MT372 3 Point hitch Works Cold not when warm: Mitsubishi  -- Other Tractor Brands Discussion Forum and Review MT372 3 Point hitch Works Cold not when warm: Mitsubishi -- Other Tractor Brands Discussion Forum

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 03-29-2014, 16:35 Post: 189848
tractor71



Join Date: Mar 2014
Location: Oviedo Florida
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 MT372 3 Point hitch Works Cold not when warm

Question on the 3 point hitch - when we start the tractor cold everything works fine. After the tractor runs for about 20 minutes the 3 point hitch gets sluggish and won't raise up and down at all. The fluid is full. Does anyone have any ideas?






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 03-29-2014, 17:24 Post: 189849
mdpinh



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Location: MA
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 MT372 3 Point hitch Works Cold not when warm

Hi,
Can you raise hitch by hand when tractor is off?
Check fluid level when it is warm.






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 03-29-2014, 17:43 Post: 189850
candoarms



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 MT372 3 Point hitch Works Cold not when warm

Tractor71,

Issues of this type are usually related to cavitation problems taking place in the hydraulic pump.

Cavitation can be caused by several things, either individually, or through a combination of things.

Air bubbles in the oil, caused by cavitation, will make it nearly impossible for the pump to develop any useful oil pressure. I have a good feeling that this is your problem, due to the fact that your pump seems to be working fine when cold.

Cavitation can be caused by starving the pump of fluid, which happens when you have a plugged sump screen. It can also be caused by using the incorrect hydraulic fluid. Hydraulic fluids containing detergents will quickly foam up, preventing the pump from building pressure. Water in the oil can cause these problems, as well.

When troubleshooting hydraulic problems, many people jump immediately to the pump as being the culprit, but this is rarely the case.

When was the last time you performed a complete fluid and filter change? Are you using the proper fluid? Have you attempted to remove and clean the sump screen.....provided this applies to your tractor?

Hope this helps.

Joel






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