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.
13).
PUMP FLOW
RETURN
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. 14). This flow causes a pressure increase that
shifts logic cartridge LC2 to once again allow oil flow
from the motor (Fig. 15). 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.
Figure 13
Figure 14
Figure 15
PUMP FLOW
RETURN
PUMP FLOW
RETURN
Hydraulic System
Page 4 -- 24
Groundsmaster 5900/5910
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 5900, Toro Groundsmaster 5910 |
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|
| Document Type | Service Manual |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
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| Wikipedia's Page | Toro Company |
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