Toro Greensmaster TriFlex 3400 - Mow and Backlap

Greensmaster 3300/3400 Hydraulic SystemPage 5 -- 19
Mow and Backlap
The tandem gear pump is directly c oupled to the piston
(traction) pump. The front gear pump section supplies
hydraulic flow forthemow circuit. Thegearpump takes
its suction from the hydraulic reservoir and supplies oil
flow to the mow control manifold and to the cutting reel
motors. Maximum circuit pressure is limited by the pro-
portional relief valve (PRV) located in the mow control
manifold.
With the functional control lever and joystick not in the
mowposition,proportionalreliefvalve(PRV)inthemow
control manifold is de--energized. The de--energized
PRVroutes gearpumpflowdirectlytothe hydraulicres-
ervoir by--passing the cutting reel motors. Additionally,
manifold pressure reducing valve (PORV) will remain
seatedto preventthereelmotors(and reels)fromrotat-
ing.
Mow
With the engine running, the functional control lever in
MOWandthejoystickmovedtothereelslowerposition,
proportional relief valve (PRV) is energized by the TEC
controller.Intheenergizedposition,thisvalvedirectsoil
flow toward the reel motors and also functions as the
mow circuit relief valve.
Oilflowfrommanifold portPflows throughtheflowcon-
trol valve (FC) used to adjust reel speed. Flow across
the flow control valve is pressure compensated by the
logic cartridge valve (LC). The logic cartridge valve
maintains a pressure differential of 75 PSI (5.2 bar)
across the speed control valve. Any excess flow above
the speed controlvalvesetting is by-- passed to the res-
ervoirthroughthelogiccartridgevalve.Withthebacklap
valve(MV)inthemow position, oil flows through the
backlapvalve,outmanifoldport(M1)andtothereelmo-
tors that are connected in series. Oil flows through the
left (#2), right (#3) and then center reel motor (#1) as it
turns the motors in the mow direction.
When in the mow position, mow c ircuit pressure will
cause the mow control manifold pilot piston to shift and
open the pressure reducing valve (PORV). The shifted
pressurereducingvalveallowscircuit oiltoreturn tothe
reservoir through the manifold block.
Backlap
Backlapping operation is the same as mowing opera-
tion, exceptfor the positionof thebacklapvalve (MV)in
themowcontrolmanifold.Whenthebacklapvalve( MV)
is in the backlap position, oil flows through the center
(#1),right(#3)andthenleft(#2)reelmotorasitturnsthe
motors in the backlap direction.
Hydraulic
System