Yard Machines 540 manual Adjusting Handle Height, Adjusting Throttle Control, To Sharpen Blade

Models: 540

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IMPORTANT: The bolt, used to secure the blade to the engine, is specially heat-treated. Do not substitute. To order replacement bolt, refer to the Parts List section of this manual.

WARNING: To ensure safe operation of your unit, all nuts and bolts must be checked periodically for correct tightness.

To Sharpen Blade:

The blade can be sharpened with a file or on a grinding wheel. Do not attempt to sharpen while operator is on the mower.

Follow the original angle of grind as a guide. Make sure that each cutting edge receives an equal amount of grinding to prevent an unbalanced blade.

NOTE: An unbalanced blade will cause excessive vibration when rotating at high speeds, may cause damage to the mower and could break, causing personal injury. Test the blade by balancing it on a round shaft screwdriver or a blade balancer. See Figure 16B.

• If the blade is not balanced, remove metal from the heavy side until it balances evenly.

Adjusting Handle Height

Your mower is shipped with the handle in the higher height position. To lower the handle height, proceed as follows.

Remove the starter rope from the rope guide.

Remove the upper handle by removing the hand knobs and carriage bolts. Lay the upper handle out of the way, being careful not to bend or kink the cables.

Remove the hairpin clips from the weld pins on the handle brackets. Refer to Figure 5 inset. Press out on the legs of the lower handle. Remove lower handle from the mower.

Turn the lower handle around so the notch on the bottom of the lower handle is facing forward as shown in Figure 17A. Reassemble, placing the bottom holes in the handle over the weld pins in the handle mounting bracket.

Height Adjustment

Lever

Notch

Lower

Handle

AB

FIGURE 17

Reassemble the upper handle to the lower handle.

Place the hairpin clips in the inner holes in the weld pins and attach the starter rope as instructed in the Assembly section.

Adjusting Cutting Height

IMPORTANT: All wheels must be placed in the same relative position. For rough or uneven lawns, move the height adjustment lever to a higher position. This will help stop scalping of the grass.

An adjusting plate and thumb lever at each wheel position provides cutting height adjustment. Each adjusting plate has nine height positions. Height of cut will be changed when the thumb lever is moved from one hole to another.

Simply depress the lever towards wheel and move lever assembly to desired position. See Figure 17B.

For rough or uneven lawns, move the height adjustment handles to higher cutting height position.

Adjusting Throttle Control

If the throttle control needs adjustment or if it has been replaced, adjust as follows.

• Remove the screw shown in Figure 18. Remove the cable clamp from the cable.

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Yard Machines 540 manual Adjusting Handle Height, Adjusting Throttle Control, To Sharpen Blade