Steering Gear Box; Structure - Kubota L3200 Workshop Manual

L3200, WSM

[2] STEERING GEAR BOX

(1) Structure

(1) Input Shaft
(2) Torsion Bar
This integral power steering mechanism consists of the following two major components as shown above: hydraulic
control valve and steering force assist hydraulic cylinder. The control valve is housed in the casing and composed of
sleeve (3), input shaft (1) and other parts. The hydraulic cylinder, on the other hand, is composed of gear box (7)
(cylinder tube), ball nut (4) (piston) and other parts. When the steering wheel is turned, the reaction force from the
tires is exerted through the sector shaft (6) onto the main shaft (5). The torsion bar (2) is then twisted to make a gap
between the input shaft (1) and sleeve (3). Such gap activates the valve to switch the oil flow direction. The sector
shaft's pinion, which comes in mesh with the ball nut's rack, is tapered along the teeth. In this way, the sector shaft
(6) that turns by the adjust screw (8) changes the clearance between the rack and pinion, adjusting the play of the
steering wheel. (Tighten the adjust screw and the play becomes smaller, and vice versa.).
(3) Sleeve
(4) Ball Nut
(5) Main Shaft
(6) Sector Shaft
7-M2
STEERING
(7) Gear Box
(8) Adjusting Screw
KiSC issued 12, 2006 A