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Kubota B5100 Maintenance

The Kubota B5100 is a two-wheel drive or four-wheel drive sub-compact utility tractor. This model was manufactured between 1978 and 1984. The tractor was designed in 2 versions: B5100E (2WD) and B5100DT (4WD).

The Kubota B5100 is equipped with a 31 cu.in (0.5L) Kubota Z500-1A 4-cycle 2-cylinder liquid-cooled naturally aspirated diesel engine. The engine has a cylinder bore of 2.63" (67 mm), piston stroke of 2.76" (70 mm), maximum power of 12 hp (8.9 kW), and 28.1 Nm (20.7 lb-ft) of max torque at 1800 rpm.

The mechanical transmission consists of a dry clutch and unsynchronized gearbox with six forward and two reverse gears. The maximum forward speed - 8 mph (12.8 km/h), maximum reverse speed - 4 mph (6.4 km/h). The Kubota B5100 was equipped with a ball screw type manual steering, differential mechanical shoe brakes, 4.00x9 (2WD) or 4.50x10 (4WD) front tires, and 7.00x16 rear tires. The wheelbase is 46.6 in (1180 mm).

Refill Capacities
Engine oil capacity, gal (L) 0.6 (2.3)
Engine coolant capacity, gal (L) 0.8 (3.0)
Hydraulic/transmission fluid capacity, gal (L) 2.25 (8.5)
Front axle oil capacity, qts (L) 0.65 (0.60)

Recommended Oil and Fluid
Engine oil type SAE 20, SAE 30, SAE 10W, 10W-30. API Service category CC, CD
Engine coolant type Kubota Antifreeze/Coolant
Hydraulic/transmission fluid type Kubota UDT or equivalent
Front axle oil type Gear lube SAE 80, SAE 80W-90

Service Intervals
Check battery and clean terminals Every 50 hours
Check front axle oil level Every 50 hours
Check hydraulic/transmission fluid level Every 50 hours
Lubricate axle hub bearings Every 50 hours
Change engine oil Every 75 hours
Clean engine air filter element Every 100 hours
Clean engine fuel filter Every 100 hours
Inspect and adjust fan belt Every 100 hours
Replace engine oil filter Every 150 hours
Replace hydraulic/transmission oil filter Every 300 hours
Change hydraulic/transmission fluid Every 300 hours
Change front axle oil Every 300 hours
Check and adjust engine idling Every 300 hours
Adjust parking and service brakes Every 300 hours
Clean radiator fins Every 500 hours
Replace engine air filter element Every 500 hours
Change engine fuel filter element Every 500 hours
Check and adjust valve clearance Every 500 hours
Flush cooling system and add new coolant Every 1000 hours

Replacement Parts
Engine oil filter part number HH150-32094
Engine fuel filter part number 1T021-43560 (Element)
Engine air filter part number 70000-11221
Hydraulic/transmission oil filter part number 66591-36224
Drive belt part number 70000-73818



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