Lower Cutting Units
Thehydraulic pumpassembly isdrivenbyacoupling at-
tached to the engine flywheel. The pump assembly con-
sists of a three section gear pump, a gerotor charge
pump, and a variable displacement piston pump.
The lowering speed of the cutting units are regulated by
several flow control valves. Location of these control
valves depend on the machine as follows:
1.
On RM--6500--D machines with serial number below
Gear pump section (P3) provides oil flow through the
steering control valve and lift manifold to all cutting unit
liftcylinders.Maximumcircuitpressure(1500PSI/104.0
bar) is limited by a relief valve in the gear pump (R3).
280000000, two adjustable flow control valves regulate
lift cylinders #1, 4, and 5. These control valves are lo-
cated on the main lift manifold (one flow control regu-
lates lift cylinders #4 and 5). The adjustable flow control
valve that regulates lift cylinders #2 and 3 is located in
the rear of the traction unit.
When the cutting units are in the raised position, flow
from the gear pump (P3) passes through the steering
controlvalveandintotheliftmanifold.Allliftmanifoldso-
lenoid valves are de-energized and flow is directed to
the hydraulic reservoir. An electrically activated flow di-
vider (FD1) is also de-energized, preventing flow be-
tween the #4 and 5 lift cylinders.
2. OnRM--6500--Dmachines withserialnumberabove
280000000, three adjustable flow control valves in the
lift control manifold regulate the lift cylinders. One con-
trol valve regulates cylinder #1, a second controls cylin-
ders #2 and 3 and the third controls cylinders #4 and 5.
To lower the cutting units, solenoid valves (SV3), (SV4),
(SV5), (SV6), (SV7), and (SV8) energize along with so-
lenoid valve (SV1) and flow divider (FD1). Solenoid
valve (SV2) is in its normally de-energized position, and
directs oil flow to the piston end of the lift cylinders. Hy-
draulic pressure against the piston side of the cylinder
causes the shafts to extend, and lower the cutting units.
When the solenoids and the flow divider are de-ener-
gized, the lift cylinders are held in the lowered position.
3. On RM--6700--D machines with serial number below
280000000, four adjustable flow control valves regulate
lift cylinders #1, 4, 5, 6, and 7. These control valves are
located on the main lift manifold (one flow control regu-
lates lift cylinders #4 and 5). The adjustable flow control
valve that regulates lift cylinders #2 & 3 is located in the
rear of the traction unit.
4.
OnRM--6700--Dmachines withserialnumberabove
five adjustable flow control valves in the lift
280000000,
Pressure to the lift manifold can be monitored at port
(G3).
control manifold regulate the lift cylinders. One control
valve regulates cylinder #1, the second controls cylin-
ders #2 and 3, the third controls cylinders #4 and 5, the
fourth controls cylinder #6 and the fifth controls cylinder
#7.
Reelmaster 6500-D/6700-D
Page 4 - 17 Rev. F
Hydraulic System
| Categories | Lawn Mower Manual, Toro Lawn Mower Manual |
|---|---|
| Tags | Toro Reelmaster 6500-D, Toro Reelmaster 6700-D |
| Download File |
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| Document Type | Service Manual |
| Language | English |
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| Product Type | Walk Behind Mower |
| Engine Manufacturer | Toro |
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| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
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