Greensmaster 3150 Hydraulic SystemPage 4 -- 15
Mow and Backlap
The tandem gear pump is directly coupled to the piston
(traction) pump. The front gear pump section supplies
oil flowto the hydraulic manifoldblockandto the cutting
reel motors. The gear pump takes its suction directly
from the hydraulic reservoir. Maximum circuit pressure
islimitedbysolenoidreliefvalve(S1R1)whichislocated
in the hydraulic manifold.
With the engine running and the functional control and
joystick levers positioned so the reels will not turn (see
Operator’s Manual), solenoid relief valve (S1R1) in the
hydraulic manifold is de--energized. The de--energized
(S1R1) by--passes flow from the front gear pump sec-
tion to the oil filter and hydraulic reservoir. Additionally,
the manifold pressure reducing valve (PRV) will remain
seatedto preventthe reelmotors(andreels)from rotat-
ing.
Mow
With the engine running and the functional control and
joystick levers positionedso the reels will turn(see Op-
erator’s Manual), solenoid relief valve (S1R1) is ener-
gized.Intheenergizedposition,thisvalvedirectsoilflow
to the reel motors and also functions as the mow circuit
relief valve.
Oil flow from manifold port (P1) flows through the reel
speed control valve (FC1). Flow across the speed con-
trolvalveispressurecompensatedbythelogiccartridge
valve (LC). The logic cartridge valve maintains a pres-
sure differential of 75 PSI (5.2 bar) across the speed
control valve. Any excess flow above the speed control
valve setting is by--passed to the reservoir through the
logiccartridgevalve. Withthe backlapvalve(MR)in the
mow position, oil flows through the backlap valve, out
manifold port (MA) and to the reel motors that are con -
nected in series. Oil flows through the leftf ront reel mo-
tor, right front motor and then center motor to turn the
reel motors in the mow direction.
When in the mow position, mow circuit pressure will
cause the hydraulic manifold pilot piston to shift and
open the pressure reducing valve (PRV). The shifted
pressurereducingvalve allows circuitoil toreturnto the
reservoir through the manifold block, oil filter and oil
cooler (if equipped).
Backlap
Backlapping operation is the same as mowing opera-
tion, except for the position of the backlap valve (MR).
Whenthebacklapvalve(MR)isinthebacklapposition,
oil flows through the backlap valve, out manifold port
(MB)andtothereelmotorsthatareconnectedinseries.
Oil flowsthrough the center reelmotor, right frontmotor
andthen leftfrontmotorasit turnsthereel motorsinthe
backlap direction.
Hydraulic
System
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