Mow And Backlap - Toro Reelmaster 5500-D Service Manual

Mow and Backlap

Mow
The reel manifold contains two independent control cir-
cuits 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 oil cooler, oil
filter, and on 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. Solenoid valve (MS1) must be ener-
gized to prevent hydraulic flow from by-passing the front
reel circuit. When solenoid valve (MS1) is energized, oil
flow from port (P1) flows through reel speed control
valve (FC1). Flow through 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 excess
flow is returned to the hydraulic reservoir. Regulated
flow continues through valve (MD1) and out to the front
reel motors. When valve (MD1) is in the "Mow" position,
the front reels rotate correctly for mowing. Return oil
from the motors is also directed to the reservoir through
valve (MD1).
System pressure on the (P1) side can be measured at
Port (G1).
Reelmaster 5500-D
On the circuit supplied by pump section (P2), maximum
system pressure is limited by relief valve (R2), which is
set at 2000 PSI. Solenoid valve (MS2) must be ener-
gized to prevent hydraulic flow from by-passing the rear
reel circuit. When solenoid valve (MS2) is energized, oil
flow from port (P2) flows through reel speed control
valve (FC2). Flow through 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 is returned to the hydraulic reservoir. Regulated
flow continues through valve (MD2) and out to the rear
reel motors. When valve (MD2) is in the "Mow" position,
the rear reels rotate correctly for mowing. Return oil from
the motors is also directed to the reservoir through valve
(MD2).
System pressure on the (P2) side can be measured at
Port (G2).
Backlap
During the backlap mode of operation, the reel circuits
operate the same as in the "Mow" mode. When either
valve (MD1) or (MD2) is set to the "Backlap" position,
the valve reverses the direction of hydraulic flow through
the front or rear reel motors.
Page 4 - 19 Hydraulic System (Rev. C)