1985 Bolens 1886s-05 / 2086 / 2087 / 2288 / 2289 / 2388s / 2389 / 2389s Service Manual

Bolens Large Frame Tractor Service Manual

• Covers 1985 Bolens 1886s, 2086, 2087, 2288, 2289, 2389, and 2388s tractors, including gas and diesel powertrain variants.
• Official OEM publication Form 552665-5, Revision 3/85.
• Contains 38 exploded-view diagrams, 16 wiring schematics, and 3 comprehensive torque specification tables.
• Accessible from your device as soon as the order is placed.
• Laid out for standard letter and A4 printing.
• This 107-page document serves as the authoritative factory reference for maintaining the Large Frame series drivetrain, hydraulic lift, and charging systems.

Mechanical and Electrical Scope

This 1985 Bolens 1886s–2389 technical publication provides detailed documentation on all core tractor systems. The content begins with extensive electrical diagrams for various lighting, charging, and start-run circuits, specifically tailored for the different serial number breaks found across the Large Frame lineup. Following these electrical schematics, the text transitions to the hydrostatic transmission, covering operating principles for both Sundstrand and Eaton units, removal and installation procedures, and internal disassembly for individual pump, motor, and center section components.

Additional sections address the fuel system with carburetor adjustment parameters, fuel filter maintenance, and air cleaner service. The chassis coverage details front axle alignment, turning radius settings, disc brake adjustments, and power take-off (P.T.O.) belt tensioning. Rounding out the manual is the hydraulic system section, which includes testing procedures, control valve repair, and oil cooler installation for heavy-duty applications.

Specification and Reference Data

Technical depth remains consistent throughout, providing precise clearances, capacities, and torque settings required for accurate maintenance. Transmission oil capacity for the hydrostatic unit is documented at 10 quarts (9.5 L). Valve clearance checks for Mitsubishi diesel engines are required every 50 hours of operation. The main transaxle assembly bolts require 30 ft. lbs. (40 Nm) of torque for proper securement. A 55-tooth cluster gear and a 15-tooth pinion gear are used for the Large Frame transaxle gear ratio. The cooling system for the Mitsubishi-powered 2388s requires a 7-quart (6.6 L) radiator capacity. Understanding factory workshop documentation ensures that all service adjustments adhere to original equipment standards for these classic agricultural units.

Note: This page is a contents overview for the manual. It does not provide repair or diagnostic instructions. An official 107-page Bolens OEM service manual covering the 1985 Large Frame series, documenting engine, chassis, electrical, and hydraulic specifications for the 1886s through 2389s builds.