The Link Joiner 2 connects sections of the operator chain assembly inside Marantec rail systems.

It is used to:

• reconnect broken chain sections
• join trolley drive components
• repair worn chain connectors
• restore chain tension transfer between motor and trolley

The connector is commonly found in:

• residential chain-drive garage operators
• Marantec M-Line systems
• older Comfort series rail assemblies

Compatibility

The Link Joiner 2 is intended for:

• Marantec SK rails
• Older Marantec chain-drive systems
• Rail assemblies produced between 1999 and 2006

Likely compatible operators include:

• Marantec M4500
• M4700
• Q-series rail systems
• Older Comfort operators

Compatibility depends on:

• rail generation
• chain profile
• trolley style
• connector geometry

Installation Notes

Typical installation procedure:

1. Disconnect opener power
2. Release door from trolley
3. Open rail access section
4. Remove damaged connector
5. Align chain ends
6. Install joiner halves
7. Tighten retaining screws
8. Re-tension chain if required

Technician discussions on garage-door forums confirm:

• replacement is generally straightforward
• connector assemblies are often replaceable without replacing the full rail

Common Failure Symptoms

A failed Link Joiner 2 may cause:

• chain slipping
• partial door travel
• clicking inside rail
• trolley disengagement
• operator running without moving the door

Garage-door technicians specifically describe:

“the white plastic piece that fastens the chain together inside the rail system”

(The Company reserves the right to amend product specifications and information without notice.)