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

This Allis-Chalmers tractor shop manual covers the D-14, D-15, D-15 Series II, D-17, D-17 Series III, and D-17 Series IV. D-14 coverage is non-diesel only. Numbered component procedures distinguish the applicable diesel and non-diesel builds.

PDF Search, Bookmarks and Wiring Detail

Text search and diagram access: Searchable text is available throughout the PDF, with occasional recognition errors. Page-range bookmarks are partly usable; several have broken destinations. Small wiring-diagram labels require zooming.

The ZIP download contains one printable English-language PDF with 92 pages, running from printed page 2 through printed page 93.

Engine, Power-Director and Hydraulic Repair

The following selected repair topics outline the manual’s coverage rather than reproduce its full index. Additional subjects include governor linkage adjustments and optional hydraulic selector and transport valves.

• Engine repair: Step-by-step engine removal, cylinder-head service, wet-sleeve and piston work, connecting-rod and crankshaft inspection, oil-pump overhaul, and oil-seal replacement.

• Fuel systems: Marvel-Schebler and Zenith carburetor service, Ensign LP-Gas regulator overhaul, Roosa-Master injection timing, injector-nozzle testing and repair, and fuel-system bleeding.

• Ignition and electrical: Delco-Remy ignition timing and generator, voltage-regulator, and starting-motor test specifications, supported by 11 model-, series-, and fuel-specific wiring diagrams.

• Clutch and drivetrain: Tractor splitting, engine-clutch service, Power-Director wet-clutch adjustment and overhaul, optional shuttle-clutch oil-cooler service, transmission shafts and shifters, PTO, and belt-pulley drive.

• Front axle and steering: Wheel-hub and spindle service, manual steering-gear overhaul, power-steering pressure checks, pump and control-valve repair, steering-cylinder service, and bleeding.

• Hydraulic power lift: Cam-driven plunger-pump and side-mounted gear-pump systems, including pressure and flow testing, pump and valve overhaul, linkage adjustments, remote controls, and three-point hitch service.

• Rear chassis: Bull gears and pinions, axle shafts, final drives, differential overhaul, bevel-gear mesh and backlash setup, and model-specific shoe and Bendix band/disc brakes.

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 Builds and Cooling-System Changes

Separate procedures address valves and guides, rocker arms, timing covers and gears, camshafts, flywheels, and oil pans. Component data includes torque specifications, bearing clearances, wear limits, spring tests, lubrication information, and capacities.

D-17 non-diesel oiling: The change at engine serial 17-19978 affects the camshaft and oil-pump drive gears as well as the move from bypass to full-flow filtration. The cylinder-block replacement section explains the related conversion requirements.

Diesel water pumps: The early D-17 procedure applies before engine serial 119938, except 117087 through 117104. The late procedure covers engines after 119938 and that exception group. Kent-Moore J-6902 is identified for seal installation.

Diesel Diagnosis and LP-Gas Service

The Diesel System Trouble Shooting Chart links starting, power, running, smoke, and fuel-consumption symptoms to further checks. Nozzle coverage distinguishes leakage, spray-pattern, and opening-pressure tests, with separate procedures for nozzle-body and holder service.

The manual also covers energy-cell cleaning and injection-pump timing by pump part number. 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.

American Bosch kit TSE 7779 is identified for centering applicable nozzle tips. The Ensign LP-Gas section explains regulator operation, symptom-based checks, and overhaul, with gauge 8276 used for inlet-valve lever setting.

Transmission Setup and Production Changes

Transmission and differential procedures explain bearing preload and end-play checks, selective snap-ring and shim use, tooth-contact inspection, and bevel-pinion positioning.

The production-change information helps match parts and overhaul procedures to the tractor’s actual build. At D17-38899, the bevel pinion and ring gear become a matched service set, with a corresponding mesh-position selection procedure.

Figure 106 shows a fabricated Power-Director hollow-shaft removal tool based on Allis-Chalmers nut P/N 229428. PTO shaft, idler-gear, and driven-gear work is covered separately from the belt-pulley assembly and its drive.

Plunger-Pump and Gear-Pump Hydraulics

The plunger-pump section explains hold, unloading, relief, discharge, and control-valve functions before covering tests and overhaul. Lift-cylinder leakage checks address oil transfer from the hydraulic compartment into the transmission.

The D-15 high-volume gear pump requires control valves specified for that system. Series IV D-17 coverage adds torsion-bar, Traction-Booster, position-control, lowering-rate, and self-canceling adjustments. An OTC Y 81-21 hydraulic tester is identified for the complete system check.

The plunger-pump chapter warns that an incorrectly seated linkage roller can damage the linkage when the cover screws are tightened. Gear-pump overhaul sections caution against prying the sections apart because the sealing faces can be damaged.

Assembly Views and Wiring Diagrams

Illustrations include 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 both D-15 generations and early, Series III, and Series IV D-17 electrical layouts, alongside the D-14 diagram.

Securely support separated tractor sections, release hydraulic pressure, and follow the applicable OEM information and standard shop safety practices before beginning repair work.

Examples of Valve and Wet-Clutch Adjustment Data

For D-15 non-diesel engines, the tappet-adjustment section specifies hot clearances of 0.008–0.010 inch at the intake valves and 0.014–0.016 inch at the exhaust valves. These appear with model-specific valve-adjustment illustrations.

For the Power-Director clutch, the manual specifies 0.042–0.046 inch of Belleville spring-washer compression with the clutch pack engaged. The accompanying discussion relates insufficient compression to slipping and excessive compression to incomplete release.