Kubota M108S, Workshop Manual

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6-S17
M108S, WSM FRONT AXLE
[3] SERVICING
(1) 4WD Type
Backlash and Tooth Contact between Bevel Pinion Shaft and
Bevel Gear
1. Set a dial indicator (lever type) with its finger on the tooth surface.
2. Measure the backlash by fixing the bevel pinion shaft (5) and
moving the bevel gear (3) by hand.
3. If the backlash exceeds the allowable limit, adjust with the shim
(2).
4. Adjust the backlash properly by repeating the above procedure.
5. Apply red lead lightly over several teeth at three positions equally
spaced on the bevel gear (3).
6. Turn the bevel pinion shaft (5), while pressing a wooden piece
against the periphery of the bevel gear.
7. Check the tooth contact. If not proper, adjust according to the
instructions shown in the figure.
(Reference)
• Thickness of adjusting shim (2):
• The 1.0 mm (0.039 in.) shims are built both side in the standard.
• Thickness of adjusting shims (6):
• The 0.4 mm (0.012 in.) shim is built in the standard.
• Backlash changes per 0.1 mm (0.004 in.) shim : Approx. 0.05 mm
(0.002 in.).
IMPORTANT
■
• Adjust the tooth contact with shims (2) and (6) so that the
spiral bevel pinion shaft may not contact with the differential
case.
W1020806
Backlash between bevel
gear and bevel pinion
shaft
Factory spec.
0.20 to 0.30 mm
0.0079 to 0.011 in.
Allowable limit
0.40 mm
0.016 in.
0.1 mm (0.004 in.) 0.8 mm (0.031 in.)
0.2 mm (0.008 in.) 1.0 mm (0.039 in.)
0.4 mm (0.012 in.) 1.2 mm (0.047 in.)
0.1 mm (0.004 in.) 0.4 mm (0.012 in.)
0.2 mm (0.008 in.) 1.6 mm (0.063 in.)
(1) Differential Bearing Support 2
(2) Shim
(3) Bevel Gear
(4) Differential Bearing Support 1
(5) Bevel Pinion Shaft
(6) Shim
(7) Pinion Bearing Case (A) Proper Contact : More than 35 %
red lead contact area on the gear
tooth surface. The center of tooth
contact at 1/3 of the entire width
from the small end.
(B) Deep Contact :
Decrease the shims.
(C) Shallow Contact :
Increase the shims.
KiSC issued 06, 2007 A