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Massey Harris & Massey Ferguson Tractors Discussion Forum
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MF-135 PTO clutch adjustment question

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ChuckWFW

06-08-2007 10:51:44




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I have a 1970 MF-135 Orchard with a dual clutch. I am unable to engage the engine speed setting of the PTO with the engine running. Gears grind. I can engage by shutting down the engine and then restarting. I have been thru the adj procedure on Big-Dean"s cd ( went down to a clearence of 045) to no avail. I can live with the clutch needs replacing but the thing I don"t understand is that once the pto is engaged the clutch works ok, i.e.depressing clutch pedal disengages the pto ( mower blades stop spinning ) is there another adj I need to make or could something be siezed on the clutch shaft. any ideas are welcome.

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DavidP, South Wales

06-08-2007 13:05:52




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 Re: MF-135 PTO clutch adjustment question in reply to ChuckWFW, 06-08-2007 10:51:44  
Hi Chuck,
With a clearance of 045 you will not have much of a first stage. The pedal position that you should be aiming for is for forward drive to have disengaged at the top of the second stage. The PTO should disengage (nothing attached) about 1 inch off full depression of the clutch. Readjust the PTO screws back to about 080. All even is more important than the exact measurement. There is a latch on the LH footplate to prevent the PTO being disengaged. Make sure this is not fouling the pedal. I suspect that you may also have excessive 'free travel' on the clutch pedal. There should be a maximum gap of about 3/8 of an inch under the footbar before the pressure starts. Adjust by slackening the clamp bolt and adjust with a screw driver through the hole in the end of the shaft. It is possible for the release levers to make contact with the rivet heads on the clutch plate and effectively keep it turning. Look at the clutch unit with a flashlight while an assistant presses the pedal.
Look also for any signs of oil which could make the plate sticky.
Please come back
David P

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ChuckWFW

06-08-2007 13:28:10




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 Re: MF-135 PTO clutch adjustment question in reply to DavidP, South Wales, 06-08-2007 13:05:52  
David, when I started this whole process the clearence of the 3 pto adj bolts was about 090 so I'll go back to that. when I hit 'bottom' on the clutch pedal it is not contacting the footboards yet but it is a very solid stop. The oem footboards are long gone so there is no pto safeguard latches. I will look at the whole setup this weekend with an eye towards the clutch pedal / pedal shaft relationship. Thanks for responding so quickly

Chuck

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DavidP, South Wales

06-09-2007 23:08:21




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 Re: MF-135 PTO clutch adjustment question in reply to ChuckWFW, 06-08-2007 13:28:10  
Hi Chuck,
If the pedal is bottomming it is probably due to the coil springs closing completely. I think that there might be a lot of wear between the release levers and the PTO pressure plate in the linkage so that you are loosing movement. Also compare the amount of operation. It may only be lifting off on two 'sides'.
DavidP



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Bob from Australia

06-08-2007 17:15:17




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 Re: MF-135 PTO clutch adjustment question in reply to ChuckWFW, 06-08-2007 13:28:10  
If you are not sucessful in adjusting the clutch it is probably worn.

It is not difficult to split the tractor and replace the whole clutch assembly. I did this with my tractor following persistant clutch problems. I used a genuine manual, plus Big Deans CD and the excellent instructions provided on this site by Jack in NB. I bought the clutch assembly from Bareco. It was preadjusted perfectly. The whole job took about 3 hours and the clutch has worked perfectly now for about 5 years.

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