The Hino FD2220 uses an H4651 bulb size for high beam headlights and an H4656 bulb size for low beam headlights. The replacement chart covers vehicle production years spanning 1998 to 2002 with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Hino FD2220 uses the H4651 bulb size for the high beam headlight across the 1998-2002 model years.
The low beam headlight on the FD2220 uses the H4656 across the same 1998-2002 span.
Both the H4651 and H4656 are sealed beam units built to the ANSI standard recognized in the United States and Canada. In a sealed beam design, the lens, reflector, and filament are fused into a single glass unit, meaning the entire assembly is replaced rather than an internal bulb.
Both units share the 4x6-inch rectangular form factor, a standardized size that allows sealed beams of the same designation to be sourced from multiple manufacturers without altering the housing.
The H4651 and H4656 are both rated at 12 volts, consistent with the standard electrical system voltage found in most commercial vehicles of this type.
Although the H4651 and H4656 share the same physical 4x6-inch rectangular sealed beam housing, they are not interchangeable. The H4651 is designated for high beam use and the H4656 for low beam use, and each contains a filament configuration specific to its function.