Master Pins and Accessories for Track Chains

Master Pins within the End Link System

Master pins connect chain sections within a track chain. They are mainly used in the area of end links and serviceable chain joints for repair, maintenance and undercarriage service work.

The technical design depends on the chain series, chain pitch, end link geometry and the respective pin-and-bushing system. All components within the connection must be technically compatible.

Master Pins as Part of the Chain Connection System

A master pin does not operate as an isolated part. It is part of a connection system consisting of pin, bushing, seal, spacer and locking components.

This connection system links the individual track links within the undercarriage chain. Even minor differences in pin design, bushing, seal or locking method can affect fitment and function.

Press-Fit Master Pins and Hammer-Lock Pins

Different master pin systems are used depending on the track chain design.

Master pins are used in serviceable chain joints and allow individual chain sections to be separated where the chain design permits this.

Press-fit master pins are designed for chain versions with a press-fit connection. The fit between pin, bushing and track link is critical for correct function within the chain assembly.

Hammer-lock pins use a defined head geometry for positioning and anti-rotation within suitable end link systems.

End Bushings, Seals and Spacers

In addition to the master pin itself, further components are part of the connection system of an undercarriage chain.

End bushings form the mechanical connection within the track chain together with the pins. Depending on the chain design, seal rings, seal kits, plugs or additional sealing elements may be required.

Spacers and spacer washers position individual components within the connection and must match the respective chain series and end link design.

Locking Pins and Securing Elements

Depending on the chain design, locking pins, retaining pins or comparable securing elements are used to secure master pins.

The correct version depends on manufacturer, chain series and end link system. Reliable identification should therefore be based on reference number, track chain or machine model.

When Are Master Pins Replaced?

Master pins are commonly replaced during repair and maintenance work.

• Replacement of a damaged end link
• Installation of a repair link
• Repair of an undercarriage chain
• Opening a track chain for maintenance work
• Overhaul of a track chain
• Replacement of damaged connection components

On older or heavily worn undercarriage chains, pins, bushings, seals and locking elements should be evaluated as one connected system.

Why Similar Master Pins May Not Be Interchangeable

Compatibility is not determined by length or diameter alone. Press fit, locking method, end link geometry, bushing design and chain series must also match.

Visually similar master pins may therefore not be technically interchangeable. Reliable identification is based on reference number, chain series or machine model.

Identifying the Correct Master Pin

When selecting a master pin or accessory, chain series, chain pitch, end link design, reference number and machine model are particularly relevant.

The LIS® Undercarriage Finder supports the identification of suitable undercarriage parts by manufacturer, model, machine version and serial number.

Master Pins in Relation to Track Chains and Repair Links

Master pins are often replaced together with end links and repair links. For the repair of individual chain sections, suitable repair links and master links are relevant.

If the complete track chain is worn, suitable undercarriage chains are available in the categories track chains, oil-lubricated track chains, grease-lubricated track chains and sealed dry track chains.

If track chain and track shoes are required as a pre-assembled unit, the category complete track groups is relevant.

Master Pins and Accessories from LIS®

The LIS® range includes master pins, end bushings, seals, spacers, locking pins and further connection components for numerous track chains and undercarriage chains. Selection is based on reference number, chain series or machine model.