Flush Hydraulic System - Toro Greensmaster TriFlex 3320/3420 Service Manual

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).
IMPORTANT: Flush hydraulic system when chang-
Ing from petroleum base hydraulic fluid. Operate
machine under normal operating conditions for at
least four (4) hours before draining.
1. Park machine on a level surface, engage the parking
brake, lower the cutting units and stop the engine. Re-
move key from the ignition switch.
CAUTION
Before continuing further, read and become fa-
miliar with General Precautions for Removing
and Installing Hydraulic System Components in
this section.
2. Clean area around gear pump suction (inlet) hose
(Fig. 31). Clamp pump inlet hose. Remove inlet hose
from gear pump, release clamp and drain reservoir into
a suitable container. Drain entire hydraulic system while
making sure lift cylinders, hydraulic hoses, hydraulic
tubes and all other components are drained from low
points while the system is warm.
3. Clean oil filter mounting area. Remove filter and
drain into a suitable container. Discard filter.
4. Inspect and clean reservoir (see Hydraulic Reservoir
in this section).
5. Make sure filter mounting surface is clean. Apply
clean hydraulic oil to gasket on the new filter. Screw filter
on until gasket contacts mounting plate, then tighten fil-
ter an additional 3/4 turn.
NOTE: Use only hydraulic fluids (including biodegrad-
able fluid) specified in the Traction Unit Operator's
Manual. Other fluids could cause system damage.
6. Connect all hydraulic hoses and lines that were dis-
connected prior to system draining (see Hydraulic Hose
and Tube Installation in the General Information section
of this chapter).
7. Fill hydraulic reservoir with new hydraulic oil.
Greensmaster 3320/3420
8. Disconnect appropriate electrical component(s) to
prevent the engine from starting:
A. On machines with gasoline engine, disconnect
both spark plug wires from spark plugs.
B. On machines with diesel engine, disconnect wire
harness electrical connector from the engine fuel
stop solenoid.
9. Turn ignition key switch and engage starter for ten
(10) seconds to the prime pump. Return ignition switch
to off and wait one (1) minute to allow starter to cool. Re-
peat step a second time.
10.Reconnect engine electrical component(s) that were
disabled in step 8 above.
11. Start engine and let it run at low idle speed for a mini-
mum of two (2) minutes. Increase engine speed to high
idle for a minimum of one (1) minute under no load.
12.Raise and lower cutting units several times.
13.Shut off engine and check for hydraulic oil leaks.
Check oil level in hydraulic reservoir 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 new fluid
shows any signs of contamination or if you are changing
to biodegradable fluid, repeat steps 1 through 14 again.
16.Assume normal operation and follow recommended
maintenance intervals.
1
1. Gear pump
Page 5 - - 47
2
Figure 31
2. Suction (inlet) hose
Hydraulic System