not knowing with one you have i'm assuming it's one of the older models without all the electronics, first make sure the sprocket clutch is driving the pump shaft and the adjustment hasn't slipped out of adjustment or the key in the shaft that drives the adjustment lever isn't sheared or missing, if the shaft is working ok remove the 2 long bolts that hold the housings to the pump that the hoses connect to ,the housing can then be removed exposing the check valves, check them for broken springs or parts ,also you can see the pump piston, rotate the pump and see if the piston moves ,if it doesn't move and the adjustment hasn't slipped something has broke or come loose inside the pump ,the piston has seals inside the cyl. barrel if they wear out generally it's hard to prime and you loose pressure, but in my experience not completely there are 4 bolts that hold the cly. barrel to the crankcase when removed the barrel can be slid off the piston exposing the piston seals, isn't complicated to rebuild even a complete rebuild of the crankcase,a piston seal kit cost aprox.85 dollars most all the ones iv'e talked to that had pumps rebuilt said it cost them from 700 to 800 dollars , i put a seal kit, connecting rod ,bearings and shaft seals in mine for less than 200 a couple years ago sounds to me like someone was making a good profit
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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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