Mow And Backlap - Toro Reelmaster 5200-D Service Manual

Mow and Backlap

Mow
The hydraulic manifold block establishes of two inde-
pendent control circuits for the front and rear cutting
units. Each circuit is supplied by its own pump section.
Pump section (P1) supplies hydraulic power to the front
cutting units, while section (P2) supplies the the rear
units. Both circuits share manifold port (T), which drains
to the hydraulic reservoir.
On the circuit supplied by pump section (P1), maximum
system pressure is limited by relief valve (R1), which is
set at 3000 PSI. System pressure on the (P1) side can
be measured at Port (G1). Total pump flow must go
through solenoid valve (S7). In its normal deenergized
position, valve (S7) directs pump flow to the front reel cir-
cuit. Solenoid valve (S1) must be energized to prevent
hydraulic flow from by-passing the front reel circuit.
When solenoid valve (S1) is energized, oil flow from port
(P1) flows through reel speed control valve (FC1) and
normally deenergized, solenoid valve (S8) and out to
the front reel motors. Flow across the speed control
valve is pressure compensated by logic cartridge valve
(LC1). The logic cartridge valve maintains a pressure of
75 PSI (5.2 bar) across the speed control valve. Any ex-
cess flow above what the speed control valve is set for
is by-passed to the hydraulic reservoir through the logic
Reelmaster 5200-D/5400-D
cartridge valve. Return oil from the motors is also di-
rected to tank through valve (S8).
On the circuit supplied by pump section (P2), maximum
system pressure is limited by relief valve (R2), which is
set at 2000 PSI. This pressure can be monitored at port
(G2). Total pump flow must go through solenoid valve
(S9). In its normal deenergized position, valve (S9) di-
rects pump flow to the rear reel circuit. Solenoid valve
(S2) must be energized to prevent hydraulic flow from
by-passing the rear reel circuit. When solenoid valve
(S2) is energized, oil flow from port (P2) flows through
reel speed control valve (FC2) and normally deener-
gized, solenoid valve (S9) and out to the rear reel mo-
tors. Flow across the speed control valve is pressure
compensated by logic cartridge valve (LC2). The logic
cartridge valve maintains a pressure of 75 PSI (5.2 bar)
across the speed control valve. Any excess flow above
what the speed control valve is set for is by-passed to
the hydraulic reservoir through the logic cartridge valve.
Return oil from the motors is directed to tank through
valve (S9).
Backlap
During backlap mode of operation, the reel circuits oper-
ate the same as in the "Mow" mode, except for the op-
eration of solenoid valves (S8) and (S9). When
energized, these valves reverse the direction of hydrau-
lic flow through the reel motors. The electrical system is
designed using the backlap switch so that only one cir-
cuit (front cutting units or rear cutting units) can be oper-
ated when in the backlap mode.
Page 4 - 17 Hydraulic System