Toro 01088SL Rev F Service Manual Groundsmaster 3500 D Preface Publication

Cutting Unit Circuit
Mow
Cutting Unit Blade Braking
Thegearpump(P1)isdirectlycoupledtothethehydros-
tat which is driven by the engine. Taking its suction di-
rectly  from  the hydraulic  tank,  the  gear  pump (P1)
supplies oil flow to the manifold block and to the cutting
unit motors.
When the solenoid valve  (R1) is de--energized as the
PTO  switch is  DISENGAGED,  brake relief  cartridge
(BV) shifts  to its closed  position, blocking return  flow
from the deck motors and slowing the cutting blades
Theinertiaoftherotatingcuttingblades,however,effec-
tively turns the deck motors into pumps causing an in-
crease in pressure as the flow from the motors comes
up against the closed brake relief cartridge (BV). When
this pressure  builds to  approximately 1500  PSI (103
bar), brake relief cartridge (BV) opens which allows hy-
draulic flow to return to  tank and reduces return pres-
sure. When return pressure drops below 1500 PSI (103
bar), brake relief cartridge (BV) reseats to further slow
the cutting blades. This action repeats several times in
a very short time frame as the blades finally come to a
stop. Once the blades  have stopped, brake relief car-
tridge(BV)remainsclosedtokeepthedeckmotorsfrom
rotating.
Solenoid valve  (R1) is  de--energized with the  engine
running when either  the cutting unit  drive switch is in
DISENGAGE or the transport/mow slide is in TRANS-
PORT.Solenoidvalve(R1)by--passesflowfromthecut-
ting unit motors directly to the hydraulic reservoir.
Solenoid valve (R1) is  energized with the engine run-
ning when the cutting  unit drive switch is in ENGAGE
and the  transport/mow slide  is in MOW.  When ener-
gized, solenoid valve (R1) allows gear pump (P1) flow
out manifold block  port M1 to the  cutting unit motors.
When solenoid valve (R1) is energized, brake relief car-
tridge (BV) is shifted (opens) to allow oil return from the
cutting unit motors.
Oil flows through the left, right, and then rear cutting unit
motors as it turns the motors. The oil then returns into
manifold block port (M2), the oil cooler, the oil filter and
to gear pump (P1) inlet.
If cutting unit circuit pressure exceeds relief pressure of
3200
PSI (221 bar), solenoid valve (R1) shifts to allow
circuit pressure relief.
Groundsmaster 3500--D
Page 4 -- 13    Rev. F
Hydraulic System (Rev. D)
Product Specification
CategoriesLawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals
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- 256 pages
Document TypeCatalog
LanguageEnglish
Product BrandToro. 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)
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