Allis-Chalmers 160 Tractor Shop Manual (1970–1975)

This shop manual covers the Allis-Chalmers Model 160 tractor with the Perkins AD 3.152 diesel engine and dual-range transmission.

Finding Service Text and Wiring Details

Text search and diagram detail: The PDF has searchable OCR text and bookmarks grouped by printed page range. Zooming in makes the wire-color labels easier to read, although some light-switch terminal markings remain hard to make out.

The ZIP download contains one printable PDF with 50 pages, including the title and index on the first PDF page.

Engine, Drivetrain, and Hydraulic Service

These are selected highlights from the shop manual. Other topics include front axle toe-in adjustment and front wheel bearing service.

• Engine repair: Cylinder head service, dry cylinder liner replacement, piston ring installation, and timing gear alignment.
• CAV fuel system: Fuel system bleeding, injector nozzle testing and overhaul, and injection pump removal, installation, and static timing.
• Tractor splits and drivetrain: Step-by-step procedures for front, clutch, and transmission splits, plus dual-disc clutch overhaul, PTO shaft service, and pinion depth and bearing preload adjustments.
• Rear axle and brakes: Rear axle shaft removal, differential lock removal and linkage adjustment, final drive gear service, and disc brake removal and adjustment.
• Hydrostatic steering: Troubleshooting, pump pressure and flow checks, system bleeding, steering control valve overhaul, and steering cylinder repair.
• Implement hydraulics: Traction Booster draft sensing, control linkage calibration, lift piston and seal service, and overhaul of the optional remote ram valves.
• Electrical system: Delco-Remy alternator testing and overhaul, regulator adjustments, starter test data, and the general wiring diagram.

This manual suits mechanics familiar with tractor splits and dial indicator measurements for setting bearing preload.

Perkins Engine and CAV Fuel System

The engine chapters cover the timing gear housing, camshaft, valve train, connecting rods and bearings, crankshaft inspection, rear oil seal replacement, and oil pump clearance checks. Cooling system service covers radiator removal, thermostat testing, and water pump overhaul.

The manual distinguishes early dual valve springs from the single-spring arrangement used after September 1970. It also gives separate tightening specs for plain and cadmium-plated connecting rod nuts. These distinctions help identify the right service data for an engine with earlier or replacement parts.

The timing gear illustration (Fig. 21) shows how the marks line up. The manual warns that independent movement of the camshaft or crankshaft during gear removal can damage valves or pistons.

The fuel system schematic (Fig. 48) shows the circuit layout. Injector nozzle tests cover opening pressure, seat leakage, back leakage, and spray pattern. The manual directs internal injection pump and governor overhaul to an authorized CAV service station.

Clutch, Transmission, and Final Drive

The two-stage pedal controls the transmission and PTO drives separately through a dry clutch. The manual distinguishes pedal free travel, internal release lever settings, and PTO clutch wear adjustment. It also shows how the clutch linkage operates the safety starting switch.

Transmission coverage includes the range gears, reverse gear cluster, shift rails, and interlocks. The synchromesh cutaway (Fig. 103) shows the synchronizer for fifth and sixth gears. These are the only synchronized gears, and both are locked out in low range.

Rear axle service includes bearing preload adjustment. Final drive procedures cover the bull gears and bull pinions, differential side bearing preload, and ring gear backlash. Tractor splits require secure support for the assemblies, and hydraulic pressure checks require test equipment rated for the pressures involved.

Hydraulic Lift and Hydrostatic Steering

The lift control valve sketch (Fig. 138) shows the valve’s oil paths. The adjustment sections cover slow lowering, lift arm height, sensitivity control, and sensing spring calibration.

The optional remote valves serve double-acting cylinders only. Main hydraulic pump service covers cleaning and replacing seals and gaskets. If internal wear prevents the pump from meeting pressure or flow specifications, the manual calls for pump replacement.

Steering has a separate belt-driven pump. The control valve exploded view (Fig. 5) identifies the locator bushing and bearing assembly used in different versions. Prying between the steering pump’s gasketless sections can damage the sealing faces and cause leaks under pressure.

Wiring, Service Data, and Shop Tool Drawings

The general wiring diagram (Fig. 146) identifies wire colors and connections for charging, starting, lighting, instruments, and the cold-start preheater. The Delco-Remy starter section gives no-load test data and drive pinion clearance.

The paragraph index helps locate repair procedures and reference data, including crankshaft journal, valve guide, and cylinder liner dimensions, component torque specs, fluid capacities, and wear limits. Dimensioned drawings help the shop make a clutch alignment tool, a pinion depth template, and a lift shaft bushing puller and installer.

Sample Valve Lash and Hydraulic Test Specs

For the Perkins engine, intake and exhaust tappet clearance is 0.010 inch hot or 0.012 inch cold. The adjustment section pairs those settings with illustrations of the valve positions.

For the implement lift, the manual specifies relief pressure of 2,300–2,400 psi at 800–1,000 engine rpm. It lists pump delivery separately at 6.7 gpm with the engine running at 2,250 rpm.