All 107 pages of this Bolens Large Frame service manual PDF (OEM #552665-5) focus on one thing: putting your Large Frame tractor back to work in the yard. Inside: wiring diagrams for every model in the series, from the 1886s light and charging circuits to the 2388s preheat circuit, plus full hydrostatic teardown procedures for both Sundstrand and Eaton transmissions. You also get troubleshooting guides for the electrical, drive train, fuel, and hydraulic systems, torque and lubrication charts, and service coverage for mower, snow thrower, and tiller attachments. Battery should read 11.5 to 12.5 volts; each 0.012-inch shim raises relief pressure 50 psi. These tractors outlived their dealers, and the factory numbers live here. Bookmarked and keyword-searchable; download it, prop your phone on the fender, and get wrenching.
What's Inside This Bolens Large Frame Series Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1-12 | Serial Number Information, Specifications, Torque Maintenance Chart, Kohler Maintenance Chart, Wisconsin/Ducatti Maintenance Chart, Lubrication Points, Lubrication Chart |
| Electrical System | 13-32 | Trouble Shooting Guide (Wiring Diagram 1886s-05 and 06, Light Circuit Diagram, Start/Run Circuit, Charging Circuit, Wiring Diagram 2086 and 2087 S/N 01/03, Wiring Diagram 2087-04 and 2389, Light Circuit, Start/Run Circuit 2086 and 2087-01/03, Start/Run Circuit 2389, 2087-04 and 2389s, Cruise Control Circuit, Wiring Diagram 2389s, Wiring Diagram 2288 and 2289, Seat Circuit, Start Circuit, Wiring Diagram 2388s, Run Circuit, Preheat Circuit, Testing Electrical System) |
| Drive Train | 33-69 | Trouble Shooting Guide, Principles of Hydrostatic Operation, Hydrostatic Transmission Flow Chart, Identification, Testing Hydro, Hydro Removal and Installation |
| Fuel System | 70-74 | Trouble Shooting Guide, Fuel Tank and Valve, Fuel Filter, Air Cleaner, Carburetor Adjustments |
| Chassis | 75-81 | Front Axle, Front Wheel Alignment, Turning Radius, Front Wheel Bearings, Tires, Brakes, Power Take-Off Lever and Belts, Rear Wheels |
| Hydraulic System | 82-94 | Trouble Shooting Guide, Principle of Operation, Testing Hydraulic System, Checking Implement Relief Valve, Hydraulic Power Lift, Repairing Hydraulic System (Disassembly, Assembly) |
| Engine | 95-100 | Trouble Shooting Guide, Engine Removal |
| Tractor Attachments | 101-107 | Mowers, Snow Thrower, Tillers |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 2388s | ||
| Battery | 90 Amp | p. 6 |
| All Models | ||
| Battery voltage | 11.5 to 12.5 volts | p. 31 |
| Battery cranking test voltage | 9.0 volts | p. 31 |
| Pressure increase per 0.012 in shim | 50 psi | p. 36 |
| Seat interlock switch activation clearance | 5/8 in. (1.6 cm) | p. 81 |
| Pressure increase per 0.012 in. shim | 50 psi | p. 84 |
| 1886s, 2086, 2087, 2389, 2389s | ||
| Dry type element replacement interval (dirty conditions) | 100 hours | p. 73 |
| Dry type element replacement interval (good clean air conditions) | 200 hours | p. 73 |
| 1886s-05 & 06 | ||
| Engine Oil Capacity (1886s-05 & 06) | 3 Quarts and 1 pint in filter | p. 5 |
| 2086 | ||
| Engine Oil Capacity (2086) | 3 Quarts and 1 pint in filter | p. 5 |
| 2087 | ||
| Engine Oil Capacity (2087) | 3 Quarts and 1 pint in filter | p. 5 |
| 2288 | ||
| Engine Oil Capacity (2288) | 2.2 Quarts and 1 pint in filter | p. 5 |
Bolens Large Frame Series Common Problems This Manual Covers
Bolens large frame tractor starter will not energize, key turns but nothing happens at the solenoid
Check that the PTO is disengaged and the brake pedal is locked down before condemning parts. Test the battery: a healthy one reads 11.5 to 12.5 volts, per the spec on page 31. Verify the seat interlock switch actuates within its 5/8 in. (1.6 cm) clearance, then clean and tighten both battery cable connections.
Manual Section: Electrical System p. 13Engine cranks slowly and struggles to start after the tractor sits all winter in the barn
Load-test the battery first: cranking voltage should not drop below 9.0 volts with the battery near 80°F (26°C), per the test on page 31. Clean both terminals and cable ends to bare metal. With the engine running, check for 13.8 volts at the B terminal as shown on page 32; less means charging trouble.
Manual Section: Electrical System p. 13Engine starts but runs rough, surges at idle, and stalls when the deck engages
Drain stale fuel from the tank and replace the inline fuel filter before touching the carburetor. Work the rough-running chart on page 70 through the carburetor adjustment steps. Check the air cleaner too; on 1886s, 2086, 2087 and 2389 series machines the dry element is done at 100 hours in dusty conditions.
Manual Section: Fuel System p. 70Hydraulic lift will not raise the mower deck, lever moves but nothing happens
Check the transmission oil level first; a low reservoir kills charge pressure before anything else fails. Run the hydraulic test procedure starting on page 82 and check the implement relief valve. If relief pressure tests weak, shim the spring: each 0.012 in. shim raises pressure about 50 psi, noted on page 84.
Manual Section: Hydraulic System p. 82Hydrostatic drive feels weak, tractor slows down or quits pulling on hills
Verify the transmission oil level and top up before condemning the hydro. Work through the loss-of-power chart on page 33, then run the charge pressure test in the Testing Hydro procedure. If the unit gets opened up, torque the pump, center and motor housing capscrews to 35 ft. lbs. on reassembly.
Manual Section: Drive Train p. 33Frequently Asked Questions
How do I troubleshoot a no-crank condition on a Bolens 2087?
For a no-crank condition, first check if the P.T.O. is engaged, the brake pedal is not depressed, or if there are corroded/loose electrical connections. Also, verify the battery charge, check for defective safety switches (P.T.O. interlock, brake interlock, ignition switch), or a defective solenoid. Refer to the Electrical System Trouble Shooting Guide on page 13 for the complete list of causes and remedies. p. 13
What are the replacement specifications for the battery on a Bolens 2388S?
The Bolens 2388S model is equipped with a 90 Amp battery. When testing, ensure the battery voltage is between 11.5 and 12.5 volts, and it should not drop below 9.0 volts during a 15-second cranking test. p. 6
What is the correct engine oil capacity for a Bolens 2086 tractor?
The engine oil capacity for the Bolens 2086 is 3 quarts (2.8 liters) plus 1 pint (0.47 liters) for the oil filter. Use the specified oil type based on the average temperature as outlined in the lubrication chart. p. 5
What is the torque specification for the transaxle wheel hub nut?
The wheel hub nut on the transaxle must be torqued to 150 ft. lbs. (203 Nm). p. 6
How do I adjust the implement relief valve pressure on a Sundstrand hydrostatic transmission?
The implement relief valve pressure should be 550 to 800 P.S.I. If the pressure is low, shims are available to increase it. One shim, 0.012 inches in thickness, will increase the pressure by approximately 50 psi. p. 38
Do I get instant access to this Bolens 1886s-05 Service Manual?
This is a 107-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Can I print just the pages I need from this Bolens 1886s-05 manual?
Zero restrictions. The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
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