Kubota M108S

Last Updated: July 2024

Overview

The Kubota M108S is a 4WD row-crop tractor with a 16-speed selective gear fixed ratio transmission. It is powered by a 4-cylinder turbocharged intercooled No. 2 diesel engine from Kubota, model V3800-DT-TI, with a displacement of 230 cubic inches. The engine produces a maximum power output of 103.17 hp at 2499 rpm and a peak torque of 250 lb-ft at 1649 rpm, with torque rises of 21.6% and 16% at 1649 rpm and 2099 rpm respectively. Key specifications include a hydrostatic power steering system, a 9.6 quart coolant capacity, and agricultural tires. Dimensions are 160.1 inches long, 91.0 inches wide, and 106.0 inches tall with a cab. The operating weight is 8780 lbs with an operator. Additional notable features are an open-center hydraulic system with a maximum pressure of 2812 psi and pump delivery rates of 16.0 GPM at minimum pressure and 14.0 GPM at maximum hydraulic power, as well as sound levels ranging from 78.8 - 84.8 dB(A) depending on load and gear.

Key Specifications

Category: Row Crop

Power Output: 103.17

Transmission: 16-speed selective gear fixed ratio

Operating Weight: 8780

Fuel Type: No. 2 Diesel

Lift Capacity: 5765

Kubota M108S vs. Similar Tractors

Power Output

Below Average

Greater than 26% of similar tractors.

Hitch Capacity

Average

Greater than 40% of similar tractors.

Operating Weight

Above Average

Greater than 89% of similar tractors.

Technical Specifications

Engine

Manufacturer: Kubota
Model: V3800-DT-TI
Cooling Type: Liquid-cooled
Cylinder Orientation: Inline
Valve Configuration: -
Fuel Type: No. 2 Diesel
Induction Type: Turbocharged intercooled
Cylinders: 4
Displacement (ci): 230
Bore (in): 3.94
Stroke (in): 4.72
Rated RPM: 2600
Power Output (hp): 103.17

Transmission

Type: 16-speed selective gear fixed ratio
Forward Gears: 16
Reverse Gears: 16
Total Gears: -

Dimensions

Length (in): 160.1
Width (in): 91.0
Height (in): 106.0
Operating Weight (lb): 8780

Power Take-Off (PTO)

PTO Type: Independent
PTO Speed 1 (rpm): 540
PTO Speed 2 (rpm): -
PTO Speed 3 (rpm): -

Miscellaneous

Chassis: 4x4 MFWD 4WD
Drive Type: -
Steering Type: Hydrostatic power
Coolant Capacity (qts): 9.6
Front Tire Diameter (in): -
Front Tire Width (in): -
Rear Tire Diameter (in): -
Rear Tire Width (in): -
Front/Rear Rim Diameter (in): -
Tire Type: Ag
Manufacture - End Year: -
Hitch Type: Three-Point Hitch (Category II)
Hitch Category: Category 2
Hitch Position: -
Hitch Capacity (lb): 5765
Operator Station Type: ROPS or Cab with heat and A/C (optional)
Starter Type: Electric
Brake Type: Hydraulic wet disc
Hydraulic System Type: Open center

Test Results

Nebraska Tractor Test Laboratory - Test Date: November 18 - 21, 2008

Maximum Power and Fuel Consumption

Maximum Power: 103.17 HP (76.93 kW) at 2499 rpm
Fuel Consumption at Maximum Power: 6.22 Gal/hr (23.54 l/h) with a fuel efficiency of 0.421 lb/hp.hr (0.256 kg/kW.h)
Standard Power Take-off Speed (540 rpm): 99.27 HP (74.03 kW) at 2205 rpm with a fuel consumption of 5.79 Gal/hr (21.90 l/h) and fuel efficiency of 0.407 lb/hp.hr (0.247 kg/kW.h)

Drawbar Performance

Power at Rated Engine Speed: Not provided in the summary
Fuel Consumption at Rated Speed: Not provided in the summary

Torque and Engine Performance

Maximum Torque: 250 lb.-ft. (339 Nm) at 1649 rpm
Torque Rise: 21.6% at 1649 rpm, with an additional torque rise of 16% at 2099 rpm

Hydraulic Performance

Maximum Force Exerted: 5765 lbs (25.6 kN) with 2 assist cylinders
Pump Delivery Rate at Minimum Pressure: 16.0 GPM (60.6 l/min)
Hydraulic Power: 19.7 HP (14.7 kW) at 2412 psi (166 bar)

Overall Efficiency

Fuel Efficiency at Standard PTO Speed (540 rpm): 17.16 Hp.hr/gal (3.38 kW.h/l)
Fuel Consumption: Varies with power output, with maximum power consumption at 6.27 Gal/hr (23.75 l/h) at 2601 rpm

NTTL.(2008). Test 1944: Kubota M108S Diesel. Nebraska Tractor Test Laboratory. Retrieved from https://digitalcommons.unl.edu/tractormuseumlit/2316