Specifications, Service and Repair of Farm and Lawn Tractors

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Kubota D722 Engine

General Technical Data

Kubota D722 Engine Specifications

Engine Model .......... Kubota D722
Engine Type .......... Vertical, water-cooled, 4-stroke diesel
Number of cylinders .......... 3
Bore, mm (in.) .......... 67.0 (2.64)
Stroke, mm (in.) .......... 68.0 (2.68)
Total displacement, cm3 (cu. in.) .......... 719 (43.9)
Gross power, kw (hp) .......... 14.9 (20.0)
Net power, kw (hp) .......... 14.0 (18.8)
Maximum speed, rpm .......... 3800
Idling speed, rpm .......... 900-1000
Combustion Chamber .......... Spherical type (E-TVCS)
Direction of rotation .......... Counter-clockwise
Compression ratio .......... 23.5:1
Firing order .......... 1-2-3

Fuel System

Fuel injection pump .......... Bosch MD type mini pump
Injection nozzle .......... Bosch "Throttle" type
Injection timing, deg (rad) .......... 21 (0.37) before T.D.C.
Injection pressure, MPa (psi) .......... 13.73 (1991)
Governor .......... All speed mechanical governor

Lubricating System

Lubricating system .......... Forced lubrication by trochoid pump
Oil pressure indicating .......... Electrical type switch
Oil filter .......... Full flow paper filter (cartridge type)

Electrical System

Starting system .......... Electric starting with starter
Starting Motor .......... 12V, 0.8 kW
Starting support device .......... By glow plug in combustion chamber
Battery .......... 12V, 36 AH
Charging Alternator .......... 12V, 150W

Dimensions

Length, mm (in.) .......... 426 (16.8)
Width, mm (in.) .......... 389 (15.3)
Height, mm (in.) .......... 520 (20.5)
Dry weight, kg (lbs.) .......... 63.0 (139)

Kubota D722 Maintenance Data

Fuel type .......... Diesel fuel No. 2-D
Engine oil type .......... SAE 10W-30/15W-40
Engine oil capacity, L (qts) .......... 3.2 (3.4)
Coolant capacity, L (qts) .......... 3.1 (3.3)
Oil filter change interval .......... Every 200 hours
Oil change interval .......... Every 200 hours
Fuel filter change interval .......... Every 400 hours

Kubota D722 Service Specifications

Cylinder Block

Cylinder Liner I.D. .......... 67.000-67.019 mm (2.6378-2.6385 in.)
Cylinder Liner (Oversize 0.25 mm) I.D. .......... 67.250-67.269 mm (2.6477-2.6483 in.)
Camshaft Alignment .......... 0.01 mm (0.0004 in.)
Cam Height (Intake and Exhaust) .......... 26.88 mm (1.058 in.)
Idle Gear Shaft to Idle Gear Bushing, Oil Clearance .......... 0.020-0.084 mm (0.00079-0.0033 in.)
Idle Gear Shaft O.D. .......... 19.967-19.980 mm (0.78611-0.78661 in.)
Idle Gear Bushing I.D. .......... 20.000-20.051 mm (0.78740-0.78940 in.)
Piston Pin Bore I.D. .......... 20.000-20.013 mm (0.78741-0.78791 in.)
Piston Pin to Small End Bushing, Oil Clearance .......... 0.014-0.038 mm (0.00056-0.0014 in.)
Piston Pin O.D. .......... 20.002-20.011 mm (0.78748-0.78783 in.)

Cylinder Head

Valve Clearance (Cold) .......... 0.145-0.185 mm (0.00571-0.00728 in.)
Compression Pressure .......... 2.85-3.23 MPa (413-469 psi)
Top Clearance .......... 0.50-0.70 mm (0.020-0.027 in.)
Cylinder Head Surface, Flatness .......... 0.05 mm (0.002 in.)
Valve Recessing (Intake and Exhaust) .......... 0.10-0.10 mm (0.0039-0.0039 in.)
Valve Stem to Valve Guide (Intake and Exhaust), Clearance .......... 0.030-0.057 mm (0.0012-0.0022 in.)
Valve Stem O.D. .......... 5.968-5.980 mm (0.2350-0.2354 in.)
Valve Guide I.D. .......... 6.010-6.025 mm (0.2367-0.2372 in.)
Rocker Arm Shaft to Rocker Arm, Oil Clearance .......... 0.016-0.045 mm (0.00063-0.0017 in.)
Rocker Arm Shaft O.D. .......... 10.473-10.484 mm (0.41233-0.41275 in.)
Rocker Arm I.D. .......... 10.500-10.518 mm (0.41339-0.41409 in.)
Push Rod Alignment .......... 0.25 mm (0.0098 in.)

Timing Gear

Crank Gear to Idle Gear, Backlash .......... 0.0430-0.124 mm (0.00170-0.00488 in.)
Idle Gear to Cam Gear, Backlash .......... 0.0470-0.123 mm (0.00185-0.00484 in.)
Idle Gear to Injection Pump Gear, Backlash .......... 0.0460-0.124 mm (0.00182-0.00488 in.)
Crank Gear to Oil Pump Drive Gear, Backlash .......... 0.0410-0.123 mm (0.00162-0.00484 in.)
Idle Gear Side Clearance .......... 0.20-0.51 mm (0.0079-0.020 in.)

Electrical System (Alternator)

Stator, Resistance .......... Less than 1.0 ohm
Rotor, Resistance .......... 2.9 ohm
Slip Ring O.D. .......... 14.4 mm (0.567 in.)
Brush Length .......... 10.0 mm (0.394 in.)

Tightening Torque Specs

Cylinder head cover screw (M6 x 1), Nm (lb.-ft.) .......... 9.81-11.2 (7.24-8.31)
Cylinder head screw (M8 x 1.25), Nm (lb.-ft.) .......... 38-42 (28-31)
Flywheel screw (M10 x 1.25), Nm (lb.-ft.) .......... 54-58 (40-43)
Connecting rod screw (M7 x 0.75), Nm (lb.-ft.) .......... 27-30 (20-22)
Bearing case cover mounting screw (M6 x 1), Nm (lb.-ft.) .......... 9.81-11.2 (7.24-8.31)
Main bearing case screw 2 (M7 x 1), Nm (lb.-ft.) .......... 27-30 (20-22)
Main bearing case screw 1 (M6 x 1), Nm (lb.-ft.) .......... 13-15 (9.4-11)
Oil pressure switch (PT 1/8), Nm (lb.-ft.) .......... 15-19 (11-14)

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KUBOTA TRACTORS SPECIFICATIONS

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KUBOTA ENGINES DATA AND SERVICE SPECS

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KUBOTA FRONT END LOADERS

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KUBOTA TRACTORS TROUBLESHOOTING
L235 L2501 L2550 L275 L3110
L3301 L35 L3710 L3901 L4310
L5030 M4700 M5700 M6040 M6800
M8200 M8540 M9000 MX5100 MX5200