Inspecting The Rotor Blades; Changing The Engine Oil - Toro Power Clear 621 QZR Operator's Manual

Note: Moving the Z-fitting higher decreases the gap
between the control bar and the handle; moving it
lower increases the gap.
3. Hook the spring to the adjuster link and slide the spring
cover over the adjuster link.
4. Check the adjustment; refer to Checking the Control
Cable.
Note: After extended use, the drive belt may wear
and lose its proper belt tension. If the drive belt slips
(continuously squeals) under a heavy load, disconnect
the spring from the adjustor link and move the upper
end of the spring to the hole that is further from
the pivot point in the control bar (Figure 28). Then
connect the spring to the adjustor link and adjust the
control cable.
1. Remove the upper end of
spring from this hole
2. Insert the upper end of
spring into this hole
Note: The belt may slip (squeal) in wet conditions;
to dry out the drive system, start the rotor and run it
without a load for 30 seconds.

Inspecting the Rotor Blades

Service Interval: Yearly—Inspect the rotor blades and have
an Authorized Service Dealer replace the
rotor blades and scraper if necessary.
Before each session, inspect the rotor blades for wear. When
a rotor blade edge has worn down to the wear indicator hole,
have an Authorized Service Dealer replace the rotor blades
and the scraper (Figure 29).
Figure 28
3. Pivot point
4. Upper end of spring
1. The wear indicator hole is
intact; you do not need to
replace the rotor blades.

Changing the Engine Oil

Service Interval: After the first 2 hours
Yearly
Run the engine a few minutes before changing the oil to warm
it. Warm oil flows better and carries more contaminants.
1. Siphon the fuel from the fuel tank into an approved
fuel container, or run the engine until it stops.
2. Move the machine to a level surface.
3. Place an oil drain pan under the oil drain plug, remove
the oil drain plug, and tip the machine backward and
drain the used oil in the oil drain pan Figure 30).
4. After draining the used oil, return the machine to the
operating position.
5. Install the oil drain plug and tighten it securely.
6. Clean around the oil fill cap (Figure 31).
15
Figure 29
2. The wear indicator hole is
exposed; replace the rotor
blades.
Figure 30