Allis Chalmers D15 Overview
The Allis Chalmers D15 ran from 1960 through 1968 with gasoline, LP-gas, and diesel configurations. Gasoline and LP-gas tractors use the 149 cubic inch (2.4 L) engine family, while diesel tractors use the 175 cubic inch (2.9 L) D-175 engine.
Match the tractor's fuel type, serial range, transmission, PTO setup, and hitch equipment before ordering parts or comparing service information.
Nebraska Tests 795, 796, and 797 cover different D15 fuel versions. Tested PTO and drawbar output varies by fuel, so use the report that matches the tractor.
Allis Chalmers D15 Quick Answers
- Production yearsThe Allis Chalmers D15 was produced from 1960 through 1968, with 7,169 total units listed.
- PowerNebraska power varies by fuel: Test 795 gas 40.00 PTO/35.33 drawbar hp; Test 796 diesel 36.51/33.32; Test 797 LP-gas 37.44/33.22.
- EngineGasoline and LP-gas D15 tractors use a 149 ci engine; diesel tractors use the 175 ci D-175.
- PTO and hitchThe rear PTO is live 540 rpm, with Snap-Coupler equipment and a Category II/I hitch listing.
- Service capacityListed capacities are 5 qts engine oil, 2.5 gal hydraulic system, and 11 qts coolant; confirm fluids and filters from a manual.
Engine and Power
D15 engine data splits the 149 ci gasoline and LP-gas tractors from the 175 ci diesel. Nebraska Tests 795, 796, and 797 provide the matching fuel-specific PTO and drawbar results.
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
Transmission
Check the installed gear set before ordering clutch or transmission parts, because service references can vary by configuration.
PTO and Hitch
The D15 uses a live 540 rpm rear PTO. Tested PTO output depends on the matching Nebraska fuel-version report, so compare implements against the tractor's actual equipment and serial range.
Rear PTO
Rear PTO type
Rear hitch
Hydraulics
Hydraulic capacity is listed at 2.5 gal with 2300 psi pressure. Remote-valve equipment and implement setup can still vary by tractor.
Capacity
Pressure
Fluids, Battery, and Service Facts
Service facts cover engine oil, hydraulic capacity, coolant, and electrical basics. Use a manual or parts catalog for fluid type, filters, belts, and battery fitment.
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
Use the D15 serial rows as a year guide, then confirm prefixes, regional build details, and serial breaks against supporting documentation.
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.
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.
Manual
- Allis Chalmers D15 Tractor Operators Manual AC-O-D15DSLoperation, lubrication, specifications
Diesel variant operator manual for Allis-Chalmers D-15; provides operation, lubrication, and general specifications.
Open source - Allis Chalmers D15 Tractor Service Manual AC-S-D15operation, maintenance, specifications
Service manual for D-15 (Gasoline and Diesel), including Series II; covers maintenance and repair procedures.
Open source
Parts catalog
- Allis-Chalmers Tractor Parts Catalog DJS-2025 (D14/D15/D17)parts matching
Parts catalog covering D14, D15, D17 family; includes D-15 applicable parts diagrams and part numbers.
Open source
Tractor test report
- Test 795: Allis-Chalmers D15 (Gasoline)tested performance
Official Nebraska report for the gasoline Allis-Chalmers D15, with PTO and drawbar performance tables.
Open source - Test 796: Allis-Chalmers D15 (Diesel)tested performance
Official Nebraska report for the diesel Allis-Chalmers D15, with PTO and drawbar performance tables.
Open source - Test 797: Allis-Chalmers D15 (LPG)tested performance
Official Nebraska report for the LP-gas Allis-Chalmers D15, with PTO and drawbar performance tables.
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.