Toro 00062SL Rev I Greensmaster 3250 D 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 10.3
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).
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 in the down position and sole-
noid valve (S4)  is energized and shifts  down. Flow is
reversed to and from the lift cylinders, thus moving the
cutting units down.
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),whichdirectsflowtoenergized   solenoid valve(S4)
and the lift cylinders. Hydraulic pressure against the cyl-
inder pistons  moves  their shafts  causing the  cutting
units to lower.At the same time,the pistons push thehy-
draulic fluid out of the lift cylinders and back through so-
lenoid valves (S4 and S3) to the hydrostat. Flow into the
flow control valve is slowed by the variable orifice to al-
low the rear cutting unit to lower after the front units.
During conditions of not lifting or lowering cutting units,
flowfromthegearpumpisby--passedthroughthesteer-
ing control valve and solenoid valve (S2) directly to the
hydrostat and the charge relief valve (R4). Flow then re-
turns 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 (S4 and S3) to the hydrostat.
To control pressure while lowering cutting units, system
is equipped with adjustable relief valve (R2) in the  hy-
draulic 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:
230000601
On  traction  units  with  serial  numbers  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 3250--D
Page 4 -- 17
Hydraulic System (Rev. I)
Product Specification
CategoriesLawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals
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- 308 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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