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4. DRIVE UNIT AND DRIVE AXLE
Truck model
Item
FB10-8 FB15-8
FB18-8
FB20-8
FB25-8LB
FB25-8
FB25-8V
FB30-8
FB30-8V
FB35-8S
Drive unit
Type Three-stage reduction
← ←
Model 81E-25 81N-25 81U-25
Reduction ratio 25.1
←
30.144
Drive axle
Type Full oating
← ←
Wheel dimensions
6.00 x 9 – 10PR
Rib lug
21 x 8 – 9 16PR
Rib lug
28 x 9 – 15 14PR
Rib lug
Rim size 9 x 4.00E 9 x 6.00E 7.00T x 15
Air pressure
850 kPa {8.5 kgf/cm
2
}
[120.9 psi]
1000 kPa {10 kgf/cm
2
}
[142.2 psi]
800 kPa {8.0 kgf/cm
2
}
[100 psi]
4.1 GENERAL DESCRIPTION
4.1.1 DRIVE UNIT
The drive unit is a three-stage reduction type and located between the drive motor and the drive
axle as shown in Figs. 4.1 through 4.3.
The drive gear is splined to the output shaft of the drive motor, being in mesh with the counter
gear 1. The drive gear is supported by two ball bearings on the case. The rotation of the drive gear
is transmitted through the counter gears 1 and 2 to the ring gear.
The counter gear 2 of the 81N-25 and the 81U-25 is attached by two tapered roller bearings to
the case, with the starting torque adjusted with shims.
In the case the differential is installed by two ball bearings. The cross case has two side gears
and four pinions in it (Two pinions for the model 81E-25). For adjustment of the backlash between
each side gear and pinion, a washer is installed. These washers also work as bearings.
To the cross case a ring gear is tted by a reamer bolt. The ring is in mesh with the nal pinion
gear.
4. DRIVE UNIT AND DRIVE AXLE
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