Toro 10178SL Service Manual Groundsmaster 4300 D Preface Publication

Relieving Hydraulic System Pressure
Before disconnecting or performing any work on the hy-
draulic  system, all  pressure  in the  hydraulic system
mustberelieved.Parkmachineonalevelsurface,lower
cutting  decks fully,  stop engine  and engage  parking
brake.
To relieve hydraulic pressure in lift circuit,  turn ignition
switchtoON(donotstartengine)andfullylowerthecut-
ting decks. After  decks are fully lowered,  turn ignition
switch to OFF and remove key from the switch.
IMPORTANT: If machine will be serviced on a lift or
at an elevated position, fully lower the cutting decks
after the machine has been raised to ensure that the
lift cylinders  are fully  extended. Pressure  will be
maintained in the lift cylinders unless they are fully
extended.
To relieve  hydraulic pressure in  traction circuit, move
traction pedal to both forward and reverse directions. To
relieve  hydraulic  pressure  in  steering circuit,  rotate
steering wheel in both directions.
System pressure in cutting circuit is relieved when the
cutting decks are disengaged.
Traction Circuit Component Failure
The  traction circuit  on  Groundsmaster  4300--D  ma-
chines is a closed loop system that includes the piston
(traction) pump and four (4) wheel motors. If a compo-
nentinthetractioncircuitshouldfail,debrisandcontam-
ination   from   the   failed   component   will   circulate
throughout the traction circuit. This contamination can
damage other components inthe circuit so itmust be re-
moved to prevent additional component failure.
cuit to allow oil flow throughout the circuit. The filter will
remove contamination  from the traction  circuit during
operation. Because the Toro high flow filter is bi--direc-
tional, thetraction circuitcan beoperated inboth thefor-
ward  and   reverse  direction.   The  filter   should  be
removed  from the  machine  after  contamination has
been removed  from the  traction circuit.  See Filtering
Closed--LoopTractionCircuitintheServiceandRepairs
section of this chapter for additional information on us-
ing the Toro high flow hydraulic filter.
The recommended method of removing traction circuit
contamination would be to  temporarily install the high
flow hydraulic filter (see  Special Tools in this chapter)
into the circuit. This filter should be used when connect-
ing hydraulic test gauges in order to test traction circuit
components or  after replacing a  failed traction circuit
component (e.g. traction (piston) pumpor wheelmotor).
The filter  will ensure  that contaminates  are removed
from the closed loop and thus, do not cause additional
component damage.
Thealternative tousingtheTorohighflowhydraulicfilter
kit after a traction circuit component failure would be to
disassemble,  drain and  thoroughly clean  all  compo-
nents, tubes and hoses in the traction circuit. If any de-
bris remains in  the traction circuit and the  machine is
operated,thedebriscancauseadditionalcircuitcompo-
nent failure.
NOTE:  The traction pump case drain could allow any
debrisinthetractioncircuittocontaminateotherhydrau-
lic circuits on the machine.
Once the  Toro high  flow hydraulic  filter kit  has been
placed in the circuit, raise and support the machine with
all wheels off the ground. Then, operate the traction cir-
Hydraulic System
Page 4 -- 8
Groundsmaster 4300--D
Product Specification
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