LiftMaster 041B0035B Curved Door Arm Section
The LiftMaster 041B0035B is a curved door arm replacement section used as part of the connection between the garage door and opener trolley. It works with the straight arm section to transfer opener movement to the door.
A curved door arm may need replacement if it is bent, rusted, missing, incorrectly drilled, or damaged from a door obstruction or improper installation. Proper arm angle and attachment are important for smooth travel and reliable reversal performance.
Compatible With
This curved arm is used with various LiftMaster and Chamberlain garage door opener rail assemblies. It is also commonly associated with Chamberlain Group family brands using compatible arm hardware.
- Select LiftMaster garage door opener rail assemblies
- Select Chamberlain garage door opener rail assemblies
- Select Craftsman/Sears openers using Chamberlain Group rail and arm hardware
- Select Raynor private-label residential openers using compatible Chamberlain Group hardware
- Applications using the matching straight arm and door bracket layout
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster / Chamberlain |
| Product Type | Curved Door Arm Section |
| Part Number | 041B0035B |
| Common Number | 178B35 |
| Application | Connects garage door to opener trolley when paired with straight arm |
| Compatible Operator Type | Select residential garage door opener rail assemblies |
| Notes | Confirm rail assembly, arm geometry, and door bracket position. |
Also Known As / Related Part Numbers
These numbers and terms are commonly associated with this item. Related part numbers should be matched to the opener parts diagram before ordering.
- 041B0035B
- 41B0035B
- 178B35
- 178B35B
- 178B32
- 4178B35
- 4178B0035B
- Curved door arm
- Garage opener curved arm section
Technician Note
If a door arm is bent, check the door balance, top section reinforcement, opener force settings, and travel limits before replacing the arm. A bent arm can be a symptom of a binding door, hard stop, or incorrect opener setup.
Before Ordering, Confirm
- The original arm shape and length match this curved arm section
- The opener uses a compatible LiftMaster or Chamberlain style rail assembly
- The straight arm and door bracket are present and in usable condition
- Mounting holes and fasteners line up without drilling unsafe new holes
- The garage door is balanced and moves freely by hand
Professional Advisory
Door arm service involves moving hardware under load. Disconnect opener power and release the trolley before working on the arm. If the door is heavy, out of balance, or has damaged sections, have a qualified garage door technician inspect the door before returning the opener to service.
Important Ordering Warnings
- Do not use this arm to compensate for a damaged or weak top door section.
- Do not drill new arm holes unless the opener instructions support the layout.
- A curved arm section normally works with a straight arm; it is not always a complete arm kit by itself.
- Incorrect arm angle can affect travel and safety reversal operation.
Questions & Answers
What is the LiftMaster 041B0035B used for?
The 041B0035B is the curved door arm section that helps connect the garage door to the opener trolley when used with the proper straight arm and door bracket.
Is 178B35 the same as 041B0035B?
178B35 is a common related number for this curved door arm section. Match the part number and arm style to the opener parts diagram before ordering.
Does this include the straight arm?
This listing is for the curved door arm section. If the straight arm, door bracket, clevis pin, or fasteners are missing, those parts may need to be ordered separately.
Why would a curved door arm bend?
A curved arm can bend from a binding door, incorrect travel limits, excessive opener force, damaged door sections, or improper installation geometry.
Can this fit Craftsman or Raynor openers?
It may fit select Craftsman/Sears or Raynor openers built on compatible Chamberlain Group platforms, but the rail assembly and original arm style should be verified.
