Go BottomYanmar 1600 Hydraulics not working
 | jmidol
Join Date: Jul 2003 Posts: 7 North Carolina 
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2003-05-27 55735
I have a Yanmar 1600 and the hydraulics quit working. The pump started making a whinning noise and now the lift want work. Also is the rear end fluid the same fluid that the hydraulic pump uses? What kind of fluid would I need?
Thanks
Mike
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2003-05-27 55755
I'll let somebody who knows Yanmars make the oil call. Most compact tractors have a single case for transmission, differential and hydraulic reservoir. For most tractors it's all from the same place and for many tractors most any oil sold as transmission/hydraulic oil works. There are issues of petro vs synthetic and winter vs summer blends though. I'm not aware of any compact that requires a special oil like the automotive F-type automatic transmission fluid issue but somebody who knows Yanmars could say.
A whining sound often is the pressure relief valve rather than the pump. The relief opens to relieve high pressures that can result from heavy loads, obstructed or disconnected lines. If the tractor has a loader, on many hookups, the lift won't work if a loader valve is open or the inlet or outlet are disconnected. If the tractor doesn't have a loader, changing the position of a diverter valve from the remote to auxiliary position will open the relief.
It may not be the relief, but if it is, it's not good to run a tractor for long in that condition. The oil will over-heat and damage the pump.
A pump can whine as a result of failing bearings etc. but I don't believe it's that all that common. A more common pump problem is cavitation from an obstructed, broken suction line or clogged filter. The sound usually is more of a rattle or buz. The lift on a tractor with a clogged filter usually works for a while, the power deteriorates and then it quits until it sits for awhile. It might be good to change the filter on general principal. It's also important to cure this type problem before running a tractor much.
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2003-05-28 55795
I think Tom is on the right track, a whine in the hydraulic system is usually the pressure relief valve cycling very rapidly.
If that was the case then it may have been caused by spring failure, the whine was caused by the valve as it failed, the total loss of hydraulic power would be because the relief valve is now open and the fluid gets dumped directly back to the reservoir by the open valve.
Diagnosis could be fairly straight forward if there is access to the relief valve.
Best of luck. ....
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| flealine
Join Date: Posts: 1
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2003-05-28 55827
Ref:Yanmar problem is common to smaller Yanmar tractors. It is a sticking valve in the control located under the seat. A temporary solution is to take the valve apart and slightly sand the plunger. Yanmar sent a factory rep to my home many years ago when I was having the same problem. (Under weight the lift stops or freezes up and will not work, but makes a hissing sound, as if it is trying to work) If this is the case the solution is what I told you. You will have to replace the valve, but the method I gave you might get you by for a while. I replaced at least three valves. Good luck. flealine ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2003-05-29 55852
Sounds like Flea has some pretty good experience here. I wonder if a 1600 has a typical position control 3ph or not? Repair of a position control 3ph would best done with a repair manual available since there are a fair number of valves and components. I'd also emphasize the comment of 'slightly sanding' if a spool valve is involved. Spools are lapped into their barrels to close tolerance and taking much off a spool would leave it incapable of withstanding much pressure. Spools do become scored and can stick.
I also wonder what type flow control valve a 1600 has? The flow control could be the plunger Flea mentioned. Typical flow control valves do not obstruct inlet passages to the lift cylinder. They adjust the speed a hitch lowers but leave the lift speed unaffected. A hitch can't lower if the valve is closed but it still can lift. Other types of flow valves may affect the inlet passage and would be a candidate for the problem described.
I also wonder if the hitch is fully raised? Position control 3ph's in proper adjustment return to neutral mode before the physical limit of the hitch is reached. A 3ph that's out of adjustment can go to full height and remain in lift mode. If the flow control was closed, it would be stuck in lift mode and the relief valve would open.
I think it's important to figure out where the whining is coming from, where the system relief valve is (it there is one in addition to one that's normally in the 3ph) and exactly how the hitch isn't working. The whining could be hydraulic noise due to fluid flow through a small orifice, but it's important to know if the tractor has a relief valve that's open.
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| jmidol
Join Date: Jul 2003 Posts: 7 North Carolina
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2003-05-29 55872
Thanks for all of the advice.
Mike Idol ....
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 | lsheaffer
Join Date: Jun 1999 Posts: 1082 Northern Illinois 
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2003-06-01 56142
Usually the pump whines because it is starved. If you haven't cleaned the pickup screen , I'd recommend it. It is the easiest & cheapest thing to do. Use a Universal hydraulic/transmission fluid = > to JD303. ....
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| RadioOne
Join Date: Jul 2003 Posts: 5 Locust, NC
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2003-07-19 59791
I had a similar problem with my 1510. On three seperate occaisions the 3PH either got stuck up or down. All three times it was a sheared off roll pin from the control arm to the valve. After the third time I finally spoke with someone over at Corriher Implement Company, and he told me that instead of putting in a single roll pin to replace the sheared off one I needed to double it up. So I put in the same size roll pin that I had been using earlier, and then tapped into the center of that one a smaller roll pin. Don't know if this was the best solution out there, but it hasn't given up yet. ....
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