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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

John Deere 450b dozer

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crotchrocket25

09-23-2006 10:30:07

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Well we have decided to break our 450b down. Its been overheating and there is water in the oil. It looks like milk. Were not sure what the problem is. We just started breaking it down and already have a hard time getting the big steel radiator shroud off. This piece must weigh 300 lbs. All bolts are off including the skid plate. Any suggestions to what our problem is? Water in the oil? And how to get this shroud off. We have a small tractor wiht loader but it didn't want ot budge it either. thanks This will probably be the first of many questions as we get into this project.

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John Wood

09-23-2006 14:45:45

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Re: John Deere 450b dozer in reply to crotchrocket25, 09-23-2006 10:30:07

I am just going through a similar situation as yourself, only my crawler loader is the 450 (earlier model). My engine had water in the oil and I decided to take the engine out as I was certain I would find other thigs that needed repair/replacement.

As JDemaris said, there are three bolts either side where it bolts on the channel. You would need to lift the weight with a chain using your tractor, being careful to clear the radiator when doing it.

I found my cylinder liner "O" ring seals shot also, there was signs of cavitation from not being treated with SCA's by previous owners. In my case, the engine clearances were all at maximum or more. I ordered a major engine overhaul kit - I bought through the JD dealer. However, there are other suppliers out there who are about half the price (I later found out) - Reliance parts being one of them. Do a google search and you should come up with several ones. I am also doing the clutch and several other items while the engine is out.

My progress is slow even though I have the space and place to work on the machine. I am now starting to put it back together after major cleaning etc.

HTH

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jdemaris

09-23-2006 11:41:59

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Re: John Deere 450b dozer in reply to crotchrocket25, 09-23-2006 10:30:07

Why are you taking the heavy nose off the crawler? Not necessary unless you're pulling the engine out. For an in-frame motorjob, you just pull the belly-pan off and hood off. Then, pull the head off and pull the oil pan off. #1 problem when there's coolant in the oil is the sleeves, sleeve seals, or both. Yes, there could be other issues. Once you pull the oil pan off and look inside, you'll know. You will probably see rust and stain marks along sleeves if there's been coolant leaking. It's a very common problem in high-hours engines.

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crotchrocket25

09-23-2006 13:47:36

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Re: John Deere 450b dozer in reply to jdemaris, 09-23-2006 11:41:59

The radiator needs repaired too. Probably need a new one. Its been patched several times. So do you know how to get the heavy front shroud off?

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jdemaris

09-23-2006 14:27:17

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Re: John Deere 450b dozer in reply to crotchrocket25, 09-23-2006 13:47:36

I admit it's been a few years since I pulled a 450 apart - I haven't worked as a Deere mechanic for almost 20 years. And - as far as Deere goes, I only own a few 1010 and 350 crawlers. My big ones are ACs. But, as I recall, if you must remove it - after the belly-pan bolts are out (on the bottom), you take out the three bolts on each side where it attaches to the side-frames - and then slide it out towards the front away from the crawler. Takes a couple of guys holding it - or have it attached to a chain-hoist. I think you can leave one bolt in on each side and let it tip downwards, out of the way - to take the radiator out. If that works - it's a lot easy then taking the thing off. I replaced many radiators out in the field and woods - by myself - without a hoist - and I THINK that's how I did it. Maybe someone out there can give you more accurate info?

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Phil - MO

09-23-2006 19:10:36

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Re: John Deere 450b dozer in reply to jdemaris, 09-23-2006 14:27:17

I just had the nose off a couple of weeks ago on my straight JD 450 Loader. Get used to it. It seems that any oil leak, radiator leak, or hydraulic pump problem is up front and requires you to remove the nose. The spline drive on the hydrualic pump went out on mine not too long ago.
I used a gantry and chain hoist the first time and the last two times I used a boom hoist on my reg. tractor and a chain hoist attached to the boom to lift with.

Raise the bucket and block up. My loader didn't come with the factory safety bucket holder so I made one out of 3" angle iron to block bucket up for safety as per operating or service manual size instructions. I believe it was 24" long. (Be sure to remove when done before lowering bucket.) and don't skip this step because you will be working under the bucket.
Remove screen in front of nose with one bolt and tilt out. Take two bolts off of filter housing attached to nose inside front or you will break hoses.
Previous post is right, remove skid plate as you have already done, and I backed boom into center before removing 3 bolts on each side of nose. I strung a chain through the radiator opening and the front of the nose watching out for the radiator, attached to chain hoist, took up the slack and then removed the three bolts on each side. You will have to rock it forward and up with the chain hoist. With the slack off and rocking the nose forward you should break it loose. Watch clearances on the radiator as you raise it and pull it forward. Be careful, as you already know it's heavy. I have done it by myself, but a helper would be good. It's hard to hold the nose away from the loader and lower it at the same time. Watch out for the radiator or you will be repairing it. Good luck.

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crotchrocket25

09-24-2006 03:47:06

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Re: John Deere 450b dozer in reply to Phil - MO, 09-23-2006 19:10:36

thanks for your comments. were going to keep working on it. It just seems stuck. I don"t see any other bolts holding it. We used our kubota and loader and hooked a chain on it and started to pull but didn"t want to pull to hard and bend anything. Will keep working on it.

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crotchrocket25

09-24-2006 17:42:48

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Re: John Deere 450b dozer in reply to crotchrocket25, 09-24-2006 03:47:06

Hey Phil thanks for your help. I wanted to let you know we got the front shroud off today. Were about ready to pull the motor. How many bolts to pull the motor? I see 4. Any advise would be appreciated. thanks

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MN Scott

09-24-2006 21:07:37

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Re: John Deere 450b dozer in reply to crotchrocket25, 09-24-2006 17:42:48

Yep there are four bolts holding the engine to clutch housing. Also remove the starter, fuel lines, wires, cables ect. Also the front pump mounting casting is bolted to the front of the engine. You can either remove the radiator and pump then remove the casting then engine or you can just unhook the oil lines and pull the engine and radator, casting, pump as one unit. Good luck!

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Phil - MO

09-24-2006 20:03:29

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Re: John Deere 450b dozer in reply to crotchrocket25, 09-24-2006 17:42:48

I think I just told you what little I know.
It's just that I had removed the nose several times and learned the hard way.
The previous poster jdemaris seems very knowledgeable. Maybe he'll answer your question.
He helped me with my slipping clutch problem.

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