Hi, If the other gear lever changes cleanly then you probably have some wear on the synchro unit. The only option is to give it a bit more time on changes and make sure the tractor is not still moving. There is no adjustment to carry out on the clutch as it is self adjusting. The adjuster bolt on the slave cylinder should have been adjusted when the cylinder was fitted. If the clutch pedal feels spongy you could try bleeding it. Regards Mike