Kubota AD70 Diesel Tiller Specifications

The Kubota AD70 is the diesel member of Kubota's walk-behind rotary tiller line, sitting alongside the gasoline AT55, AT60 and AT70S models. It runs Kubota's E70–TB horizontal water-cooled 4-cycle diesel — radiator-cooled, with a precombustion swirl chamber, BOSCH injection pump and nozzle, and electric starting — rated at 7.0 hp SAE gross at 2500 rpm. Compared with the gasoline machines it carries three forward speeds instead of two, larger 4.00–9 tires, and a considerably higher 200 kg (440 lbs.) operating weight, while sharing the same center-drive rotary unit: 500 mm (20 in.) standard tilling width, 360 mm (14.1 in.) rotor, and 12 blades. All figures below are transcribed directly from the factory manual.

Machine Dimensions & Weight

Specification	AD70
Overall length	1810 mm (71.3 in.)
Overall width	760 mm (29.9 in.)
Overall height	1060 mm (41.7 in.)
Track	284 to 538 mm (11 to 21 in.)
Weight	200 kg (440 lbs.)

Engine

Specification	AD70
Engine model	Kubota E70–TB
Type	Horizontal water-cooled, 4-cycle diesel engine
Displacement	309 cc (18.86 cu. in.)
Maximum horsepower (SAE gross)	7.0 hp / 2500 rpm
Fuel used	Diesel fuel
Fuel tank capacity	3.0 L (0.79 U.S. gal.)
Cooling system	Radiator
Combustion system	Precombustion swirl chamber
Lubricating oil	API service CC, CD class (SAE 30, 20, 10W, 10W-30)
Lubricating system	Forced lubrication with trochoid pump
Fuel injection pump	BOSCH “mini” type
Nozzle type	BOSCH “throttle” type
Air cleaner	Cyclone type centrifugal air cleaner
Starting system	Electric starter

Tire, Clutches & Handle

Specification	AD70
Tire	4.00–9
Power clutch	Safety control grip
Wheel clutch	Available
Handle bar	3-stage vertically adjustable
Handle	Swing

Travelling Speeds (Number of Gears)

Specification	AD70
Forward	3
Reverse	1

Rotary Unit

Specification	AD70
Drive system	Center drive system
Tilling width	500 mm (20 in.) — 630 mm (24.8 in.) optional
Rotor diameter	360 mm (14.1 in.)
Number of blades used	12 (16 optional)
Tine clutch	Standard
Depth regulator	Adjustable from 1 to 7 inches deep in 1 inch increments

Tine Speeds & Direction

Direction	Auxiliary chain case speed^†	Tine speed
Forward	Low	207 rpm
Forward	High	350 rpm
Reverse	Low	207 rpm^‡
Reverse	High	350 rpm^‡

Travelling Speeds (at 2500 Engine RPM)

Vehicle speed	Axle rotating speed	Travelling speed
1st forward	12.0 rpm	1.10 km/h (0.63 mi/h)^§
2nd forward	16.8 rpm	1.41 km/h (0.88 mi/h)
3rd forward	63.6 rpm	5.33 km/h (3.33 mi/h)
Reverse	13.0 rpm	1.10 km/h (0.69 mi/h)

^† In the source table these Low/High figures sit under a heading reading "Auxiliary chain case / Speed." The heading is reproduced here as printed; the manual's operating section should be consulted for how the Low and High positions are selected.
^‡ The manual prints identical tine speeds for forward and reverse rotation (207 rpm low, 350 rpm high). This is transcribed as printed and is not a duplication error; note that it differs from the AT60/AT70S table, where reverse tine speeds are printed slightly lower than forward.
^§ The manual prints 1.10 km/h for 1st forward, but the paired 0.63 mi/h figure converts to approximately 1.01 km/h, and 1.01 km/h is what the 12.0 rpm axle speed produces at the ratio implied by the other three rows (2nd forward, 3rd forward and reverse are all internally consistent). The printed value appears to be a transposition of 1.01. Both figures are shown as printed here rather than corrected.

Need the operator's manual for your Kubota AD70?

Get the complete factory operator's manual as an instant PDF download — with operating, adjustment and maintenance procedures for the AD70 diesel tiller.

Get the AD70 Operator's Manual →