Cleaning The Cooling System - Toro 74175 Operator's Manual

Maintenance
Sharpening the Blades
1. Use a file to sharpen the cutting edge at both
ends of the blade (Fig. 20). Maintain the original
angle. The blade retains its balance if the same
amount of material is removed from both cutting
edges.
1
Figure 20
1. Sharpen at original angle
2. Check the balance of the blade by putting it on a
blade balancer (Fig. 21). 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 (Fig. 19).
Repeat this procedure until the blade is balanced.
1
Figure 21
1. Blade
Installing the Blades
1. Install the blade onto the spindle shaft (Fig. 19).
IMPORTANT: The curved part of the blade
must be pointing upward toward the inside of
the mower to ensure proper cutting.
2. Install the flat washer, lock washer and blade
bolt (Fig. 19). Torque the blade bolt to 85–110
ft-lb (115–150 N m).
38
m–1854
2
m–1855
2. Balancer

Cleaning the Cooling System

Clean the air intake screen from grass and debris
befor each use.
Clean cooling fins and engine shrouds every 300
hours or yearly, which ever comes first.
1. Stop the engine, set the parking brake, remove
the key and disconnect the spark plug wire(s)
from the spark plug(s).
2. Remove air–intake screen, air cleaner cover, fan
housing and bolts (Fig. 22).
3. Clean debris and grass from engine shrouds and
cooling fins.
4. Reinstall air–intake screen, air cleaner cover, fan
housing and bolts. Install bolts to 4.3 ft–lb (5.9
N–m) torque (Fig. 22).
1
5
3
Figure 22
1. Air–intake Screen
2. Fan Housing
3. Air Cleaner Cover
4
5
2
6
5
m–4369
4. M6 x 10mm Bolt
5. M6 x 12m Bolt
6. M6 x 20mm Bolt