1957–1968 Allis-Chalmers D-14, D-15 & D-17 Tractor Shop Manual (OEM)

• Exact model and axle coverage: D-14, D-15, D-15 Series II, D-17, D-17 Series III, and D-17 Series IV tractors, with single- and dual-wheel tricycle, adjustable-front-axle, and heavy-duty non-adjustable wide-front-axle service identified by model and production change. D-14 coverage is non-diesel only.

• Engine repair procedures cover removal with the clutch, cylinder heads, valves and guides, rocker arms, timing covers and gears, camshafts, wet sleeves, pistons, connecting rods, crankshafts, oil seals, oil pumps, flywheels, and oil pans for the applicable diesel and non-diesel builds.

• Fuel, ignition, and electrical work addresses Marvel-Schebler and Zenith carburetors, the Ensign LP-Gas regulator, Roosa-Master injection timing, injector-nozzle testing and overhaul, fuel-system bleeding, Delco-Remy ignition/charging/starting units, and model-specific electrical test data.

• Powertrain repair coverage runs from engine clutch service and tractor splitting through Power-Director wet-clutch adjustment and overhaul, optional shuttle-clutch oil-cooler service, transmission shaft and shifter work, PTO components, and the belt-pulley drive.

• Hydraulic diagnosis and repair is divided between the cam-driven plunger-pump Traction-Booster system and the D-15 and Series IV D-17 side-mounted gear-pump systems, with pump and valve overhaul, pressure/flow testing, bleeding, linkage adjustment, remote controls, cylinders, and three-point hitch work.

• Rear chassis and diagram coverage includes bull gears and pinions, axle shafts, final drives, differential overhaul, bevel-gear mesh and backlash setup, D-17 shoe-type and Bendix band/disc brakes, sectional and exploded views, and 11 model-, series-, and fuel-specific wiring diagrams.

This 92-page PDF starts with the manual's printed page 2 and continues through printed page 93. It is a compact shop manual organized around numbered component procedures, rather than an operator's manual or parts catalog. The material is suited to experienced mechanics and owners who can safely split and support a tractor, use pullers and presses, take precision measurements, and perform hydraulic and electrical tests.

Engine and Build Identification

The opening data separates the 149-cu.-in. non-diesel D-14; 149-cu.-in. non-diesel and 175-cu.-in. diesel D-15; 160-cu.-in. non-diesel and 175-cu.-in. diesel D-15 Series II; and 226-cu.-in. non-diesel and 262-cu.-in. diesel D-17 builds. Those distinctions carry into valve, timing, bearing, oiling, fuel, cooling, and electrical specifications.

Production breaks are handled at component level. D15-9001 changes front-hub sealing and plunger-pump intake-valve construction. On the D-17, D17-38899 changes transmission sealing, bearing-retainer details, and bevel gears to a matched set; D17-42001 separates earlier shoe brakes from the later Bendix band/disc system and also changes power-steering and plunger-pump details. D17-75001 identifies the Series IV clutch-driven, side-mounted hydraulic pump arrangement. Engine-specific notes cover the D-17 non-diesel change at 17-19978 and the late diesel water-pump design at 119938, including the 117087-117104 exception.

Procedure and Specification Depth

Transmission and differential chapters document bearing preload and end-play setup, selective snap-ring and shim use, gear backlash, tooth-contact checks, and bevel-pinion mesh positioning. Hydraulic sections explain the hold, unloading, relief, discharge, sensing, and remote-control valve functions before moving into pressure and flow checks, pump overhaul, lift-cylinder leakage tests, and Traction-Booster, position-control, torsion-bar, and self-canceling adjustments.

The diesel chapter covers fuel-system fault isolation, nozzle leakage/spray/opening-pressure tests, nozzle and holder repair, energy-cell cleaning, injection-pump timing by pump part number, and pump removal and installation. It does not provide an internal Roosa-Master pump rebuild; adjustments requiring the pump cover to be opened are reserved for experienced diesel-pump personnel.

Named service equipment includes Ensign gauge 8276, Kent-Moore J-6902, American Bosch kit TSE 7779, and an OTC Y 81-21 hydraulic tester. Figure 106 also shows a fabricated Power-Director hollow-shaft removal tool based on Allis-Chalmers nut P/N 229428. Reference data covers component torque, clearances and wear limits, bearing end play, spring tests, lubrication and capacities, hydraulic pressure/flow, and electrical unit tests.

Drawings and Shop Cautions

The figure sequence runs through Fig. 194. Particularly useful examples are the power-steering front-support exploded view (Fig. 23), diesel timing-gear layout (Fig. 44), nozzle-tester setup (Fig. 71), D-17 Power-Director clutch exploded view (Fig. 98), D-17 transmission cross-section (Fig. 125), and plunger-pump cutaway (Fig. 146). Wiring Figs. 184-194 distinguish D-14, both D-15 generations, and early, Series III, and Series IV D-17 non-diesel and diesel systems.

The plunger-pump chapter warns that an incorrectly seated linkage roller can damage the linkage when the cover screws are tightened. The gear-pump chapters likewise caution against prying the sections apart because the sealing faces can be damaged. Securely support separated tractor sections, release hydraulic pressure, and follow the applicable OEM information and standard shop safety practices before beginning repair work.