Flush Hydraulic System - Toro Groundsmaster 7200 Service Manual

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: 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.
WARNING
Before disconnecting or performing any work on
the hydraulic system, all pressure in the system
must be relieved. See Relieving Hydraulic System
Pressure in the General Information section.
2. Park machine on a level surface. Lower cutting deck
(or implement), stop engine and engage parking brake.
Remove key from the ignition switch.
IMPORTANT: Make sure to thoroughly clean around
all hydraulic connections that will be disassembled.
3. Drain hydraulic tank and transmission.
4. Drain hydraulic system. Drain all hoses, tubes and
components while the system is warm.
5. Remove and replace hydraulic oil filter.
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
(see Hydraulic Hose and Tube Installation in the Gener-
al Information section of this chapter).
Hydraulic System
IMPORTANT: Use only hydraulic fluids specified in
Operator's Manual. Other fluids may cause system
damage. Use of biodegradable hydraulic fluid in
Groundsmaster 7200 and 7210 machines is not rec-
ommended.
8. Fill hydraulic tank with new hydraulic fluid.
9. Disconnect wire harness connector from engine fuel
stop solenoid to prevent the engine from starting. Make
sure traction levers and lift control lever are in the neu-
tral position.
10.Turn ignition key switch to START and engage start-
er for ten (10) seconds to prime the transmission and
gear pump. Repeat this step again.
11. Connect wire harness electrical connector to fuel
stop solenoid.
12.Start engine and let it run at low idle speed (1500 to
1650 RPM) for a minimum of 2 minutes. Increase engine
speed to high idle (3200 to 3250 RPM) for a minimum
of 1 minute under no load.
13.Raise and lower cutting deck (or implement) several
times.
14.Shut off engine and check for hydraulic oil leaks.
Check oil level in hydraulic tank and add correct amount
of oil if necessary.
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 15 again until oil is clean.
17.Assume normal operation and follow recommended
maintenance intervals.
Page 4 – 44 Groundsmaster 7200/7210