The Hino FF3020 high beam headlight uses an H4651 bulb size while low beam headlight applications require either H4656 or H4652 bulb sizes. The replacement chart covers vehicle production years spanning 1993 to 2004 with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H4651, H4656, and H4652 are all ANSI-standardized sealed beam units used across the Hino FF3020 headlight system. Each operates at 12V and follows the 4x6-inch rectangular sealed beam format established under North American (US and Canada) standards.
Sealed beam units of this type do not contain a replaceable bulb element. When a unit fails, the entire assembly is replaced rather than an internal filament or capsule.
The Hino FF3020 uses the H4651 for the high beam headlight position across all listed model years from 1993 to 2004, making it the most consistently specified bulb type in these specifications.
The H4656 fills the low beam headlight position for the FF3020 across most listed years, including 1993-1995 (excluding 1995), 1998-2002, and 2004. It shares the same 4x6-inch rectangular sealed beam construction and 12V rating as the H4651, though the two are distinct ANSI types and are not interchangeable between beam positions.
The 1995 low beam headlight position on the Hino FF3020 is specified as H4652 rather than H4656. The H4652 is described as a variant of the H4651, which distinguishes it from the H4656 used in all other listed low beam years.
Because the H4651 and H4652 are related variants within the same sealed beam family, their physical format is identical, but substitution between beam positions should not be assumed without confirming ANSI output specifications, as each type is rated for a specific beam function.