Why is a PMDC motor getting hard, when on load after 10 years of service?

[Hobbyist]

I have literally pushed the carbon brushes out to rule out it's hindrance (if any). I will check the operation and revert back.

status remains the same

 

[Hobbyist]

I have literally pushed the carbon brushes out to rule out it's hindrance (if any). I will check the operation and revert back.

Status remains the same even after putting the carbon brush out of the way of armature.

 

[Hobbyist]

Is the driving gear of the planetary gearbox attached to the motor armature? Is it plastic or metal? Are you swapping armatures relative to the rest of the gearbox or keeping them as units? Does a new motor armature run freely with an old planetary gearbox?

I am thinking that the gear on the old motor is worn and causing extra friction, or there is wear or play in the gearbox that makes it intolerant of all but a new motor gear. You mentioned replacing the bearings - that's both bearings on the motor shaft. correct?

I would definitely try the current comparison.

Yes, the driving gear of the planetary gearbox, i.e. the white plastic spur gears are attached to the motor armature via. the shaft of the motor. Yes, correct i have replaced both the bearings.

 

[Hobbyist]

Is the driving gear of the planetary gearbox attached to the motor armature? Is it plastic or metal? Are you swapping armatures relative to the rest of the gearbox or keeping them as units? Does a new motor armature run freely with an old planetary gearbox?

I am thinking that the gear on the old motor is worn and causing extra friction, or there is wear or play in the gearbox that makes it intolerant of all but a new motor gear. You mentioned replacing the bearings - that's both bearings on the motor shaft. correct?

I would definitely try the current comparison.

Is the driving gear of the planetary gearbox attached to the motor armature? Is it plastic or metal? Are you swapping armatures relative to the rest of the gearbox or keeping them as units? Does a new motor armature run freely with an old planetary gearbox?

I am thinking that the gear on the old motor is worn and causing extra friction, or there is wear or play in the gearbox that makes it intolerant of all but a new motor gear. You mentioned replacing the bearings - that's both bearings on the motor shaft. correct?

I would definitely try the current comparison.

When i pull the door with a new motor and the old gear assembly (decoupled from the faulty motor), everything is fine. However, when i pull the door with the faulty motor and a new gear assembly (decoupled from a spare new motor), the pull becomes hard. Hence, i can conclude that it is something inside the motor that is making the operation hard.