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A mower includes a zero turn radius (ZTR) traction unit carrying a front mounted cutting deck. The cutting deck is suspended beneath a carrier frame by a height of cut adjustment system comprising a plurality of pivot links and suspension chains extending between the carrier frame and the cutting de

A mower includes a zero turn radius (ZTR) traction unit carrying a front mounted cutting deck. The cutting deck is suspended beneath a carrier frame by a height of cut adjustment system comprising a plurality of pivot links and suspension chains extending between the carrier frame and the cutting deck. A hydraulic cylinder coupled to one of the pivot links can simultaneously lift the chains or permit the chains to lower to change the height of the cutting deck relative to the carrier frame. This same cylinder can also fold the carrier frame and the cutting deck relative to the traction unit about a fold pivot axis when a fold latch is selectively released by the operator. The carrier frame includes a center step for helping the operator mount or dismount the traction unit. The center step has a front viewport for allowing an operator who is seated on the traction unit to view the front edge of the cutting deck.

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We claim: 1. A mower for cutting grass, which comprises: (a) a traction unit having a prime mover, the traction unit being supported for rolling over the ground, the traction unit including a plurality of wheels at least one of which is a drive wheel for propelling the traction unit over the ground

We claim: 1. A mower for cutting grass, which comprises: (a) a traction unit having a prime mover, the traction unit being supported for rolling over the ground, the traction unit including a plurality of wheels at least one of which is a drive wheel for propelling the traction unit over the ground, the traction unit also including a seat for carrying a seated operator; (b) a carrier frame operatively coupled to the traction unit for carrying a cutting deck having at least one rotary blade for cutting grass, wherein at least a portion of the carrier frame overlies at least a portion of a front edge of the cutting deck with the seat on the traction unit being located behind the portion of the front edge of the cutting deck; (c) a step surface provided on the overlying portion of the carrier frame to help an operator mount or dismount from the traction unit by stepping onto the carrier frame, wherein the step surface is located to block the operator's view from the seat to the portion of the front edge of the cutting deck; and (d) a viewport in the step surface to allow the operator to see the portion of the front edge of the cutting deck while seated on the seat. 2. The mower of claim 1, wherein the step surface is a dimpled surface. 3. The mower of claim 1, wherein the step surface is a non-skid surface. 4. A mower for cutting grass, which comprises: (a) a traction unit having a prime mover and a seat for carrying a seated operator, the traction unit being supported for rolling over the ground; (b) a carrier frame having a pair of forwardly extending arms, wherein each arm carries a rotatable, ground engaging front wheel; (c) a cutting deck having at least one rotary blade for cutting grass, wherein the cutting deck is carried by the carrier frame with the forwardly extending arms of the carrier frame passing over the cutting deck and with the front wheels on the arms of the carrier frame being located ahead of adjacent portions of a front edge of the cutting deck; (d) a step surface located between the forwardly extending arms of the carrier frame in advance of the seat to allow the operator to mount or dismount the seat by stepping onto the step surface to approach the seat, wherein the step surface extends far enough forwardly relative to the carrier frame such that a front portion of the step surface blocks the view of the operator of a portion of the front edge of the cutting deck between the ground engaging wheels when the operator is seated on the seat; and (e) a viewport in the step surface to allow the operator when seated on the seat to see through the step surface and observe the portion of the front edge of the cutting deck that would otherwise have been blocked to the operator's view by the front portion of the step surface. 5. The mower of claim 4, wherein each front wheel on each arm is a caster wheel. 6. The mower of claim 4, wherein the viewport is a transversely extending, elongated slot in the front portion of the step surface. 7. The mower of claim 4, wherein the carrier frame is separate from and connected to the traction unit. 8. The mower of claim 7, wherein the carrier frame is connected to the traction unit for pivoting relative to the traction unit about at least one horizontal, transverse pivot axis. 9. The mower of claim 4, wherein the cutting deck is connected to the carrier frame by a height of cut adjustment system. 10. The mower of claim 4, wherein the step surface is carried by the carrier frame. 11. The mower of claim 4, wherein the step surface extends transversely for a distance that bridges substantially entirely between the arms of the carrier frame.