Operating Procedures
Mower Deck Operation
4
4-6 425HD-MD/masterdoc101602 Operating Procedures
4.6 Mower Deck Operation
The Model 425HD-MD Articulator is equipped with a 96" wide mower deck, which is com-
prised of four independently articulating 25" decks. All four decks are belt driven - the
drive belt (located under the operator seat pan between the gearbox and the main deck)
drives the main deck, and the deck belts (running between the decks) drive each deck.
The individual decks pivot at blade level, and the idler belt tension system takes up
excess belt length or releases additional belt length as necessary during the up and down
articulation of the decks. This allows the Articulator to hold the contour of the ground with
precision.
Refer to the Initial Set-Up section of this manual for instructions on setting the mower
deck height to the desired level.
The Model 425HD-MD Articulator is equipped with an electric clutch which activates the
gearbox, thus engaging the blades of all four decks simultaneously. The blades may only
be engaged while the engine is running.
In order to engage the blades, the operator present switch (located within the operator
seat) must be activated. The activation of the operator present switch is indicated by the
operator present light located on the control panel just above the key switch.
From the operator seat, switch the BLADES toggle switch (located in the center of the
main control panel, above the headlight and hazard light toggle switches) to the START
position. It is a MOMENTARY SWITCH - you may release it immediately upon activation
of the clutch. The blades will engage slowly, and gradually increase in speed until the
maximum RPM is reached.
Leaving the operator seat at any time while the blades are engaged will cause the blades
to automatically disengage.
ALWAYS clear area of all personnel before engaging the blades!
ALWAYS verify that all safety covers are in place before operating the
Articulator!
NEVER discharge in the direction of bystanders, vehicles, or buildings!
ALWAYS stay well clear of blades during operation!
NEVER operate the Articulator when children are present!
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