Raise Cutting Units - Toro Reelmaster 5100-D Service Manual

Raise Cutting Units

The "P1" pump circuit controls the raise and lower
function of all five cutting units. On the "P1" pump circuit,
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".
To raise the cutting units, solenoid valve "S7" is ener ­
gized to direct pump flow through valve "S6", a normally
closed poppet-type valve, and on to valves "S3", "S4",
and "S5". These three normally closed valves control
which cutting units raise or lower. To raise a cutting unit,
valve "S7", and "S3", "S4" or "S5" must be energized.
System Pressure
Low Pressure, Return or Case Drain
Oil Flow
to port D1
Front Ree Motors l
M4 M5
S8
VS1
S1
S7
R1
3000 PSI
G1
P1
Pump
®
Reelmaster 5100-D
4 1
Front Lift Cylinders
Variab le
Orifice
S3A S4A
S3
R2
2000 PSI
T D1 D2
The return oil from the cylinders is directed back to tank
externally from the valve block.
To hold the cutting units up in any position, all of the
solenoid valves are de-energized. Valve "S6" is the load
holding valve and this is the reason it is a poppet-type
valve.
The lift speed of No. 1 (front center), and No. 2 and 3
(rear) cutting units is regulated by one-way variable
orifices which are located in the hydraulic lines between
the valve block and lift cylinders.
Solenoids Energized
Lift
5
Rear L ft Cylinders i
2 3
Rear Ree
Motors
S5A M2
S5
S4
S9
S6
G2
P2 Control Valve Block
Pump
Figure 12
Page 4 - 11 Rev. A
All Cutt ng Units: i S7, S3, S4, S5
Steering Cylinder
250 PSI
to port D2
l
M3
S2
VS2
Steering
Pump
Hydraulic Flow Diagrams
Steering
Valve