Kubota BX1870 Workshop Manual

FRONT AXLE
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
3-S12
[4] SERVICING
Clearance between Differential Case and Differential Side Gear
1. Measure the differential side gear boss O.D..
2. Measure the differential case bore I.D., and calculate the
clearance.
3. Measure the differential case cover bore I.D., and calculate the
clearance.
4. If the clearance exceeds the allowable limit, replace faulty parts.
9Y1210855FBS0020US0
Clearance between Differential Pinion Shaft and Differential
Pinion
1. Measure the differential pinion shaft O.D..
2. Measure the differential pinion I.D., and calculate the clearance.
3. If the clearance exceeds the allowable limit, replace faulty parts.
9Y1210855FBS0021US0
Backlash between Differential Pinion and Differential Side
Gear
1. Set a dial gauge (lever type) on a tooth of the differential pinion.
2. Fix the differential side gear, and move the differential pinion to
measure the backlash.
3. If the measurement exceeds the factory specifications, adjust
with the differential side gears shims.
(Reference)
• Thickness of adjusting shims:
– For side gear:
0.80 mm (0.031 in.)
1.0 mm (0.039 in.)
1.2 mm (0.047 in.)
– For pinion:
3.30 mm (0.130 in.)
3.50 mm (0.138 in.)
3.70 mm (0.146 in.)
3.90 mm (0.154 in.)
9Y1210855FBS0022US0
Clearance between
differential case and
differential side gear
Factory specification
0.040 to 0.082 mm
0.0016 to 0.0032 in.
Allowable limit
0.17 mm
0.0067 in.
Differential case bore
I.D.
Factory specification
26.000 to 26.021 mm
1.0237 to 1.0244 in.
Differential side gear
O.D.
Factory specification
25.939 to 25.960 mm
1.0213 to 1.0220 in.
Clearance between
differential pinion shaft
and differential pinion
Factory specification
0.025 to 0.055 mm
0.00099 to 0.0021 in.
Allowable limit
0.25 mm
0.0098 in.
Differential pinion shaft
O.D.
Factory specification
9.960 to 9.975 mm
0.3922 to 0.3927 in.
Differential pinion I.D. Factory specification
10.000 to 10.015 mm
0.39370 to 0.39429 in.
Backlash between
differential pinion and
differential side gear
Factory specification
0.1 to 0.3 mm
0.004 to 0.01 in.
KiSC issued 02, 2017 A

Kubota BX1870 Specifications

General

Engine Type	Diesel
Engine Power	18 hp
Transmission	Hydrostatic
Fuel Capacity	6.6 gallons
Wheelbase	55.1 inches
Type	Sub-Compact Utility Tractor
Engine	Kubota D722
PTO Power	13.5 hp
Number of Cylinders	3
Cooling	Liquid
Drive	4WD
Drive Type	4WD
Width	44.5 inches
Hydraulic System Type	Open center
PTO Speed	540 RPM
Displacement	0.719 L
Fuel Tank Capacity	6.6 gallons
Gears	Infinite (2-range) forward and reverse
Front Tire Size	18x8.5-10
Rear Tire Size	26x12-12