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Reelmaster 3550−D Hydraulic SystemPage 4 − 65
Flush Hydraulic System
IMPORTANT: Flush the hydraulic system any time
there is a severe component failure or if the system
is contaminated (fluid 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. Operate machine under normal op-
erating conditions for at least four (4) hours before
draining.
IMPORTANT: If a component failure occurred in the
traction circuit, refer to Traction Circuit (Closed
Loop) Component Failure in this chapter for infor-
mation regarding the importance of removing con-
tamination from the traction circuit.
1. Park machine on a level surface. Lower cutting units,
disengage reel enable/disable switch. 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 this chapter.
IMPORTANT: Make sure to clean around any hy-
draulic connections that will be disassembled.
2. Drain hydraulic tank.
3. Drain hydraulic system. Drain all hoses, tubes, and
components while the system is warm.
4. Change and replace hydraulic fluid filter.
5. Inspect and clean hydraulic fluid tank (see Hydraulic
Tank Inspection in this chapter).
IMPORTANT: Follow all local codes and regulations
when recycling or disposing hydraulic fluid and fil-
ters.
6. Reconnect all hydraulic hoses, lines, and compo-
nents that were disconnected while draining system.
NOTE: Use only hydraulic fluids specified (see Traction
Unit Owner’s Manual). Other fluids may cause system
damage.
7. Fill hydraulic tank with new hydraulic fluid.
8. Prime hydraulic pumps (see Priming Hydraulic
Pumps in this chapter).
9. Start engine and let it idle at low speed for a minimum
of 2 minutes. Increase engine speed to high speed for
a minimum of 1 minute under no load.
10.Raise and lower cutting units several times. Turn
steering wheel fully left and right several times.
11.Move reel enable/disable switch to ENABLE to en-
gage cutting units and let them run for several minutes.
Move reel enable/disable switch to DISABLE.
12.Shut off engine and check for hydraulic fluid leaks.
Check fluid level in hydraulic tank and add correct
amount of hydraulic fluid if necessary.
13.Operate the machine for 2 hours under normal oper-
ating conditions.
14.Check condition of hydraulic fluid. If the new fluid
shows any signs of contamination, repeat steps 1
through 14 again until fluid is clean. If changing to biode-
gradable fluid, repeat steps 1 through 14 again at least
once and until the fluid is clean.
15.Assume normal operation and follow recommended
maintenance intervals.
Hydraulic
System