6V6778 Latch for Caterpillar Equipment

6V6778 is a mechanical latch used on Caterpillar heavy equipment for securing doors, covers, and access hoods. The part is a left-hand, two-rotor latch designed for use with a 0.675 in (17.1 mm) diameter striker bolt and mounting hardware of M6 or 1/4-20 size.

This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts). The latch is listed for Caterpillar articulated dump trucks, earthmoving compactors, and engines installed in machines.

Fitment

The latch is used on the following Caterpillar equipment models:

• Caterpillar D250E articulated dump truck
• Caterpillar D250E II articulated dump truck
• Caterpillar D300E articulated dump truck
• Caterpillar D300E II articulated dump truck
• Caterpillar 825G earthmoving compactor
• Caterpillar 3054 engine-machine application
• Caterpillar 3056E engine-machine application
• Caterpillar 3126 engine-machine application
• Caterpillar 3204 engine-machine application
• Caterpillar 3304 engine-machine application

Equipment application is determined by the machine configuration and the existing latch and striker arrangement. Before installation, verify the left-hand position, the two-rotor design, the striker bolt diameter, and the mounting thread or fastener size.

Cross-reference numbers

• 6V-6778

6V6778 and 6V-6778 refer to the same part number format, with the hyphenated form used as an alternate written designation for the Caterpillar equipment application.

Specifications

The component is supplied as a latch assembly. The stated dimensions and weight apply to the part as listed. The available data identifies the latch body, its rotor configuration, mounting requirements, striker compatibility, material, finish, and external dimensions; additional mounting hardware or a striker bolt is not specified as included.