Walker MC (20 HP) - Manual (Page 43)

Operating Instructions
39
Clogging Checklist
In case of clogging, there will be a distinct change
in the sound of the blower, i.e., the blower sound
will stop. Also, the mower deck will begin to leave a
trail of grass clippings. When this occurs, stop the
engine, disconnect the spark plug wires, and make
sure all movement has stopped before attempt-
ing to unclog.
DANGER
NEVER place hands under the mower deck
or in the GHS blower discharge chute.
Use a stick or similar tool to remove any
clogged material.
Normally, any clogging will first develop at the back
of the mower deck in the discharge opening into the
blower chute. Clogging at this point does not indi-
cate a particular problem in this part of the sys-
tem, but is a symptom of something restrict ing
the flow of material throughout the entire system.
The following list of items should be checked if a
pattern of clogging begins to develop. All of these
items are capable of causing clogging at the back of
the deck.
• Check to see if the RH and LH mower blades are
installed for the correct rotation - install blades so
the cutting edges move toward each other.
FORWARD
Blades Must Operate at
Right Angles (90 Degrees)
Mounting Nut
Torque = 60 ft-lb
(81.3 N·m)
Rear Discharge
Chute
Blade Rotation for GHS Mower Deck
(View from Underneath)
•
Check the amount of flat section remaining at
blade tip. This is the area that is ground away (re-
moved) when the blades are sharpened. If too much
of the flat section is removed, the “air lift” perfor-
mance or “shovel” effect of the blade deteriorates to
the point that discharge of grass clippings into the
blower chute is marginal. Replace cutter blades if
less than 3/4 in. (19 mm) flat section remains at the
blade tip.
• Check that the interior of the deck housing and
baffling is reasonably clean and free of grass and
dirt buildup. While some degree of material buildup
can be tolerated, a point is finally reached where the
flow of air and grass clippings is restricted.
NOTE: One condition that quickly causes a buildup
of material in the deck housing is mowing grass and/
or weeds which are “juicy.” The material collects
under the deck with sticky, green juice. Clo ver and
weeds are especially a problem. The mower deck
will need to be cleaned frequently when operating in
these conditions.
• Check the deck cutting height setting. When
working in thick, tall grass, lower deck settings
[1 to 2 in. (25 to 51 mm) cutting heights] tend to
restrict airflow from moving into and under the deck.
Raising the deck cutting height will signifi cantly
increase airflow and reduce clogging when working
in thick, tall grass.
• Check the interior of the chute connecting the
mower deck to the blower for smoothness and
freedom from obstruction.
•
Check the blower wheel for bent blades and
excessive clearance between the blade tip and
the blower housing. A clearance greater than
1/8 in. (3 mm) will cause a significant loss of
blower performance.
• Check the blower discharge chute into the grass
catcher for smoothness and freedom from ob-
struction.
• Check the elbow inside the grass catcher for a
buildup of material in the radius of the elbow. In
certain conditions (damp/dirty grass) a considerable
“clump” of material can accumulate at this point,
greatly restricting material and airflow.
• Check that the openings in the removable air
exhaust screen in the grass catcher are not
plugged. If the screen is clogged, refer to Cleaning
the GHS Exhaust Screen in this section.