I would think the hi psi switch is normally closed,so jumping it would do nothing anyway.If your tractor has a ccot system,like most cars,(an accumulator instead of a drier) you would have a low pressure switch on the accumulator.Check for voltage there,and jump the terminals if you do.If clutch engages and it cools good=bad switch;if it engages but does not cool good=low on refrigerant.If no voltage go back to the switch,or fuse,or possible relay for the ac clutch.Maybe wiring issue also.Mark
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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