Flushing Hydraulic System - Toro Greensmaster 3200 Service Manual

Flushing 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. Lower cutting
units, stop engine, and engage parking.
CAUTION
Operate all hydraulic controls to relieve sys-
tem pressure and avoid injury from pressur-
ized hydraulic oil. Controls must be oper-
ated with the ignition switch in RUN and the
engine OFF. Return ignition switch to OFF
when pressure has been relieved. Remove
key from the ignition switch.
2. Clean area around hydrostat and pump inlet hose.
Clamp pump inlet hose. Remove hose from hydrostat,
release clamp, and drain reservoir into a suitable con-
tainer. Drain hydraulic system. Make sure lift cylinders,
hoses, and tube lines are drained while the system is
warm. Discard filter (Fig. 65).
3. Clean oil filter mounting area. Remove filter and
drain into a suitable container. Discard filter (Fig. 66).
4. Inspect and clean reservoir (see Inspecting Reser-
voir Parts).
5. Make sure filter mounting surface is clean. Apply
hydraulic oil to gasket on the new filter. Screw filter on
until gasket contacts mounting plate, then tighten filter
half a turn.
Note: Use only hydraulic fluids (including biodegrad-
able) specified in Checking Hydraulic System Fluid in
General section. Other fluids could cause system dam-
age.
6. Reconnect all hydraulic hoses and lines that were
disconnected prior to draining. Fill hydraulic reservoir.
7. Disconnect electrical connector to the fuel stop so-
lenoid to prevent engine from starting on diesel engine.
Lift all spark plug leads on gas engine.
8. Turn ignition key switch; engage starter for 10 se-
conds to the prime pump. Repeat this step again.
Greensmaster 3200/3200–D
9. Connect electrical connector to the fuel stop sole-
noid on diesel engine. Connect all spark plug leads on
gas engine.
10. Start engine and let it idle at low speed for a mini-
mum 2 minutes. Increase engine speed to high idle for
minimum of 1 minute under no load.
11. Raise and lower cutting units several times.
12. Shut off engine and check for hydraulic oil leaks.
Check oil level in hydraulic reservoir and add correct oil
if necessary.
13. Operate the machine for 2 hours under normal oper-
ating conditions.
14. Check condition of hydraulic oil. If the flushing fluid
shows any signs of contamination, or if you are changing
to biodegradable fluid, repeat steps 1 through 14 again.
15. Assume normal operation and follow recom-
mended maintenance intervals.
PUMP INLET HOSE
HYDRAULIC OIL FILTER
Page 5 – 81
Figure 65
Figure 66
Hydraulic System