Toro 03113SL Rev E Greensmaster 3150 Service Manual

Raise and Lower Cutting Units (Serial Number Under 260999999)
The gear pump (P2) is directly coupled to the hydrostat
through gear pump (P1). It supplies hydraulic pressure
for raising and lowering the cutting units, for the steering
circuit, and for maintaining 100 to 150 PSI (6.9 to 10.0
bar)  to the  low  pressure  side of  the  traction  circuit
(charge pressure). Thegear pump(P2) takes itssuction
from the hydraulic reservoir. Maximum circuit pressure
is limited  by relief  valve (R5)  which is located  in the
steering control valve.
Lower Cutting Units
Circuit operation for lowering the lift cylinders is similar
to raising them.  However, the solenoid valve  (S3) re-
mains de--energized and  solenoid valve (S4) is  ener-
gized. Flow  is reversed to  and from the lift  cylinders,
lowering the cutting units.
When the cutting units are to be lowered, solenoid valve
(S2) is energized and blocks flow directly to the hydros-
tat. Flow  is  directed to  de--energized solenoid  valve
(S3), which directs  flow to the lift  cylinders. Hydraulic
pressure against the cylinder pistons moves their shafts
causing the cutting units to lower. At the same time, the
pistons push the hydraulic fluid out of the lift cylinders to
energized  solenoid valve  (S4). Flow  continues  back
through solenoid valves (S3) to the hydrostat. Flow into
the flow control valve is slowed by the variable orifice to
allow the rear cutting unit to lower after the front units.
During cutting unit hold (not raising or lowering) condi-
tions,flow fromthe gearpump isby--passedthroughthe
steering control valve and solenoid valve (S2) directly to
thehydrostat andthe charge relief valve (R4). Flowthen
returns to the hydraulic reservoir.
Raise Cutting Units
When the cutting units are to be raised, solenoid valve
(S2) is energized and blocks flow directly to the hydros-
tat. Flow is directed  to energized solenoid valve (S3),
which directs flow to de--energized solenoid valve (S4)
and the lift cylinders. Hydraulic pressure against the cyl-
inder pistons  moves  their shafts  causing the  cutting
units to raise. At the same time, the pistons push the hy-
draulic fluid out of the lift cylinders and back through so-
lenoid valves (S3) to the hydrostat.
To control pressure while lowering cutting units, the sys-
tem is equipped with adjustable relief valve (R2) in the
hydraulic manifold.
When the solenoid  valves de--energize, spring  action
returns  the valves  to  their original  position  and by--
passes flow back to the hydrostat stopping lift cylinder
movement.
When the solenoid  valves de--energize, spring  action
returns  the valves  to  their original  position  and by--
passes flow back to the hydrostat stopping lift cylinder
movement. The lift cylinder position  is locked in place
since there is no complete circuit of flow to and from the
lift cylinders.
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 preventing
the reels from rotating when raised.
Greensmaster 3150
Page 4 -- 13
Hydraulic System (Rev. E)
Product Specification
CategoriesLawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals
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- 306 pages
Document TypeService Manual
LanguageEnglish
Product BrandToro. Customer Service Representatives are available by phone: Monday - Friday 7:30 a.m. to 9:00 p.m. (CDT) - Saturday 8:00 a.m. to 8:00 p.m. (CDT) - Sunday 10:00 a.m. to 8:00 p.m. (CDT)
Canada 1-888-225-4886 USA 1-888-384-9939, Lawn Mower
Document File TypePDF
Publishertoro.com
Wikipedia's PageToro Company
CopyrightAttribution Non-commercial
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Toro 03113SL Rev E Greensmaster 3150 Service Manual SKU UPC Model
kurt on May 29, 2014.

Safety switches not working


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