1950–1955 Massey Ferguson TO-30, TO-20, TE-20 & TE-A20 Tractor Parts Catalog (P/N 693 041 M4)

Parts catalog for 1950–1955 Massey Ferguson TO-20, TO-30, TE-20, and TE-A20 utility tractors, publication 693 041 M4, Issue 1, first printing dated 5/73. The catalog separates TE-A20 80 mm and 85 mm engine configurations and includes a dedicated section for TO-D20 fuel-oil model parts.

Search, navigation, and page completeness: PDF text search is partial because OCR errors affect words and part numbers; there are no embedded bookmarks. Small electrical drawing callouts require zooming. The TE-A20 piston parts list on printed page 15 is blank, electrical-accessory parts list page 83 is missing, and front axle drawing page 84 appears twice. Carburetor pages 44–49 are out of sequence.

• Engine components: Exploded views and parts listings for the cylinder block, cylinder head, crankshaft, valve gear, lubrication components, and engine gasket kit.

• Fuel and cooling: Carburetor component breakdowns, fuel tank and filter listings, radiator and water pump parts, and throttle, choke, and governor linkages.

• Transmission and chassis: Transmission, differential, clutch, brake, front axle, and steering gear parts, with model columns and component-specific applicability notes.

• Hydraulic lift: Hydraulic pump, lift cover and controls, lift shaft, and linkage breakdowns, plus pull-behind cylinder, hydraulic valve, and breakaway coupling parts.

• Electrical equipment: Electrical Wiring and Lamp Wiring illustrations, with separate distributor, starter, generator, lamp, and tractormeter component listings.

• PTO and accessories: Power Take-Off, P.T.O. Extensions, and Belt Pulley assembly drawings, plus fenders, platforms, wheels, and associated mounting hardware.

This catalog is suited to mechanics and experienced owners who can match drawing references to parts tables and check model and serial applicability before ordering repair parts.

Engine Parts and Bearing Variations

The engine sections distinguish TO-30 assemblies from TO-20/TE-20 parts. TE-A20 listings have separate bore-size columns, along with timing-chain components rather than the TO/TE timing-gear arrangement. Crankshaft tables identify standard and undersize bearing options.

A TE-A20 crankshaft note flags a revision to oversize thrust-washer thickness and the need for matching upper and lower washers. Mixing versions can compromise crankshaft endplay and risk damage to the thrust-bearing surfaces.

Carburetor and Electrical Configurations

The TO-30 listings distinguish Carter and Marvel-Schebler TSX-458 carburetors. TO-20/TE-20 entries identify the Marvel-Schebler TSX-361A, while TE-A20 tables distinguish Zenith 1201 and 1264 assemblies.

TE-A20 carburetor applications change at engine serial S22666E. Oil-filter listings separate engines before and from SC733612E. These are engine identifiers, separate from the tractor serial numbers used elsewhere in the catalog.

Electrical Wiring sections distinguish 6-volt TE-20/TE-A20 equipment from the 12-volt TE-A20 85 mm configuration. These are pictorial wiring and component layouts linked to parts lists, rather than electrical diagnostic schematics.

Hydraulic and Drivetrain Serial Breaks

TE-A20 hydraulic pump assemblies are listed for tractors before 285933, 285933–330042, and 330043 and up. A further pump-control-valve change occurs at 407101. Matching the tractor to the applicable listing helps identify the correct pump assembly and valve components before repair parts are ordered.

Brake listings distinguish builds before and from 200001; rear axle and differential changes are identified at 325001. The TO rear axle section also lists conversion components for a TO-35 axle, without extending the catalog to general TO-35 coverage.

Parts Catalog Breakdown

Illustrations correspond to reference tables listing part numbers, descriptions, and quantities. The numerical index supports lookup by an existing part number, while replacement notes identify substitute parts and assemblies.

The TO-D20 section identifies parts specific to the fuel-oil version, including its fuel system and engine components. Other TO-D20 replacement-part lookups refer back to the TO-20 listings.

This is a parts catalog, not a step-by-step repair manual. Exploded views show component relationships; they do not provide an approved teardown sequence, troubleshooting procedures, overhaul instructions, or adjustment specifications.

Working on aging heavy machinery carries inherent risks. Use the applicable service instructions for engine, brake, and hydraulic repair, including torque values, fluid requirements, and safe workshop practices.

PDF Contents and Included Material

One printable English-language PDF contains 174 pages total, including two cover pages, 14 pages of foreword and indexes, five blank or nearly blank pages, and the two-page TO-D20 section. The duplicated front axle drawing is also included in that total.