All 107 pages of this Yanmar LB446H operation manual pdf (OEM #1-9900300-00) focus on one thing: keeping your floodlight projector running safely and reliably on the job site. You get complete electrical diagrams detailing starter switch operations, a full troubleshooting guide for stubborn mast and lamp failures, and clear maintenance intervals for the engine. Open up the file to find detailed exploded views and precise generator grounding instructions that walk you through proper setup, daily operation, and long-term storage. Lock down your M8x1.25 bolts to exactly 25.5 N-m and verify your ground rod resistor reads 10 ohms or less before firing up the unit. Don't let a dead light tower halt your night shift. Grab this bookmarked download, open it on your phone, and get your site illuminated tonight.
What's Inside This Yanmar LB446H Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 5 | - |
| Safety Information | 6 | - |
| Safety | 9-10 | - |
| Basic Precautions | 11-12 | Operation and Maintenance Manual, Proper Clothing and Safety Items, Alcohol, Fuel and Oil Ignition Sources |
| Operating Precautions | 13-17 | Precautions Before Starting the Engine, Precautions Starting the Engine, Working and Parking, Precautions for Transportation, Precautions for Electric Shock, Short Circuit |
| Precautions for Servicing | 18-19 | Appropriate Tools, Unauthorized Persons, Fueling and Oiling, Lamp Handling, Battery Cable Disconnection, Waste Processing |
| Location of Warning Labels | 20-23 | Warning Labels and Location |
| Specifications | 24 | - |
| Floodlight Projector | 25 | Rated Voltage, Lamp Type, Total Luminous Flux, Mast Type, Dimensions, Mass |
| Generator | 26-28 | Generator Type, Rated Output, Engine Model, Fuel Oil, Lube Oil, Electrical Equipment |
| Floodlight Projector | 31-43 | Product Overview, Loading Generator, Replacing Lamp, Operating Each Part |
| Generator | 44-68 | Product Overview, Grounding, Installation, Operation Instructions |
| Floodlight Projector | 71-73 | Periodic Checks, Maintenance and Storage, Unclear Points or Problems |
| Generator | 74-82 | Precautions for Inspection, List of Periodic Inspections, Periodic Inspection Items |
| Troubleshooting | 83-84 | Lamp Issues, Mast Issues, Engine Issues, Electrical System Issues |
| Floodlight Projector | 85 | Lamp Does Not Light, Light Goes Out or Blinks, Lamp Only Lights for a Short Time, Mast Cannot Be Raised, Mast Keeps on Coming Down, The Mast Cannot Be Lowered |
| Generator | 86-88 | Engine Does Not Start, Turning on Starter Motor Does Not Start Engine, Engine Stops, Engine Speed Stays Low, Engine Speed Is Abnormal, Engine Stops While Running |
| Electrical Diagram | 89-92 | Color Coding, Starter Switch Operation Diagram, Diode, Safety Relay, Regulator, Solenoid |
| Ordering Replacement Parts and Service Call | 93-96 | Model Designation, Machine Serial Number, Hourmeter Reading, Nameplate, Serial Number Plate |
| Notes and Maintenance Log | 97-105 | Maintenance Log |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Tightening torque for M6×1.0 bolts | 10.8±1.0 N·m (1.1±0.1 kgf·m) | p. 75 |
| Tightening torque for M8×1.25 bolts | 25.5±2.9 N·m (2.6±0.3 kgf·m) | p. 75 |
| Lamp type | Metal Halide Lamp Type S M400 SC/BU | p. 25 |
| Lamp part number | 1-3010006-10 | p. 35 |
| Ground rod resistor | 10 Ω or less | p. 41 |
| Rated voltage | 130 V | p. 25 |
| Rated output | 1.7 kVA | p. 25 |
| Lamp cool-down time before restarting | 20 minutes | p. 42 |
| Maximum ambient temperature for operation | 40°C | p. 85 |
| Floodlight Projector Rated Voltage | 130 V | p. 25 |
| Floodlight Projector Total Luminous Flux | 160000 lm | p. 25 |
| Floodlight Projector Mass | 246 kg | p. 25 |
Yanmar LB446H Common Problems This Manual Covers
Yanmar LB446H floodlight projector will not turn on and the metal halide lamp remains completely dark p. 85
Verify the generator voltage output reaches the rated 130 V specified on page 25. Check coupler connections and inspect for lamp looseness. If the bulb is burned out, install replacement lamp part number 1-3010006-10 as detailed on page 35. Wait for the initial pulse before retesting.
Manual Section: Floodlight Projector - Lamp does not lightMast lamp shuts down unexpectedly during operation or blinks continuously after reaching operating temperature p. 85
Check the troubleshooting steps on page 85 for blinking lights. Allow the lamp a mandatory cool-down time of 20 minutes before restarting, as noted on page 42. Verify the ambient operating temperature remains below the 40°C maximum limit and inspect the air cleaner element for blockages.
Manual Section: Floodlight Projector - Light goes out or blinksGenerator engine starter motor turns over slowly or does not crank at all in cold weather p. 86
Inspect the battery terminal connections and test the ground cable resistance to ensure it measures 10 Ω or less as shown on page 41. Verify the DC circuit fuse on page 48 is intact and matches the required 20A rating. Clean all connections and test the starter switch.
Manual Section: Generator - Engine does not start (starter motor issues)Projector mast assembly gets stuck during extension and cannot be raised or lowered safely p. 85
Examine the mast sliding surface, winch brake disk, and wire rope for binding. Inspect the safety stopper and ensure all M10x1.5 mounting bolts are torqued to exactly 49.0±4.9 N·m according to the maintenance schedule on page 75. Lubricate the dram shaft if the winch latch sticks.
Manual Section: Floodlight Projector - Mast operation issuesFrequently Asked Questions
What does the warning light or error code mean on a YANMAR floodlight projector?
The YANMAR floodlight projector features an Oil Alert Lamp. If this lamp lights up during operation, it indicates that the lube oil pressure has fallen, and the engine will automatically stop for protection. Before starting, the lamp lights when the starter switch is turned to "ON" and goes off when lube oil pressure rises. If the lamp lights and the engine stops, immediately check the oil level and for any oil leaks.
How do I troubleshoot a YANMAR floodlight projector that won’t start?
If the engine does not start, common causes include a discharged battery (check electrolyte level and specific gravity), loose or corroded battery terminals (clean and tighten), or a defective dynamo (repair or replace). A blown 20A fuse can also prevent starting, requiring removal of the control panel to replace it. Other issues could be insufficient fuel, air mixed in fuel, a clogged fuel filter, or the fuel cock being closed. For a comprehensive list of issues and measures, refer to the troubleshooting table in Section 15, page 86.
What are the torque specs for YANMAR service bolts?
For bolts with a "7" on their head (Strength classification: 7T), specific tightening torques are provided. For example, M6×1.0 bolts should be tightened to 10.8±1.0 N·m (1.1±0.1 kgf·m), M8×1.25 bolts to 25.5±2.9 N·m (2.6±0.3 kgf·m), and M10×1.5 bolts to 49.0±4.9 N·m (5.0±0.5 kgf·m). For bolts not listed, apply 60% of the specified tightening torque, and for bolts tightened to aluminum, apply 80%.
What are the replacement specifications for bulb / LED module?
The YANMAR floodlight projector uses Metal Halide Lamps. The specific type is S M400 SC/BU, and four lamps are required. For replacement, a YANMAR genuine lamp with Parts No. 1-3010006-10 should be used to ensure proper lighting and performance. The manual does not mention LED modules.
How will I receive this Yanmar Operation Manual?
Immediate download of the complete 107-page searchable Operation Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Can I print specific sections of this Yanmar Operation Manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Are electrical wiring diagrams included in this Yanmar Operation Manual?
Yes, this Yanmar Operation Manual includes a wiring diagram for the electrical system.
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