HOW DO i SHORTEN THE DRIVE CHAIN ON THE DIGIDOOR 3

Depends which part. all the details in the link.

https://www.google.com/search?q=digidoor+3


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It is always better to get the remote for the door make you have. The same seller does a 4 button remote as well.

Digi 2 button remote transmitter for Digidoor motors (replaced ...

www.mrremote.co.za > product > digi-2-button-remote...

Sold with DigiDoor II (2), DigiDoor III (3), DigiDoor IQ and DigiDoor one garage door motors. This remote is also referred to as a Digi"e"Key, Digi Ekey, Digikey, ...

There is help here.

https://www.google.com/search?q=program+my+nova+remote+for+my+digidoor+2+garage+door

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The motor unit is adjustable so you can set the tension. Just loosen the bolts and slide the motor unit to slightly loosen the chain.

Curious to know why it needs shortening. The machine should have an automatic tensioner inside that keep the chain right. I am unaware of any way, or any need, to shorten the chain.
Get on YouTube or a Polaris site to see if all your internal parts are present and functioning correctly.

Two ways!

On the cable section of the chain use a cable shorten-er.

On the chain remove excess chain and install a master link/


Master link/ You would need to go to a bicycle shop to have the chain shortened.

Check to make sure you can not extend the rail before cutting chain. The cable shorten-ers will likely be available at an auto parts store. They are used to adjust the parking brake!

HJope this helps?

will need a digi door or roller door mechanic in your area
head office ? use contact us
DigiDoor Garage Door Motors Installations Repairs of DigiDoor 1000N...

three motor makes it harder
door drop is 15 cm is not a good thing

chain system needs to be retention ed
motors synchronized
event track may need to be re aligned

Sounds like you have a short bar length. A saw shop can shorten the chain for you, or buy the correct bar for this machine. The drive section position is fixed. Hope this helps!

need to adjust the bottom or close limit on the door operator, read in your owners manual for the correct procedure.

Unless you are changing sprocket sizes you can not shorten the chain because removing even one link would not allow the ends to connect. Are you adjusting the chain as needed? Why do you want to shorten it?

Even if the factory chain has no master link (some are continuous these days) you can still grind off two pins carefully and push out a link to remove the chain, or simply cut it. That is what you must do when replacing the chain.