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The SN break was at 201,000. The later tractors have the three point and SCVs on a console to the right of the seat and hydraulic outlets with the tortoise/rabbit symbols next to flow levers. The early tractors have the three point and scvs on the dash to the left of the steering wheel. There is so little interchangable between the two vintages that they have distinct shop manuals and parts books. There is a hand lever operated clutch, the cold start disconnect clutch for the Power Shift transmission. The "clutch pedal" only opens some valves to take hyraulic pressure off some clutches in the transmission for inching purposes. The hydraulic pressure to run the PS comes from a pump in the transmission. That pump also feeds the front hydraulic pump through a small reservoir and check valve. You need two things for main hydraulics oil in the front reservoir and the transmission turning. If the cold start clutch isn't engaged you will run out of oil up front shortly. If the check valve is leaking and that is a very common problem you won't have steering when starting. There is a fix for the check valve in a vintage Deere Service Information. Its not well known, so I have the information on in on a web page. It really fixed my gas 4020 with SR transmission. I can crank it after sitting over a couple months, and with the clutch still pushed lift up the loader before ever allowing the transmission to turn. But if the transmission is turning, there should be oil to the front pump and pressure, so you could have a bad charge/transmission oil pump beecause without pressure from that transmission oil pump the PS transmission is not going to work. There some checks in the I&T manual to test that pump for flow and pressure. Gerald J.
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