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Rev. B
Groundsmaster 3505--DHydraulic System Page 4 -- 52
Flush Hydraulic System
IMPORTANT: Flush the hydraulic system any time
there is a severe component failure or if the system
is contaminated (oil appears milky, black or con-
tains metal particles).
IMPORTANT: Flush hydraulic system when chang-
Ing from petroleum base hydraulic fluid to a biode-
gradable fluid such as Toro Biodegradable
Hydraulic Fluid.
IMPORTANT: If a component failure occurred in the
traction circuit, refer to Traction Circuit (Closed
Loop) Component Failure in the General Informa-
tion section for information regarding the impor-
tance of removing contamination from the traction
circuit.
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for at least four (4)
hours.
2. Park machine ona level surface. Lower cutting units,
stop engine and engage parking brake. Remove key
from the ignition switch.
WARNING
Before disconnecting or performing any work
on the hydraulic system, all pressure in the
system must be relieved. See Relieving Hy-
draulic System Pressure in the General Infor-
mation section.
IMPORTANT: Make sure tothoroughly cleanaround
all hydraulic connections that will be disassembled.
3. Drain hydraulic tank (see Traction Unit Operator’s
Manual).
4. Drain hydraulic system. Drain all hoses, tubes and
components while the system is warm.
5. Change and replace hydraulic oil filter (see Traction
Unit Operator’s Manual).
6. Inspect and clean hydraulic oil tank (see Hydraulic
Tank Inspection in this section).
7. Reconnect all hydraulic hoses, lines and compo-
nents that were disconnected to drain hydraulic system.
NOTE: Use only hydraulic fluids specified in Traction
Unit Operator’s Manual. Other fluids may cause system
damage.
8. Fill hydraulic tank with new hydraulic fluid (see Trac-
tion Unit Operator’s Manual).
9. Disconnectwire harnesslead fromfuel stopsolenoid
to prevent the engine from starting. Make sure traction
pedal and lift control lever are in the neutral position.
10.Turn ignition key s witch and engage starter for ten
(10) seconds to prime the tractionand gear pumps. Wait
fifteen (15)seconds toallow thestarter motorto cooland
then repeat cranking procedure again.
11.Connect wire harness electrical connector to fuel
stop solenoid.
12.Start engine and let it idle at low speed (1400 +
50
RPM) for a minimum of 2 minutes. Increase engine
speed to high idle (3050 +
50 RPM) for a minimum of 1
minute under no load.
13.Raise and lower cutting units several times. Turn
steering wheel fully left and right several times.
14.Shut off engine and check for hydraulic oil leaks.
Check oil level in hydraulic tank and add correct amount
ofoil ifnecessary (seeTractionUnit Operator ’s Manual).
15.Operate the machine for 2 hours under normal oper-
ating conditions.
16.Check condition of hydraulic oil. If the new fluid
shows any signs of contamination, repeat steps 1
through 14 again until oil is clean. If changing to biode-
gradable fluid, repeat steps 1 through 14 again at least
once and until the oil is clean.
17.Assume normal operation and follow recommended
maintenance intervals.