I posted on another page, but Maybe better here

[mtnman1955]

Have an Old R510 B, It's stuck in forward, took off F&R solenoid cleaned and bench tested, seems to be working. Put it on and left it un hooked started her up, put lever in drive and still goes forward.
Has power too. New Kubota F&R shift lever, new HST tandem pump. Still only goes forward. Any ideas? Thanks