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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, such as
Mobil 424, to biodegradable fluid, such as Mobil
EAL Envirosyn H. Operate machine under normal
operating conditions for at least four (4) hours be-
fore draining.
1. Park machine on a level surface, fully raise coring
head, engage parking brake, stop engine and remove
key from the ignition switch. Secure coring head with
service latch.
2. Remove pump belt cover from machine (see Opera-
tor’s Manual).
NOTE: The hydraulic reservoir will drain when the hy-
draulic oil filter is removed from the hydraulic manifold.
3. Clean area around filter mounting area (Fig. 26). Re-
move filter from hydraulic manifold and drain reservoir
into a suitable container. Drain hydraulic system. Drain
all hoses, tubes and components while the system is
warm. Discard filter.
4. Inspect and clean reservoir (see Hydraulic Reservoir
in this section).
5. Make sure filter mounting surface is clean. Apply hy-
draulic oil to gasket on the new filter. Screw filter on until
gasket contacts mounting surface of manifold, then
tighten filter half a turn.
NOTE: Use biodegradable fluid, such as Mobil EAL En-
virosyn H, for this step if you are changing to this type of
fluid. Use only hydraulic fluids specified in Operator’s
Manual. Other fluids could cause system damage.
6. Fill hydraulic reservoir.
7. Disconnect and ground both spark plug wires to pre-
vent engine from starting.
8. Turn ignition key switch to start position; engage
starter for ten (10) seconds to prime hydraulic pumps.
Repeat this step again.
9. Reattach both spark plug wires.
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.Lower and raise coring head 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.Install pump belt cover to machine (see Operator’s
Manual).
15.Operate the machine for two (2) hours under normal
operating conditions.
16.Check condition of hydraulic oil. If the fluid shows any
signs of contamination, or if you are changing to biode-
gradable fluid, repeat steps 1 through 13 again.
17.Resume normal operation and follow recommended
maintenance intervals.
1
2
Figure 26
1. Hydraulic filter 2. Hydraulic manifold
Hydraulic
System
ProCore 648 Page 4 – 31 Hydraulic System