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Change Hydraulic fluid up ok down slow

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frank016
Join Date: Apr 2013
Posts: 9 new zealand
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2013-04-06          186587


Changed the transmission oil, now the hydraulics are very very slow going down!! Up is fine. This is a MT 4700 model.
Anyone out there that can help??
Thanks Frank




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Change Hydraulic fluid up ok down slow

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hardwood
Join Date: Dec 2002
Posts: 3583 iowa
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2013-04-06          186588


Frank;

So long as it worked properly before the change it has to be something simple, we hope.

It has the symptoms of an air lock somewhere in the system.

Can you disconnect the hose couplers from the down side of the loader cylinders and bleed air from them?

Is there perhaps a quick coupler that is popped out a bit and trapping the air or fluid from returning to the sump?

When turning the steering wheel lock to lock does it operate normaly, or does it hiss and growl?

Not being familliar with your brand of tractor there are likely lots of other simple things that it can be too. You will find it don't give up.

Frank, another Frank. ....


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Change Hydraulic fluid up ok down slow

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frank016
Join Date: Apr 2013
Posts: 9 new zealand
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2013-04-06          186596


The front hydrauilcs work fine! Its the 3 point hitch that is the problem. This tractor is about 19hp.
Thanks Frank
....


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Change Hydraulic fluid up ok down slow

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hardwood
Join Date: Dec 2002
Posts: 3583 iowa
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2013-04-06          186598


Frank;

Most small tractors have a speed control valve for the drop speed of the three point hitch usually located just below the front of the seat. Look in your owners manual for instructions on using this valve. It may be that the changing of the fluids diosdloged a piece of something that has the valve clogged.

Frank. ....


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Change Hydraulic fluid up ok down slow

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kthompson
Join Date: Oct 2005
Posts: 5275 South Carolina
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2013-04-06          186599


Think Hardwood is on the right track. Look for a knob that control the down speed on the 3 pth hitch. Often a knob between your legs on the tractor. ....


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Change Hydraulic fluid up ok down slow

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frank016
Join Date: Apr 2013
Posts: 9 new zealand
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2013-04-07          186605


Wow! Yes there is some sort of knob thingy at the front of the seat. It looks like it has an ajusting screw too. Don't have a manual, so I will just remove the knob an have a look-see.
Thank you so much Frank!!! ....


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Change Hydraulic fluid up ok down slow

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hardwood
Join Date: Dec 2002
Posts: 3583 iowa
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2013-04-07          186606


WOAH Frank!!!

I don't think you should screw the adjusting valve completely out. I don't know this for sure but there may be a ball and/or spring that may come out too. I don't think you want that to happen. Just turn it out a couple turns then try it, if that don't help, a couple more turns, that should be plenty.

Any that I have been exposed to screw out to speed up the drop, that may not be so with your tractor it may screw in, but I'd really doubt it. Try a couple turns both directions.

Frank. ....


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Change Hydraulic fluid up ok down slow

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sherlock
Join Date: Dec 2012
Posts: 6 Northern Territory
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2013-04-08          186613


Underneath the front on the seat is a small lever - left down slow - right down fast - try moving the lever ....


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Change Hydraulic fluid up ok down slow

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frank016
Join Date: Apr 2013
Posts: 9 new zealand
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2013-04-09          186616


I fiddled with the knob at the front of the seat. Now the hydraulics work perfectly!!
Unreal! THANK YOU SO MUCH FRANK!!!!!!!!!!!!!!!!!!! ....


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Change Hydraulic fluid up ok down slow

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frank016
Join Date: Apr 2013
Posts: 9 new zealand
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2013-04-09          186617


The hydraulics work so well now, its like I have down pressure!!
Now where can I find a manual???? Mitsubishi MT 4700
Thanks a Million! Frank ....


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