Mow Circuit Cutting Deck Blade Braking
When the operator turns the PTO switch OFF or if the
decks are raised with the PTO switch ON, the deck con-
trol manifold proportional relief valves (PRV1 and
PRV2) are de--energized causing circuit flow to bypass
the deck motors and return to the reservoir out manifold
portT(refertoinformationinMowCircuitinthissection).
Without circuit flow, the manifold relief valve (RV1 or
RV2)returnstoitsneutralpositionwhichcausesthelog-
ic cartridge (LC1 or LC2) to shift to its neutral position,
blocking return flow from the deck motors and slowing
the cutting blades (Fig. 13).
FROM
GEAR
PUMP
ORIFICE
Theinertiaoftherotatingcuttingblades,however,effec-
tively turns the deck motors into pumps causing an in-
crease in pressure as the flow from the motor comes up
against the closed logic cartridge (LC1 or LC2). When
this pressure builds to approximately 1500 PSI (105
bar), the relief valve (RV1 or RV2) re--opens which al-
lows a small amount of hydraulic flow to return to tank
through a manifold sensing line (Fig. 14). This flow
causes a pressure differential that shifts the logic car-
tridge (LC1 or LC2) to once again allow oil flow from the
motors (Fig. 15). When return pressure drops below
FROM
DECK
CONTROL
MANIFOLD
FRONT
MOW
TO
OIL
CIRCUIT
COOLER
Figure 13
FROM
GEAR
PUMP
1500
PSI (105 bar), the relief valve (RV1 or RV2) re-
seats and causes the logic cartridge (LC1 or LC2) to
close again, blocking return flow from the deck motors
to further slow thecutting blades.This actionoftherelief
valve opening and the logic cartridge shifting occurs
several times in a very short time frame as the blades fi-
nally come to astop. Once the blades have stopped, the
logic cartridge (LC1 or LC2) remains in the neutral posi-
tion to keep the deck motors from rotating.
ORIFICE
FROM
DECK
CONTROL
MANIFOLD
FRONT
MOW
TO
OIL
COOLER
CIRCUIT
Figure 14
FROM
GEAR
PUMP
ORIFICE
FROM
DECK
CONTROL
MANIFOLD
FRONT
MOW
TO
OIL
COOLER
CIRCUIT
Figure 15
Groundsmaster 4300--D
Hydraulic System
Page 4 -- 14
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 4300 D |
| Download File |
|
| Document Type | Catalog |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
Monday - Friday 7:30 a.m. to 9:00 p.m. (CDT) - Saturday 8:00 a.m. to 8:00 p.m. (CDT) - Sunday 10:00 a.m. to 8:00 p.m. (CDT)
Canada 1-888-225-4886 USA 1-888-384-9939, Lawn Mower |
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| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
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