|
Lots of differences. PS has two oil filters on the left side. PS has a single position shift lever, a V shaped groove on the dash, short leg for reverse gears. PS has a short PTO shift lever and an added lever for transmission disconnect. PS "clutch pedal" (officiallly called the "inching pedal" doesn't link to the clutch area but to a hydraulic valve. Probably doesn't have a free play adjustment. From the bottom the decal on forward goes 1 to 9. SR has one oil filter. SR has single shift lever with 5 positions on the left and three gears available on the right for each of the 4 working positions on the left. Two foward and reverse in the lower two ranges (lower three on 4010). Reverse isn't available on the top ranges. The PTO shift lever is long. The clutch pedal has a long arm and has a free play adjustment (which should be easy to feel). From the top the right side of the shift decal will in the order 1, 3, 1r, 2, 5, 2r, 4, 7, 6, 8. If you try to shift the SR ranges (left side) without clutch the tranmission will clash and grind. The PS shifts without any clutch pedal needed, sometimes a little harshly. While neither transmission is absolutely bullet proof, my neighbor farmed with PS more than 30 years without breaking any. SR seems as reliable. SR is most often destroyed by towing without the shift lever being in the TOW position. That overspeeds the top shaft without lubrication and welds gears to the shaft. PS should be more expensive to fix, but repairs on either are not very common from the 4020 era. Shift linkage wear on the SR seem to be more common but that's not hard to fix, all outside the transmission. The power to the ground is higher with the SR than the PS transmission for the same engine power. Gerald J.
|
