A boom that drifts under load on your Manitou MLT 634 120 ST3B is the kind of job this 449-page repair manual (OEM ID 647412EN) was written for, and it covers 14 ST3B telehandler variants across the MLT and MT ranges. Electricity is the biggest chapter, at more than a third of the book, with wiring schematics that trace harness routing and fault code tables that explain each stored error. Hydraulic schematics map the boom and attachment circuits, and the transmission chapter includes its own troubleshooting section. Torque the axle fasteners to 340 N.m ± 10%, and the engine oil pressure relief valve should open at 9 bar. A made-up figure on a loaded axle can cost you a wheel. Bookmarks take you from the cover to the brake or boom chapter in two clicks, and the text layer finds any spec by name.
What's Inside This Repair Manual
| System | Pages | Key Topics |
|---|
| General Instructions and Safety Notice | 4-25 | Preamble, Maintenance Position, Rules for Maintenance |
| Engine | 26-79 | Engine Characteristics and Specifications, Engine Circuits Flow Diagram, Engine Components Location, Engine Control and Adjustment, Engine Removal, Engine Refit |
| Transmission | 80-115 | Transmission Schematic Diagrams, Transmission Components Location, Transmission Control and Adjustment, Transmission Removal, Transmission Troubleshooting |
| Axle Assembly - Axle | 116-119 | Axle Control and Adjustment |
| Brake | 120-137 | Brake Characteristics and Specifications, Brake Components Location, Brake Control and Adjustment, Brake Removal |
| Telescopic Boom | 138-159 | Boom Characteristics and Specifications, Boom Components Location, Boom Control and Adjustment, Boom Removal |
| Hydraulic | 160-239 | Hydraulic Characteristics and Specifications, Hydraulic Schematic Diagrams, Hydraulic Components Location, Hydraulic Control and Adjustment, Hydraulic Components Removal |
| Electricity | 240-411 | Electrical Characteristics and Specifications, Electrical Schematic Diagrams, Electrical Components Location, Electrical Control and Adjustment, Electrical Components Removal |
| Options - Accessories | 412-449 | Machine Option Configuration, Forced Operation Option, Crc Option Telescope Suspension, E.C.S. Option Easy Connecting System, Manual Accelerator Option, Air-Conditioning Option |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| Engine support bracket bolt torque | 70 N.m ± 10% | p. 68 |
| Axle tightening torque | 340 N.m ± 10% | p. 119 |
| Pressure relief valve opening pressure | 9 bar | p. 32 |
| Maximum oil temperature in the sump | 125°C | p. 32 |
| Maximum cooling system pressure | 1.2 bar | p. 33 |
| Maximum temperature difference across the radiator | 8°C | p. 33 |
| Main L.P. pressure | 15 bar | p. 94 |
| Converter L.P. pressure | 6 bar | p. 94 |
| Slide pad tightening torque C1 | 15 N.m ±15% | p. 147 |
| Slide pad tightening torque C2 | 92 N.m ±15% | p. 147 |
| Fuel tank capacity | 120 L | p. 19 |
| Engine oil capacity | 10 L | p. 19 |
