Mow and Backlap (Serial Number Under 260999999)
The gear pump (P1) is directly coupled to the hydrostat
which is driven directly by the engine. Taking its suction
directly from the hydraulic reservoir, the gear pump (P1)
supplies oil flow to the hydraulic manifold block and to
the cutting reel motors. Maximum circuit pressure is lim-
ited by relief valve (R1) which is located in the hydraulic
manifold.
On machines with backlap capabilities, flow through the
manifold block when in mow is somewhat different. Oil
flow from manifold port (P1) flows through the reel
speed control valve (FC1). Flow across the speed con-
trolvalveispressurecompensatedbythelogiccartridge
valve (LC1). The logic cartridge valve maintains a pres-
sure 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 backlap valve
(RD1) in the mow position, oil flows through the backlap
valve, outmanifold port (MA), andto thereel motors that
are connected in series.
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.
Mow
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, oil
filter and then to the 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. Gear pump(P1) flowis routed outmanifold port
(MA), and to the reel motors that are connected in se-
ries. Oil flows through the left (M2), right (M3), and then
rear reel motor (M1) as it turns the motors in the mow
direction. The oil then returns through the manifold
block, oil filter and then to the reservoir.
Backlap
On machines with backlap capabilities, backlapping op-
eration is the same as mowing operation, except for the
position of the backlap valve (RD1). When the backlap
valve (RD1) is in the backlap position, oil flows through
the rear (M1), right (M3), and then left (M2) reel motor
as it turns the motors in the backlap direction.
Note:
230000801
On traction units with serial number from
to 260999999, solenoid valve (S6) is ener-
gized when the cutting units are raised. This forces the
returnflowfromthereelmotorsthroughthe.125”orifice,
putting back pressure on the reel circuit, and stopping
the reels from rotating.
Greensmaster 3150
Page 4 -- 17
Hydraulic System (Rev. E)
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Tags | Toro Greensmaster 3150 |
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| Document Type | Service Manual |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
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| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
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