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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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4-150 hydraulics-again!

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Dan-IA

05-08-2006 19:22:18




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Is anyone else tiring of this topic? I know I am!

From the pump the output goes to the valve assembly below that. One says "reducing v", one says "relief v" and there's 2 valves directly above the words "reducing v". From one of these comes a hose which goes to a steel pipe in a U shape around the top of the rear-end, which in turn connects to the valves on the rear-right side that control the remotes. We get almost no output at this hose immediately behind the valve assembly (a few drops.) Without a book I can't be sure, but I rather expected to see a gallon of oil come out here in about 20 seconds--just like from the oil-cooler lines.

At this point, it sounds like the 4 local mechanics are too busy or not interested in working on it, so I'm about to park it and wait for a book. In the interim, I'm tempted to pull the pump and cart it off to Fort Dodge to have it checked by the hydraulics shop over there. It's a long haul, but if we get some rain tonight I probably won't be planting beans anyway.

Tried the tractor-on, half-turn the screw on the pressure compensator. Made no difference at all. Had the filter off, and the check valve functions freely. The hoses look good on the inside. Someone suggested there's a second hydraulic pump on this tractor. If there is, I can't find it. We get good flow to the oil coolers up front, but with no way to check oil pressure, I can't rule out a pump problem or properly blame the valve arrangement below the pump. I've had all 3 valves out of that assembly, it all looks clean and everything seems to move just fine. I haven't had the valve assembly nor the pump removed from the tractor though. Local mechanic says I can't get another pump like that, so I'm hoping there isn't a problem with it...

All I know is that, if I knew it was gonna be this way, I'd have just let that bloody hose drip!

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ToddV8

05-09-2006 04:21:02




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 Re: 4-150 hydraulics-again! in reply to Dan-IA, 05-08-2006 19:22:18  
I once fought one of these set ups, had just installed a rebuilt pump. Started up and had no pressure. Turned out I made a fitting on the outlet side of the pump reduced down directly to a 5000psi pressure guage. Pump was making the full 2000psi. So naturally I plumbed back the outlet hose and found just like I had before no pressure upon start up. Then I went to thinking, upon start up use your ears and hands to feel where the oil is buzzing. There ended up being a piece of metal stuck in the initial start up by-pass valve. Think of it like a velocity check valve on an NH3 or propane tank, it is supposed to flop shutt upon a ruptured hose, same thing here applies, to enable tractor to start easier oil isn't compressed to full pressure (it would make it harder for the starter to turn over) Upon start up and some level of flow... spring loaded check closes.

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J Schwiebert

05-09-2006 02:05:52




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 Re: 4-150 hydraulics-again! in reply to Dan-IA, 05-08-2006 19:22:18  
The oil first goes to the steering. The steering has prority. Do you have oil going to the power steering. Did you remove the 3/8 inch line form the pump and plug it so the reservoir does not drain. Then you need to fab a 3/8 line and attach it to the fitting you removed the other line from. Start the tractor and run it at rated RPM for a minute, you must time it. How much oil is in the container. Also did you check the unloader valve. It has to unload full pump out put so the starter can turn it over.

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davpal

05-08-2006 23:07:45




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 Re: 4-150 hydraulics-again! in reply to Dan-IA, 05-08-2006 19:22:18  
I think your mechanic neighbor is blowing smoke up your arse! There are probably a million pumps like that all over the world. Go to yahoo and type in "Vickers PVB15 Pump" in the search bar and you will get several companies that specialize in these types of pumps. Two that look pretty knowledgeable are Knight Hawk Supply Company and another called Parts For Pumps. I think either one of these places could probably tell you more in five minutes than you can figure out in a long time. My 4-150 has a new pump on it. They are not that hard to come by. You could probably even upgrade it to a pump with more gallons per minute. I am sure they could tell you. There is also quite a few items on ebay for Vickers pumps. Just out of curiosity, how does the hi-low powershift work on your 4-150? I may have to do some work on mine. Seems to be slipping, either that or the clutch itself. I never cared much for powershifs on big tractors. Seems to be the archillees heel on just about every big tractor made. I would rather just have a 6 speed with a straight shaft in there I guess. Always something. Curious, Do you plant with this tractor?

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