Walker MC (20 HP) - Manual (Page 44)

Operating Instructions
40
NOTE: An optional exhaust screen with larger
holes (3/4”) is available for use when mowing in wet
grass; the screen provides less airflow restriction
and more clog resistance (use standard screen in
dry conditions to avoid excessive material blowing
out of the catcher).
Remember, anything that restricts airflow or mate-
rial flow along the entire path from the mower deck
to the grass catcher can cause clogging.
Using the Tilt-Up Deck
Refer to CLEANING of Grass Buildup in Mower
Housing in Maintenance Instructions.
Using the GHS Catcher
Powerfil ®
The GHS catcher has an oscillating grass delivery
spout (POWERFIL ® ) which is designed to spread
grass clippings throughout the interior of the grass
catcher (even when mowing wet, heavy grass). The
oscillating action may be checked by turning the
ignition switch to the ON position and moving the
blade clutch to the ENGAGED position. The spout
should oscillate approximately 25 cycles per min-
ute.
NOTE: If the grass spout fails to oscillate, the clutch
switch should be checked for function (the switch
closure is adjustable).
“Full” Signal Horn
The GHS catcher has a “full” signal horn to alert
the operator to dump the catcher when it is full (to
prevent overfilling and clogging). The “full” signal
horn is activated by a vane switch (Grass-Pak ®
switch) mounted on the grass delivery spout. Oscil-
lating action of the spout triggers the vane switch as
grass begins to fill in around the spout when the
catcher is almost full.
The “full” signal function may be checked by turning
the ignition switch ON, engaging the blade clutch
(engine not running), opening the catcher back door,
and triggering the Grass-Pak ® vane by hand as it
oscillates. The horn should sound as the switch is
moved in both directions.
WARNING
DO NOT test the Grass-Pak ® switch with
the engine running. Projectiles may be
thrown out of the grass delivery spout, and
COULD cause serious injury.
The “full” signal horn is designed to operate (sound)
when the grass catcher is almost full. The timing
of the signal is adjustable by changing the position
of the vane on the Grass-Pak ® switch. If the signal
is coming on too soon (catcher not completely full)
or too late (grass clogging in catcher spout and
deliv ery chute), refer to ADJUSTMENTS for GHS
Signal Horn Adjustment in Maintenance Instructions.
NOTE: The horn signal should be adjusted to
sound BEFORE the catcher is completely full to
give the operator time to react and stop mowing. An
indication the horn signal is coming on too late (de-
layed too much) is if grass clippings are falling out of
the grass catcher delivery chute when the catcher is
dumped.
Cleaning the GHS Exhaust Screen
To remove the grass catcher screen for cleaning,
open the catcher door, push forward and pull down
on the grass catcher screen knobs (on either side of
the screen), and slide the screen out. Use a high
pressure washer or water spray and brush to clean
the screen.
Keeping the catcher exhaust screen clean and open
is essential to good performance of the catching
system. In some mowing conditions, e.g., wet and
dirty, it will be necessary to clean the screen fre-
quently to avoid clogging the mower deck, blower,
and chutes due to airflow restriction.
Grass Catcher
Screen
Removal Knobs
(Not Visible)
Grass Catcher Screen Removal for Cleaning