350 hot hydraulics ?

riverbend · May 27, 2015

I was running the disk around a little this morning and started to smell something hot. The hydraulic pump is at about 320 degrees. The head is around 180, distributor and oil fill are over 200. The hydraulic oil level is a little low - up to the 'W' on the dpistick (the disk is still hooked up), is that enough to make it so hot ? What else should I check ?

Thanks

Greg

Farmall43 · May 27, 2015

Check the wire filter in the reservoir. Unfortunately it is at the bottom so you will drain the fluid out to do it. If it is plugged partially or mostly it will cause the pup to over heat due to how much harder it is working to pull oil from the reservoir. I had that issue with my 450 and that was the solution for me. Good luck. Maybe others will have other simpler things to check first.

Matt

riverbend · May 27, 2015

When I pulled the filter out is was not all plugged up, but the fluid came out milky looking. When I was cleaning up the milkiness appears to be caused by air. Don't know it that is normal for these tractors, but it does not seem right.

BTW. The brass screen on the filter has seen better days. Does anyone recover them, or just replace it ?

Greg

pete 23 · May 27, 2015

You need to determine if system is staying on demand (relief valve pressure) when in neutral. This is easy to tell by dead heading a valve to see if additional strain is heard on system. If it strains the same dead headed or not you are on high pressure. Most likely caused by single to double action setting on valve has been forced past the roll pin stop or broken roll pin. Other wise, plugged orfice in the regulator valve assembly.

Farmall43 · May 27, 2015

When was the last time you changed fluid? Milky typically means water, however if you are seeing a lot of tiny bubbles that is a different issue.

dhermesc · May 27, 2015

How do you fix that? My 350 has a valve that turns on its own (far right that pokes through the cowl) and will put strain on the engine. You can turn it back to the nuetral position with your fingers. After using the hydraulics it turns again.

dewy · May 27, 2015

if bubbles whats the issue...

kub6040 · May 27, 2015

Bubbles caused by boiling oil !

pete 23 · May 27, 2015

There is a roll pin that limits the travel of the valve for setting it to double or single action. Yours must be broke off. It is easily visible with right hood removed and can be replaced without any disassembly except removing broken pin. On rare occasion someone may have man handled it and bent the internal link so the standard position marked S & D will allow it to remain on pressure and in that case it is dismantle or find a neutral spot and jerry rig it so it cannot turn.

Farmall43 · May 28, 2015

here is a link that will help explain.
Helpful link

riverbend · May 31, 2015

Thanks Pete, it was the roll pin that had broken off and let the D-S selector turn past the S location. I disked up about 3/4 of what I had done when the hydraulics got so hot. The temperature of the pump was under 100 degrees and other parts of the motor were a little warmer (the head was 192).

Greg

350 hot hydraulics ?

riverbend

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Farmall43

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riverbend

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pete 23

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Farmall43

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dewy

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pete 23

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Farmall43

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