Hi Guys
Good to hear that you are making some progress, but I am sorry to have to be the one to burst your bubble. The pedal needs that play between the where the pedal is completely released to where you feel some weight. Preferably the more the better. If you remove this "freeplay", you are effectively doing the same as resting your foot on the pedal when driving. This is not good!!
If you look in the inspection hole again, there will be three bolts screwed into a steel plate with a lock nut on the bolt screwed up tight against the plate as well evenly spaced around the flywheel (1/3-1/3-1/3). These bolts are horizontal and usually with the head to the rear of the tractor. The head of the bolt will be either 1/2" or 12mm and the nut will be either 1/2" or 13mm There will be another plate at the head of the bolt and the gap between the bolt head and the plate is what needs to be adjusted. Due to wear on the main clutch plate, the gap between the head of the three bolts and the plate mentioned earlier will be too wide and take too much pedal travel to get them to do their job. Once you have found one of the bolts, get some one to press the pedal while you watch what happens inside, you will get the picture of what you are trying to achieve then.
When I dont know what the gap should be adjusted to, the method I use is as follows: -
- Adjust the freeplay on the pedal so as to have enough that when the pedal is fully released the thrust bearing will not be contacting the fingers on the clutch. You can see this through the inspection plate normally if you look towards the rear of the tractor inside the bell hsg.
- Loosen the lock nuts and adjust all three of the bolts so the gap is greater not less.
- Press the pedal down to where you would like the second stage to start, this is normally when the pedal is about 80-85% of the way down to the floor.
- Tie the pedal with some wire at this point to ensure that it stays at the same height through out this adjustment.
- Then screw the bolts outwards until the head of the bolt just comes into contact with the plate mentioned earlier.
- Tighten the lock nut and move on to the next one and repeat the process untill all three are adjusted the same and the locknuts are secured.
- Release the peadl and replace the cover.
- Test the clutch is disengaging correctly without grating.
Normally you would just use a feeler gauge and adjust them all to the same one by one. As an example, the Iseki I was talking about was 40thou, MF135 etc 60thou, David Brown is 1/8" etc. Please be carefull that the ignition key is off and any other precautions that can be made so the tractor cannot inadvertently start while your fingers are in the hole. Never seen or heard of it happening and would rather stay that way thanks.
If any one reading this can give me an idea of the equivalent Yanmar model, I can probably help with definitive inof rather than relying on my mechanical aptitude and bad explanation.
All the best, but please dont leave the pedal without any free play.
Cheers