Flush Hydraulic System
IMPORTANT: Flush the hydraulic system any time
there is a severe component failure or the system is
contaminated (oil appears milky, black or contains
metal particles).
8. Disconnect wire harness connector from engine run
solenoid to prevent the engine from starting.
9.
for ten (10) seconds to prime pump. Let starter cool and
then repeat cranking procedure again.
Turn ignition key switch to start and engage starter
IMPORTANT: Flush hydraulic system when chang-
Ing from petroleum base hydraulic fluid to a biode-
gradable fluid. Operate machine under normal
operating conditions for at least four (4) hours be-
fore draining.
10.Connect
noid.
wire harness connector to engine run sole-
11.
Start engine and let it idle at low speed (1425 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.
1.
decks, stop engine and engage parking brake. Remove
key from the ignition switch.
Park machine on a level surface. Lower cutting
12.Raise
and lower cutting decks several times. Turn
steering wheel fully left and right several times.
CAUTION
13.Move
PTOswitch toONtoengage cutting decksand
let them run for several minutes. Move PTO switch to
OFF.
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil. Controls must be operated with the
ignition switch inOFF.Remove key from the igni-
tion switch.
14.Shut
off engine and check for hydraulic oil leaks.
Check oil level in hydraulic reservoir and add correct
amount of oil if necessary.
IMPORTANT: Make sure to clean around any hy-
draulic connections that will be disconnected for
draining.
15.Operate
erating conditions.
machine for two (2) hours under normal op-
16.Check
condition of hydraulic oil. If the new fluid
2.
Drain hydraulic reservoir into a suitable container.
shows any signs of contamination, repeat steps 1
through 14 again until oil is clean. If changing to biode-
gradable fluid, repeat steps 1 through 14 again at least
once and until the oil is clean.
3.
components while the system is warm.
Drain hydraulic system. Drain all hoses, tubes and
4.
5.
Change and replace both hydraulic oil filters.
17.Assume
maintenance intervals.
normal operation and follow recommended
Inspect and clean hydraulic reservoir (see Hydraulic
Reservoir Inspection inthe Service and Repair section).
6.
that were disconnected while draining system.
Connect all hydraulic hoses, lines and components
NOTE: Use only hydraulic fluids specified in the Trac-
tion Unit Operator’s Manual. Other fluids may cause
system damage.
7.
Fill hydraulic reservoir with new hydraulic fluid.
Groundsmaster 4500--D/4700--D
Page 4 -- 69
Hydraulic System
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