2-M11
ZD18(F) · ZD21(F) · ZD28(F), WSM
TRANSAXLE
(7) Control Linkage
The motion control lever (1) and the trunnion shaft of variable swashplate are linked with the speed shaft (5), speed
control rod (2) and the trunnion arm (3). As the motion control lever (1) is pushed, the swashplate rotates and forward
travelling speed increases. Pulling the motion control lever (1) increases reverse speed.
A neutral position can be requested by the thing to operate the motion control lever (1). Moreover, it is possible to
fix to a neutral position by putting the motion control lever (1) in the neutral slot (6). The motion control lever (1) is
pushed by the speed limit spring’s (4) working when the motion control lever (1) is removed from the neutral slot (6).
As the result, the machine synchronizes with the movement of the motion control lever (1) and begins to move slowly.
(The machine is set like this.) The damper connected to the speed shaft (5) restricts the movement of the linkage to
prevent abrupt operation or reversing.
 Steering
The Zero-Turn Mower does not have a separate steering system. Steering is accomplished by varying the wheel
motor speeds. This gives the machine a zero-turn capability.
As the control levers are moved to a full left turn position, the right hydraulic pump is moved to the full-speed
forward position and the left pump is moved to the full-speed reverse position. This will allow the machine to pivot
around its center.
(1) Motion Control Lever
(2) Speed Control Rod
(3) Trunnion Arm
(4) Speed Limit Spring
(5) Speed Shaft (6) Neutral Slot
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