4. DRIVE UNIT AND DRIVE AXLE
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4. DRIVE UNIT AND DRIVE AXLE
Truck model
FB10-7 FB15-7
FB20-7 FB25-7
FB30-7
FB18-7
FB25-7LB FB25-7V
FB30-7V
Item FB35-7S
Drive unit
Type Three-stage reduction
←
←
Model 81E-25 81N-25 81U-25
Reduction ratio 25.1
←
30.144
Drive axle
Type Full fl oating
←
←
Wheel dimensions 6.00 x 9 – 10PR Rib lug 21 x 8 – 9 16PR Rib lug 28 x 9 – 15 14PR Rib lug
FB18: 6.00x9-12PR Rib lug
FB35: 250-15-16PR J lug
Rim size 9 x 4.00E 9 x 6.00E 7.00T x 15
Air pressure 850 kPa {8.5 kgf/cm
2
} 1000 kPa {10 kgf/cm
2
} 800 kPa {8.0 kgf/cm
2
}
[120.9 psi] [142.2 psi] [100 psi]
FB18: 1000 kPa
{10 kgf/cm
2
} [142.2 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. The drive gear is supported by two ball bearings on the case. The rotation of the drive gear is
transmitted to the fi nal pinion gear.
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 fi tted by a reamer bolt. The ring is in mesh with the fi nal pinion gear.
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