Service manual

Groundsmaster 3280--D/3320 Hydraulic SystemPage 5 -- 29
Flush 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).
1. Park machine on a level surface. Lower cutting deck
(or implement), stop engine, engage parking brake and
remove key from ignition switch.
2. Drain hydraulic reservoir (front axle) (see Traction
Unit Operator’s Manual).
3. Clean area around hydraulic filter mounting area.
Remove and discard hydraulic filter.
4. Drain entire hydraulic system. Drain all hoses, tubes
and components while the system is warm. Flush hoses
and tubes to remove any contamination.
IMPORTANT: If a failure occurred in the traction cir-
cuit, traction circuit component disassembly and
thorough cleaning may be required to remove con-
taminates from the traction circuit. Because the
traction circuit is a closed loop, any contamination
will remain in the circuit and can cause additional
component damage unless it is removed.
5. Make sure hydraulic filter mounting surface is clean.
Apply clean hydraulic oil to gasket on new filter. Screw
filter on until gasket contacts mounting plate, then tight-
en filter half a turn.
IMPORTANT: Use only hydraulic fluids specified in
Traction Unit Operator’s Manual. Other fluids could
cause system damage.
6. Fill hydraulic reservoir (front axle) (see Traction Unit
Operator’s Manual).
7. Perform the following to prevent engine from start-
ing:
A. Disconnect electrical connector to the fuel stop
solenoid on Groundsmaster 3280--D machines.
B. Disconnect and ground all engine spark plug
wires on Groundsmaster 3320 machines.
8. Make sure traction pedal is in neutral and the P.T.O.
switch is off. Turn ignition key switch to start; engage
starter for ten (10) seconds to prime hydraulic pump.
Repeat this step again.
9. Connect fuel stop solenoid (Groundsmaster
3280--D) or spark plug w ires (Groundsmaster 3320) to
allow engine to start.
10.Start engine and let it idle at low speed for a minimum
of two (2) minutes.
11.Increase engine speed to high idle for minimum of
one (1) minute under no load.
12.Rotate steering wheel in both directions several
times. Raise and lower cutting deck (or implement) sev-
eral times.
13.Shut off engine and check for hydraulic oil leaks.
Check oil level in hydraulic reservoir (front axle) and add
correct oil if necessary.
14.Operate the machine for two (2) hours under normal
operating conditions.
15.Check condition of hydraulic oil. If the fluid shows any
signs of contamination, repeat steps 1 through 14 again.
16.Resume normal operation and follow recommended
maintenance intervals.
Hydraulic
System