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Re: TO20 radius arms

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02-05-2013 02:41:21

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The reason the Radius Rods have bent is that the Centre Axle Pin and Bush is worn and is allowing the axle Beam to twist, allowing the wheels to move back-wards under the tractor. There should be no twisting load on the Radius Rods at all, it should all be taken by the Centre Pin. The Radius Rods are really only there to give support to the outer ends of the axle when the wheel Track is opened wider. If you don"t replace the Pivot Pin, the wear will allow the Axle Beam to rise more than it should when the tractor is running on rough ground or if the left side wheel lifts for any reason, this will allow the Axle Beam to strike the bottom hose connection on the Radiator and in some instances will knock it off completely. There are more than one bush and pin combination for these tractors, so make sure that you get it right. Early tractors had a thin wall bush, later tractors had a thick wall bush with a collar on one end. This later Bush has a larger outside diameter and will not fit in place of the thin wall bush, it needs a different axle beam to do that. The 35 tractors are like this and the beam will interchange. You should fit 2 of the heavier bush although it was only listing one in the parts list, this gives better support. When the axle bushes and pins are correct, it restores the Castor angle of the King Pins and you will find the steering very much lighter. A good indication that there is wear in the Axle Pin is that the steering will "shimmy" when you try to run at speed on the road.If you want more info about the Pins and Bush combinations, email me giving the length of the Pin.. You should also check the Thrust Bearing at the bottom of the King Pin (see pic attached)as it doesn"t get too much lube if it is worn, the grease comes out of the top instead so you stop pumping the grease, this too will make the steering much lighter. John(UK)

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