-215-34

CROSS-DRIVE TRANSMISSION ASSEMBLY

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

DECEMBER 2005
TM-9-2520-215-34

  TM-9-2520-215-34 - Page 113 of 508

TM 9--2520--215--34
ADJUSTING STEER BEVEL DRIVE GEAR BACKLASH AND GEAR TOOTH
CONTACT PATTERN
0025 00
THIS WORK PACKAGE COVERS:
Adjusting Steer Bevel Drive Gear Backlash and Gear Tooth Contact Pattern
ADJUSTING STEER BEVEL DRIVE GEAR BACKLASH AND GEAR TOOTH CONTACT PATTERN
1. Adjust backlash of steer bevel gear set by adjusting spanner nuts at both sides of driven gear on drive shaft.
Backlash should be adjusted to that etched on the steer bevel drive gear (recorded in WP 0024 00).
2. Lightly coat three or four teeth of driven gear with a mixture of red lead and oil.
3. Using a flat stick, pry drive gear up by pivoting stick on drive shaft. Apply enough leverage to snub rotation of
drive gear. Run painted teeth of driven gear into mesh with drive gear. Reverse rotation to mark both sides of
teeth. Check gear tooth contact pattern produced with desired pattern below.
GEAR TOOTH MESH PATTERN DESIRED FOR STEER
BEVEL DRIVE GEAR WHEN MATED WITH DRIVEN GEAR
(BOTH SIDES OF TOOTH).
GEAR TOOTH MESH PATTERNS DESIRED FOR OUTPUT
BEVEL DRIVE GEAR WHEN MATED WITH DRIVEN GEAR.
CONVEX SIDE OF TOOTH
CONCAVE SIDE OF TOOTH
HEEL
HEEL
TOE
TOE
TOE
HEEL
0.05
APPROX
0.25 APPROX
0.06 APPROX
4. If necessary, adjust shim pack to obtain proper gear tooth contact pattern.
NOTE
Backlash must be readjusted as next step when shim pack is changed. Refer to Step 1.
5. For steer bevel gears etched with a backlash adjustment in 0.018 to 0.022 inch range, this is final setting. For
those in 0.006 to 0.012 inch range, readjust backlash (after gear tooth contact pattern is satisfactory) to 0.018
inch.
6. Install remaining three lockrings on spanner nuts on drive shaft. Be certain that inner ends of rings are seated in
slots in shaft. Lockring tails (viewed from right side of transmission) wrap counterclockwise around spanner nuts.
Stake edges of ring grooves at several points to retain rings.
END OF WORK PACKAGE
0025 00--1/2 blank


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