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Case Tractors Discussion Forum
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Case D450 Transmission pump priming

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Wideglide

10-01-2007 18:54:40




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I have a problem with my Case D450 dozer.
It would run fine and sometimes loose all the transmission psi. I cleaned the strainer,filled the suction hose and now no pressure. I think the strainer has to be in to keep the oil in the line to the pump otherwise you loose the prime, right? I tried it without the strainer and loosened up the discharge hose and got lots of pressure. What is the correct way to prime the pump when installing the strainer?
Thanks

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Walt Davies

10-02-2007 07:53:43




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 Re: Case D450 Transmission pump priming in reply to Wideglide, 10-01-2007 18:54:40  
Your transmission pump is a positive displacement pump so it should pump air if everything is in good condition if you are losing prime then look for leaks in the pickup system or replace the pump as it is worn an won't prime itself.
We had a lot of trouble with the tranny pump on the Cat D7-F it would get a small amount of wear that was not noticeable but was enough that it would not pull the oil up from the tranny. the pump was on the back of the engine above the tranny not a good way to do it. You could pull the little 1/4 pipe plug on top of the pump and this would allow it to prime but that's a pain in the next after awhile. Funny story The Army kids brought a D7-F over that wouldn't move after putting in a new Tranny. I took the torque converter off and the found that they had not put the planetary gears back in. My boss insisted that they drove it into the shop up hill. I don't like to call people liars but that was imposable without those gears. Walt

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Wideglide

10-02-2007 09:05:15




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 Re: Case D450 Transmission pump priming in reply to Walt Davies, 10-02-2007 07:53:43  
Thanks Walt



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Walt Davies

10-02-2007 16:31:09




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 Re: Case D450 Transmission pump priming in reply to Wideglide, 10-02-2007 09:05:15  
No problemo.
Alway glad to help most people understand very little about pumps and the different types and which need to be primed and which don't.

Walt



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Wideglide

10-02-2007 18:56:15




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 Re: Case D450 Transmission pump priming in reply to Walt Davies, 10-02-2007 16:31:09  
Hello all, I got the pump primed and it is working fine now. I cracked open the discharge line from the pump,replaced the o-ring on the strainer cover,filled the suction line and then started the engine and put some air pressure into the tranny through the fill tube and as soon as I put the air to it I had fluid coming out the discharge fitting. I do this sometimes on my Allsis Chalmers D17 tractor to bleed the air out of the fuel system, works good and saves some time. Thanks to all for the help!!!
Another question. The tracks are out of adjustment and is it possible to take a link out? What is the best way to knock the master pin out? Should I use heat? The track and pins look pretty good and replacing the tracks is not an option at this time.
Thanks Mike

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george md

10-01-2007 20:02:08




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 Re: Case D450 Transmission pump priming in reply to Wideglide, 10-01-2007 18:54:40  
One note in addition to what mel has said, the
lining in the suction hose from the filter to the
pump will come loose and collapse . A suction leak or a bad pump shaft seal will usually give
trouble at start up , collapsing lining usually
causes trouble after you have been running a
short time .I put a pump shaft seal in one today,
seal lips were hard causing no pressure at start
up.

george

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mEl

10-01-2007 19:05:46




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 Re: Case D450 Transmission pump priming in reply to Wideglide, 10-01-2007 18:54:40  
Check your suction system for loose hose clamps at the nipple where the suction hose comes out of the tranny casting,i"ve seen a few of them bent from debris getting to them and causing an ail leak into the suction hose. Usually the pump can be bled by loosening the small hose on the charge pump and allowing oil to flow. In all likelyhood the pump is marginal and will need replaced. On one occasion I had a filter body loose on the nipple on the firewall. don"t waste your money trying to rebuild the charge pump, it is futile.

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Wideglide

10-01-2007 18:56:19




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 Re: Case D450 Transmission pump priming in reply to Wideglide, 10-01-2007 18:54:40  
The last post , its a 1970 model D450
Thanks Mike



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