Mow And Backlap - Toro Greensmaster 3150 Service Manual

Mow and Backlap

Mow
The gear pump (P1) is directly coupled to the the hydros-
tat which is driven directly by the engine. Taking its suc-
tion directly from the hydraulic reservoir, the gear pump
(P1) supplies oil flow to the hydraulic manifold block and
to the cutting reel motors.
With the engine running and the Functional Control and
Raise/Lower/Mow levers positioned so the reels will
not turn (see Operator's Manual), solenoid valve (S1) is
de–energized. (S1) by–passes flow from the gear pump
(P1) directly to the hydraulic reservoir.
With the engine running and the Functional Control and
Raise/Lower/Mow levers positioned so the reels will
turn (see Operator's Manual), solenoid valve (S1) is en-
ergized. Flow is diverted to the reel motors.
Note: On traction
230000801 and up, solenoid valve (S6) is energized
when the cutting units are raised. This forces the return
flow from the reel motors through the .125" orifice, putt-
ing back pressure on the reel circuit, and stopping the
reels from rotating.
On units with the optional backlap kit installed, flow
through the manifold block is different. Oil flow from port
Hydraulic System
units with serial numbers
(P1) flows through the reel speed control valve (FC1).
Flow across the speed control valve is pressure com-
pensated by 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 optional backlap valve (RD1) in the mow posi-
tion, oil flows through the valve, out port (MA), and to the
reel motors that are connected in series.
Oil flows through the left (M2), right (M3), and then rear
reel motor (M1) as it turns the motors in the mow direc-
tion. The oil then returns through the manifold block and
oil filter and then to the reservoir.
Backlap
Backlapping operation is the same as mowing opera-
tion, except for the position of the backlap valve (RD1).
When the backlap valve (RD1) is in the backlap posi-
tion, oil flows through the rear (M1), right (M3), and then
left (M2) reel motor as it turns the motors in the backlap
direction.
Page 4 – 12 Greensmaster 3150