450c wants to turn right...

Cuzz · Post by **Cuzz** » Sun Jan 18, 2015 5:02 pm

1974 450c dozer

After about 40-50ft going forward, it slowly starts turning right. Back up a couple feet and go forward another 40 feet and it does the same thing. Any ideas on what is causing this? Thanks...

DrLoch · Post by **DrLoch** » Mon Jan 19, 2015 7:49 am

What happens if you pull left handle? Not far enough to apply the brake just enough to release the left clutch.

Stan Disbrow · Post by **Stan Disbrow** » Mon Jan 19, 2015 7:57 am

Hi,

Sounds like you lost drive on the right side steering clutch. The track is moving, but the ground makes that happen, so the drag causes a slow steer to the right. If so, then pulling the left lever ought to stop the machine if the clutch is gone, or slow it way down if the right clutch is slipping.

You can also try the 'stick the blade or bucket against a big tree and see if the tracks spin' trick.

Stan

Cuzz · Post by **Cuzz** » Mon Jan 19, 2015 9:07 pm

I just bought this machine. It belonged to a local county school board. On the last day before retirement, 2 mechanics replaced the right side clutches and left before even checking to see if it was working. After finding out later that it didn't work, the county auctioned it off. Now I have it.

Blocking both tracks off the ground, both tracks will start turning when you first put it in gear. After they turn over about twice, the right one stops. Left is fine. I'm wondering what these two mechanics did wrong to cause the machine to act this way.

jtrichard · Post by **jtrichard** » Mon Jan 19, 2015 10:27 pm

The Cs are hydraulically applied clutches sounds like you are losing all apply pressure to the right clutch question is WHY?

Cuzz · Post by **Cuzz** » Tue Jan 20, 2015 10:44 pm

I'm having the machine brought in on a roll back in the morning. I guess removing the final drive is my first order of business?

Stan Disbrow · Post by **Stan Disbrow** » Wed Jan 21, 2015 8:28 am

Hi,

I would check the hydraulics on the bad side first. The hyd pressure pushes the clutch to engage drive, so if you lose that the clutch disengages and loses drive.

Much easier to mess with that than pull it all apart to find out it was a hyd pressure issue....

Stan

Cuzz · Post by **Cuzz** » Wed Jan 21, 2015 6:46 pm

Got the machine home today. Not only the right side clutches not working but neither does the right brake...

Cuzz · Post by **Cuzz** » Wed Jan 21, 2015 6:52 pm

BTW...thanks to all for the ideas and help..

Stan, I'm getting hyd pressure to the left side clutch as it is pulling good. I buried the blade and left side digs in good. Also, left brake works well. Right clutches and brake not working on right.

Also, serial #201xxx so its a 1974. First year for 450c I guess??? So it is an early one.

DrLoch · Post by **DrLoch** » Thu Jan 22, 2015 8:02 am

Look under the seat to make sure everything is connected correctly.

MarkW · Post by **MarkW** » Fri Jan 23, 2015 9:51 am

On the last day before retirement, 2 mechanics replaced the right side clutches and left before even checking to see if it was working.

There might be a clue there the problem was misdiagnosed from the start.

As suggested, I'd check the work to see if it was all done properly but there is a possibility the problem exists upstream of where the work was done. Good luck! These things can be frustrating but they do feel good when you get a bargain that turned out to be caused by a pea sized blob of sealant somewhere.

Cuzz · Post by **Cuzz** » Sat Jan 24, 2015 7:39 pm

Snow is flying so I put it in a warm garage.

Talked to a local service manager that is supposed to be a whiz on the older
machines. He also thinks it is something simple that is the problem. From
just running enough to get into the garage, it has filled the final drive to
overfull. Local guy seems to think the set screw may have not been set and the brake drum may have cut the rubber hose to the clutches, hence pumping a lot of oil.

Question: Do I have to pull the final drive housing to replace the intermediate shaft oil seal?

jtrichard · Post by **jtrichard** » Sat Jan 24, 2015 7:48 pm

HAS over filled the FINAL? or the CLUTCH HOUSING???

Cuzz · Post by **Cuzz** » Sat Jan 24, 2015 8:22 pm

Wrong plug maybe. I think it is the clutch.

jtrichard · Post by **jtrichard** » Sat Jan 24, 2015 8:35 pm

bad hose or clutch seal.... should NOT have to pull the final to fix that

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450c wants to turn right...

450c wants to turn right...

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