KONE Elevator Door Buffer Roller

The word “buffer” can make this small roller easy to misunderstand.

A KONE door buffer roller is not an elevator pit buffer and it is not normally used to support the full weight of a moving door panel. It is a small mechanical roller fitted in compatible KONE landing-door lock, interlock, or door-coupling assemblies, where it helps guide contact and reduce direct metal impact during door operation.

Depending on the original door system, the part may also be described as:

• KONE door lock buffer roller

• KONE landing door buffer roller

• KONE interlock roller

• KONE door lock roller

• KONE car-door lock buffer

• elevator door scissors roller

First Confirm Where the Roller Is Installed

A useful identification photo should show the roller together with the surrounding lock or linkage. Once the part has been removed, many small door rollers look almost identical.

Before quotation, please provide:

• complete KONE part number, if visible

• roller outside diameter

• roller width

• centre-hole or shaft diameter

• fixing screw or pin structure

• flat or grooved contact surface

• roller material

• landing-door or car-door installation

• complete door-lock assembly photo

• front and side views

• quantity required

One commonly supplied KONE version is KM89639G02, described in market references as a landing-door or interlock buffer roller with an outer diameter of approximately 33mm. Other KONE buffer rollers are available in different sizes, including smaller 25mm versions, so the size should never be assumed from the product name alone.

A Small Roller Can Create a Large Door Fault

As the roller ages, its surface may harden, crack, flatten, or become loose on the shaft. The bearing or centre bush may also wear.

Possible symptoms include:

• impact noise around the door lock

• unstable landing-door engagement

• incomplete lock release

• excessive clearance in the linkage

• irregular door movement

• repeated door-lock or safety-circuit faults

Before replacing the roller, technicians should inspect the lock hook, mounting shaft, linkage, return spring, door alignment, and contact clearance. A bent bracket or worn shaft can damage a new roller quickly.

For enquiries from Saudi Arabia, Jordan, Egypt, Iraq, UAE, Kuwait, Brazil, Chile, Spain, and Italy, a close photo beside a ruler or vernier caliper together with the complete lock assembly normally provides enough information for preliminary matching.

Frequently Asked Questions

Is a KONE buffer roller the same as a door hanger roller?

No. A door hanger roller supports and guides the door panel along the track. A buffer roller is generally used in the door-lock, interlock, or coupling mechanism to guide contact and reduce mechanical impact.

Is every KONE buffer roller 33mm?

No. KM89639G02 is commonly listed as a 33mm version, but other sizes and part numbers exist. The old roller must be measured before ordering.

Can I order only from a photo?

A photo is helpful, but diameter, width, centre hole, mounting structure, and installation position should also be provided.

Should the roller shaft be replaced at the same time?

If the shaft, pin, or fixing screw is bent, loose, or heavily worn, replacing it together with the roller may provide more reliable operation.