PTO Mow Circuit Cutting Deck Blade Braking
WhentheoperatorturnsthePTOswitchOFForifadeck
is raised with the PTO switch ON, PTO control manifold
solenoid valve (S) is de--energized causing logic car-
tridge(LC1)toshift(refertoinformationinPTOMowCir-
cuit in this section). This shifted cartridge allows oil
return out manifold port P2. At the same time, solenoid
valve (S) in its neutral position prevents any sense line
flow through the spool which causes the logic cartridge
LC2 to shift to its neutral position blocking return flow
from the deck motor and slowing the cutting blades (Fig.
10).
PTO MANIFOLD
G
M1
P1
RV1
RV2
LC1
DECK
MOTOR
S
LC2
M2
P2
Theinertiaoftherotatingcuttingblades,however,effec-
tively turns the deck motor into a pump causing an in-
crease in pressure as the flow from the motor comes up
againsttheclosedlogiccartridge(LC2).Whenthispres-
sure builds to approximately 600 PSI (41 bar), relief
valve (RV2) opens which allows a small amount of hy-
draulic flow to return to tank through a manifold sensing
line (Fig. 11). This flow causes a pressure increase that
shifts logic cartridge LC2 to once again allow oil flow
from the motor (Fig. 12). When return pressure drops
below 600 PSI (41 bar), relief valve (RV2) reseats and
causes LC2 to close again blocking return flow from the
deckmotortofurtherslowthecuttingblades.Thisaction
of the brake relief valve opening and the logic cartridge
shifting occurs several times in a very short time frame
as the blades finally come to a stop. Once the blades
havestopped, logic cartridge LC2 remains in theneutral
position to keep the deck motor from rotating.
CD
Figure 10
PTO MANIFOLD
G
M1
P1
RV1
RV2
LC1
DECK
MOTOR
S
LC2
M2
P2
CD
Figure 11
PTO MANIFOLD
G
M1
P1
RV1
RV2
LC1
DECK
MOTOR
S
LC2
M2
P2
CD
Figure 12
Hydraulic System
Page 4 -- 20
Groundsmaster 4000--D
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 30412, Toro Groundsmaster 4000 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 |
| Document File Type | |
| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
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