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Sharpening the Blades
1. Use a file to sharpen the cutting edge at both ends
of the blade (Figure 76). Maintain the original angle.
The blade retains its balance if the same amount of
material is removed from both cutting edges.
Figure 76
1. Sharpen at original angle
2. Check the balance of the blade by putting it on a
blade balancer (Figure 77). 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 74). Repeat this
procedure until the blade is balanced.
Figure 77
1. Blade
Installing the Blades
1. Install the blade onto the spindle shaft (Figure 74).
Important: The sail part of the blade must be
pointing upward, toward the inside of the mower
to ensure proper cutting (Figure 74).
2. For 40 inch and 48 inch mower decks, install the
blade, curved washer, and blade bolt (Figure 74).
3. For 36 inch and 52 inch mower decks, install the
blade, stiffener, curved washer, and blade bolt
(Figure 75).
4. Torque the blade bolt to 85-110 ft-lb (115-140 N-m).
2. Balancer
Correcting the Mower Quality
of Cut
If one deck blade cuts lower than the other, correct as
follows.
Note: Tire air pressure is critical in these procedures.
Make sure all tires have correct pressure.
1. Disengage the PTO and set the parking brake.
2. Stop the engine, remove the key, and wait for all
moving parts to stop before leaving the operating
position. Disconnect the spark plug wire(s) from
the spark plug(s).
3. Adjust the tire pressure in the rear tires to
specifications; refer to Drive System Maintenance
, page 35 .
4. Check that the blades and spindle shafts are not
bent. Refer to Checking for Bent Blades.
5. Set the height-of-cut to the 4 inch (101.6 mm)
position. Refer to Adjusting the Height-Of-Cut in
Operation , page 13.
6. Perform the steps in the following sections Frame
Set Up, Checking Front-to-Rear Pitch, and Checking
Side-to-Side Leveling.
Frame Set Up
Checking the Carrier Frame and Engine
Deck Alignment
Note: Misalignment can cause excess wear on the PTO
drive belt.
1. Disengage the PTO and set the parking brake.
2. Stop the engine, remove the key, and wait for all
moving parts to stop before leaving the operating
position.
3. Place a long straight edge on top of the engine deck
as shown in Figure 78.
4. At the carrier frame cross channel, measure the
height at location A (Figure 78). This measurement
must be 1-5/16 inch (33 mm), plus or minus a 1/4
inch (6 mm).
5. If the height at location A is not correct, adjustment
is needed.
6. Loosen the carrier frame mounting bolts on both
sides of the machine (Figure 78).
7. Align the carrier frame and engine deck to match
1-5/16 inch (33 mm), plus or minus a 1/4 inch (6
mm) at location A (Figure 78).
8. Tighten the carrier frame mounting bolts on both
sides of the machine.
53
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