Flushing The Hydraulic System - Toro Reelmaster 6500–D Service Manual

Flushing the Hydraulic System

IMPORTANT: Flush the hydraulic system any time
there is a severe component failure or the system is
contaminated (oil appears milky or black or con-
tains metal particles).
IMPORTANT: Flush hydraulic system when chang-
ing from petroleum base hydraulic fluid, such as
Mobil 424, to biodegradable fluid, such as Mobil
EAL 224H. Operate machine under normal operat-
ing conditions for at least four (4) hours before
draining.
1. Lower cutting units, stop engine, engage parking
brake and remove key from ignition switch.
2. Drain the system, including cylinders, hoses and tube
lines while system is warm.
3. Inspect and clean reservoir (see Inspecting Reservoir
Parts).
4. Clean area around filter mounting area. Remove and
discard filter. Make sure filter mounting surface is clean.
Apply hydraulic oil to gasket on new filter. Fill filter with
hydraulic fluid. Screw filter on until gasket contacts
mounting plate, then tighten filter one–half turn.
5. Fill hydraulic reservoir. NOTE: Use biodegradable
fluid, such as Mobil EAL 224H, for this step if you are
changing to this type of fluid. Use only hydraulic fluids
specified (see Specifications section of this chapter).
Other fluids could cause system damage.
6. Disconnect fuel stop solenoid electrical connector to
prevent engine from starting.
7. Turn ignition key switch to engage starter for ten (10)
seconds to prime pump. Repeat this procedure again.
8. Connect fuel stop solenoid electrical connector.
9. Start engine and let idle at low speed for minimum of
two (2) minutes.
10. Increase engine speed to high idle for minimum of
one (1) minute under no load.
11. Turn steering wheel fully left and right several times.
12. Raise and lower cutting units several times.
Hydraulic System
13. Shut off engine and check for hydraulic oil leaks.
Check oil level in hydraulic reservoir and add correct oil
if necessary.
14. Operate the machine for two (2) hours under normal
operating conditions.
15. If the flushing fluid shows any signs of contamina-
tion, or if you are changing to biodegradable fluid, do
steps 1 – 13 again.
16. Assume normal operation and follow recommended
maintenance intervals.
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Figure 132
1. Hydraulic reservoir
Figure 133
1. Hydraulic filter
2. Condition indicator
Reelmaster 6500–D/6700–D