1978 Bolens Medium Tube Frame Tractors Service Manual (100 Pages)
Medium Tube Frame tractor service documentation with engine specs, transmission assemblies, electrical systems, fuel and hydraulic components. Form #552875-1
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Sample pages from the 1978 Bolens Medium Tube Frame Tractors Service Manual (100 Pages) manual
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Bolens Models Covered & Key Technical Specifications
Models: 600, 650, 750, 800, 850, 853, 900, 1000, 1050, 1053, 1054, 1155, 1220, 1225, 1253, 1254, 1255, 1256, 1257, 1453, 1456, 1556, 1656
Sub-models / Variants: G-9, G-10, G-11, G-12, G-14, H-14, H-16, Gear Drive, Hydrostatic, 3-Speed, 6-Speed
Build Years: 1974–1978
Serial Numbers: 0100101–0399999
Technical Data:
- Engine displacement: 14.1 to 27.66 cubic inches depending on engine model
- Engine type: Horizontal shaft, air cooled, single-cylinder, 4-cycle
- Transmission options: 3-speed manual, 6-speed manual, Eaton hydrostatic
- Spark plug gap: 0.030 inches
- Breaker point gap: 0.020 inches
- Ground clearance: 7 inches at rear axle
- Fuel tank capacity: 4 quarts (steel), 5 quarts (plastic)
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Technical Scope for Bolens Medium Tube Frame Tractors
- Covers 1974–1978 Bolens Medium Tube Frame Tractors, including 600, 800, 1050, 1256, and 1656 series gear and hydrostatic variants
- Official OEM publication Form Number 552875-1, dated May 1978
- Contains 36 detailed wiring schematics, 19 transmission assembly illustrations, and 10 maintenance intervals for engine and drivetrain systems
- Downloads to your account within seconds of checkout
- Suitable for printing individual sections for shop-floor use
- This 1978 edition provides the definitive electrical and transmission reference for the entire medium tube frame production line, including specific G-14 and H-16 series serial-number distinctions
Documented System Coverage
The 1978 Bolens Medium Tube Frame Tractors service manual documents the technical requirements for the electrical, drivetrain, and chassis systems across twenty-three specific tractor models. Electrical group documentation spans varied ignition setups, including magneto, solid state, and battery ignition configurations, with corresponding wiring diagrams provided for each configuration. Detailed drive train sections detail gear drive and hydrostatic transmission assemblies, including specific procedures for worm gear centering, shaft installation, and hydrostatic package servicing.
The chassis and maintenance sections outline settings for steering assemblies, clutch adjustments, and brake interlock systems across various 3-speed and 6-speed transmission platforms. Maintenance charts define periodic service intervals for cooling air screens, drive belts, and transmission filters.
Specification and Reference Highlights
Technical specifications provide bore and stroke measurements for Briggs & Stratton, Tecumseh, and Wisconsin engine powerplants. The Tecumseh HH-100 bore and stroke is documented at 3-5/16 x 2-3/4 inches in the engine specification tables. Gasoline tank capacity for all transmission models is rated at 4 quarts. Engine oil crankcase capacity for models is specified at 2-3/4 pints.
This 100-page official Bolens service publication documents engine, transmission, electrical, and chassis specifications for the 1974–1978 medium tube frame tractors, providing essential identification and configuration data for restoration and maintenance work.
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