Part of the Yanmar Repair Manuals.
Pull the access panel on a Yanmar LB446HB that cranks fine but leaves the lamps dark, and you are looking at three systems that all have to cooperate: the floodlight projector, the 1.7 kVA generator, and the L48AD EGYSS6H diesel that drives it. This service manual walks all three end to end, from specifications and service standards through disassembly, checking and servicing, troubleshooting, and test run.
The engine chapters read like a rebuild bench sheet: wear limits for the piston, connecting rod, crankshaft and main bearing, tightening torque tables, and adjustment procedures for valve clearance and fuel injection. Guessing a head nut torque on a small diesel is how castings crack and gaskets weep; the factory figures are here instead.
It is a 275 page PDF with 227 bookmarks, so it rides on the phone in your pocket or the laptop at the bench, wherever the LB446H is parked.
Complete the set for your LB446HB, LB446H, LB446HB/H
- Operator Manual: Yanmar LB446H, LFRLB446H0 Light Tower Operator Manual
- Repair Manual: Yanmar LB446H Operation Manual (incl. Wiring)
What's Inside This Yanmar LB446HB, LB446H, LB446HB/H Manual
| System | Pages | Key Topics |
|---|---|---|
| Floodlight Projector | 2-81 | Cover, Foreword, Contents, Back Cover |
| Generator | 82-146 | Cover, Introduction, Contents, For Safe Operation (Warning Symbols, Safety Precautions, Location of Warning Labels) |
| Cover | 147-148 | Introduction |
| Service Information | 149-151 | General Safety, Serial Number Location, Service Rules |
| Specifications | 152-158 | Cross Sectional Views |
| Service Standard | 159-168 | Intake/Exhaust Valve Seats, Valve Spring, Piston, Connecting Rod, Crankshaft and Main Bearing, Oil Pump (Trochoid Pump) |
| Disassembly and Reassembly | 169-187 | Tools, Meters and Instruments, Tightening Torque, Maintenace Schedule, Disassembly Procedures |
| Checking and Servicing | 188-245 | Cylinder Head, Piston and Piston Pin, Connecting Rod, Crankshaft, Flywheel and Main Bearing |
| Troubleshooting | 246-261 | No Fuel Injection Sound, Low Compression Pressure, Failure of Starter Motor, Insufficiently Charged Battery, Unexpected Reverse Rotation at Startup, Abnormal Exhaust Color |
| Test Run | 262-264 | Before Starting, Starting, Operation, Stopping |
| Helical Inserting Part for Repair | 265-267 | Size of Helical Inserting Part, Drilling, Tapping, Insertion, Where Helical Insert Part CAN Not Be Used |
| Appendix 1 Difference Between Parts Under Spec. S and D | 268-270 | Crank Case Cover, Camshaft Assy, Flywheel, Piston, Cooling Fan Case, Starting Motor |
| Appendix 2 Detail of Special Tools | 271-273 | Oil Seal Fitting Tool, Valve Stem Seal Fitting Tool, Flywheel Tightening Handle, Flywheel Extractor |
| Colophon | 274 | First Edition, Engineering & Development Dept., Construction Equipment Division, Products Support Group, Yanmar Technical Service Co., Ltd. |
| Spine Title | 275 | Yanmar, Service Manual, Model, LB446HB/H |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| LB446H | ||
| Lighting unit assembly nut (M16) tightening torque | 49 to 66 lbw-ft (67 to 90 N-m) | p. 33 |
| All Models | ||
| Lamp replacement part number | 1-3010010-10 | p. 48 |
| Floodlight Projector Rated Voltage | 130 V | p. 14 |
| Floodlight Projector Current | 3.3 x 4 A | p. 14 |
| Floodlight Projector Lamp Rated Life | 20000 h | p. 14 |
| Generator Rated Output | 1.7 kVA | p. 98 |
| Generator Fuel Tank Capacity | 15 L | p. 98 |
| Generator Lube Oil Capacity (Upper Limit) | 0.8 L | p. 98 |
| Intake/Exhaust Valve Head Clearance | 0.15±0.05 mm | p. 126 |
| Fuel Injection Pressure | 19.6 MPa | p. 127 |
| Floodlight Projector Mast Group Bolt Torque (M10X25) | 24 to 33 N-m | p. 38 |
| LB446HB | ||
| Coupler button screw (M10X35) tightening torque (for balloon type) | 24 to 33 lbw-ft (33 to 45 N-m) | p. 31 |
