Kubota Z750

Kubota Z750The Kubota Z750 is a 743 cc (45.3 cu·in) natural aspirated two-cylinders four-stroke liquid-cooled internal combustion vertical diesel engine, manufactured by Kubota Corporation for general-purpose applications.

The cylinder bore and piston stroke are 76.0 mm (2.99 in) and 82.0 mm (3.23 in), respectively. Compression ratio rating is 21.0:1.

This engine produced 17.3 PS (12.7 kW; 17.0 HP) at 2,800 rpm of horsepower.

The Kubota Z750 features:

  • Fuel injection pump
  • Centrifugal ball mechanical governor
  • Forced lubrication by pump
  • Liquid cooling system
  • Electric starter
  • Charging alternator

General information

Engine Specifications
Engine model Z750A
Engine type 4-stroke, vertical, two-cylinders
Displacement 743 cm3, (45.3 cu·in)
Max. horsepower 17.3 PS (12.7 kW; 17.0 HP) at 2,800 rpm
Max. torque
Cooling system Liquid-cooled
Lubricating system Forced lubrication by pump
Combustion chamber
Fuel system Fuel injection pump
Fuel used Diesel fuel No.2-D
Starting system Electric starter
Governor Centrifugal ball mechanical governor
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 393 x 435 x 540 mm (15.5 x 17.1 x 21.3 in)
Dry weight 71.0 kg (156.5 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio: 21.0:1
Cylinder bore: 76.0 mm (2.99 in)
Piston stroke: 82.0 mm (3.23 in)
Cylinder internal diameter (standard): 79.000-79.030 mm (3.1102-3.1114 in)
Number of piston rings (compression / oil): 2/1
Piston pin diameter: 23.100 mm (0.9094 in)
Side clearance (Second): 0.065-0.090 mm (0.0026-0.0035 in)
Side clearance (Oil): 0.020-0.060 mm (0.0008-0.0024 in)
Ring end gap (Top): 0.300-0.450 mm (0.0118-0.0177 in)
Ring end gap (Second): 0.300-0.450 mm (0.0118-0.0177 in)
Ring end gap (Oil): 0.250-0.400 mm (0.0098-0.0157 in)
Number of main bearings: 3
Crankshaft main journal diameter: 51.990-52.010 mm (2.0468-2.0476 in)
Crankpin journal diameter: 43.880-43.900 mm (1.7276-1.7283 in)
Cylinder head
Valves: 2, (4 valves in total)
Valve seat width (INTAKE): 1.500 mm (0.060 in)
Valve seat width (EXHAUST): 1.500 mm (0.060 in)
Value seat angle (INTAKE): 45°
Value seat angle (EXHAUST): 45°
Valveface angle (INTAKE): 45°
Valveface angle (EXHAUST): 45°
Valve steam diameter (INTAKE): 7.950-7.975 mm (0.313-0.314 in)
Valve steam diameter (EXHAUST): 7.950-7.975 mm (0.313-0.314 in)
Valve spring free length (INTAKE): 42.0 mm (1.6535 in)
Valve spring free length (EXHAUST): 42.0 mm (1.6535 in)
Cam height (INTAKE): 36.870 mm (1.4516 in)
Cam height (EXHAUST): 36.870 mm (1.4516 in)
Camshaft journal diameter : 39.935-39.950 mm (1.5722-1.5728 in)

Tightening torque

Tightening torque specs
Cylinder head screw: 75.0-82.0 Nm (7.65-8.40 kgf·m, 55.3-60.5 lb·ft)
Connecting rod screw: 37.0-41.0 Nm (3.8-4.2 kgf·m; 27.3-30.3 lb·ft)
Flywheel screw: 54.0-58.0 Nm (5.5-5.9 kgf·m; 39.9-42.8 lb·ft)
Idle gear shaft screws: 32.4-37.3 Nm (3.3-3.8 kgf·m; 23.9-27.5 lb·ft)
Bearing case cover mounting screw: 49.0-68.4 Nm (5.0-7.0 kgf·m; 36.2-50.5 lb·ft)

Service Data

Maximum speed: 2,950 rpm
Idle speed: 600-650 rpm
Valve clearance
Intake valve clearance: 0.18-0.22 mm (0.0071-0.0087 in)
Exhaust valve clearance: 0.18-0.22 mm (0.0071-0.0087 in)
Oil system
Lubrication system: Forced lubrication
Oil type: DS or DM
Recommended oil: SAE 80
Oil capacity: 3.5 L (3.7 US. qt, 3.08 Imp. qt.)
Fuel system
Injection timing: 25° B.T.D.C.
Fuel injection pressure 13.73-14.71 MPa (140-150 kgf/cm2, 1991-2133 psi)
Cooling system
Type: Pressurized radiator, forced circulation with water pump
Coolant capacity: 5.3 liters (5.6 US.qts, 4.7 Imp. qts)
Electrical system
Battery: 12V, 65AH or equivalent
ATTENTION! Dear visitors, this is an informational database of technical specifications, we are not a parts supplier or a marketplace.

We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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