Cleaning The Cooling System; Servicing The Air Cleaner - Toro 74179 Operator's Manual

Installing the Blades
1. Install the blade onto the spindle shaft (Fig. 28).
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. 28). Torque the blade bolt to 85–110 ft-lb
(115–150 N m).

Cleaning the Cooling System

Clean the air intake screen from grass and debris before
each use.
Clean the 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 the air intake screen, air cleaner cover, fan
housing, and bolts (Fig. 31).
3. Clean debris and grass from the engine shrouds and
cooling fins.
4. Reinstall the air intake screen, air cleaner cover, fan
housing, and bolts (Fig. 31). Torque the bolts to 4.3 ft-lb
(5.8 N m).
1
5
3
Figure 31
1. Air intake screen
2. Fan housing
3. Air cleaner cover

Servicing the Air Cleaner

Primary Filter: Check and/or replace after every 200
operating hours or more often in dusty conditions.
4
5
2
6
5
m–4369
4. M6 x 10mm bolt
5. M6 x 12mm bolt
6. M6 x 20mm bolt
29
Safety Filter: Replace after every 600 operating hours.
Note: Check the filters more frequently if operating
conditions are extremely dusty or sandy.
Removing the Filters
1. Disengage the power take off (PTO), set the parking
brake, and turn the ignition key to off. Remove the key.
Remove spark plug wire(s).
2. Release the latches on the air cleaner and pull the air
cleaner cover off of the air cleaner body (Fig. 32).
3. Clean the inside of the air cleaner cover with
compressed air.
4. Gently slide the primary filter out of the air cleaner
body (Fig. 32). Avoid knocking the filter into the side of
the body.
5. Remove the safety filter only if you intend to replace
it.
Important Never attempt to clean the safety filter. If
the safety filter is dirty, then the primary filter is damaged
and you should replace both filters.
6. Inspect the primary filter for damage by looking into
the filter while shining a bright light on the outside of
the filter. Holes in the filter will appear as bright spots.
If the filter is damaged discard it.
5
2
Figure 32
1. Latches
2. Air cleaner cover
3. Air filter body
3
4
1
1
m–4815
4. Primary filter
5. Safety filter