Carriage clamp mounting plate 331/56478 JCB 3CX/4CX, genuine

Carriage clamp mounting plate 331/56478 is a genuine JCB part for the JCB 3CX and 4CX backhoe loaders. According to the product card, this part is a carriage clamp mounting plate.

On sideshift backhoe loaders the carriage is clamped to the rear chassis rails by hydraulic clamps during work. The clamp bodies, pistons and mounting plates apply force to the shoes that grip the rails. When the operator selects sideshift, the clamps release, the carriage slides and is then clamped again. A worn clamp shoe or a leaking piston lets the carriage slip while digging. The clamp hoses and unions are checked for leaks. The clamp system pressure must be at the maker's value, as low pressure lets the carriage slip. The surfaces between the clamp shoes and rails are kept clean and free of grease.

Specifications

Compatibility

According to the product card, the part number is 331/56478. Fit is confirmed by the part number and the machine serial number. The catalogue also has the aftermarket version of this part. Other parts are in Backhoe arm.

Fitting

Large structural parts are fitted with suitable lifting equipment, with the machine made safe and the attachments lowered to the ground. Pins and bushes are cleaned and greased, and bolts tightened to the specified torque. After assembly the movement is tried slowly through its full travel to check that nothing binds.