YM4220D Hydraulics/Steering Concern

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sburne10
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YM4220D Hydraulics/Steering Concern

Postby sburne10 » Wed Aug 05, 2020 12:26 pm

My dad passed along his old YM4220D. Unfortunately, it sat idle for approx. 7 years. We were able to get it running with little issues. However, the steering is extremely stiff and the bucket is unable to lift the tractor off the ground. My dad has suggested replacing the hyd filter & draining some of the oil. He lost the dipstick and suspects he overfilled the tank.

Any suggestions are greatly appreciated! Also, if anyone knows where to find a diagram of the hydraulic system that would be very helpful.

winston
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Re: YM4220D Hydraulics/Steering Concern

Postby winston » Wed Aug 05, 2020 1:46 pm

You have a big one there. Hoye shows this dip stick. https://www.hoyetractor.com/PROD/DS-3110.htm

You have an external spin on filter on your hydraulics https://www.hoyetractor.com/PROD/HF-1.htm as well as an internal strainer that will need to be cleaned. https://www.hoyetractor.com/PROD/194322-24910.htm

I expect you need to drain all the fluid and start with fresh. I believe your suction strainer is behind a flange located just below and to the right of the pto shaft.

I have no diagrams.

sburne10
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Re: YM4220D Hydraulics/Steering Concern

Postby sburne10 » Sun Aug 09, 2020 6:50 pm

Thank you!

What hydraulic oil is best to use? The ones listed in the manual I do have are no longer available.

winston
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Re: YM4220D Hydraulics/Steering Concern

Postby winston » Mon Aug 10, 2020 4:14 am

I personally used Tractor Supply's Traveler brand https://www.tractorsupply.com/tsc/produ ... ulic-fluid in my old 2002D and still am using it in a Bobcat CT235 hydrastat. I also used Walmarts Supertech brand. https://www.walmart.com/ip/Super-Tech-H ... SellerId=0

I am not saying those are the best but will say they work fine.

sburne10
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Re: YM4220D Hydraulics/Steering Concern

Postby sburne10 » Sun Oct 25, 2020 2:29 pm

I replaced the hydraulic screen, filter, and fluid. The front end loader & brush hog attachment raise but then begin to slowly lower on their own. The steering did not get any better. It is so difficult to turn the steering wheel... I broke it. :shock: Looking for some guidance if it is something related to the steering gearbox or hydraulic pump. I have ordered a new hydraulic pump and plan to replace it within the next week or so. Are there any how-to videos on replacing this pump? I also ordered the service & parts manual to help.

winston
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Re: YM4220D Hydraulics/Steering Concern

Postby winston » Mon Oct 26, 2020 4:46 am

Might read through this concerning your steering. https://www.tractorbynet.com/forums/yan ... ing-2.html

Any external leakage on your loader cylinders? If so that would by why it drops. If not, could be internal cylinder piston leak by or control valve leak by.

3 point lift dropping could be numerous things. I believe the most common is the lift piston o-ring leaking by. Might try raising lift with a load, then close your slow return or stop valve and see if the lift stays up or drops. If it still drops then likely your lift piston o-ring.

What made you believe your hydraulic pump was bad?

sburne10
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Re: YM4220D Hydraulics/Steering Concern

Postby sburne10 » Mon Oct 26, 2020 8:25 am

The front end loader is unable to lift the front tires off the ground.

I am not seeing any leaks anywhere on the tractor, and the oil level does not seem to be falling.

winston
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Re: YM4220D Hydraulics/Steering Concern

Postby winston » Mon Oct 26, 2020 8:54 am

when you raise the bucket, kill the tractor, how fast does it leak down?

sburne10
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Re: YM4220D Hydraulics/Steering Concern

Postby sburne10 » Mon Oct 26, 2020 9:18 am

Very slowly. Maybe 2in/min

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Re: YM4220D Hydraulics/Steering Concern

Postby sburne10 » Mon Oct 26, 2020 11:06 am

If its not the hydraulics, what do you suspect to be causing the steering stiffness? I can't seem to find any parts related to the gearbox or steering column.

sburne10
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Re: YM4220D Hydraulics/Steering Concern

Postby sburne10 » Mon Oct 26, 2020 11:14 am

On a separate (i think) issue, I have a lot of trouble getting the lower gear shifter to change gears. This is the one on the floor by the oil tank.

winston
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Re: YM4220D Hydraulics/Steering Concern

Postby winston » Mon Oct 26, 2020 12:23 pm

sburne10 wrote:If its not the hydraulics, what do you suspect to be causing the steering stiffness? I can't seem to find any parts related to the gearbox or steering column.


It could be the hydraulic pressure on all fronts; steering and both lifts. I can't know from my view point. Does the 3 point raise a heavy load? If you have already ordered a pump then I guess changing it will tell the tale.

I can only assume your steering is similar to what I had on my old 2002D. There are pictures on it on page one of the TBN thread I attached in my last post. You also likely have a diverter valve like the one shown in the attached picture. It allows a certain amount of hydraulic flow to go to steering and the rest on to the regular hydraulics. Yours may or may not look similar. I am sort of in the dark. Curious where are you located?
Attachments
diverter.jpg
diverter.jpg (99.21 KiB) Viewed 819 times

sburne10
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Re: YM4220D Hydraulics/Steering Concern

Postby sburne10 » Mon Oct 26, 2020 12:29 pm

I am located in southern South Carolina. I can take some pictures if that will help. Is there another way to contact you other than this forum?

winston
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Re: YM4220D Hydraulics/Steering Concern

Postby winston » Mon Oct 26, 2020 12:41 pm

sburne10 wrote:I am located in southern South Carolina. I can take some pictures if that will help. Is there another way to contact you other than this forum?

Aaron and others have much more knowledge on these Yanmars than I do. I have absolutely no information concerning your 4220D. The manuals you ordered should be a great help to you. Not sure what repair manual you will receive but am curious. Was hoping you were close but I can't drive from Northeast Texas to southern South Carolina. :mrgreen:
Last edited by winston on Mon Oct 26, 2020 2:55 pm, edited 1 time in total.

sburne10
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Re: YM4220D Hydraulics/Steering Concern

Postby sburne10 » Mon Oct 26, 2020 1:06 pm

Well any knowledge is more than I have. :D I just sent you an e-mail.


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