Marantec 115447, Trolley Replacement Kit for 12' & 14' Doors

Marantec 115447, Trolley Replacement Kit for 12' & 14' Doors

The Marantec 115447 trolley kit is the taller-door version used on compatible 12 ft and 14 ft Marantec rail systems. On these installations, the rail and travel length are different from standard residential 7 ft and 8 ft setups, so the trolley kit must match the door height and rail family. A worn or damaged trolley can cause the opener to run without moving the door, fail to reconnect after emergency release, make clicking or grinding noises, or create uneven travel. This kit is commonly associated with heavy-duty 1.2mm / 18 gauge 2-piece rail and standard belt rail references. Because taller doors put more travel length and load cycles on the rail system, technicians should also inspect the belt, rail, door balance, top bracket, and spring system before replacing only the trolley.

Compatible With

• Marantec 12 ft and 14 ft door/rail applications using trolley kit 115447
• Marantec heavy-duty 1.2mm / 18 gauge 2-piece rail systems where this trolley is specified
• Marantec standard belt rail systems for 12 ft and 14 ft applications where compatible
• Select Marantec M-Line, Q-Line, EOS, and Synergy opener installations with matching tall-door rail setup
• Marantec residential opener heads used on taller doors only when the rail and trolley style match
• Tall sectional door applications where the Marantec parts diagram calls for 115447

Features & Specifications

Also Known As / Related Part Numbers

• 115447
• MAR-115447
• Marantec 115447
• Trolley replacement kit 12 ft 14 ft
• Marantec tall door trolley kit
• Trolley kit for HD 1.2mm 18 gauge rail
• Trolley kit for standard belt rail
• Related to 118798 for shorter 7 ft 8 ft 10 ft doors

Technician Note

This is the tall-door trolley kit. If the door is 7 ft, 8 ft, or 10 ft, the common trolley reference is 118798, not 115447.

Before Ordering

• Confirm the garage door is 12 ft or 14 ft tall.
• Verify the rail type is compatible with the 115447 trolley kit.
• Inspect belt condition, belt connector, rail end assembly, sprocket holder, and emergency release parts.
• Check the door balance and spring system before replacing the trolley.
• Confirm the top door bracket and arm connection are secure.

Important Ordering Warnings

• Do not install a tall-door trolley kit on a shorter rail system unless the Marantec parts diagram specifically confirms it.
• A failed trolley may indicate a heavy, binding, or poorly balanced door that needs service.

Professional Advisory

Tall residential doors can place extra load on opener hardware. If the trolley failed, have the spring balance, cable condition, track alignment, and rail system inspected before normal operation.

Product Questions & Answers

What door heights does Marantec 115447 fit?

It is commonly listed for compatible 12 ft and 14 ft Marantec rail systems.

Is 115447 the same as 118798?

No. 118798 is commonly listed for 7 ft, 8 ft, and 10 ft door applications. 115447 is for 12 ft and 14 ft applications.

What rail types are commonly associated with this trolley?

It is commonly associated with Marantec heavy-duty 1.2mm / 18 gauge 2-piece rail and standard belt rail references where the rail setup matches.

Can I order by opener model only?

It is better to verify rail length and rail style. The same opener head may be used with different rail lengths.

What else should be replaced with the trolley?

Only replace related parts if worn, but inspect the belt, connector, rail end, sprocket holder, door arm, and top bracket during the repair.