ZX330-5G Track Adjuster

Brand: HITACHI

Type: Excavators

Model: ZX330-5G

Track Adjuster or Track Tensioner

To set tension and allow for routine adjustments to track tension a track adjuster is built into the center of a track spring assembly. Often, the track adjuster consists of a track cylinder that allows for grease to be added and removed through grease valves, seals to contain grease, a cavity to hold grease, and a rod with the ability to extend and retract from the cylinder's housing.

Track Cylinder Piston or Cylinder Rod

The track cylinder piston sits inside of the cylinder housing with one end contacting the grease cavity of the housing and the other end extending outward from the housing. As grease is pumped into the cylinder the piston extends further outside of the housing, and in turn, the distance between the far end of the track spring assembly and the other end of the assembly (connected to the idler wheel) increases. Increasing the distance of these two points adds tension to the track. Reducing the amount of grease in the cylinder shortens the distance and loosens the track.

Grease Valve

A simple grease valve allows for adding grease to the track spring assembly while often a threaded bolt allows grease to exit the cylinder.

Seals

Seals inside of the track spring cylinder on the piston contain grease in the cavity while allowing for grease to lubricate the piston and also prevent corrosive elements and debris from entering the cylinder.

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