Cutting Deck Blade Braking
When the operator turns the cutting decks OFF, propor-
tional relief valve (PRV) shift occurs in the deck control
manifold (Fig. 15). This shifted valve allows oil return to
the oil cooler and gear pump. Hydraulic pressure is re-
duced to the cutting deck motors which begins to slow
the cutting blades and also allows the manifold relief
valve (RV) to shift.
FROM
DECK
TO OIL
COOLER
MOTORS
ORIFICE
The inertia of the rotating cutting blades increases pres-
sure of the oil return to the deck control manifold. This
pressure increase along with the orifice in the manifold
and the shifted relief valve (RV) cause logic cartridge
(LC1) to shift (Fig. 16). The oil from the deck motors is
finallydirectedthroughtheorificeandtoreliefvalve(RV)
which bleeds the residual pressure in the circuit and al-
lows the blades to stop in a controlled manner (Fig. 17).
TO DECK
MOTORS
FROM
GEAR
PUMP
Figure 15
FROM
DECK
TO OIL
COOLER
MOTORS
ORIFICE
TO DECK
MOTORS
FROM
GEAR
PUMP
Figure 16
FROM
DECK
MOTORS
TO OIL
COOLER
ORIFICE
TO DECK
MOTORS
FROM
GEAR
PUMP
Figure 17
Hydraulic System (Rev. A)
Page 4 -- 16
Groundsmaster 4500--D/4700--D
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