gsw911
New member
Kubota recommends checking the VHT neutral spring every 100 hours. This spring determines the rate of deceleration when your foot is lifted from the speed control pedal. The attached diagram and procedure subjectively leaves it to the service person to determine the proper return rate. It seems from some of the posts on this forum that the speed reduction is way too fast...hence add on parts are installed like a coast valve which has no holding power on a hill and forces an operator to apply the brakes. My impression is Kubota want's the RTV to be as safe as possible, and they prefer the vehicle to stop as soon as possible. The spring is adjusted at the factory to the rate they feel is the safest possible rate of return.
As the deceleration gas piston wears and becomes weaker the speed control return rate speeds up which causes the RTV to decelerate faster. Increasing the length of the adjustment screw which loosens the spring tension slows the return rate, shortening the screw speeds the return rate. I make no recommendation for proper adjustment...... the user/reader has to determine the proper adjustment for themselves.
As the deceleration gas piston wears and becomes weaker the speed control return rate speeds up which causes the RTV to decelerate faster. Increasing the length of the adjustment screw which loosens the spring tension slows the return rate, shortening the screw speeds the return rate. I make no recommendation for proper adjustment...... the user/reader has to determine the proper adjustment for themselves.