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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Case 450 Dozer - Sometimes doesn't move

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Dennis Kropp

11-05-2005 04:27:39

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I have a case 450 bulldozer made in the mid to late 60's. I did not have any problems with it moving until I got it on a pretty steep bank. Now every so often it doesn't want to move. It seems as though the transmission fluid is low, like in an automatic car. Is this possible, is this how the transmission on these works? If so where do I fill it and with what oil?

Thanks so much

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John Van Valkenburgh

11-05-2005 20:29:49

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 Re: Case 450 Dozer - Sometimes doesn't move in reply to Dennis Kropp, 11-05-2005 04:27:39  

Your 450 Dozer is essentially the same as my 450 Loader. There are two hydraulic "systems" on this beast. The first system deals with hydraulics to the blade cylinders, or what I like to call the accessory hydraulics. The tank for this hydraulic fluid sits behind the seat and is part of the fuel tank assy. Looking at the back of the machine, the dip stick/filler is on top of the tank to your right.

The accessory hydraulics have a filter that is accessable behind a panel on the right hand side next to the seat. Looking at the right side of the machine, the panel panel is opened from the outside. Basically its the compartment opposite of the battery compartment.

The pump for the accessory hydraulics is located in front of the engine right under the radiator. It bolts to a coupling that connects right to the crank.

Now the other hydraulic system runs the drive. The dip stick for this system is located right under the operators seat. Looking at the right side of the engine you will see a large 2" hose that runs from the screen filter assy to the charge pump. The screen filter assy is bolted to the firewall and it contains, you guessed it, a filter screen. The hydraulic fluid is drawn up from the resovoir under the seat, and through this filter. The other end of the big hose goes to the "charge pump" which is located on the engine right under the generator. The charge pump provides pressure to the torque converter.

Marlowe mentioned the final drives. There are two. Looking at the back of the machine you will see them on the left and right just inside the tracks. They are simply gear housings. About halfway up on the back of these housings is a plug where you fill them. Somewhere towards the bottom of the gear housings I think there is a drain. The finals do NOT take hydraulic fluid, they take gear oil just like the rear differential in a car.

Now, what oil do you use? Marlowe is right, use TCH in both hydraulic systems. This is especially important in the drive system. TCH is available from Case. I don't think its the same thing as HyGuard, and its certainly not the same thing as regular hydraulic fluid that you might get from NAPA. My Case dealer sells something I think is called Hy-Tran which is suppossed to be a subsitiute for TCH, however, I've got a really good parts man at my Case dealer who told me that Case was recommending substituting Hy-Tran for TCH but changed their minds. They now recommend TCH again, especially for the drive hydraulics. I ended up with Hy-Tran in the accessory hydraulics and TCH in the drive on my machine.

One leading cause of lack of motive power is either low drive hydraulic fluid or a clogged screen filter. If you have not done so you really should change out all fluids and filters. At the same time crawl underneath and look for weak or mushy hoses that should be replaced. It ain't cheap to do this but its certainly worthwhile as dirty hydraulics will certainly ruin something much more expensive.

If you don't have it, now is a good time to at least get the operators manual for your machine. I have found this book to be pretty good for telling you what you need to do. I also recommend the factory service manual and parts manual. The service manual is pretty expensive (like $150 used and over $200 new). If you are going to do your own routine maintenence I'd recommend the service manual. I think the parts manual is not too pricy and its good at showing you exploded views of how things go together.

Another maintenence item to check is the oil in the front idler wheels. These often go unattended until too late. The front idler wheels will have a little screw plug that you take out to fill them. I believe they take 30 wt. motor oil.

Thats a start. Drop me a line if I can answer any questions for you. The 450 is a great little machine.

1968 Case 450

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dennis kropp

11-07-2005 06:07:46

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 Re: Case 450 Dozer - Sometimes doesn't move in reply to John Van Valkenburgh, 11-05-2005 20:29:49  
Thanks so much John and Marlowe, that was very helpful.


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Robert in W. Mi.

11-06-2005 18:05:31

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 Re: Case 450 Dozer - Sometimes doesn't move in reply to John Van Valkenburgh, 11-05-2005 20:29:49  
"Now" Hytran "Ultra" has TCH in it, they are the same fluid. Case construction still gets the TCH label, but it's still Hytran Ultra in the container.

All Hytran from Case is now Hytran Ultra and can be used where TCH is needed.


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John Van Valkenburgh

11-07-2005 04:30:55

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 Re: Case 450 Dozer - Sometimes doesn't move in reply to Robert in W. Mi., 11-06-2005 18:05:31  

Thanks for the information. Thats a good thing to know. I have not been over to the Case dealer since last fall or so. Unfortunately my 450 is sitting waiting for me to get building. Least it will be ready when I do.

1968 Case 450

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11-05-2005 11:16:24

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 Re: Case 450 Dozer - Sometimes doesn't move in reply to Dennis Kropp, 11-05-2005 04:27:39  
did't you ever check or change it??? the dip stick is under the set. takes TCH fluid from case and use ONLY TCH. change the stuff once and do the filters also. do the planateries once they take 80-90 wt.i might some pissed but it kills me when people don't take care of stuff

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dennis kropp

11-05-2005 19:01:53

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 Re: Case 450 Dozer - Sometimes doesn't move in reply to marlowe, 11-05-2005 11:16:24  
I just got the machine. I found the dipstick earlier and it is low. I called my local dozer shop (I do not have a Case dealer near me) and he said to use Hi- Guard hydralic transmission fluid, but he was closing and said to go to NAPA and get their hydralic transmission fluid and that would be the same. Where is the transmission filter? I want to change this also. You mentioned doing the planetaries. What are they and where do I find them? I know what you mean about people not taking care of things. The last guy removed the serial number tag from the dozer so I have no idea what it is. Thanks for all the help,

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11-05-2005 19:51:38

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 Re: Case 450 Dozer - Sometimes doesn't move in reply to dennis kropp, 11-05-2005 19:01:53  
DO NOT use any thing other then TCH or a spec. oil that will match TCH or you will be sorry. hi- guard DOSE not match TCH. filter? all depends on ser. no. . the planetaries drive the tracks they are on the inside of the tracks in the rear fill to fill plug

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