Flush Hydraulic System - Toro Sand Pro 2020 Service Manual

Flush Hydraulic System

IMPORTANT: Flush 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 attach-
ments, stop engine, and engage parking.
CAUTION
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil. Controls must be operated with the
ignition switch in OFF. Remove key from the igni-
tion switch.
IMPORTANT: Make sure to clean around any hy-
draulic connections that will be disconnected for
draining.
2. Drain hydraulic tank (see Hydraulic Tank Removal).
3. Make sure lift cylinder, lift valve, hydrostat, oil cool-
er, wheel motors, hoses, and tube lines are drained into
a suitable container while the system is warm.
4. Remove oil filter and drain into a suitable container.
Discard filter (see Change Hydraulic System Fluid and
Filter).
5. Inspect and clean tank (see Hydraulic Tank Inspec-
tion).
6. Install new oil filter and drain into a suitable contain-
er. Discard filter (see Change Hydraulic System Fluid
and Filter).
NOTE: Use only hydraulic fluids (including biodegrad-
able) specified in Checking Hydraulic System Fluid.
Other fluids may cause system damage.
7. Reconnect all hydraulic hoses, lines, and compo-
nents that were disconnected prior to draining.
8. Fill hydraulic tank with new hydraulic fluid (see
Change Hydraulic System Fluid and Filter).
9. Disconnect both spark plug leads from spark plugs.
10. Turn ignition key switch; engage starter for 10 se-
conds to the prime hydrostat. Repeat this step again.
Sand Pro 2020/3020/5020
11. Connect both spark plug leads to spark plugs.
12. Start engine and let it idle at low speed (1750 + 50
RPM) for a minimum 2 minutes. Increase engine speed
to high idle (3150 + 50 RPM) for minimum of 1 minute
under no load.
13. Raise and lower attachments several times.
14. Shut off engine and check for hydraulic oil leaks.
Check oil level in hydraulic tank and add correct 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, or if you are changing
to biodegradable fluid, repeat steps 1 through 16 again.
17. Assume normal operation and follow recom-
mended maintenance intervals.
Page 4 – 47 Hydraulic System (Rev. A)