1978 Bolens Medium Tube Frame Tractors Service Manual OEM (P/N 552875-1)
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
Model 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)
Bolens Manual Features & Content Preview
- Covers 1974–1978 Bolens Medium Tube Frame Tractors, detailing 600, 800, 1050, 1256, and 1656 series gear and hydrostatic variants
- Official 100-page OEM publication Form Number 552875-1, dated May 1978
- Features 36 detailed wiring schematics, 19 transmission assembly illustrations, and 10 maintenance intervals for engines and drivetrains
- Provides the definitive electrical and transmission reference for the medium tube frame production line, including specific G-14 and H-16 series serial-number distinctions
Documented System Coverage
Working on vintage equipment requires precise factory data, not guesswork. This service manual documents the exact technical requirements for the electrical, drivetrain, and chassis systems across 23 specific tractor models. You will find complete electrical group documentation covering magneto, solid-state, and battery ignition setups. Each configuration includes its corresponding wiring diagram to assist with accurate harness routing and troubleshooting.
The drive train sections break down both gear drive and hydrostatic transmission assemblies. They outline the factory parameters for worm gear centering, shaft installation, and hydrostatic package servicing. Before diving into these heavy drivetrain components or starting the engine, always review standard shop safety protocols to prevent accidental engagement or injury. The chassis and maintenance sections detail the exact settings for steering assemblies, clutch adjustments, and brake interlock systems across various 3-speed and 6-speed transmission platforms. Maintenance charts clearly define periodic service intervals for cooling air screens, drive belts, and transmission filters.
Specification and Reference Highlights
Having the right clearances and capacities on hand speeds up any bench rebuild. The technical specifications provide exact bore and stroke measurements for the Briggs & Stratton, Tecumseh, and Wisconsin powerplants. For example, the Tecumseh HH-100 bore and stroke is documented precisely at 3-5/16 x 2-3/4 inches within the engine tables. Fluid limits are also clearly defined. The gasoline tank capacity for all transmission models is rated at 4 quarts, while the engine oil crankcase capacity sits strictly at 2-3/4 pints.
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