John Deere 3050/3350/3650 Tractor Technical Manual, 1987–1990 (P/N TM4443)

John Deere Technical Manual P/N TM4443, November 1990 edition, covers 1987–1990 John Deere 3050, 3350 and 3650 tractors. Published by John Deere Werke Mannheim, it documents tractor repair, component inspection, adjustments and scheduled service.

PDF Access, Section Bookmarks and Page Count

Section navigation and wiring detail: Embedded bookmarks open the main manual sections. PDF text search is not available. Small labels in the wiring-harness illustrations require zooming.

One printable English-language PDF contains 785 pages, including the front and rear covers, a four-page specification summary and three pages of contents and section guides.

Tractor Separation, Drivetrain and Hydraulic Repair

The following selected contents outline the repair coverage rather than reproduce the full contents list. Other topics include headlight adjustment and operator-seat assembly illustrations.

• Tractor separation and clutch service: Step-by-step procedures for major component removal, engine-clutch inspection, hydraulic clutch-cylinder repair and clutch operating-system adjustment.

• Transmission and PTO: Hi-Lo shift-unit overhaul, mechanical and hydrostatic creeper repair, synchronizer inspection, differential adjustment, final drives, and rear and front PTO clutch service.

• Hydraulics and hitch: Hydraulic-pump disassembly, rockshaft repair and adjustment, spool- and poppet-type selective control valves, ISO couplers and remote-cylinder service.

• Steering and brakes: Hydrostatic steering-valve overhaul, steering-cylinder repair without front-wheel drive, brake-valve inspection, brake bleeding, handbrake adjustment and hydraulic trailer-brake repair.

• Electrical repair: Serial-specific wiring-harness layouts, connector replacement, starter and alternator disassembly, winding and diode tests, and digital speed-hour-meter setup.

• Cooling and fuel systems: Radiator and viscous fan-drive removal, belt checks, fuel-tank repair, water-trap service, cold-starting aids and throttle-linkage adjustment.

• SG2 cab and climate control: Air-conditioning service, compressor repair, standard and low-profile cab heating, window replacement, and SG2 cab and RG2 roll-guard mounting work.

This manual is suited to mechanics experienced in tractor disassembly and component repair, with access to splitting stands, lifting equipment and electrical test instruments.

Engine Repair and Diagnostic Scope

Separate engine publication: Internal engine repair and service of the fuel transfer pump, injection equipment and turbocharger are assigned to Technical Manual—Engines 3179, 4239 and 6359. That engine manual is not included.

Several system-level diagnostic checks also refer to the separate Operation and Tests manual. This repair volume supplies component inspections, adjustment procedures and reference specifications, rather than replacing that diagnostic publication.

Separation Planning and Drivetrain Variants

The manual organizes tractor systems into dedicated groups. Separation procedures identify the connections, supports and special tools involved in removing the engine, clutch housing, transmission, final drives and cab. Dimensioned lifting-device drawings support workshop fixture preparation, including a device for hydrostatic creeper removal.

Hi-Lo sectional views distinguish the different road-speed configurations. Transmission chapters cover bearing preload, rolling drag torque, synchronizer inspection and shift-fork adjustment. PTO illustrations distinguish handshift and interchangeable-stub-shaft assemblies, while front PTO coverage separates clockwise and counterclockwise versions.

Predelivery and after-sales inspections accompany lubrication charts, fluid capacities and service intervals. Lubrication instructions address front axles, PTO components and three-point hitches.

Hydraulic Pumps, Rockshaft and Control Valves

Pump repair distinguishes versions with and without through drive. Rockshaft adjustments are separated by cab configuration and include load-and-depth functional checks.

The pump chapter warns that mixing early and later stroke-control valve housings can misalign high-pressure passages, causing hydraulic damage and a high-pressure leak. Selective-control-valve sections add valve-seat inspection, linkage adjustment and functional checks.

Electrical Layouts and Component Tests

Illustrated references include engine wiring harnesses, SG2 low-profile cab wiring, hydrostatic creeper wiring, Hi-Lo sectional views, the steering-valve sectional view and hydraulic-pump exploded views.

Starter tests address armature grounds, short circuits and commutator condition. Alternator coverage includes rotor, stator and diode testing. Battery-service cautions identify reversed polarity as a cause of immediate rectifier-diode damage.

Front Axles, Brakes and Cab Equipment

Front-wheel-drive limits: Tractor-level axle removal, driveline and engagement-clutch work are included. Internal repair of APL-345 and APL-350 front-wheel-drive axles, including their steering cylinders, requires the separate axle manual CTM-4421.

Brake sections include pressure-ring leakage and return-movement checks. Cab coverage distinguishes compressor designs by tractor serial number and includes refrigerant-system leak testing. Air-conditioning work is assigned to authorized, trained personnel.

Working on heavy agricultural machinery poses crush and high-pressure hazards. Follow the manual’s support, lifting and hydraulic-pressure precautions.

A Preview of Cooling, Engine and Hi-Lo Specifications

Cooling-system capacity is listed as 17 liters (4.5 U.S. gal.) without an SG2 cab and 19 liters (5.0 U.S. gal.) with an SG2 cab.

Engine reference data lists main-bearing fasteners to the cylinder block at 120 Nm (85 ft-lb). Fuel-injection pump timing for the 3650 is specified as TDC; the checking procedure is assigned to the separate engine manual.

The Hi-Lo reference table lists operating pressure at 1050 kPa (150 psi) with the engine running at 1500 rpm.