Toro Groundsmaster 4100-D Service Manual page 113

Flush Hydraulic System
IMPORTANT: Flush the hydraulic system any time
there is a severe component failure or the system is
contaminated. Contaminated oil may appear milky
or black or may contain metal particles.
IMPORTANT: If a component failure occurred in the
closed loop traction circuit (e.g. piston pump or
wheel motor), filtering the traction circuit is recom-
mended. See Filtering Closed- -Loop Traction Circuit
in this section.
1. Park machine on a level surface. Lower cutting deck
to the ground, stop engine and apply parking brake. Re-
move key from the ignition switch.
WARNING
Before disconnecting or performing any work
on the hydraulic system, all pressure in the sys-
tem must be relieved. See Relieving Hydraulic
System Pressure in the General Information sec-
tion in this chapter.
IMPORTANT: Make sure to clean around any hy-
draulic connections that will be disconnected for
draining.
2. Drain hydraulic reservoir. Remove suction screen
from reservoir and clean thoroughly. Consider removing
and cleaning reservoir if necessary.
3. Drain hydraulic system. Drain all hoses, tubes and
components while the system is warm.
4. Change and replace both hydraulic oil filters.
5. Inspect and clean hydraulic reservoir (see Hydraulic
Reservoir Inspection in this section).
Groundsmaster 4100--D/4110--D
6. Connect all hydraulic hoses, lines and components
that were disconnected while draining system.
NOTE: Use only hydraulic fluids specified in the Opera-
tor's Manual. Other fluids may cause system damage.
7. Fill hydraulic reservoir with new hydraulic fluid.
8. Disconnect electrical connector from engine run so-
lenoid.
9. Turn ignition key switch and engage starter for ten
(10) seconds to prime hydraulic pumps. Wait fifteen (15)
seconds to allow the starter motor to cool and then re-
peat cranking procedure again.
10.Connect electrical connector to engine run solenoid.
11. Start engine and let it idle at low speed (1450 RPM)
for a minimum of two (2) minutes. Increase engine
speed to high idle (2870 RPM) for minimum of one (1)
minute under no load.
12.Raise and lower cutting deck several times. Turn
steering wheel fully left and right several times.
13.Shut off engine and check for hydraulic oil leaks.
Check oil level in hydraulic reservoir and add correct
amount of oil if necessary.
14.Operate machine for two (2) hours under normal op-
erating conditions.
15.Check condition of hydraulic oil. If the new fluid
shows any signs of contamination, repeat steps 1
through 14 again until oil is clean.
16.Assume normal operation and follow recommended
maintenance intervals.
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