100in Rear Discharge Deck

You can change the height of cut on the center deck by moving the stop pin into different hole locations.

1. With the engine running, push back on the mower lift switch until the mower is fully raised and release the switch immediately.

2. Rotate the stop pin until the nub on it lines up with the slots in the holes in the height-of-cut bracket and remove it (Figure 7).

   

   Figure 7

   1. Stop pin

3. Select a hole in the height-of-cut bracket corresponding to the height of cut desired, insert the pin, and rotate it down to lock it in place (Figure 7).

   Note: There are 4 rows of hole positions (Figure 7). The top row gives you the height of cut listed above the pin. The second row down gives you the height listed plus 6 mm (1/4 inch). The third row down gives you the height listed plus 12 mm (1/2 inch). The bottom row gives you the height listed plus 18 mm (3/4 inch). For the 127 mm (5 inch) position there is only 1 hole, located in the second row. This does not add 6 mm (1/4 inch) to the 127 mm (5 inch) position.

4. Adjust the anti-scalp rollers and skids as required.

Adjust the height of cut on the wing decks by positioning the caster wheel axles in the upper or lower holes of the caster forks, adding or removing an equal number of spacers from the caster forks, and securing the height-of-cut collar to the desired holes in the height-of-cut rod.

1. Start the engine and raise the cutting unit off the floor so that you can adjust the height of cut. Shut off the engine, set the parking brake, and remove the key after you raise the cutting unit.

2. Position the caster wheel axles in the same holes in both caster forks. Refer to Figure 8 to determine the correct holes for the setting.

   

   Figure 8

   1. Tensioning cap
   2. Spacers
   3. Shims
   4. Axle mounting holes
   5. Caster wheel

   Note: When operating in a 64 mm (2-1/2 inch) cutting height or higher, install the axle bolt in the lower caster fork hole to prevent grass buildup between the wheel and the fork. When operating in a cutting height lower than 64 mm (2-1/2 inch) and there is grass buildup, reverse the machines direction to pull any clippings away from the wheel/fork area.

3. Remove the tensioning cap from the spindle shaft (Figure 8) and slide the spindle out of the caster arm. Put the 2 shims (3 mm or 1/8 inch) onto the spindle shaft as they were originally installed. These shims are required to achieve a level across the entire width of the cutting units. Slide the appropriate number of 13 mm (1/2 inch) spacers onto the spindle shaft to get the desired height of cut; then slide the washer onto the shaft.

   Note: When using 25 mm (1 inch), 38 mm (1-1/2 inch), or occasionally 51 mm (2 inch) height of cut, move the skids and roller to the highest holes.

4. Secure the adjustment with the tensioning cap.

Cutting unit pitch is the difference in height of cut from the front of the blade plane to the back of the blade plane. Toro recommends a blade pitch of approximately 8 to 11 mm (5/16 to 7/16 inch). This means that the back of the blade plane is 8 to 11 mm (5/16 to 7/16 inch) higher than the front.

1. Park the machine on a level surface on the shop floor.

2. Set the cutting unit to the desired height of cut, move the throttle lever to the SLOW position, shut off the engine, engage the parking brake, and remove the key.

3. Rotate the center blade so that it points straight forward.

4. Using a short ruler, measure from the floor to the front tip of the blade.

5. Rotate the same blade tip to the rear and measure from the floor to the tip of the blade at the rear of the mower.

6. Subtract the front dimension from the rear dimension to calculate the blade pitch.

7. Adjust the U-bolt jam nuts (Figure 13) securing the rear deck chains (Figure 14) to the mower deck to raise the rear of the mower so that the blade pitch is set to 8 to 11 mm (5/16 to 7/16 inch).

   

   Figure 13

   1. U-bolt
   2. Jam nut
   

   Figure 14

   1. Left rear-lift chain
   2. Right rear-lift chain

If the cut is uneven across the mower swath, correct it as follows:

1. Park the machine on a level surface on the shop floor.

2. Set the cutting unit to the desired height of cut, move the throttle lever to the SLOW position, shut off the engine, engage the parking brake, and remove the key.

3. Check and adjust front and rear tractor tire pressure; refer to the traction unit Operator’s Manual.

4. Check for bent blades.

5. Remove the covers from the top of the cutting units.

6. Rotate the blade on each spindle until the ends face forward and backward.

7. Measure from the floor to the front tip of the cutting edge.

8. Adjust the jam nuts securing the deck chains to the mower deck until the mower deck is level (Figure 14).

To maintain enough power for the machine and deck while mowing, operate the engine at the fast throttle position and adjust your ground speed for conditions. Decrease the ground speed as the load on the cutting blades increases, and increase the ground speed as the load on the blades decreases.

Alternate the mowing direction to avoid making ruts in the turf over time. This also helps disperse clippings, which enhances decomposition and fertilization.

To improve cut quality, use a slower ground speed.

Remove approximately 25 mm (1 inch) or no more than 1/3 of the grass blade when cutting. In exceptionally lush and dense grass, you may have to slow down the forward speed and/or raise the height of cut to the next higher setting.

Clean clippings and dirt from the underside of the mower after each use. If grass and dirt build up inside the mower, cutting quality will eventually become unsatisfactory.

To reduce the risk of fire hazard, keep the engine, muffler, battery compartment, parking brake, cutting units, and fuel storage compartment free of grass, leaves, or excessive grease. Clean up any spilled oil or fuel.

Use compressed air or a leaf blower to clean the belt drive area. Install any removed guards or covers after cleaning.

Maintain a sharp blade throughout the cutting season because a sharp blade cuts cleanly without tearing or shredding the grass blades. Tearing and shredding, which turns grass brown at the edges, slows growth and increases the chance of disease. Check the blades daily for sharpness, and for any wear or damage. Sharpen the blades as necessary. If a blade is damaged or worn, replace it immediately with a genuine Toro replacement blade. Refer to Servicing the Cutting Blades.

1. Park the machine on a level surface.

2. Lower the mower deck to the 2.5 cm (1 inch) height of cut.

3. Disengage the PTO, release the traction pedal, and engage the parking brake.

4. Move the throttle lever to the SLOW position, stop the engine, remove the key, and wait for all moving parts to stop before leaving the operating position.

5. Lift the footrest, exposing the top of the mower deck.

6. Remove the dipstick/fill plug from the top of the gearbox (Figure 24) and make sure that the lubricant is between the marks on the dipstick.

   

   Figure 24

   1. Fill plug and dipstick
   2. Drain location

7. If the lubricant level is low, add enough lubricant until the level is between the marks on the dipstick.

   Important: Do not overfill the gearbox and operate the mower deck; otherwise, you may damage the gearbox.

1. Park the machine and cutting unit on a level surface.

2. Lower the mower deck to the 2.5 cm (1 inch) height of cut.

3. Disengage the PTO, release the traction pedal, and engage the parking brake.

4. Move the throttle lever to the SLOW position, shut off the engine, remove the key, and wait for all moving parts to stop before leaving the operating position.

5. Lift the footrest to expose the top of the mower deck.

6. Remove the dipstick/fill plug from the top of the gearbox (Figure 24).

7. Place a drain pan under the drain plug located under the front of the gearbox and remove the plug, draining the lubricant into the pan.

8. Replace the drain plug.

9. Add enough lubricant, approximately 414 ml (14 fl oz), until the level is between the marks on the dipstick.

   Important: Do not overfill the gearbox and operate the mower deck; otherwise, you may damage the gearbox.

1. Disengage the PTO, release the traction pedal, and engage the parking brake.

2. Move the throttle lever to the SLOW position, stop the engine, remove the key, and wait for all moving parts to stop before leaving the operating position.

1. Disengage the PTO, release the traction pedal and engage the parking brake.

2. Move the throttle lever to the SLOW position, shut off the engine, remove the key, and wait for all moving parts to stop before leaving the operating position.

3. Rotate the blades until the ends face forward and backward (Figure 29).

   

   Figure 29

   1. Position A
   2. Measure here from blade to hard surface

4. Measure from a level surface to the cutting edge, position A, of the blades (Figure 29). Note this dimension.

5. Rotate the opposite ends of the blades forward.

6. Measure from a level surface to the cutting edge of the blades at the same position as in step 3 above. The difference between the dimensions obtained in steps 3 and 4 must not exceed 3 mm (1/8 inch). If this dimension exceeds 3 mm (1/8 inch), the blade is bent and must be replaced; refer to Checking for Bent Blades and Removing and Installing the Blade(s).

   Warning

   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.

The blade must be replaced if a solid object is hit, the blade is out-of-balance, worn, or bent. Always use genuine Toro replacement blades to ensure safety and optimum performance. Never use blades made by other manufacturers because they could be dangerous.

1. Raise the cutting unit to the highest position, engage the parking brake, stop the engine, and remove the ignition key. Block the cutting unit to prevent it from accidentally falling.

2. Grasp the end of the blade using a rag or thickly padded glove. Remove the blade bolt, anti-scalp cup, and blade from the spindle shaft (Figure 30).

   

   Figure 30

   1. Blade bolt
   2. Anti-scalp cup

3. Install the blade-sail facing toward the cutting unit-with the anti-scalp cup and blade bolt. Tighten the blade bolt to 115 to 149 N∙m (85 to 110 ft-lb).

   Important: The curved part of the blade must point toward the inside of the cutting unit to ensure proper cutting.

Both cutting edges and the sail, which is the turned up portion opposite the cutting edge, contribute to a good quality-of-cut. The sail is important because it pulls grass up straight, thereby producing an even cut. However, the sail will gradually wear down during operation, and this condition is normal. As the sail wears down, the quality-of-cut will degrade somewhat, although the cutting edges are sharp. The cutting edge of the blade must be sharp so that the grass is cut rather than torn. A dull cutting edge is evident when the tips of the grass appear brown and shredded. Sharpen the cutting edges to correct this condition.

1. Park the machine on a level surface. Raise the cutting unit, engage the parking brake, put the traction pedal in neutral, put the PTO lever in the OFF position, shut off the engine, and remove the key.

2. Examine the cutting ends of the blade carefully, especially where the flat and curved parts of the blade meet (Figure 31). Since sand and abrasive material can wear away the metal that connects the flat and curved parts of the blade, check the blade before using the machine. If you see wear (Figure 31), replace the blade; refer to Removing and Installing the Blade(s).

   

   Figure 31

   1. Cutting edge
   2. Curved area/sail
   3. Wear/slot forming
   4. Crack

   Warning

   If the blade is allowed to wear, a slot will form between the sail and flat part of the blade (Figure 31). Eventually, a piece of the blade may break off and be thrown from under the housing, possibly resulting in serious injury to yourself or bystanders.

   • Inspect the blade periodically for wear or damage.

   • Replace a worn or damaged blade with a new Toro blade to ensure continued safety certification of the product.

3. Examine the cutting edges of all blades. Sharpen the cutting edges if they are dull or nicked. Sharpen only the top side of the cutting edge and maintain the original cutting angle to ensure sharpness (Figure 32). The blade will remain balanced if the same amount of metal is removed from both cutting edges.

   

   Figure 32

   1. Sharpen at original angle

   Note: Remove the blades and sharpen them on a grinder; refer to Removing the Cutting Blades. After sharpening the cutting edges, install the blade with the anti-scalp cup and blade bolt. The blade sails must be on top of the blade. Tighten the blade bolt to 115 to 149 N·m (85 to 110 ft-lb).