Hayter Mowers RZT420H manual Installing the Blades

A blade that is bent or damaged could break apart and could seriously injure or kill you or bystanders.

•Always replace bent or damaged blade with a new blade.

•Never file or create sharp notches in the edges or surfaces of blade.

Removing the Blades

The blades must be replaced if a solid object is hit, if the blade is out of balance, or the blade is bent. To ensure optimum performance and continued safety conformance of the machine, use genuine Hayter replacement blades. Replacement blades made by other manufacturers may result in non-conformance with safety standards.

Hold the blade end using a rag or thickly-padded glove. Remove the blade bolt, curved washer, blade stiffener, and blade from the spindle shaft (Figure 47).

Figure 47

1.	Sail area of blade	4.	Blade bolt
2.	Blade	5.	Blade stiffener

3.Curved washer

Sharpening the Blades

1.Use a file to sharpen the cutting edge at both ends of the blade (Figure 48). Maintain the original angle. The blade retains its balance if the same amount of material is removed from both cutting edges.

Figure 48

1.Sharpen at original angle

2.Check the balance of the blade by putting it on a blade balancer (Figure 49). If the blade stays in a horizontal position, the blade is balanced and can be used. If the blade is not balanced, file some metal off the end of the sail area only (Figure 48). Repeat this procedure until the blade is balanced.

Figure 49

1. Blade 2. Balancer

Installing the Blades

1.Install the blade onto the spindle shaft (Figure 47).

Important: The curved part of the blade must be pointing upward toward the inside of the cutter deck to ensure proper cutting.

2.Install the blade stiffener, the curved washer (cupped side toward the blade) and the blade bolt (Figure 47).

3.Torque the blade bolt to 35-65 ft-lb (47-88 N-m).

Leveling the Cutter Deck from Side-to-Side

The cutter deck blades must be level from side to side. Check the side-to-side level any time you install the cutter deck or when you see an uneven cut on your lawn.

1.Park the machine on a level surface and disengage the blade control switch.

2.Move the motion control levers outward to the park position, stop the engine, remove the key, and wait for all moving parts to stop before leaving the operating position.

3.Check the air pressure of all four tyres. If needed, adjust to the recommended inflation; refer to Checking the Tyre Pressure in the Drive System Maintenance section.

4.Set the height-of-cut lever to position D [3 inch (76 mm)].

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