Groundsmaster 4100--D/4110--D Hydraulic SystemPage 4 -- 19
Mow Circuit
A four section gear pump is coupled to the piston (trac-
tion)pump.Hydraulicflowforthemowcircuitissupplied
by two sections of the gear pump. The gear pump sec-
tion closest to the piston (traction) pump supplies hy-
draulicflowtothewingcuttingdecks,whilethenextgear
pump section supplies the center cutting deck.
Each cutting deck section is controlled by a hydraulic
manifoldequippedwith a solenoid control valve (S), by-
pass cartridge (LC1), brake cartridge (LC2) and two (2)
reliefcartridges(RV1andRV2).Circuitpressurecanbe
measured at port (G) of the hydraulic manifold for each
cutting deck.
NOTE: To engage the mow circuit, the operator must
beinthe operator seat, the cutting deck(s) must befully
lowered and the traction speed must be in the Low
speed (4WD) position.
PTO Not Engaged
Whenthe PTOswitch is OFF or ifthedeck or wingdeck
is raised with the PTOswitch ON, the PTO manifold so-
lenoidvalve (S) is not energized andthe solenoid spool
is in the neutral position. This solenoid spool in neutral
allows a small amountof hydraulic flow to return to tank
through a manifold sensing line which causes a pres-
sure increase that shifts bypass cartridge LC1. The
pump flow is routed through shifted LC1 and out man-
ifold port P2. Brake cartridge LC2 remains in the un-
shiftedpositiontopreventanyreturnflowfromthedeck
motor to keep the motor from rotating.
Return flow from the front and right PTO manifolds is
routedthroughtheoilcooler,oilfilterandthentothegear
pumpinput. Return flow from the left PTO manifold pro-
vides supply for the right deck.
PTO Engaged
WhenthePTOswitch is turned ON andthe deck is low-
ered, the PTO manifold solenoid valve (S) is energized
by the TEC--5001 controller.Thisshifted solenoid valve
preventsanysenselineflowthroughthevalvewhichal-
lows the bypass cartridge LC1 to be in its neutral posi-
tion.Gear pump flow entering themanifoldis routed out
manifold port M1 and to the cutting deck motor. The re-
turn flow from the deck motor re--enters manifold port
M2. The shifted solenoid valve (S) allows a small
amount of this return flow to return to tank through a
manifoldsensinglinewhichcausesapressureincrease
that shifts brake cartridge LC2. Hydraulic flow is routed
through shifted LC2, out manifold port P2, through the
oil cooler and filter and then is routed to the gear pump
input.The deck motor continues to rotateaslongas so-
lenoid valve (S) is energized.
Deck motor case drain leakage returns to the hydraulic
reservoir.
PTO Circuit Relief
Maximum mow circuit pressure is limited for each deck
by a relief valve (RV1) in the PTO manifold. The center
and left deck relief valves are set at 3000 PSI (207 bar)
and the right deck relief valve is set at 2000 PSI (138
bar).
Relief valve (RV1) and bypass cartridge (LC1) work to-
gether as a two stage relief. When increased circuit re-
sistance is met or if a cutting blade should s trike an
object, the pressure increase is felt at the relief valve. If
the pressure should exceed the relief valve setting, the
reliefvalvewillopen,creatingasmallamountofhydrau-
licflowtoreturn to tank through amanifoldsensingline.
This flow causes a pressure increase that shifts bypass
cartridgeLC1anddivertscircuitflowawayfromthedeck
motor to manifold port P2 (Fig. 10). When circuit pres-
sure lowers, relief valve (RV1) closes which returns by-
pass cartridge LC1 back to its neutral position allowing
flow to return to the deck motor.
Figure 10
SOLENOID S ENERGIZED
RV1 SHIFTED
LC1 SHIFTED
DECK MOTOR STALLED
FRONT PTO
MANIFOLD
PUMP FLOW
RETURN
Hydraulic
System
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