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Re: I'm Not sure I understand what your saying.
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1 You need an unworn clutch plate to set it back to standard as you need the correct thickness of the Plate as it is in unworn state. You can use the old plate once the Clutch has been re-set providing it is not too worn. No-one would fit a badly worn plate. Wear takes place where the Levers pivot, this is difficult to check due to the pressure from the Springs, unless you dismantle the Clutch completely.
2 You need to get the correct amount of movement or separation of the Clutch and you can't do it by setting the Clutch using an old plate
3 You have missed out the previous part to the answer, you need to have a reasonable amount of wear left on the friction material if you intend to re-fit the old Plate for further use. One side of the Plate wears more than the other so check it carefully.
4 If you didn't buy a genuine Plate I don't know who made the plate, but a lot do use them with complete success, but they don't carry the MF warranty, but they carry one from the Plate manufacturer. Being as we don't know the Plate manufacturer, we can't say what the warranty would be, but there will be one.
5 I didn't say that the plate you have is not warranted, as I just don't know what you have. I can only quote the MF spec which is the one recommended to use.
6 It does not give the thickness of the Plate in the Service manual and I don't have a plate that I can measure. When I said about how much wear is left in the old plate, that was how much wear is left in the old plate before the linings are worn down to the rivets and is no longer serviceable.
Most of the Clutches used on these tractors can be adjusted for wear, but there is at least one type that you can't. The adjustment will be on each Lever and will be a slotted screw with a locknut usually. When the Service Engineers are setting the Clutches, they don't use a Plate on the setting jig, they use metal spacers, so that there is no variation and all settings will be the same, But being without the correct tool, you use a new Clutch Plate instead which is perfectly satisfactory. While the Plate you have seems not to be of the correct dimensions, you have little alternative here, if as you say the new plate is thinner than the old worn one, I would check the Clutch Levers using the old plate as it is nearer to the correct tolerance than the new Plate in this instance.There is very little movement on the Clutch Levers and as the Plate wears the Levers rise and press on the Thrust Bearing and if not adjusted will cause the Clutch to slip.Because you are fitting a thinner Plate, the Lever adjustment will need checking or the Levers could be too high.If the Levers are not set correctly, they could travel down-wards too far as you press the pedal and hit the Plate and bend or break them off.John(UK)...firstname.lastname@example.org
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