Toro 10176SL Service Manual Models 30448 30446 Groundsmaster 4000 4010 D D Preface

Relieving Hydraulic System Pressure
Before disconnecting or performing any work on the hy-
draulic  system, all  pressure  in the  hydraulic system
mustberelieved.Parkmachineonalevelsurface,make
sure that PTO switch is OFF, lower cutting decks fully,
stop engine and engage parking brake. Wait for all mov-
ing parts to come to a complete stop.
To relieve hydraulic pressure in lift circuit, start engine
andfullylower  thecuttingdecks. Turnkeyswitch  toOFF
and remove key from the ignition switch.
System pressure  in mow circuit  is relieved  when the
PTO switch is disengaged.
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.
Traction Circuit Component Failure
The  traction  circuit on  Groundsmaster  4000--D  and
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-
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.
4010--D
machines is a closed loop system that includes
the piston (traction) pump,  two (2) front wheel motors
and the rear axle motor. If a component in the traction
circuit should  fail, debris and  contamination from  the
failed component will circulate  throughout the traction
circuit. This contamination  can damage other compo-
nents in  the circuit so  it must be removed  to prevent
additional component failure.
The recommended method of removing traction circuit
contamination would be to  temporarily install the Toro
high flow hydraulic filter (see Special Tools in this chap-
ter) into the circuit. This filter should be used when con-
necting hydraulic  test gauges in order  to test traction
circuitcomponents orafterreplacing  afailedtractioncir-
cuit component  (e.g. traction (piston)  pump or  wheel
motor). The filter will ensure that contaminates are re-
movedfromtheclosedloopandthus,donotcauseaddi-
tional 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.
Hydraulic System
Page 4 -- 4
Groundsmaster 4000--D/4010--D
Product Specification
CategoriesLawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals
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