Flush Hydraulic System - Toro Groundsmaster 3500 30807 Service Manual

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 PTO switch. stop engine, and engage park-
ing 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).
Hydraulic System
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 PTO switch to ON to engage cutting units and
let them run for several minutes. Move PTO switch to
OFF.
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 13 again until fluid is clean. If changing to biode-
gradable fluid, repeat steps 1 through 13 again at least
once and until the fluid is clean.
15.Assume normal operation and follow recommended
maintenance intervals.
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