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mf 135 hydraulics poor flow

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Pat Hooper

02-10-2008 03:02:08

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I have a 1971 mf 135. Its got an add on hydraulic selector lever on top of the hydraulic pump housing. This supplies a feed to two spool valves one to the lift arms and the other I use for a hydraulic ram for splitting. The hydraulic flow seems poor to me as it takes 10 seconds for the lift arms to go from bottom to top. The splitter takes an age to traverse. I find no fault with pressure as the splitter will go through an ash log sideways!
I measured the flow out of this top selector lever and its about one litre or less a minute at 1500 rpm. I would be most grateful for any guidence. Pat H

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Pat Hooper

02-12-2008 12:54:30

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Re: mf 135 hydraulics poor flow in reply to Pat Hooper, 02-10-2008 03:02:08

I've just had a ureka moment. As the operating control vaves are external then maybe one of the lever contols on the right hand side could be disconnected or pre-set. I say this as it was origionaly all set up for a grass cutter with variable width cut and demanded a slow response.
I take it I can view this linkeage through the oil level cover plate? No I wont put my digits in the hydraulics. Thanks Pat H

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Jerry/MT

02-10-2008 16:07:57

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Re: mf 135 hydraulics poor flow in reply to Pat Hooper, 02-10-2008 03:02:08

You may have a leaking cylinder due to worn seals or even a cracked cylinder. I"m not all that familiar with the MF135 hydraulics but it"s also possible you control valve linkage is not allowing the control valve to open fully or your relief valve may be stuck partially open. To check for lekage, remove the side plate and start the engine and with the pump engaged, move the control lever to the full up position. (UNDER NO CIRCUMSTANCES PLACE YOUR HANDS IN THE HYDRAULIC COMPARTMENT WITH THE ENGINE RUNNING!)Look up at the lift cylinder and if you see more that a few drops of fluid, your lift cylinder is leaking. See that the control linkage moves as te lever goes up. Look for unusual turbulence in the fluid or noise indicating a relief valve cracked open. Shut the engine down and make sure that the contol linage is attached to the control valve.
You might also go to th MF Forum and holer for Big Dean. He knows a lot about these machines.
Hope this helps you

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Pat Hooper

02-12-2008 12:25:19

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Re: mf 135 hydraulics poor flow in reply to Jerry/MT, 02-10-2008 16:07:57

Thanks for the advice but the lift arms are controlled by an external spool valve.

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Jerry/MT

02-12-2008 16:36:31

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Re: mf 135 hydraulics poor flow in reply to Pat Hooper, 02-12-2008 12:25:19

The cylinder can still leak!

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Pat Hooper

02-14-2008 10:05:48

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Re: mf 135 hydraulics poor flow in reply to Jerry/MT, 02-12-2008 16:36:31

Jerry, I was an electronics engineer so you must be patient with me !!
I have looked at the inlet filter on the left hand side by the pto selector and it was nearly blinded by verdigree. I changed the oil not a year ago and cleaned this filter but can only suspect an old ram that i used for a splitter which was full of old oil. The lift arms traverse in under 4 secs now, so will try the log splitter in the next few days. The clue was that the outlet flow came in small doses. I know that the control of flow is controlled at the inlet of the pump. Many thanks Pat H

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Gerald J.

02-12-2008 15:28:19

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Re: mf 135 hydraulics poor flow in reply to Pat Hooper, 02-12-2008 12:25:19

Yes the three point arms are controlled by the new valve, sort of. Pulled back the left valve lets the three point down. In the middle the three point is locked. Forward the three point runs like it did without the auxiliary valve and the controls to the right of the seat work just like they did to operate the pump without the auxiary valve. That's how my MF-135 has worked for the 20 years I've used it.

With the auxiliary valve left handle in the middle the remote valve(s) work. But only if the right original controls are making the pump pump by being full up. The draft feedback still works then too.

Like I said before, look at the suction filter and the original control linkage. You need a shop manual and an owner's manual to learn anything about them. The I&T isn't horrible in that area. The filter is just inside the port plugged on the left side by the PTO shifter. Normal oil level is above the bottoms of both sides of those ports, but if you run one rear tire up on an 8" block, that side won't run out with the port cover off.

Been there done it a few times.

Gerald J.

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Gerald J.

02-10-2008 09:55:23

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Re: mf 135 hydraulics poor flow in reply to Pat Hooper, 02-10-2008 03:02:08

That is poor. But it only does 3.6 gpm when perfect. The controls on the right (original three point lift and draft controls) operate the pump inlet valves so if that linkage is not right the pump won't put out much. The pump won't pump good if the inlet filter screen is plugged.

You can pull the oil level cover off the right side (need to lower the oil or put a 6x8 under the right rear tire) and look for leaks while its pumping. Don't stick your hand in there while its running! You might use a stick to wiggle the pump control lever to see if that increases the flow.

Gerald J.

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Pat Hooper

02-14-2008 10:10:16

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Re: mf 135 hydraulics poor flow in reply to Gerald J., 02-10-2008 09:55:23

Gerald, I have sent this message the the other kid soul who assisted. I was an electronics engineer so you must be patient with me !!
I have looked at the inlet filter on the left hand side by the pto selector and it was nearly blinded by verdigree. I changed the oil not a year ago and cleaned this filter but can only suspect an old ram that i used for a splitter which was full of old oil. The lift arms traverse in under 4 secs now, so will try the log splitter in the next few days. The clue was that the outlet flow came in small doses. I know that the control of flow is controled at the inlet of the pump. Many thanks Pat H

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Pat Hooper

02-12-2008 12:33:55

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Re: mf 135 hydraulics poor flow in reply to Gerald J., 02-10-2008 09:55:23

Thanks for the advice Gerald. I dont think its a leak as the I can hear the relief valve clacking away when the splitter ram gets to the end stops. As I've said the pressure appears to be OK. I think I will have a look at the pump control lever to see if thats the problem. Many thanks.

Pat H

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