If steering is tight in stationary, possible prob is in the pressure switch. switch is locate near orbitrol. 2 wire goes there, im sure you find it. if it doesent work, pump motor doesent start when you rotate steering wheel. micros top of the back tire just give info to logic what is back tire position. example if one micro broke, steering get stiff when u turn right and so on.....check motor brushes and clean the motor with pressure air too. sorry my bad english.
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