1979 John Deere 410 backhoe.
Bought this backhoe not knowing if it would actually start and run. Machine had not been cranked in over a year. A new fuel bowl, filter, (from a local John Deere dealer open on Saturday with parts in stock!) and fresh fuel were added before attempting to start. The backhoe fired right up after bleeding lines. Tires had ample tread, but were severely dry rotted. The machine would move under its own power, but only in reverse and low range. No high range movement in either direction.
Machine was purchased for less than scrap price with the understanding transmission was bad. There was nothing wrong with the transmission. The problem with movement was adjustment of the clutch valve on left side of reverser. O-rings under priority valve were rotted and leaking. Steering cylinders were pouring oil. Ordered parts from John Deere and replaced priority valve O-rings, steering cylinder seals, and wipers. Adjusted clutch dump valve, replaced aftermarket linkage with original linkage, changed all filters. Forward clutches do have some slippage in high range, however, the 410 will push and dig with no problems in low range.
Have used machine for over 13 years now. The 410 has been very useful and hope to keep it working for a long time...