Track chain tensioner (grease cylinder) with part number 332/K5118 from the NEXGEN offer. It is a key component of the undercarriage, dedicated to heavy JCB crawler excavators model JS330 (manufactured in years 1997-2025). The tensioner is responsible for maintaining proper track tension, which is essential for proper traction and protecting undercarriage components from wear.
NEXGEN undercarriage products are characterized by high resistance to extreme pressures inside the cylinder and excellent sealing, which prevents grease leaks and loss of chain tension in difficult terrain conditions.
| Brand | Models |
|---|---|
| JCB | JS Excavators: JS330 (years 1997 - 2025) |
The tensioner is dedicated to heavy 33-ton excavators. It provides adequate tension force for large chains.
The tensioner works with the idler wheel and the tensioner spring (recoil spring). When replacing the tensioner, it is worth checking the condition of the grease valve (nipple) and spring seals.
The track tensioner system is under immense pressure (grease) and mechanical tension (spring). Never disassemble the tensioner without first safely releasing the grease pressure and ensuring the spring is secured. Improper disassembly risks death or injury.
Tensioner 332/K5118 maintains track tension.
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The tensioner is a hydraulic cylinder in which the working medium is solid grease injected with a grease gun. The pressure of the grease pushes the piston rod, which moves the idler wheel forward, tensioning the track.
Typically, number 332/K5118 refers to the hydraulic cylinder itself (piston + cylinder). The shock absorbing spring (recoil spring) is a separate item, rarely requiring replacement unless broken.
The spring at the tensioner is not for tensioning the track (grease does that), but for SHOCK ABSORPTION. When a rock gets into the track, the spring compresses, retracting the idler wheel and preventing the chain from breaking. The force of the compressed spring in a JS330 excavator can be over a dozen tons!
Do you have doubts or need confirmation to avoid costly downtime? Call us. Our experts will help you select the right part to get your equipment back to work as quickly as possible.
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