I agree with SV--The early 7020 had the same engine as a 4620 and the later ones had the 4630 engine--so The knob shut-off is most likely the linkage on the side of the pump--have someone run the throttle while you watch the lever on the side of the pump. You might have to adjust the linkage. Like SV said--the charge pump feeds your main pump and when you push in the clutch it stops--I would start by changing the hydraulic oil filter first and go from there.---Get your muti-meter out and stat checking voltage while someone runs the key for you starter trouble--you should be able to narrow it down pretty fast.---I would check the PTO cable -If the previous owner never used it the cable most likely froze--Penetrating oil?--Good luck--My first 4-wheel drive was a 7020--remember--NO live PTO--Good Luck---TEE Had a Deere 3200 6-18's plow--pulled it good--I wished I would have kept the 7020--Mine was a early one but someone put the 4630 engine in it.
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