Mow Circuit - Toro Reelmaster 7000-D Service Manual

Mow Circuit

Hydraulic flow for the mow circuit is supplied by two (2)
sections of the gear pump (P2 and P3). Gear pump sec-
tion P2 supplies hydraulic flow to cutting units 1, 4 and
5 (front cutting units), while gear pump section P3
supplies cutting units 2 and 3 (rear cutting units).
A single mow control manifold is used to control flow
from the two (2) pump sections. The manifold includes
cartridge valves for control of each of the two (2) pump
circuits. Each mow circuit includes a solenoid controlled
proportional valve (SP1 and SP2), a logic cartridge (LC1
and LC2) and a circuit relief cartridge (RV1 and RV2).
All cutting reel motors are equipped with cross over relief
valves to prevent hydraulic component damage in case
a cutting reel should stall.
The Toro Electronic Controller (TEC) uses inputs from
various machine switches to determine when solenoid
proportional valve (SP1 and SP2) are to be energized.
The controller also provides a slight delay in activation
of the rear cutting units.
NOTE: The mow speed limiter must be in the LOW
speed (mow) position before the mow circuit can be en-
gaged.
Reels Engaged
When the reel enable/disable switch is turned ON with
the cutting units lowered, the proportional valves (SP1
and SP2) are energized by the TEC−5002 controller.
The energized valves shift to direct pump flow toward
the cutting unit motors. Flow from the valves is propor-
tional to current applied to the valve coil by the TEC. The
reel speed (defined by InfoCenter settings) provides the
input for the TEC to allow the appropriate current to the
proportional valve coils.
Flow through the proportional valves (SP1 and SP2) is
pressure compensated by the logic cartridge valves
(LC1 and LC2). The logic cartridge valve maintains a
pressure of 110 PSI (7.6 bar) across the proportional
valve. Any excess flow is returned to the oil cooler and
return filter.
Maximum mow circuit pressure is limited at each mow
manifold circuit by the relief valve (RV1 or RV2). The re-
lief valve pressure is 3000 PSI (207 bar).
When the reels are disengaged, the over−running iner-
tia load of the reels keeps driving the reel motors and
can turn them into pumps. The check valves (CV1 and
CV2) in the mow control manifold will open to keep the
reel motor circuit full of oil so the motors will not cavitate
(fill with air).
Reelmaster 7000−D
Reels Disengaged (Fig. 11)
When the reel enable/disable switch is OFF (or if the cut-
ting units are raised), the manifold proportional valves
(SP1 and SP2) are not energized, causing a pressure in-
crease that shifts the logic cartridges (LC1 and LC2).
The pump flow is routed through the shifted logic car-
tridge and out manifold port T1. Return oil from the man-
ifold is directed to the oil cooler and return filter.
Backlap
When either of the mow control manifold backlap valves
are rotated to the backlap (R) position, pump flow to the
cutting unit motors is reversed. This change in flow di-
rection reverses the rotation of the front or rear cutting
reel motors allowing the backlap operation.
#4 #1
1.6 CID 1.6 CID
1450 psi 1450 psi
FRONT
M1 M2
MV1
OR1
.040
SP1
G1 RV1
P1
MOW CONTROL
MANIFOLD
Page 5 − 17
REEL
MOTORS
#5 #2 #3
1.6 CID 1.6 CID 1.6 CID
1450 psi 1450 psi 1450 psi
REAR
M4 M3
MV2
CV1 CV2 OR2
.040
110 psi 110 psi
SP2
LC1 LC2
3000 psi 3000 psi
RV2 G2
T1 T2 P2
Figure 11
Hydraulic System