Yanmar SA424 loader hydraulic lift

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tractorbob
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Yanmar SA424 loader hydraulic lift

Postby tractorbob » Wed Aug 19, 2020 5:49 pm

Hello all,
Rather still a new member, so I do hope this is in the right section. I had noticed my Yanmar SA424 loader bleed off after a while, so I wanted to confirm. At 1600lbs load, the bucket begins to drop pressure at a rate of roughly 10lbs of load per sec. I realize this may be in overload state, so I dropped the load to 800lbs, and the bucket will still "bleed off", or lose load pressure at a rate of perhaps 30lbs/min.
I am trying to determine what needs to be looked at/replaced. Do I just require new hydraulic cylinder seals? Is there something else I'm not even aware of? Nothing leaks externally, and I only noticed this issue when I would park the tractor with the bucket flat, only to return 3 days later and find the front of the bucket pitched up, and visually confirmed it when testing max loads watching the scale. Thank you for any information.

winston
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Re: Yanmar SA424 loader hydraulic lift

Postby winston » Wed Aug 19, 2020 6:08 pm

Pretty sure you are welcome here. This sight deals more with the older Yanmars so only speaking for myself. I am old and slow so humor me. I am not fully understanding which cylinders might be leaking. Lift cylinders or curl cylinders. Which ever, it would sound like fluid is leaking by the piston inside a cylinder. Unless it is causing problems I would probably ignore it.

Out of curiosity, does did your tractor come with a pressure gauge on it?

Aaron
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Re: Yanmar SA424 loader hydraulic lift

Postby Aaron » Thu Aug 20, 2020 10:30 am

Is the loader actually lowering or are you just wondering why there is a pressure drop? It is normal for a loader to slowly lower over time. Unless it causes problems in a normal work situation or leaks externally- I don't ever worry about it.

tractorbob
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Re: Yanmar SA424 loader hydraulic lift

Postby tractorbob » Thu Aug 20, 2020 12:26 pm

Aaron wrote:Is the loader actually lowering or are you just wondering why there is a pressure drop? It is normal for a loader to slowly lower over time. Unless it causes problems in a normal work situation or leaks externally- I don't ever worry about it.


Thank you both! I will just leave it be then. I was referring to the lift cylinders, and not the curl. Was more curious about the pressure drop; it does not cause any issues.
I was just testing the maximum lift load capacity with my crane scale, and only noticed when I saw the numbers dropping off. I thought it would hold any weight steady, but day to day it is not noticable. Again, thanks so much. :D

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tractorbob
Volunteer Poster
Posts: 6
Joined: Wed May 20, 2020 7:55 pm

Re: Yanmar SA424 loader hydraulic lift

Postby tractorbob » Thu Aug 20, 2020 12:37 pm

winston wrote:Pretty sure you are welcome here. This sight deals more with the older Yanmars so only speaking for myself. I am old and slow so humor me. I am not fully understanding which cylinders might be leaking. Lift cylinders or curl cylinders. Which ever, it would sound like fluid is leaking by the piston inside a cylinder. Unless it is causing problems I would probably ignore it.

Out of curiosity, does did your tractor come with a pressure gauge on it?


Thank you sir. I had hoped to reply to both messages, but I am new to forums. I will just ignore the slight leakage of the lift cylinders, and to answer your question, I just placed my crane scale between the bucket and a thick steel rod. I honestly thought I had an issue, and was already pricing rebuild kits. It is only 2015 with 300hours on it, but it seems the previous owner was a construction company, which concerned me.


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