The Hino FF3018 high beam headlight uses an H4651 bulb size while low beam headlights require either H4652 or H4656 bulb sizes for proper illumination. The replacement chart covers vehicle production years spanning 1993 to 1995 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 H4651, H4652, and H4656 bulb types are all sealed beam units conforming to ANSI standards recognized in both the United States and Canada. Each operates at 12V and follows the 4x6-inch rectangular sealed beam format, which is a standardized form factor widely used in commercial vehicle lighting.
Sealed beam units of this type are not serviceable at the bulb level. When a unit fails, the entire assembly is replaced rather than an internal filament or capsule, which is a defining characteristic of the sealed beam design.
The Hino FF3018 uses the H4651 for the high beam headlight across the 1993-1995 model years, making it the most consistent fitment in these specifications.
The low beam headlight position shows a variation in the 1994 Hino FF3018, which uses the H4656 rather than the H4652 fitted in 1993 and 1995. These are distinct part numbers and are not interchangeable despite sharing the same physical format and voltage rating.
The H4652 is classified as a variant of the H4651 within the ANSI sealed beam family. Both share the 4x6-inch rectangular format and 12V rating, but they carry different ANSI designations that correspond to different beam patterns, specifically high beam for H4651 and low beam for H4652.
Because the H4651 and H4652 are physically identical in size and voltage, there is a risk of incorrect installation if part numbers are not verified before replacement. The beam pattern difference between the two makes correct identification necessary for proper headlight function.