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Lac qui Parle County Minnesota | I was planting with my tw15 a couple of weeks ago when I noticed a hot oil smell. I got of the cab and noticed that the auxiliary pump was smoking with hot hydraulic fluid seeping through the seems. I shut it down, but when I tried to drive it home (mile and a half) it really started blowing oil, to the point it dumped most of the hydraulic fluid before I could get home. I figured it was the pump and bought a new one through Worthington Ag parts. Finally got around to installing it today. Things seemed okay, but then the new pump started getting hot, too. Any ideas on the problem? I'm thinking there has to be a restriction or maybe a bad relief valve somewhere? |
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Mount Vernon, WA | Sounds like the new pump might not have primed itself. Did you fill the filter with oil before installing? If not, that might be it. Take the filter off and see if anything comes out. |
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Lac qui Parle County Minnesota | I did fill the pump with oil. With the side ways filter, it's hard and messy to fill it with oil.
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Winkler, Manitoba Canada | How did Ford plumb those tractors with gear pumps and closed centre valves? There must be some sort of provision to bypass the oil. Parts lists a remote control unload valve. |
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Lone Wolf, Ok | Under the seat on top of the topcover is the 'combining valve' -- there is a screen in the end of it -- check that -- this valve combines the flow from the main (belly) pump and the auxilialry pump to the remotes only -- new pump -- priming is a real pain -- sometimes a glob of very thin grease works best to prime -- don't specically recall where it gets it's oil from , but there may be a strainer in the sump.
Good Luck! |
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Sanilac Co. Michigan | WTW - 6/6/2014 20:09
How did Ford plumb those tractors with gear pumps and closed centre valves? There must be some sort of provision to bypass the oil. Parts lists a remote control unload valve.
I believe they're open center systems. |
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Mount Vernon, WA | It's a "hybrid" open center/closed center system. Since the term open and closed center usually refers to the style of control valves rather than the pump, it's more of a closed center system. However, it uses gear pumps, so there must be a way of dumping pump flow to sump when the valves are not demanding any oil.
The systems uses what I will call an unload valve to accomplish that. Closed center, load sensing valves tell the unload valve when to direct oil to the remote valves. |
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Leeds, North Dakota | http://www.tractordata.com/farm-tractors/000/7/2/722-ford-tw-15.htm... correct it is a closed center system, but as Bern said its a hybrid using gear pumps to achieve a closed center system, sounds like something is making pump stroke continuously, Bern do you agree, Scott. |
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Leeds, North Dakota | After looking at parts break down, didn't spend much time, change filters if pump failed, would suggest cutting them open, if you have changed them, cut old ones apart, need to look more closely at parts breakdown, This stupid system of want a be closed system can be interesting to trouble shoot, the thing that worrys me is both pumps are doing the same thing, don't run it or you will be buying another pump, need to put a flow rater on system and see what is actually happening, that's my gut feeling, Bern any comments? Scott. |
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Mount Vernon, WA | That tractor data site is wrong. Early TW tractors were pure open center.
Not sure what to make on this one. I would have to listen/touch/feel for myself before I made a guess. |
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Mount Vernon, WA | If you felt that the pump was running at high pressure all the time, a person could certainly tee in a pressure gauge easy enough. I doubt that's it though, as there is no relief valve in the pump to protect it if the flow was indeed blocked. |
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Lac qui Parle County Minnesota | I did replace all the filters and only ran the tractor for about 15 minutes but things started to get hot.
Could the problem be in the priority valve where the auxiliary pressure line comes in. Reading the repair manual, if I read it correctly, the oil is just dumped back into the rear end until it senses a load which moves a valve and uses the auxiliary pump pressure. Stuck valve in there? There has to be something restricting it, right?
I have to use the tractor for spraying which only uses the hydraulics for the booms. Can I get by for now with just removing the pump, putting on a cover, and plugging the suction and pressure lines dedicated for that pump?
Edited by Gromit 6/8/2014 00:57
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Leeds, North Dakota | Yes that should work, with it being a gear pump hyd flow is not returning, for what ever reason, will do some more research, Scott. |
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Lac qui Parle County Minnesota | Thanks Scott, you and Bern are the best!
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Ford tw15 auxilary hydraulic pump
