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 | Jerod
Join Date: Posts: 1 
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2003-02-22 49786
Ok,
I bought a used 7200 HST here in Ca for my grandpa, I get it home and get no more than 30min into it and OIL starts BLOWING out from the tube thats off the top on the valve cover. Then the hydralulics fail. I check the fluid, refill, then it starts blowing more out. Does this sound familiar to anyone ? Or have any ideas ? I am SO lost.
All help is greatly appreciated.
Jerod
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2003-02-23 49806
That doesn't sound good, but with any luck what you have may be a clogged hydraulic filter and maybe an obstructed crankcase breather.
I don't know where the tractor came from or if you know its history. Many used tractors have sat for a long while before an owner decides to sell them, or they just stop doing maintenance. It's good to start by changing all fluid and filters on any used tractor.
Excessive or wrong viscosity oil or a blocked breather might account for the oil blowing. I'd change the oil and filter, and I might add an oil additive (Marvel's Mystery Oil gets some favourable comments) if the tractor sat for a long while.
If it continues to blow, I'd remove the oil filer cap, start the tractor and see what comes out the fill hole. A lot of exhaust smoke may indicate a problem but even then an oil additive might eventually fix it. When changing the engine oil, I'd look for any evidence of coolant in the oil and notice if there's anything like steam in the exhaust when it's running. On general principal, I'd take off the rad cap and look for bubbles in the coolant while the tractor is running.
Removing the filler cap should cure the oil blowing but then question is why is pressure building up in the crankcase. A blocked breather is one answer and of course there are more serious answers as well. Many breathers are a simple open tube extending down from the side of the engine and I'd make sure that it's open.
With any luck, this stuff will fix it up. If it does, I'd monitor the engine, hydraulic and coolant levels closely for awhile and pay particular attention to any that seem to increase.
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| Jerod ~ California
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2003-02-23 49825
I took your advise and pulled the Oil fill cap off to watch for what is happening, No coolant levels dropping, no signs of bubbles in the oil, It actually looks like it is thinner the oil that is. Like maybe the hydraulics are draining into the oil pan, which over fills it then blows through the breather. But now what do I do ? Take it to a dealer ? I have more than enough tools, but my knowledge of Diesels are limited. Any ideas on what parts could be causing this, hell I would snowball it if I had some clues.
Thanks
Jerod ....
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| dcsmith01
Join Date: Jul 2003 Posts: 25 ohio
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2003-02-23 49833
Go talk to the dealer first. Sometimes they can be very helpfull. Ask them anything, talk to their mechanics. If it is something routine maybe they can help, if not then you know where to go. Good luck ....
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 | WillieH
Join Date: Feb 2003 Posts: 543 New England 
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2003-02-23 49835
Jerod...
Your B7200HSD has a not uncommon problem. What you are experiencing is, basically, your tractor is making oil ! Congratulations, You'll soon be a very wealthy man! Seriously, though, the problem that you described is common, especially on older units. What is happening is that your hydraulic pump / pump seals are worn out enough to cause a bypass or flow- by from the hydraulic chamber to the crankcase. You witnessed your crankcase oil getting "thinner", well this is indicative of hot hydraulic oil. As it heats up, it changes its viscosit( its Thickness ), then if mixed with engine oil, it will thin down your engine oil. Small matter really to correct. Simply purchase if not under any type of warranty, a hydraulic pump seal kit from your local reputable Orange dealer. Try this first, before you sink money into a pump. You may just find as you dissect this puppy that all you need is a seal. If that is not sufficient, then the pump needs renewing. Your air tube blasting out oil is doing exactly what it was intended to do. It is analagous to your PCV valve on your car. It allows a release of excess (whatever) from your engine . In this case, too much oil, so it needs to breath. Be sure to drain out your crank oil before running for a long period of time after you repair your hydraulic seals /pump. Keep us posted. ....
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| Jerod
Join Date: Posts: 1
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2003-02-23 49856
Great advise,
I will tear into it Monday and see about ordering seals, from TractorSmart.com I will do that in the morning as well.
I will indeed keep you posted !!
Making oil...I like the sound of that. Just not the idea.
Jerod ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2003-02-24 49881
I think that Willie's explanation is a good bet, and that's what I was thinking when I said that fluid levels should be monitored.
I do think it would be good to make sure that the engine oil is thinning and the level is increasing before tearing into the injector pump. Besides, it might be good to slow down and learn more about diesels if you're planning on tackling the repair yourself. There's some stuff that should be known. For example, injector lines can contain fuel under pressure high enough to seriously injure yourself even when the tractor is off. I don't know how the 7200 pump mounts, but on many the pump timing should be checked after removing a pump. Index marks are sometimes scribed so the pump can be remounted in the same position. It would be good to learn the basics and to get a repair manual and follow the procedures.
If the tractor came from a dealer, it does sound like it was sold without being serviced (especially if the hydraulic filter proves to be clogged). I don't know how common that would be but I wouldn't expect it from any dealer in my experience. If the hydraulics work for some minutes when the tractor is first started and then stops, a clogged filter is very likely. It's not good to run a tractor for long in such a condition. It's also good to recognize the sound of an open relief valve and make sure it's not open all the time.
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| Jerod
Join Date: Posts: 1
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2003-02-27 50212
UPDATE !!!
Thanks Guys for your help, the Pump was bad, just replaced it with new Kubota part now theres no more oil spewing.
Thanks
Jerod ....
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