Reel Circuit
Mow
REEL CIRCUIT SCHEMATIC FOR MACHINES
WITH SERIAL NUMBERS BELOW 230000000
The gear pump (P1) is directly coupled to the the hydros-
tat which is driven by the engine. Taking its suction di-
rectly from the hydraulic tank, the gear pump supplies oil
flow to the manifold block and to the reel motors.
TO MANIFOLD
D1 PORT
TO MANIFOLD
M1 PORT
LEFT
FRONT
Solenoid valve (S1) is de−energized with the engine
running when either the reels on/off switch is OFF, the
cutting units are up, or the transport/mow switch is in
TRANSPORT. S1 by−passes flow from the reel motors
directly to the hydraulic reservoir.
TO MANIFOLD
M2 PORT
RIGHT
FRONT
REAR
Solenoid valve (S1) is energized with the engine running
when the reels on/off switch is ON, the cutting units are
down, and the transport/mow switch is in MOW. Flow is
diverted to the reel motors.
Figure 8
REEL CIRCUIT SCHEMATIC FOR MACHINES
WITH SERIAL NUMBERS ABOVE 230000000
Oil flows from port (P1) across the logic cartridge valve
(LC1). The logic cartridge valve maintains a pressure
differential 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 reservoir through the
logic cartridge valve. With the backlapping valve (MD1)
in the mow position, oil flows through the valve, out port
(M1), and to reel motors that are connected in series.
TO MANIFOLD
D1 PORT
TO MANIFOLD
M1 PORT
REAR
TO MANIFOLD
M2 PORT
RIGHT
FRONT
On machines with serial numbers below 230000000
(Fig. 8), oil flows through the left front, right front, and
then rear reel motors as it turns the motors in the mow
direction. The oil then returns into manifold block port
(M2) and then to the hydraulic tank.
LEFT
FRONT
Figure 9
On machines with serial numbers above 230000000
(Fig. 9), oil flows through the rear, right front, and then
left front reel motors as it turns the motors in the mow
direction. The oil then returns into manifold block port
(M2) and then to the hydraulic tank.
Backlap
Backlapping operation is the same as mowing opera-
tion, except for the position of the backlap valve (MD1).
When the backlap valve is in the backlap position on
machines with serial numbers below 230000000, oil
flows through the rear, right front, and then left front reel
motors (Fig. 8) as it turns the motors in the backlap direc-
tion.
On machines with serial numbers above 230000000
(Fig. 9), when the backlap valve is in the backlap posi-
tion, oil flows through the left front, right front, and then
rear reel motors
Reelmaster 3100−D
Hydraulic System (Rev. C)
Page 4 − 13
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