HM386 tool retaining pin 331/55947 JCB, aftermarket

HM386 tool retaining pin 331/55947 is an aftermarket part for the JCB hydraulic breakers. According to the product card, this part is a tool retaining pin for the HM386 breaker.

Tool retaining pins hold the breaker tool in the front head and stop it falling out, while pin stoppers and plugs stop the pins themselves coming out. The tool strikes the pins with every blow, so they gradually wear and deform. A worn pin increases the tool's end float, and a mushroomed one makes it hard to remove. If a stopper or plug is lost, the pin can work out during operation and the tool can drop.

Specifications

Compatibility

According to the product card, the part number is 331/55947. Fit is confirmed by the part number and the breaker or machine serial number. Other parts are in JCB hydraulic breaker parts.

Fitting

Before working on the breaker, stop the machine, release the hydraulic pressure and lower the breaker to the ground in a stable position. If the nitrogen chamber is involved, release the gas pressure first as the maker instructs. After fitting the part, tighten the bolts to the specified torque, grease the tool bush and test the breaker briefly under light load.