lower carriage roller removal on a JD 450

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450user
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lower carriage roller removal on a JD 450

Post by 450user » Sat Feb 29, 2020 7:44 am

Can any of you give me some advice on the removal of the lower rollers on my 450? Does the entire carriage have to be disassembled, or can the roller(s) be removed without taking the outer or inner side plates off? Any advice would greatly be appreciated. Thanks.

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Re: lower carriage roller removal on a JD 450

Post by B Town » Sat Feb 29, 2020 8:02 am

The inner and outer rock guards should be removed. The entire undercarriage doesn’t need disassembled. At minimum, the track adjuster must be fully collapsed to slack the chain and pads. The crawler will need jacked and blocked. Depending on the amount of chain slack you may need to split the track by removing the master pin or alligator link if you have a two piece master link.

Lots of patience to get those lower roller bolts out. An impact gun has worked the best for me. Some bolts are so stuck that heat is needed. And rarely blown out, drilled out, re-threaded or heli-coiled.

Best regards, Bruce

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Re: lower carriage roller removal on a JD 450

Post by 450user » Sat Feb 29, 2020 2:36 pm

So if I unbolt the 4 bolts that hold the roller onto the rail, it should drop out? I've attached a couple of screen shots f the carriage assembly and roller break down. If they do does attach to the post, the roller would have 2 bolts mounting the ends to the lower rail, pictured as #7 in the assembly.

https://www.dropbox.com/s/okhlqk7rtqix5 ... 1.png?dl=0

https://www.dropbox.com/s/ekn4zhmdppi5q ... 6.png?dl=0

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Re: lower carriage roller removal on a JD 450

Post by B Town » Sat Feb 29, 2020 2:42 pm

Yes, 2 bolts on the inside, 2 bolts on the outside. And the roller drops out. I couldn’t open the pics, it wants me to put an app on the phone(sorry just not into apps).

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Re: lower carriage roller removal on a JD 450

Post by 450user » Sat Feb 29, 2020 2:55 pm

That's definitely doable. I have the track & chain removed, and looking at replacing all of the 5 rollers on the left hand side. That's a lot of less work then dismantling the entire carriage!!! Thanks for the heads up. Much appreciated.

P.S.: I got the assemble drawing from the JD parts site. Wish me luck!!! Thanks again.

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Re: lower carriage roller removal on a JD 450

Post by Jim B » Sat Feb 29, 2020 4:00 pm

Numbers 7, 8, and 9 are called the guards (often rock guards), I think those are what you referred to as side plates. Yes, removal of at least one is required to get a roll out, the outer one is the one recommended for removal. You remove the outer guard and loosen the inner one. To remove the outer guard you have to at least remove the outside nuts (#12) from the bolts holding the bushings (#13) between the inner and out guards as well as the bolts holding it to the track frame. Of course the crawler has to be blocked up solidly (wood or meatal not concrete blocks), high enough to work on and to get the rolls out between the track frame and floor/ground in your case. They can be changed without taking the chains (with pads) off. Do you have service manual SM2064 for your 450? It should have info on doing this and other repair tasks. HTH

Jim

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Re: lower carriage roller removal on a JD 450

Post by 450user » Sun Mar 01, 2020 2:53 pm

I don't have the service manual handy. Not sure where to get my hands on one either. eBay have many service manuals available for the 450, But I'm not sure which one I should buy for my machine. I own a straight 450, so mid-70's?? I will take the service manual number you mentioned and see if I can locate the manual for my machine. I was hoping to not have to unbolt one of the rock guards in order to drop the 5 rollers, but it looks like I will not be spared the trouble in doing so!!! LOL!!!

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Re: lower carriage roller removal on a JD 450

Post by Jim B » Sun Mar 01, 2020 3:19 pm

You really need to confirm what yours is. By serial numbers the straight 450s were built 1965 into 1970 and the 450Bs started production in 1970. In 1974 they started building the 450Cs while 450B production continued into 1976 it appears. If you post your entire serial number we can help you decode it, to be sure it is a straight 450. Mid -70s would put you in the 450B series, maybe even a 450C. I believe Lavoy (email him at postmaster@jdcrawlers.com or call him during business hours at the number on the homepage) can help you with the manuals, but you should be sure of what you have first as the manuals changed for the series in most cases. I'm sure if you have the serial number when you contact him, he can tell you, as well. Stan Disbrow has a post (the 17th or 18th post down) on the FAQ Board that list the manual numbers for many of the machines. You should get the Service (or Technical as JD calls the later ones) manual and Operator's manual for you crawler. You apparently already use the on line parts catalog based on your earlier post. HTH
Jim

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Re: lower carriage roller removal on a JD 450

Post by 450user » Sun Mar 01, 2020 7:19 pm

Unfortunately, the serial # plate for my machine is missing. Even though I can ID the location where it should be, I have no idea as to what year it was manufactured..

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Re: lower carriage roller removal on a JD 450

Post by Jim B » Mon Mar 02, 2020 6:31 am

Where was your tag located? That can help narrow the range as the tags moved during 450B production. Is your serial number tag on the engine? That might help give an idea ( never a sure thing due to possible swaps) as the straight 450 was a 4-202 and the Bs started using the 4-219. Also look at the fuel tank, does it have a sump bowl you can drain on the bottom of the tank?

There is a post by CatD8RII, in which he says at least some had numbers stamped on the top of the transmission/differential case. Here is a link to the post so you can check yours out.

viewtopic.php?f=8&t=13074&p=73613&hilit ... ion#p73613

These things may help get you to being fairly certain on the model series, even if not the actual serial number. You can use the parts catalogs to cross check components between the different series to yours. Fuel filters changed, fuel injection pumps changed, etc. Steering clutches were a big change during the late 450B production and into the 450Cs when they started using wet clutches. Again they won't pinpoint a certain machine but can narrow the range.

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Re: lower carriage roller removal on a JD 450

Post by 450user » Tue Mar 03, 2020 6:10 pm

The plate was originally, as your sitting in the machine, would be facing the inside of your right leg, towards the floor pan. You can see where it was located, by the paint that is not discolored where it would if been mounted.

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Re: lower carriage roller removal on a JD 450

Post by 450user » Tue Mar 03, 2020 6:18 pm

On another issue, I removed the outside lower carriage guard today by removing the 12 bolts, from the main rail carriage heavy channel iron. Then I unbolted the 10 bolts securing the roller flanges to the main frame as well as the ones holding the roller flange to the opposite inside frame. Long story short, the rollers will not fall out since the flanges of the rollers won't allow the roller to be tipped significantly enough as to allow it to slip out of the inside. So both lower shield have to be removed if the rollers are to be replaced.

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Re: lower carriage roller removal on a JD 450

Post by Jim B » Tue Mar 03, 2020 7:45 pm

The location of the missing tag indicates it is a straight 450 or a 450B serial number 142199 or prior. Is the serial tag still on your engine (located on the block between the fuel transfer pump and starter)? That might narrow it to the 450 or 450B. Injection pump numbers might be another clue. Hopefully you find something on the transmission case as CatD8RII posted.

Did you loosen the inner guard, let it hang loose and try getting a roll out before removing the inner guard? Just curious, that was the procedure in a 450B manual.

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Re: lower carriage roller removal on a JD 450

Post by 450user » Fri Mar 13, 2020 7:25 pm

I did indeed try what you originally suggested, but the flanges of the roller won't drop out of the main heavy C channel, therefor the roller has to drop out straight down, and any slight angle will cause it to bind and not budge. It might of been just easier to actually remove the entire carriage, and flip it upside down to work on, rather than on my back.. Just saying!!!

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