Troy-Bilt 1900678 - Manual (Page 36)

BLADE BRAKE CONTROL TEST
PROCEDURE!
The Blade Brake Control mechanism stops the mower
blade within 3 seconds of release of the Blade Control
Handle. The Blade Brake Control on your TUFF-CUT®
Mower is designed to operate properly for the life of the
mower. However, because the control is a mechanical
device which is subject to wear and exposure to the
elements, the following test procedure should be per­
formed to ensure that the Blade Brake Control is func­
tioning properly. The test should be performed according
to the foliowing schedule:
• At the start of each season.
• At minimum, after every 10 hours of operation.
• After every blade belt adjustment or replacement.
• After every replacement of the blade brake band.
H
CAUTION: To avoid personal injury or prop­
erty damage, make sure that the mower is
on grass, and the test area is clear of foreign ob­
jects and bystanders, before you begin the Blade
Brake Test.
Because the engine is running during the test, the
procedure must be performed outdoors.
TEST:
Step 1: Start the engine as described on Page 19.
Step 2: Engage the blade drive by squeezing the Blade
Control Handle against the handlebar grip and push­
ing the Blade Control forward until a distinct “click” is
heard. Listen for the sound of air movement produced
by the blade. Air movement noise indicates that the blade
is engaged and is rotating.
Step 3: Release the Blade Control Handle. Note a soft
“bang” (caused by the brake band wrapping tightly
against the blade pulley and drum).
Step 4: The blade should stop within 3 seconds. You
will know that the blade has stopped because air move­
ment noise will cease. If not, stop the engine and dis­
connect the spark plug wire. Move the wire away from
the spark plug to prevent accidental starting. Do not
operate the mower until it has been inspected, adjusted
or repaired. See the Troubleshooting Section, Page 36
for possible solutions if the Blade Brake Control System
is not operating properly.
Step 5: If the blade stops within 3 seconds, no imme­
diate service for the Blade Brake Control System is
needed.
O
WARNING: To avoio personal injury, never
run the engine in an enclosed or poorly
ventilated area. Engine exhaust contains carbon
monoxide, an odorless and deadly gas.
BLADE CONTROL HANDLE
BLADE CONTROL
Photo 5-31: Controls used in Blade Brake Control Test.
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