1985 Bolens 1886s-05, 1886s-06, 2086, 2087, 2288, 2289, 2388s, 2389, 2389s Large Frame Tractor Service Manual (P/N 552665-5)

This Bolens Large Frame Tractors Service Manual, Form 552665-5, Rev. 3/85, covers the 1985 HT 18, HT 20, HT 22, HT 23 and HDT 1000 models listed above, with gasoline and diesel configurations.

• Electrical diagnosis: Model- and serial-specific wiring diagrams, light and start/run circuits, charging-system troubleshooting, interlock testing, cruise-control circuits and diesel preheat wiring.

• Hydrostatic service: Sundstrand charge-pump, pump, center-section and motor repair; Eaton pressure testing, removal, installation and control-shaft seal replacement.

• Transaxle repair: Carrier and axle assembly, two-speed range mechanisms, bearing and seal replacement, gear backlash, end-play checks and shim selection.

• Hydraulics and steering: Implement-relief diagnosis, lift-cylinder and control-valve repair, power-steering adjustment and cylinder service, plus oil-cooler plumbing.

• Engine and chassis service: Fuel and air-cleaner maintenance, carburetor adjustment, engine removal, front-wheel alignment, disc brakes and P.T.O. belt adjustments.

• Tractor attachments: Rotary-mower gearbox and spindle repair, snow-thrower chain and auger service, and garden-tiller gearbox disassembly and reassembly.

The repair sections suit technicians and mechanically experienced owners familiar with pullers, bearing drivers and pressure gauges; selected engine services are assigned to authorized engine dealers.

Electrical Fault Tracing and Serial Breaks

Separate start/run diagrams distinguish the earlier 2086/2087 circuits from the later 2087 and HT 23 arrangements. Those differences help you select the right interlock circuit before tracing a no-start condition.

The charging-system test chart separates stator, rectifier-regulator and battery faults. HDT 1000 coverage adds glow-plug preheat and cruise-control wiring.

Sundstrand, Eaton and Transaxle Repair

The Hydrostatic Transmission Flow Chart explains both designs. Sundstrand inspection drawings distinguish ball-bearing charge pumps with unhardened input shafts from needle-bearing versions with hardened shafts, helping match replacement components.

Eaton repair limits: The Model 11 breakdown accompanies pressure checks, removal/installation and external seal work. Full internal overhaul requires the separate Eaton repair manual. The control-arm warning identifies the risk of internal damage from prying or hammering the arm off.

Transaxle section views show where thrust bearings, washers and shims belong. Separate assembly instructions cover the planetary two-speed mechanism and the earlier transaxles.

Lift Hydraulics and Power Steering

Control-valve repair distinguishes Cessna and AICO versions with different seal kits. The instructions keep each spool matched to its bore and specify complete valve replacement when a spool or the body is damaged.

Power-steering valve-and-cylinder exploded views support cylinder repair and adjustment. Coverage identifies steering kits 18088, 18112 and 18114; flow diagrams show oil routing with and without the cooler.

Observe the manual's precautions around hydraulic pressure, supported assemblies and rotating drive components.

Engine, Fuel and Attachment Coverage

Maintenance and lubrication charts separate Kohler, Teledyne Wisconsin/Ducati and Mitsubishi requirements. The Mitsubishi chart specifies valve-clearance checks every 50 hours.

Engine scope: The Kohler section covers routine service and engine removal; the 2288/2289 section details removal and reinstallation. This is not a full internal engine overhaul manual.

Fuel coverage includes model-specific filters, carburetor adjustment and diesel fuel-line air purging. Chassis instructions add turning-radius settings and distinguish the P.T.O. brake arrangements across the 2389 serial break.

Attachment procedures cover mower gearboxes for models 18049/18110 and the model 18103 snow thrower, with exploded views. Tiller instructions address input-shaft end play and gear backlash.

A Sample of Drivetrain and Cooling Specifications

These are a few of the component-level specifications included in the manual.

For the 1886s/2086/2087 transaxles, the assembly section identifies a 55-tooth cluster gear paired with a 15-tooth pinion. Axle-housing capscrews are specified at 30 ft-lb (40 Nm).

The transaxle installation procedure lists approximately 10 qt (9.5 L) of hydraulic fluid. The Mitsubishi-powered 2388s has a radiator capacity of 7 qt (6.6 L).

PDF Access and Page Breakdown

Search and diagram viewing: PDF text search is unavailable. Two embedded bookmarks lead to the introductory page and manual cover, without chapter navigation. Small wire-color codes and switch-terminal labels are readable when enlarged; some full wiring diagrams are printed sideways.

The download is one printable English-language, 108-page PDF: 107 pages of the Bolens publication, including its cover, model list, contents and seven-page Tractor Attachments addendum, plus one additional introductory page. All are included in the total.