This document is an owner's manual for a Firman Diesel Generator, identified by part number D0128008. The manual outlines the safe and proper operation, as well as essential maintenance procedures, for the generator set.

Function Description:

The Firman Diesel Generator is designed to produce electric power using a diesel engine. It serves as a portable power source for various electric appliances. The generator features both AC and DC output capabilities, with specific voltage and amperage ratings for each. It is equipped with an engine speed lever to control operation and a fuel tank for diesel light oil. The generator also includes safety features such as an AC breaker and a DC breaker to protect against overcurrent. Starting the generator can be done via two methods: recoil starting or electric starting, providing flexibility depending on user preference or conditions. The engine is an air-cooled, 4-cycle diesel engine, designed for reliable performance.

Usage Features:

Before operation, users are instructed to place the generator on a flat, horizontal surface. The manual emphasizes the importance of checking the engine oil level and ensuring it is within the recommended range, as insufficient or excessive oil can damage the engine. Proper fuel selection is critical, with a strict recommendation to use only diesel light oil with a cetane value of more than 45 to prevent starting difficulties, misfiring, and white exhaust smoke. Refueling must be done in a well-ventilated area with the engine stopped, and users are warned against overfilling the tank.

For recoil starting, the fuel cock must be in the "Open" position, and the engine speed lever set to "RUN." The recoil starting handle is pulled with a specific technique, including pushing down the decompression lever. In cold weather, adding a small amount of engine lube oil to the cylinder head bonnet is suggested for easier starting. For electric starting, the fuel cock is opened, the engine speed lever is set to "RUN," and the starting key is turned clockwise to "START." Users are advised to release the key as soon as the engine starts and to wait briefly between starting attempts to avoid draining the battery.

During operation, the generator should be warmed up without load for approximately 3 minutes. The manual highlights that CX series generators are equipped with a low oil warning system, which will automatically stop the engine if oil pressure is low or lubrication oil is scarce. Users are cautioned against loosening or readjusting the engine speed limiting bolt or fuel injection limiting bolt, as these are factory-adjusted settings that affect performance. When connecting appliances, the AC breaker should be set to "ON," and the generator must reach its rated speed. For DC applications, correct polarity must be observed. The manual also advises against connecting instruments that require excessive starting current or exceed the rated current of the socket to prevent damage to the machine.

Stopping the generator involves several steps: setting the AC breaker to "OFF," unplugging appliances, moving the engine speed lever to low speed for 3 minutes without load, then to "STOP." For electric-start models, the starter key is returned to "OFF," and the fuel chock lever is set to "S" (closed). Finally, the recoil handle is slowly pulled to the point of compression to prevent rust formation. Users are warned against stopping the engine suddenly or using the decompression lever for stopping, as this can lead to abnormal temperature rises.

Maintenance Features:

The manual provides a detailed maintenance schedule, categorizing checks and maintenance tasks by daily, first month (or 20 hours), every 3 months (or 100 hours), every 6 months (or 300 hours), and every year (or 1000 hours). Key maintenance tasks include checking and tightening bolts and nuts, checking and resupplying engine oil, and replacing engine oil. The oil filter needs to be cleaned every 3 months or 100 hours. The air cleaner element, which is a wet type, should be changed every 6 months or 300 hours (or earlier if dirty), and users are warned not to wash it with detergent or run the engine without it.

The fuel filter requires cleaning every 3 months or 100 hours and replacement every 6 months or 300 hours to ensure maximum engine output. Tasks such as checking the fuel injection nozzle, fuel injection pump, and fuel piping, as well as adjusting intake/exhaust valves head clearance and checking/lapping intake/exhaust valve seats, are marked as requiring special tools and skills, indicating that a dealer should be contacted for these services. Replacing piston rings also falls under this category. Battery liquid levels should be checked monthly, and distilled water added if the level drops below the lower mark.

For long-term storage, specific preparations are outlined to prevent damage and rust. This includes operating the engine for 3 minutes before stopping, draining the used engine oil while warm, and refilling with new oil. A small amount of engine lube oil should be added to the cylinder head bonnet for 2500 and 4000 series models. The engine should then be turned over a few times without starting, either by pulling the recoil starter with the decompression lever down or by turning the starter key for electric-start models. Finally, the decompression lever is pulled up, and the recoil starter is slowly pulled until resistance is felt, closing the intake and exhaust valves to prevent rust. The generator should then be cleaned and stored in a dry place.

Firman SDG5500CLE - Name of Parts; Generator Component Identification

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