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Fordson 57 FMD dual clutch rebuild

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Mark_99999

01-12-2005 13:26:36

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Hi,
I have almost finished the rebuild of the clutch and need some advice on initial adjustment of the relase lever adjusting screws on the clutch release arms before I put the tractor halves back together.
The I.T. Service manual I have says I need a special adjusting fixture (Nuday part no. NE-7502)
which bolts onto the flywheel and has various spacers and an adjusting nut. It also has a gauge block that each of the transmission and PTO release arms need to be adjusted against. There are also some spacers that apparently need to be inserted between the clutch plates when you adjust the screws.
I can make something up for aligning the spigot bearing and the clutch plates so that they are all central, but I am not sure about the release arm adjustment.
Do any of you knowledgable people have any suggestions or methods for adjusting the clutch plates without this special tool? Is there a standard measurement from the PTO pressure plate to the release arm screws for the transmission and PTO release arm screws?
Thanks for your help.
Regards,
Mark

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shayne stankov

01-14-2005 13:36:10

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Re: Fordson 57 FMD dual clutch rebuild in reply to Mark_99999, 01-12-2005 13:26:36

Humm... good luck. I had the same problem and the only answer I found on this site was "yes you need the special jigs to set it up". Sucked. I ended up calling all Ford dealers in a tri-county area and finaly found one who still had the jigs around(and someone who remembered what they were for!), and they set up the clutch for me at a minimal charge. The dealer is in South West Ontario(Canada)if this helps you out any. E-mail me directly if you need more info.

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Steven B

01-14-2005 15:59:24

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Re: Fordson 57 FMD dual clutch rebuild in reply to shayne stankov, 01-14-2005 13:36:10

I did it without the tool. I have replaced both clutch plates and the pins for the main clutch lever. As the clutch worked fine before all I did was use a vernier calliper. I assembled the clutch then mesured the distance from the housing to the PTO buttons and leveled them of (one was out so it got adjusted). I then mesured the main buttons and leveled them out. I cant remember the diffrence between the pto and main buttons but I seem to think it was in the order of .3 of an inch (check what you have at the moment and get back to me).

as soon as you get the two halves of the tractor back together you can test by moving the clutch lever by hand and make sure you can feel the main then pto clutch reease. I did this before final assembly of the tractor.

If you can find someone with the tool then go that way.

Steven B

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mark_99

01-16-2005 14:20:26

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Re: Fordson 57 FMD dual clutch rebuild in reply to Steven B, 01-14-2005 15:59:24

Thanks Shayne and Steven, I have fixed the clutch and the tractor is back together and running.
I could not source the correct tool for setting up the clutch. I found a cryptic piece of information in a general specifications manual at my local tractor shop that said using 0.330" spacers between the centre plate and the trans pressure plate, adjust the PTO fingers to 3.105" and then adjust the PTO fingers to 2.470" measured from the front mounting face of the centre plate. Thats right, it said to adjust the PTO fingers twice. I measured the existing clearances with the spacers (actually the old 3/8" UNF locknuts from the 12 clutch spring pins are 0.335") in between the trans pressure plate / centre plate and centre plate / PTO pressure plate. I used a piece of 1/4" key steel as a straight edge on the PTO side of the centre plate and measured from PTO face of the centre plate to the head of the adjusting screws. One of the trans finger screws was actually 3.105", so I accepted this value as correct. I found that the PTO fingers screw heights were 2.080", 2.140" and 2.200". These were miles away from the 2.470", so I assumed the spacer needed to be considered, ie. 2.470"-0.330"=2.140" and settled on 2.140" as the correct value.
I put the tractor back together and found the PTO only just disengaged at the bottom of the pedal travel and the trans would only just disengage at the top of the pedal. Oh well, split the tractor again!
I had another look at the cryptic information as I must have got it wrong. Maybe I shouldn"t have had a spacer between the PTO pressure plate and the centre plate? This time I worked on the difference between the settings ie 3.105"-2.470"=0.635". The pitch of the adjusting screw thread was 0.0485", so working it backwards, I had to make up 6.8 turns between the adjusting screws. The PTO screws would not adjust out that much so I screwed the PTO screws out 5 turns and the trans screws in 1.8 turns. I put the tractor back together and it works!
With a little adjustment of the release rod, the PTO engages at 1/3 pedal height and the trans engages at 2/3 pedal height, with 1/2" pedal free play.
Please let me know if you would like further info about the rebuild. I learnt a lot from the experience and I am sure others will need it in the future as the correct adjusting tools are almost extinct.
Oh, I almost forgot! The cause of the clutch failure was the previous mongrel who worked on the clutch before I owned it used old nails instead of split pins. One of the nails broke off and allowed a pin to become dislodged. The pin connecting one of the release linkages to the trans pressure plate came partially out after failure of the nail retaining it. The head of the pin jammed between the clutch housing and the flywheel preventing the clutch from disengaging. The clutch metal faces have been machined and everything reassembled with real split pins and good quality circlips.
I was just fortunate that the clutch failed when I only had around 1/2 acre left to bale. (yes it is summer time down here in Australia! Get an atlas out and look for a town called Latrobe in Tasmania)
Thanks for your contribution gentlemen, and may the rains come when you need them!

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Shayne Stankov

01-21-2005 07:50:33

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Re: Fordson 57 FMD dual clutch rebuild in reply to mark_99, 01-16-2005 14:20:26

Hummm.... Thats a lot of numbers! Do you have what the final measurments from the mounting face of the centre plate? Perhaps it is in your discription, but not having the clutch here in front of me, I kinda got lost. My clutch is still not quite exactly right (even after the dealership set it up!), and I may get the gumption to split her again this summer and set it up right.

Thanks

Shayne

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mark99

02-01-2005 18:18:53

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Re: Fordson 57 FMD dual clutch rebuild in reply to Shayne Stankov, 01-21-2005 07:50:33

Shayne,
The measurements are made from the PTO side face of the centre drive plate to the adjusting bolt(s) on the release arms. The clutch is loosely reassembled on the bench without the clutch plates but installed with 3 x 0.330" spacers each between the Trans pressure plate / centre plate and the pto pressure plate / centre plate. I used a piece of 1/4" key steel (used for making shaft keys) laying on the pto face of the centre drive plate, bridging the bore of the drive plate to make it easier to measure the height of the release arm bolts with a vernier caliper.
The final heights of the arms measured as described above is 2.382" for the PTO release arms and 3.017" for the transmission release arms.
As you would be aware, an old gearbox input shaft will be required for ensuring concentricity of the pilot bearing, transmission and PTO clutch plates. I did not have one of those either, so I had something made up at a local machine shop for $30 out of an old piece of bar. It did not have the splines; just machined to the inside diameter of the clutch plates and the bore of the pilot bearing. Let me know if you want the dimensions and I will measure it up give them to you.
After reassembling, the clutch control rod length needed to be adjusted. The final length was around 14-7/8" to obtain the beast operation, instead of the 15" specified in the workshop manual. Pretty close.
Thanks for your interest and I hope this information is useful to you.
Regards,
Mark

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