Specs Hub › Allis-Chalmers › D14
About this model: The Allis-Chalmers D14 was produced from 1957 to 1960 as part of the D-Series lineup. It was powered by a 149 cubic inch four-cylinder gasoline engine governed at 1,650 RPM. The D14's standout feature was the Power Director — a hand-operated dual-range wet clutch system that allowed on-the-go range shifting without stopping or declutching. Combined with a constant-mesh four-speed transmission, this gave the D14 eight effective forward speeds. The specifications below are sourced directly from the factory operator's manual (TM-137 C) and cover all major systems.
Quick Navigation
Engine
| Item |
Specification |
| Type |
4-Cylinder Gasoline |
| Bore |
3-1/2 in. |
| Stroke |
3-7/8 in. |
| Piston Displacement |
149 cu. in. |
| Firing Order |
1-2-4-3 |
| R.P.M. (Governed) |
1,650 |
| R.P.M. (High Idle) |
1,975 – 2,075 |
| R.P.M. (Low Idle) |
525 – 575 |
| Oil Sump Capacity |
4 qts. (add 1 extra qt. when changing filter) |
Ignition & Spark Plugs
| Item |
Specification |
| Distributor Point Gap |
.020 in. |
| Distributor Rotation |
Clockwise (from cap end) |
| Spark Advance |
Automatic 30° @ 1,000 RPM and above |
| Spark Plug Size |
14 mm |
| Spark Plug Point Gap |
.028 in. – .033 in. |
Valves
| Item |
Specification |
| Tappet Clearance (Hot) |
.012 in. – .014 in. |
Clutches
| Item |
Specification |
| Engine Clutch Type |
Single Plate – Dry Disc |
| Engine Clutch Diameter |
9 in. |
| Engine Clutch Operation |
Foot Operated |
| Power Director Type |
Dual Range – High/Low – Wet |
| Power Director Operation |
Hand Operated |
| Power Director Capacity |
10 qts. |
| Power Director Plate Diameter |
7 in. (3 plates per clutch) |
Transmission & Ground Speeds
Constant mesh transmission, 14-1/2 qt. capacity. Ground speeds vary by rear tire size — confirm your tire size before referencing speed figures.
| Gear |
11×26 Tires (Standard) |
12×26 Tires (Optional) |
| High Range |
| 1st |
2-1/5 mph |
2-1/4 mph |
| 2nd |
3-3/4 mph |
4 mph |
| 3rd |
4-3/4 mph |
5 mph |
| 4th |
12 mph |
12-4/5 mph |
| Reverse |
3-3/4 mph |
4 mph |
| Low Range |
| 1st |
1-1/2 mph |
1-3/5 mph |
| 2nd |
2-3/5 mph |
2-4/5 mph |
| 3rd |
3-2/5 mph |
3-3/5 mph |
| 4th |
8-1/2 mph |
9 mph |
| Reverse |
2-3/5 mph |
2-4/5 mph |
Power Take-Off
| Item |
Specification |
| Spline Size |
1-3/8 in. |
| Shaft Speed @ 1,650 Engine RPM |
549 RPM |
| Shaft Speed (High Idle) |
651 – 690 RPM |
| Shaft Speed (Low Idle) |
175 – 190 RPM |
Belt Pulley (Optional)
| Item |
Specification |
| Diameter |
9 in. |
| Face |
6-1/2 in. |
| R.P.M. @ 1,650 Engine Speed |
1,384 |
| Ft. per min. @ 1,650 Engine Speed |
3,260 |
Brakes
| Item |
Specification |
| Type |
Internal Expanding |
| Operation |
Foot Operated |
| Diameter |
7 in. |
Hydraulic System
| Item |
Specification |
| Pump Type |
4 Plunger – Variable Delivery |
| System Capacity |
9 qts. |
Radiator & Cooling System
| Item |
Specification |
| Capacity |
9 qts. |
Fuel System
| Item |
Specification |
| Main Tank Capacity |
14 Gal. |
| Auxiliary Tank (Low Grade Fuel) |
3/4 Gal. approx. |
Electrical System
| Item |
Specification |
| Battery |
6 Volt – 15 Plate |
| Battery Capacity |
100 Ampere Hour |
Steering
The D14 was available with standard or optional power steering. Both use a semi-reversible design with the same gear ratio.
| Item |
Power Steering |
Standard Steering |
| Type |
Semi-Reversible |
Semi-Reversible |
| Ratio |
13.3 to 1 |
13.3 to 1 |
| Capacity |
1 Gal. |
2-1/2 qts. |
Tires & Tire Pressure
| Item |
Specification |
| Front Tire Size |
5.50 × 16 |
| Rear Tire – Standard |
11 × 26 |
| Rear Tire – Optional |
12 × 26 |
| Front Tire Pressure |
28 lbs. |
| Rear Pressure – 11×26 Standard |
12 lbs. |
| Rear Pressure – 12×26 Optional |
14 lbs. |
| Liquid Ballast – 11"×26" Tire (Calcium Chloride Solution) |
31 Gal. |
Wheel Tread
Rear wheel tread is adjustable using the power shift system in 2-1/2 inch increments.
| Item |
Specification |
| Rear Standard |
54 in. – 74 in. |
| Rear Reversed |
60 in. – 80 in. |
| Adjustable Front Standard |
51 in. – 71 in. |
| Adjustable Front Reversed |
58 in. – 78 in. |
Wheel Weights (Optional)
| Item |
Specification |
| Rear – Segment Type (4 per wheel) |
65 lbs. each |
| Front – One Piece |
90 lbs. |
Dimensions & Weight
| Item |
Specification |
| Height Over-All |
79-9/16 in. |
| Wheel Base |
85-3/4 in. |
| Over-All Length (to end of drawbar) |
129 in. |
| Over-All Length (tire to tire) |
123-1/2 in. |
| Turning Radius (with brake) |
8 ft. 1 in. |
| Shipping Weight |
4,170 lbs. |
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