YM186D with YFL650 FEL not lifting a load after one hour use

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ctrobinsonaz
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YM186 loader won't lift when hot

Postby ctrobinsonaz » Mon Jun 08, 2020 10:38 pm

My YM186D tractor with a YFL650 FEL lift capability deteriorates as the tractor is used. The tractor lifts as expected early morning but after about 45 minutes it begins to struggle lifting a loader 1/2 full of dirt. After about an hour it cannot get a 1/3 loader of dirt lifted 3 feet. I also notice it is difficult to shift gears. I have changed the hydraulic fluid (replaced with JD303) and filter with no improvement. The drained fluid did not appear excessively dirty or cloudy. Do I have a hydraulic pump going bad or could it be another issue?

ctrobinsonaz
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YM186D with YFL650 FEL not lifting a load after one hour use

Postby ctrobinsonaz » Tue Jun 09, 2020 12:34 pm

I have an YM186D with a YFL650 loader and it lifts a full bucket of dirt easily when first used in the morning. After about 45 minutes it can only lift about 2/3 bucket and after an hour it won't lift 1/3 bucket. After letting it cool down it works better, but not as good as first thing in the morning and only lasts about 45 minutes. I changed the hydraulic fluid (JD303) and filter and there was not change to the symptoms. Does this indicated I need a new hydraulic pump? Or could there be other sources to the problem.

winston
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Re: YM186D with YFL650 FEL not lifting a load after one hour use

Postby winston » Wed Jun 10, 2020 5:35 pm

Did you clean your suction strainer? #30 here
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https://www.hoyetractor.com/PROD/194300-24700.htm

That is behind a 3 bolt flange, right side (sitting in seat), up high on the transmission.

ctrobinsonaz
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Re: YM186D with YFL650 FEL not lifting a load after one hour use

Postby ctrobinsonaz » Thu Jun 11, 2020 7:14 pm

Is the suction strainer the same as the transmission oil filter (suction screen)?

ctrobinsonaz
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Re: YM186D with YFL650 FEL not lifting a load after one hour use

Postby ctrobinsonaz » Thu Jun 11, 2020 10:06 pm

This is from the YM186 owners manual. I was in the process of taking the cover off to change the tranmission filter when the corner of the cover broke off. I didn't go any further till I could purchase a new cover so I could continue to use the tractor.

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winston
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Re: YM186D with YFL650 FEL not lifting a load after one hour use

Postby winston » Fri Jun 12, 2020 4:05 am

The four bolt flange shown in your attachment is the other side of the 3 bolt flange I spoke of. Evidently my mistake thinking it came out on the left hand side. I find it interesting their description states it is at the bottom of the transmission case. Is that out of a 186 operational manual?

ctrobinsonaz
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Re: YM186D with YFL650 FEL not lifting a load after one hour use

Postby ctrobinsonaz » Fri Jun 12, 2020 8:01 am

It's from the "Yanmar Diesel Tractor Operation Manual" for the YM186/YM186D. I would say it's near the top of the transmission case.

ctrobinsonaz
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Re: YM186D with YFL650 FEL not lifting a load after one hour use

Postby ctrobinsonaz » Mon Jun 15, 2020 10:33 am

I have ordered a new cover and will clean the screen after I receive it. I'll update the post with status when done.

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Re: YM186D with YFL650 FEL not lifting a load after one hour use

Postby ctrobinsonaz » Sat Jun 27, 2020 2:48 pm

I received my replacement cover and removed the screen. As can be seen in the pic it was not very dirty. I did find some metal pieces when I cleaned the cavity. I blew out the screen and reinstalled the screen and cover. No change in operation.

Are there other parts that should be assessed or does this indicate a hydraulic pump issue?

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winston
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Re: YM186D with YFL650 FEL not lifting a load after one hour use

Postby winston » Sun Jun 28, 2020 5:38 am

You may not have a way to check fluid temperature but wondering, do you think the transmission could be over heating? With both the main hydraulic and the power shift hydraulic problems it would not seem likely your main pump is bad. The power shift has it's own pump.

ctrobinsonaz
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Re: YM186D with YFL650 FEL not lifting a load after one hour use

Postby ctrobinsonaz » Sun Jun 28, 2020 8:19 am

I do not have a gauge, but the transmission does not feel hot to the touch. Is there a better way to check? I did not see a hydraulic temp gauge set on hoye tractor.

Any concern about the metal fragments?

winston
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Re: YM186D with YFL650 FEL not lifting a load after one hour use

Postby winston » Sun Jun 28, 2020 8:40 am

If it does not feel hot to the touch it is not overheating. Metal fragments cannot be good but if they are not recognizable then it is impossible to know where to look.

Can you elaborate a little more on the hard shifting? Like gears grinding or just what?

what about your 3 point lift, does it lift with normal power?

ctrobinsonaz
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Re: YM186D with YFL650 FEL not lifting a load after one hour use

Postby ctrobinsonaz » Sun Jun 28, 2020 7:27 pm

The PowerShift works fine even when hot. When using the clutch to change the range (not PowerShift) it sometimes grinds getting it into gear.

I haven't lifted a lot on the 3 point (~400 lbs) , but it lifts lift that fine when hot.

winston
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Re: YM186D with YFL650 FEL not lifting a load after one hour use

Postby winston » Mon Jun 29, 2020 4:54 am

Your first post says "also difficult to shift gears". If that difficulty is the grinding when shifting range gears then you might want to make sure your clutch linkage is properly adjusted. Also, a complete stop is required for range shifting.

"If" the 3 point is operating normally that would lead me to believe your hydraulic pump is working normally. That would indicate a problem with the loader. Does your loader leak down, curl or lift, when tractor is not running?

You may have to come up with a way to test your system pressure.

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Re: YM186D with YFL650 FEL not lifting a load after one hour use

Postby NHyanmar186 » Wed Jul 01, 2020 4:31 am

I have the same tractor and oem loader as you do. Mine has a separate hydraulic pump exclusively for the loader, that is driven off of the front crankshaft pulley, near the radiator. The loader arm tower on the exhaust side of the tractor, is the hydraulic fluid reservoir for the FEL. You have to remove the black vent cap on top of the loader tower, in order to add hydraulic fluid to within 2 inches of the top of the res. At the very bottom of that tower, the hydraulic pump inlet supply line hose connects to a barbed fitting. That fitting threads into what looks like a steel bushing, which then threads into the tower body itself. If you unscrew that "bushing" piece completely, you will see that it has a metal strainer attached to it. I changed my FEL hydraulic fluid once, and that strainer was pretty dirty. You can also manually pump out a small amount of old fluid that is trapped inside the tower res., below the level of that strainer. None of this applies if your FEL uses the Yanmar 3PT. hydraulic system to provide hydraulic pressure...but I thought that all US Yanmar 186s had a separate, secondary pump driven off of the crankshaft, pto style? Perhaps that front mounted hydraulic pump is tired?


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