let me rephrase what the previous user said. i ride bmx and i know almost eveything about bikes. your chain gets loose because your frame dropouts are striped. when you pedal the strip is going towards the frame so your chain gets loose. the only best idea is to get washer, bring to bike shop to resurface it flat and recreate the integrated chain tensioner, or go on daqnscom.com to buy some chain tensioners that work really well.
Most chainsaws that have chains run on a rail that slides in and out to tighten. Loosen it to twist chain then extend it again and tighten.
how do you tighten a chain on a 150 ATV
How do you tighten chain on polaris predator 500?
how to tighten the front chain axle
How do you tighten chain on 1995 kawasaki ninja zx6r
you shorten the chain links
you shorten the chain links
Cannot tighten, Replacement is the only fix for loose transfer case chain.
you tighten it derrr!!
With tools,
1. By pushing the heavy object with pulling 2. Using simple lever, chain/rope and pully, rollers, wheels, poles, tacks etc.
Should be able to slide the thing chain rides on back-forth. Unlock, move fwd & tighten.