Operating Your Lawn Mower; Gas And Oil Fill-Up; Starting/Stopping Engine And Blade; Neutral Adjustment Test - Cub Cadet SC 621 Operator's Manual

21-inch, 6-speed lawn mower
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SECTION 5: OPERATING YOUR LAWN MOWER

Gas and Oil Fill-Up

Service the engine with gasoline and oil as
instructed in the accompanying engine manual.
Follow all instructions carefully.
WARNING:
with engine running or until the engine has
been allowed to cool for at least two minutes
after running.
Before Starting
Attach spark plug wire to spark plug. Make certain
the metal cap on the end of the spark plug wire
(inside the rubber boot) is fastened securely over
the metal tip on the spark plug.
Check the drive clutch control for proper
adjustment. If the mower does not propel itself or
the drive wheels hesitate with the drive clutch
engaged, perform the drive clutch control
adjustment as instructed on page 16.
Starting Engine
WARNING:
operator is standing near the lawn mower
while starting engine or operating mower.
Never run engine indoors or in enclosed,
poorly ventilated areas. Engine exhaust
contains carbon monoxide, an odorless and
deadly gas.
Keep hands, feet, hair and loose clothing
away from any moving parts on engine and
lawn mower.
When starting the unit for the first time, face
the mower against a solid object such as a
wall, fence, etc. Start the unit and if it shows
any signs of motion while the drive clutch
control is still disengaged, shut the engine off
immediately.
Make sure that the drive clutch control is adjusted
so the drive belt is as loose as possible.
Push the primer three times. Wait two seconds
between each push. In temperatures below 55° F,
prime five times. Do not prime to restart a warm
engine after a short shutdown.
Standing behind the mower, depress the blade
control handle and hold it against the upper handle.
Grasp starter handle and pull rope out slowly until
engine reaches start of compression cycle (rope
will pull slightly harder at this point). Let the rope
Never fill fuel tank indoors,
Be sure no one other than the
rewind slowly. Pull rope with a rapid, continuous,
full arm stroke. Keeping a firm grip on the starter
handle, let the rope rewind slowly.
Stopping Engine and Blade
Release the blade control handle to stop the engine
and blade.
WARNING:
for a few seconds after the engine is shut off.

Neutral Adjustment Test

To perform this test, answer the following questions
after having started the mower and engaged the
drive clutch control:
1. With the engine OFF and the drive clutch
control released, push mower forward and pull
it backward. Does it move freely?
2. Squeeze drive clutch control and pull the
mower backward. Do rear wheels lock up?
3. Is the drive clutch control cable free of kinks or
sharp bends?
If you answered "yes' to all three questions, your
mower passed the test and you can start your
mower. If you answered "no" to any of the three
questions, you need to perform the "Drive Clutch
Control Adjustment" as instructed on page 13.

Locking Casters

If you are cutting grass on a slope, always
IMPORTANT:
lock the front wheel casters of your mower for straight
ahead operation. On level ground you may leave the
casters unlocked to pivot freely.
Locked
Position
To turn the mower on a slope with casters locked,
depress the upper handle and raise the front
wheels slightly.
To lock caster: Lift and place the lock pin in the
larger hole on each caster. See Figure 10.
10
The blade continues to rotate
Unlocked
Position
Figure 10

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