FRONT AXLE
L3540-II, L4240-II, L5040-II, L5240-II, L5740-II , WSM
6-S18
Backlash between Spiral Bevel Pinion Shaft and Spiral Bevel
Gear
1. Set a dial gauge (lever type) with its finger on the spline of spiral
bevel pinion shaft.
2. Measure the backlash by moving the spiral bevel pinion shaft by
hand lightly.
3. Calculate the backlash from the ratio of the shaft diameter to the
gear diameter. (Backlash = Play x 2.0)
4. If the backlash is not within the factory specifications, change
the adjusting collar (3), (4).
For example, when the backlash is too large, change the collar
(3) to thinner one and change the collar (4) to thicker one. At this
time, if the collar (3) is thinned by 12 mm, the collar (4) must be
thickened by 1 mm.
(Reference)
• Standard size of adjusting collar (3), (4):
6.0 mm (0.236 in.) of thickness (total 12.0 mm)
• Standard size of adjusting shim (5):
2.0 mm (0.079 in.) of thickness
5. Adjust the backlash properly by repeating the above
procedures.
9Y1211167FAS0027US0
Backlash between Bevel Gear and Bevel Gear
1. Stick a strip of plastigauge to three spots on the bevel gear (1)
with grease.
2. Fix the front axle case, bevel gear case and front gear case.
3. Turn the axle.
4. Remove the bevel gear case from front axle case and measure
the thickness of the fuses with an outside micrometer.
5. If the backlash is not within the factory specifications, adjust with
shim (3).
(Reference)
• Thickness of adjusting shims:
0.4 mm (0.016 in.)
0.6 mm (0.024 in.)
0.8 mm (0.031 in.)
1.0 mm (0.039 in.)
1.2 mm (0.047 in.)
• Tooth contact:
More than 35 %
9Y1211167FAS0028US0
Backlash between spiral
bevel pinion shaft and
spiral bevel gear
Factory
specifi-
cation
L3540-II
0.10 to 0.30 mm
0.0040 to 0.011 in.
L4240-II,
L5040-II,
L5240-II,
L5740-II
0.20 to 0.30 mm
0.0079 to 0.011 in.
(1) Spiral Bevel Gear
(2) Spiral Bevel Pinion Shaft
(3) Adjusting Collar
(4) Adjusting Collar
(5) Adjusting Shim
Backlash between bevel
gear (2) and bevel gear
(1)
Factory
specifi-
cation
L3540-II
0.15 to 0.35 mm
0.0059 to 0.013 in.
L4240-II,
L5040-II,
L5240-II,
L5740-II
0.20 to 0.30 mm
0.0079 to 0.011 in.
(1) Bevel Gear
(2) Bevel Gear
(3) Shim
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