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MF135 Front End Loader Hydraulics

T

Tony-37

New User
I have an MF135. I am having a problem with the front end loader hydraulics. I started my tractor after two months of non-use. The rear hydraulics worked, but front end loader did not even twitch. I drained the hydraulic fluid, cleaned the metal filter, and put in new fluid. Front hydraulics are still not working; PTO and rear work. I have a lever under the right side of the seat to shift from front to rear hydraulics. With the lever set for front hydraulics, I disconnected the hose that goes to the front hydraulics, but no fluid came out.

What am I missing? Doesn"t the same pump service both the front and rear hydraulics? Is there a second filter? How can I determine what is wrong?

Thanks in advance for any help.

Tony-37
a26290.jpg
 
Hi Tony,
As a starting point the POSITION control lever on the quadrant is in the lower position. When using an isolating valve such as you have on the front of the hydraulic cover the PC lever needs to be in the CONSTANT PUMPING position. If the rear linkage is working then check once again that the isolating valve lever is in the correct position for 'external' hydraulic service.
DavidP, South Wales
 
Yes David is right and it needs to be on "constant pumping" if you are using any external ram for example, tipping a trailer.
 
DavidP,

I'm not sure what you mean by "PC lever in the CONSTANT PUMPING position". I am sending a picture of the lever that selects the rear or front hydraulics. I know this lever box is not standard. Is this the PC lever you are talking about? If so, the picture shows it in the position to select the front hydraulics.
 
I think I can explain it. The levers to operate the 3 pt. on the right of the seat both have to be all the way back(up) for the aux. hydraulics to work. The inner position control actually has to be pulled up all the way and then pushed over, to clear the normal stop, and then pulled back even further to put it in the constant pumping position. If you look close it will say constant pumping on the 3 pt. quadrant. The hyd's. wont work with the clutch all the way down but will with it only half way down(live hyds). When lifting the 3 pt. you don't want to lift it all the way up in constant pumping position. That's why the first stop is on the quadrant. Hope I explained it for you. Dave
 
He's talking about the lever on the quadrant for the 3 pt. arms. In the picture it's down- it needs to be up, and in the constant pumping position. It should be there either stamped in or on the decal, whichever your tractor has, around the lever. Our 165 doesn't have one of those selectors, but I've read a lot about them.

Our 165 has a crankshaft driven pump for the loader.

Donovan from Wisconsin
Click to expand...
 
Roy in UK (and others),

It has taken me a while to reply as I had taken off the lever plate on the right side for slow/fast drop speed. I put it back on, added transmission fluid, and tried what you suggested. Anyway, I'm still having problems with the front hydraulics. There are two levers below the right side of the seat. I pushed the innermost one all the way to "CONSTANT PUMPING" position. The outermost one raises and lowers the rear hydraulics, so I don't know how I can put this in the top/rearmost position. I have attached a picture of the "Constant Pumping" position.

Am I missing something else? Could I have put the slow/fast drop speed lever/plate on wrong?

Thanks for all of your help.

Tony-37
a26307.jpg
 
Hi Tony,
When an isolating valve is fitted you will need to move both quadrant levers into the raised for the outer DRAFT lever and CONSTANT PUMPING for the inner one. Selecting the external service on the isloating valve diverts the oil flow to the loader valve or whatever. Have you tried moving the iso valve slightly to check that you have the EXACT position selected? Just wondering if the stop (assume there is one) on the valve is 100% correct.
When the iso valve is selected correctly for the loader movement of the quadrant levers will have no effect on the 3-pt linkage as the oil in the lift cylinder is sealed off and the oil flow from the pump is sent to an external service.
DavidP
 
The lever with the round ball on the end is the draft position. It will lift the 3 pt. to where the other lever(position control) is set. It is not normally used for raising and lowering the 3 pt. unless you are using something that digs in the ground like a plow. For your aux. hydraulics to work BOTH the draft and position control levers have to be all the way up. If either one isn't up as far as it will go, your loader hyds. won't work. Dave
 
DavidP,

Thanks a bunch. I now have a working front end loader. I guess I really need an operation manual.

Tony-37
 
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