1985 Bolens 1886s-05, 2086, 2087, 2288, 2289, 2388s, 2389, 2389s Service Manual (P/N 552665-5)

The official 107-page OEM publication (Form 552665-5, Revision 3/85) is the authoritative factory reference for maintaining 1985 Bolens Large Frame tractors.

• Covers 1886s, 2086, 2087, 2288, 2289, 2389, and 2388s models, including gas and diesel powertrain variants.
• Features 38 exploded-view diagrams, 16 wiring schematics, and 3 comprehensive torque specification tables.
• Documents engine, chassis, electrical, and hydraulic system specifications.

Mechanical and Electrical Systems Overview

When you have a Bolens Large Frame on the lift, you need exact routing and diagnostic data. This manual maps out the core systems. It starts with extensive electrical diagrams for various lighting, charging, and start-run circuits. These are broken down by the specific serial number changes found across the lineup, saving you time when tracing a dead short. Working on vintage heavy equipment presents serious hazards, especially regarding pressurized hydraulic lines and heavy rotating components. Reviewing factory-approved diagnostic sequences reduces the risk of injury or parts damage before turning a wrench.

The documentation moves into the hydrostatic transmission, detailing the operating principles for both Sundstrand and Eaton units. It covers the factory-recommended procedures for removal, installation, and internal disassembly of individual pumps, motors, and center sections. Further sections map out the fuel system, noting carburetor adjustment parameters, fuel filter maintenance, and air cleaner service. You will also find chassis coverage detailing front axle alignment, turning radius settings, disc brake adjustments, and P.T.O. belt tensioning. The hydraulic section rounds this out with testing parameters, control valve breakdowns, and oil cooler routing for heavy-duty applications.

Specification and Reference Data

Guesswork doesn't cut it during a rebuild. This reference delivers the exact clearances, fluid capacities, and torque settings required to return these classic agricultural units to original equipment standards. The transmission oil capacity for the hydrostatic unit is clearly documented at 10 quarts (9.5 L). It notes that valve clearance checks for Mitsubishi diesel engines are required every 50 hours of operation. When bolting the drivetrain back together, the main transaxle assembly bolts demand exactly 30 ft. lbs. (40 Nm) of torque. You also get specific gear data, like the 55-tooth cluster and 15-tooth pinion configuration used for the transaxle, alongside the 7-quart (6.6 L) radiator capacity for the Mitsubishi-powered 2388s.