Allis Chalmers D15 Overview
The Allis Chalmers D15 was built during the 1960s as a compact, versatile tractor for row-crop work and general farm tasks. Two engine options appeared in this line: a 149 cubic inch (2.4 L) gasoline unit and a 175 cubic inch (2.9 L) diesel, each pairing with a straightforward, robust mechanical layout.
It uses manual steering and a Category II/I rear hitch, with a rear PTO arrangement suited to common implement pairings; hydraulics provide capable performance for typical farm tasks. The D15’s simple service envelope makes parts and maintenance approachable for owners and restorers when configured correctly.
Manuals and Nebraska Tractor Test Reports provide context for operation and performance, while serial ranges and configuration details guide parts matching. Match the tractor’s model code, serial range, engine, transmission, and PTO setup before ordering parts or performing service.
Allis Chalmers D15 Quick Answers
- Production yearsThe Allis Chalmers D15 was produced from 1960 through 1968.
- PowerPublished power data includes 40.0 hp (29.8 kW) with drawbar around 35.33 hp (26.3 kW). Configuration matters; verify the exact engine/transmission setup for your tractor before treating these as universal figures.
- EngineEngine options include 149 ci (2.4 L) gasoline and 175 ci (2.9 L) diesel.
- PTO and hitchRear PTO and a Category II/I rear hitch are standard considerations for implement compatibility.
- Service capacityCapacities published: engine oil 5 qts (4.7 L); hydraulic system 2.5 gal (9.5 L); coolant 11 qts (10.4 L).
Engine and Power
Engine options and power context: The Allis Chalmers D15 offered 149 ci gasoline and 175 ci diesel engines, both rated around 2000 rpm. Air cleaning uses an oil-bath system, and ignition/timing references follow standard Allis Chalmers practice for the period.
Gasoline engine
Allis Chalmers / gasoline / 4-cylinder / liquid-cooled
| Displacement | 149 ci 2.4 L |
|---|---|
| Bore Stroke | 3.50x3.875 inches 89 x 98 mm |
| Fuel Use | 3.373 gal/hour 12.8 l/hour |
| Air Cleaner | oil bath |
| Compression | 7.75:1 |
| Rated Rpm | 2000 |
| Firing Order | 1-2-4-3 |
| Starter Volts | 12 |
| Sparkplug Gap | 0.025 inches 0.635 mm |
| Point Gap | 0.022 inches 0.559 mm |
| Intake Valve Clearance | 0.009 inches 0.229 mm |
| Exhaust Valve Clearance | 0.015 inches 0.381 mm |
LP-gas engine
Allis Chalmers / LP gas / 4-cylinder / liquid-cooled
| Displacement | 149 ci 2.4 L |
|---|---|
| Bore Stroke | 3.50x3.875 inches 89 x 98 mm |
| Fuel Use | 3.992 gal/hour 15.1 l/hour |
| Air Cleaner | oil bath |
| Compression | 8.9:1 |
| Rated Rpm | 2000 |
| Firing Order | 1-2-4-3 |
| Starter Volts | 12 |
Diesel engine
Allis Chalmers D-175 / diesel / 4-cylinder / liquid-cooled
| Displacement | 175 ci 2.9 L |
|---|---|
| Bore Stroke | 3.5625x4.375 inches 90 x 111 mm |
| Fuel Use | 2.871 gal/hour 10.9 l/hour |
| Air Cleaner | oil bath |
| Compression | 15.35:1 |
| Rated Rpm | 2000 |
| Firing Order | 1-3-4-2 |
| Starter Volts | 12 |
| Coolant Capacity | 11 qts 10.4 L |
| Intake Valve Clearance | 0.010 inches (hot) 0.254 mm |
| Exhaust Valve Clearance | 0.019 inches (hot) 0.483 mm |
Manufacturer
Manufacture years
Tested PTO
Tested drawbar
PTO and Hitch
PTO and hitch: Rear PTO is standard on many configurations, paired with a Category II/I rear hitch. Match implement requirements to the tractor’s configuration and serial range for reliable performance.
Rear PTO
Rear PTO type
Rear hitch
Hydraulics
Hydraulics: The D15 uses a hydraulic system designed for common implements, with a nominal pressure and capacity that affect remote valves and lift capabilities depending on configuration.
Capacity
Pressure
Fluids, Battery, and Service Facts
Maintenance context: published capacities include engine oil, hydraulic fluid, coolant, and electrical specs. Specific fluid types, filter numbers, belts, and battery group vary by setup; rely on a parts catalog or manual for exact service parts.
Fuel tank
Engine oil capacity
Hydraulic system
Battery volts
Battery Ah
Tires and Dimensions
Tire and dimension values can vary by wheel, axle, and configuration.
Configuration-specific values are split out where the same model has documented differences by engine, transmission, or equipment.
Wheelbase
Weight
Length
Width
- 6.5625 inches 16 cm
- 67 inches 170 cm
Front tire
Rear tire
Ag front
- 5.50-16
- 6.00-16
Ag rear
- 12.4-26
- 13.6-26
Electrical
Electrical rows are included when documented.
Ground
Battery volts
Serial Number Lookup
Serials: serial-year mapping helps narrow the D15 by configuration. Factory prefixes and regional builds exist; apply serial-range rules only within the documented ranges.
1960
1961
1962
final
location
Manuals and Documents
Documents below add manual, parts, and test context for Allis Chalmers D15. They are useful for controls, service categories, parts matching, and tested-performance details that do not fit into short spec rows.
Match coverage carefully before relying on a document for service decisions, especially when a single manual, catalog, or report covers several models, fuel types, transmissions, or tractor variants.
- Allis Chalmers D15 Tractor Operators Manual AC-O-D15DSLDiesel variant operator manual for Allis-Chalmers D-15; covers operation, lubrication, and general specifications.Open source
- Allis Chalmers D15 Tractor Service Manual AC-S-D15Service manual for D-15 (Gasoline and Diesel), including Series II; covers maintenance and repair procedures.Open source
- Allis-Chalmers Tractor Parts Catalog DJS-2025 (D14/D15/D17)Parts catalog covering D14, D15, D17 family; includes D-15 applicable parts diagrams and part numbers.Open source
- Test 795: Allis-Chalmers D15 (Gasoline)Nebraska Tractor Test Report, Gasoline variant of Allis-Chalmers D15; historical performance data reference.Open source
- Test 797: Allis-Chalmers D15 (LPG)Nebraska Tractor Test Report, LPG variant of Allis-Chalmers D15; corroborates OECD-style testing context.Open source
Parts Checks Before Ordering
Do not order Allis Chalmers D15 parts from the model name alone. Match the part to the tractor's model code, serial range, engine, transmission, PTO setup, and build year before choosing service parts.
Filters, fluids, belts, electrical parts, clutch and PTO parts, and hydraulic parts can vary by setup. Exact part numbers need a parts catalog, manual, or trusted supplier source before they become recommendations.
Accuracy Note
Tractor specifications can vary by year, region, factory configuration, installed equipment, and later repairs. Match serial range, engine, transmission, PTO setup, and model code before ordering parts or doing service work.