Marantec 118798, Trolley Replacement Kit for 7', 8', & 10' Doors
The Marantec 118798 trolley kit replaces the moving carriage assembly that rides inside or along the opener rail. When a trolley wears, cracks, strips, or no longer locks properly to the emergency release, the opener may run without moving the door, chatter during travel, stop short, or fail to reconnect after manual release. This kit is for 7 ft, 8 ft, and 10 ft rail/door applications and is commonly used on Marantec residential openers with compatible belt or chain rails. Trolley fitment depends more on the rail style than the motor head name alone. That means an M4700e, Synergy, Q-Line, or private-label Marantec-built opener may still require rail verification before ordering. If the belt, chain, rail end, or connector is also worn, those parts should be inspected at the same time.
Compatible With
- Compatible Marantec 7 ft, 8 ft, and 10 ft door/rail applications using trolley kit 118798
- Marantec standard belt rail systems where this trolley style is specified
- Select Marantec heavy-duty 2-piece rail systems when listed for this trolley kit
- Marantec M-Line, Q-Line, EOS, and Synergy opener families when the rail style matches
- Marantec M4500, M4500e, M4700, M4700e, M4900e, M50, and M55 applications with compatible rail/trolley setup
- Marantec Synergy Solo, Synergy 260, Synergy 270, Synergy 280, Synergy 360, Synergy 370, and Synergy 380 rail applications where confirmed
- Marantec Q7500, Q7700, and Q7900 style installations where the rail and trolley match
- Select Marantec-built private-label openers, including some Martin/Garaga/Precision-style references, only when the rail is confirmed compatible
Features & Specifications
| Manufacturer | Marantec |
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| Product Type | Trolley replacement kit |
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| Part Number | 118798 |
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| Application | 7 ft, 8 ft, and 10 ft garage door opener rail systems |
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| Compatible Operator Type | Residential Marantec belt or chain rail garage door openers |
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| Door Height / Rail Length | 7 ft, 8 ft, and 10 ft applications |
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| Notes | Rail style must be confirmed before ordering |
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Also Known As / Related Part Numbers
- 118798
- MAR-118798
- Marantec 118798
- Marantec trolley replacement kit
- Marantec trolley assembly
- Trolley kit for 7 ft 8 ft 10 ft doors
- Previous trolley references including 91570 in some searches
- Replacement trolley for Marantec garage door opener
Technician Note
The trolley must match the rail. Do not order by opener model alone if the rail has been changed, extended, or replaced in the past.
Before Ordering
- Confirm the garage door height and rail length are 7 ft, 8 ft, or 10 ft.
- Verify whether the rail is belt or chain and whether it is standard or heavy-duty style.
- Inspect the belt, chain, connector, rail end, sprocket holder, and emergency release parts.
- Check if the trolley is stripped, cracked, or failing to reconnect after manual release.
- Confirm the door moves freely by hand before reconnecting the opener.
Important Ordering Warnings
- A stripped trolley can be a symptom of a heavy or binding door. Replacing the trolley without correcting the door issue can cause repeat failure.
- Do not run the opener repeatedly if the motor runs but the trolley or door does not move correctly.
Professional Advisory
If the trolley failed suddenly, a technician should inspect door balance, springs, rollers, rail alignment, belt/chain condition, and travel limits before returning the opener to service.
Product Questions & Answers
What door heights does Marantec 118798 fit?
It is commonly listed for 7 ft, 8 ft, and 10 ft Marantec rail applications, provided the rail style matches.
Is 118798 for belt drive or chain drive openers?
It is commonly referenced for compatible Marantec belt and chain rail systems. The rail style should be confirmed before ordering.
Will this work on M4500e or M4700e openers?
It may work when the opener has the compatible Marantec rail/trolley setup. Confirm the rail style and door height before ordering.
Is this the same kit for 12 ft and 14 ft doors?
No. The 12 ft and 14 ft trolley kit is commonly listed separately as Marantec 115447.
What causes a trolley to fail?
Common causes include worn plastic, a stripped release mechanism, a binding door, poor door balance, belt/chain problems, or repeated force from a stuck door.
