Sometime this afternoon you will have a 6-speed transmission split on the bench, and this 100-page Bolens 600 through 1656 service and repair manual PDF (OEM 552875-1) belongs open beside it, covering 26 Medium Tube Frame Tractors. Wiring diagrams fill most of the electrical chapter, drawn model by model for magneto, battery and solid state ignition, then followed by Delco-Remy generator checks and a full system test. Drive train pages work through 3-speed and 6-speed gear diagrams, hydrostatic package removal and Model 10 hydro repair, while the chassis chapter handles clutches, disc brakes, interlock switches and the PTO shaft seal. Fill the engine with 2-3/4 pints of oil and set carburetor idle at 1200 RPM. One misread gear stack means a second teardown and a swap-meet hunt for a part nobody makes anymore. Bookmarks and a text layer jump you to the right chapter, so the tractor is back in the field before the weather turns.
What's Inside This Manual
| System | Pages | Key Topics |
|---|
| General | 3-13 | Serial Number Information, Specifications, Maintenance Chart, Lubrication Points, Lubrication Chart Gear Drive, Lubrication Chart Hydrostatic Drive |
| Electrical System | 14-37 | Trouble Shooting Guide (Wiring Diagram 600, 800, 900 & 1000 Magneto Ignition) |
| Drive Train | 38-68 | Trouble Shooting Guide (Bearing Installation Tools, Oil Seal Tools, Worm Centering Kit No. 171-9432) |
| Fuel System | 69-74 | Trouble Shooting Guide (Fuel Tank and Valve, Fuel Filter, Air Cleaner, Carburetor Adjustments) |
| Chassis | 75-90 | Steering Assembly (Clutch Assembly 6-Speed Transmission, Clutch Assembly 3-Speed Transmission, Clutch Assembly 3-Speed Transmission Older Models) |
| Hydraulic System | 91-96 | Trouble Shooting Guide (Principle of Operation, Hydraulic Power Lift, Hydraulic Lift Kit, Transmission Filters) |
| Engine | 97-99 | Trouble Shooting Guide, Engine Removal |
| Service Letters/Bulletins | 100 | Service Letters, Bulletins |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| All Models |
| Idle Speed Adjustment | 1200 RPM | p. 71 |
| Idle Speed Adjusting Screw | 1750 RPM | p. 71 |
| Engine Oil Capacity | 2-3/4 pints | p. 4 |
| Gasoline Capacity | 4 quarts | p. 4 |
| Ground Clearance - Rear Axle | 7 inches | p. 7 |
| Hydrostatic Transaxle Bolt Torque | 240 inch pounds | p. 64 |
| Hydrostatic Transaxle Cover Bolt Torque | 35 foot pounds | p. 68 |
| HH-100, HH-120-120090 C, HH-120-12099E, HH-140, HH-150 & HH-160 |
| Engine Oil Capacity | 3 pints | p. 5 |
| HH-120 - 120061 B |
| Engine Oil Capacity | 2 pints | p. 5 |
