JD 425 hydraulics not happy

866 Views 6 Replies 5 Participants Last post by TUDOR, Mar 26, 2019

avallk

Discussion Starter · Mar 25, 2019

My JD 425 has 3804 hours on it. Most of the time she runs just fine... however... I went to use the loader and it wouldn't raise, tip, etc... Checked the hydraulic fluid and it was extremely low. So I went to the local deere dealer and got some and filled her up. Now the bucket will raise and lower, but it's VERY choppy. I have moved the tractor back and forth to try to get the fluid into the hydraulics. It's better, but not happy. Any insight, ideas, etc would be greatly appreciated.
Here is a link to a video - I tried to upload, but it's not allowed.
https://photos.app.goo.gl/4i8Bj4quCgDswBjL8

Thanks
Ken

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nick4030

· #2 · Mar 25, 2019

Does the tractor still drive?

Sent from my SM-G960U using Tapatalk

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avallk

Discussion Starter · #3 · Mar 25, 2019

Yes... no apparent issues with driving.

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Junky

· #4 · Mar 25, 2019

I would think the choppy action would indicate air in the system, or a bent ram.

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avallk

Discussion Starter · #5 · Mar 25, 2019

Junky said:
I would think the choppy action would indicate air in the system, or a bent ram.

How would I bleed the air out of the system? Just keep moving it?

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rwmeyer

· #6 · Mar 25, 2019

Aval, Yup, keep moving your loader arms and bucket, full travel in both directions...down to ground is good enough for loader arms. Keep checking hyd. level though or you'll introduce more air into system! Bib

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TUDOR

· #7 · Mar 26, 2019

rwmeyer said:
Aval, Yup, keep moving your loader arms and bucket, full travel in both directions...down to ground is good enough for loader arms. Keep checking hyd. level though or you'll introduce more air into system! Bib

Agreed. It takes a bit of patience for the first full stroke cycle, but the second goes quite a bit quicker. Readjust the fluid level with all 4 cylinders fully retracted after the second full stroke cycle.

Usually two full stroke cycles will fill the loader hydraulics enough to work with. There will still be a small amount of air present that will gradually be purged out with working the loader.

If the serious jerkiness continues after two cycles, check the supply line to the hydro for cracks and the filter for proper sealing that may allow air to enter the system.

Jerkiness is usually either caused by air in the system or a low fluid level. From the sound and speed observed in the video, my first thought is low fluid, but that will also have a negative effect on the drive.

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