Specifications:  AC Model B-12 Tractor
 

Engine	Briggs & Stratton, Model 300421		Speeds –Standard Drive
Type	4 cycle air cooled		First gear	2 MPH
Horsepower	12		Second gear	3-3/4 MPH
Bore and Stroke	3-1/16” X 3-7/16”		Third gear	6 MPH
Displacement	30.16 cubic inches		Speeds – Optional Hi – Lo Drive
RPM	3600 max, full load		First gear	Hi 1.5 MPH Lo .8 MPH
Air cleaner	Oil foam		Second gear	Hi 3.5 MPH Lo 1.3 MPH
Starter	Electric & manual		Third gear	Hi 6.0 MPH Lo 2.2 MPH
Governor	Mechanical (flyweight)		Reverse	Hi 3.0 MPH Lo 1.1 MPH
Electrical system	12 volt, combination starter-generator		Dimensions
Ignition	Magneto		Height (at steering wheel)	37-1/4”
Transmission	Sliding spur gear and spiral bevel gear.  Three speeds forward and one reverse with standard drive.		Height (at hood line)	33-3/8”
	Six speeds forward and two reverse with optional Hi-Lo range pulley.		Width	34-1/4”
Differential	Planetary gear with controlled traction.		Length	68”
			Wheel tread	26”
Tire Pressures			Wheel base	44”
Rear (Standard Tractor)	8 PSI		Clearance (differential)	6”
Front (Standard Tractor)	12 PSI		Clearance (drawbar)	7”
Rear (With Loader)	20 PSI		Clearance (center housing)	15-1/4”
Front (With Loader)	14 PSI		Clearance (front axle)	9”
Rear (With Forklift)	20 PSI		Capacities
Front (With Forklift)	20 PSI		Engine case	4 pints
			Fuel tank	6 quarts
Battery	Allis Chalmers 40 ampere hour, 12 volt		Transmission	1-1/2 quarts, SAE 90 oil
Shipping Weight	Approximately 680 pounds		Bevel gear housing	1 pint, SAE 90 oil

Source:  AC Service Manual, B SERIES TRACTORS, Part No 9003453, February 1976

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