How To Replace The Sprockets On A Bulldozer

[Music] hello and welcome back to another episode of the DIY guy alright today we're gonna be showing you how to change the rear sprockets on your dozer we're using this John Deere 350 B here as you can see when we try to turn or steer the dozer the track chain slides up on top of the sprocket because the sprocket is so worn so we're gonna show you how to replace your rear sprockets without separating or taking the track apart all right so the first thing we want to do is grab a gift act on a 15 16 socket and we'll go ahead and loosen the top five or six bolts that we can get to if you don't have an impact gun you can use a breaker bar all right so now that we have those five or six top bolts removed you can go ahead and back the dozer up on two blocks putting the block on the flat bottom roller closest to the sprocket and then we can go ahead and make sure that we can get to the other five or six bolts holding the sprocket on I'll go ahead and put the blade of the dozer down to pick up the front of the dozer and get the front part of the tracks off the ground once we have the dozer set up on the blocks and the tracks is lifted up we can go ahead and unpackage our new sprocket all right so now that we have our new sprockets in packaged we can go ahead and grab a come-along we're gonna hook one end around the track adjuster piston in the front right next to the front roller or wheel and the other side we're going to attach right to the track chain right on the backside of the sprocket next we're gonna grab a three quarter inch wrench we're going to loosen the lock nut or jam nut and then we go ahead and grab a 1/2 inch wrench and loosen the bolt in the middle all the way once you get that loosened that's where the grease is gonna come out all right so once we have that half inch bolt removed we can go ahead and slowly tighten the come-along a couple clicks at a time letting the grease push out of the track adjuster piston we'll go ahead and use a putty knife and scoop it up and put it on a piece of cardboard so we don't make too much of a mess we'll just keep repeating that process till we got the track adjuster all the way in and all the grease pushed out of it all right so now that we have that track adjuster pushed all the way back and all the grease pushed out you can see the track is nice and loose now we're gonna go ahead and grab a rubber junk belt that we have lying around we're gonna feed it through the track chain up past the pads or grousers then we're gonna go ahead and grab a strap and hook it up to the handlebar grab bar right next to the seat and then through that rubber belt we'll go ahead and ratchet it tight we want it to pull back so we're gonna go in a little bit of an angle that way it'll help pull the extra slack towards the back of the rear sprocket all right so as you can see we've snugged up that strap you can see the track chain pull the tension towards the rear sprocket which is what we want and what is much slop or extra track chain in the back via the sprocket to make it easier to get the sprocket off next we can go ahead and remove the come-along off the track chain down below in the front track adjuster what we're gonna do is hook it to the back of the cage we're gonna go ahead and take another old belt run it through the track chain and through the browser pad and hook it to the come-along we'll go ahead and tighten that up to full upward over the top of the rear sprocket to give us a little more room alright so this is what you should have the junk rubber belt going through the track chain in the front hook to the strap going up to the grab bar or handlebar next to the seat somewhat snug and tight pulling that track chain back then we have another junk belt going through the track chain in the back right over the top of the sprocket one another come along hooked to it and the other end to here hook to the top of the cage pulling upward alright so now that we got the strap hooked up and the come-along we're now ready to go down to the sprocket remove the last four or five bolts you can remove them by hand if you have them that loose if you don't in bed use your breaker bar and socket or your impact and socket to remove the rest of the bolts be careful when removing the last one the sprocket may pop off depending on how long it's been on there this one's been on there for a little while so we're gonna go ahead and get a bar give it a few taps to break it loose [Music] once we have the sprocket pop loose this next step is easier two people one person to wiggle the track chain and one person to grab the sprocket and pull it out here is the old sprocket sitting on top of our new sprocket so you can see the difference on how much worn down the old sprocket is you alright next you want to make sure your threads are clean you can take an air hose and blow them out also if you have excessive rust buildup on the mating surface you go ahead and wire brush that as well so now we're ready to put the new sprocket in same thing it's easier to people one person to kind of wiggle the track one person to set the sprocket down inside you may want to use a pry bar to lift the track chain up and over the sprocket or to adjust the sprocket you have you got a set of these two ladies slippers they call them the old-timers once we get it close we'll use a roll pan pry bar or alignment tool we'll slide it in one of the bolt holes and align the rest of the bolt holes and then start the bolt in you once we have all the bolts finger tight we can go ahead and tighten what we can with our impact and socket or breaker bar and socket all right so now that we have those four or five sprocket bolts tight that we could reach with our impact and socket we can go ahead and release the come-along and remove it we're also gonna remove the belt from the track chain next we'll go ahead and remove the strap off the top of the handlebar releasing it and also removing that belt from the track chain as well all right next we can grab the half inch bolt we removed from the track adjuster we'll go ahead and start that by hand we'll run it down hand tight well snug it up a little bit with Finch wrench next we can grab that 3/4 wrench and tighten the jam nut or lock nut once we have that bolt reinstalled we can go ahead and repeat the process on the other side to change that rear sprocket all right now that we have both rear sprockets replaced you can go ahead start the dozer drive it forward just a little bit just enough so we can reach those other bolts that we didn't tighten while it was up on top of blocks all right so we finished getting these sprocket bolts in and tighten down on both sides left and right next we can grab a grease gun we're gonna put grease back inside the track adjusters when we let them push out and tighten the track or put the proper tension on our track you can look that up in your owner's manual or find it online if you don't know each machine is different I will do the same thing on the other side once I have both sides pumped up and go ahead and test it out I like to run it for a little while to ensure that we have the proper tension on it full would never be able to push that much change [Music] the sprockets underdosing don't forget to click the link in the description which will take you to our website for a full write-up you can also click that subscribe button in the middle on the right we have a recommended video just for you and on the left you'll find our recent upload thanks for watching another episode of the DIY guy you

Channel: TheDIYGuyDOTnet

Views: 538,897

Rating: 4.696301 out of 5

Keywords: jd, john deere, dozer, undercarriage, john deere dozer, john deere 350, drive sprocket, jd 350b, undercarriage replacement, bulldozer, How To Replace The Sprockets On A Bulldozer, sprocket, construction equipment, farm tractor, deere, heavy equipment, chain and sprocket kit, drive chain, john deere b, farm and tractor, old tractors, 450 dozer, jd 450 dozer, john deere 450 dozer, 450c, deere parts, jd tractors, john deere service, roller chain, d6 dozer, chain sprocket

Id: 2of1eOSnRm4

Length: 11min 57sec (717 seconds)

Published: Wed Feb 07 2018