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OPERATION
A - Pumping the oil from the Suction Oil Reservoir into the
Main Oil Reservoir
1. Close main valve (8), illustration Z25100.
2. Open cock (2), position (O).
REMARK
In order to prevent build-up of a vacuum in the suction sys-
tem, open the vent plug on the suction pipe of each main hydrau-
lic pump, see page 411 for more information.
3. Switch on pump (1) with switch (4).
When changing the hydraulic oil, be sure to evacuate the
main oil reservoir via the service arm connector simulta-
neously with the transfusion procedure. Otherwise overfilling
of the main oil reservoir. Observe oil level at sight gauge (9).
4. When the suction oil reservoir is empty or after completion of
the maintenance job switch off transfer pump (1) with switch
(4). Close cock (2), position (C) and open main valve (8).
5. With the main shut-off valve (8) open, the suction oil reservoir
will be filled with oil from the main oil reservoir. Let the vent
plugs on the main pumps open to allow the air to escape from
the suction oil reservoir and hoses.
6. The suction oil reservoir and the suction hoses are filled,
when bubble free oil flows out at the vent plugs on each main
pump. Close the vent plugs.
7. Check oil level in the main reservoir. Fill up with new hydraulic
oil as necessary.
8. Start the engine and run at low idle speed to allow trapped air
to be removed from the hydraulic system.
DO NOT start the engine when the suction oil reservoir is
empty.
B - Pumping the Oil from the Return Oil Collector Pipe into
the Main Reservoir
1. To empty the return oil collector pipe, open cock (3).
2. Switch on transfer pump with switch (4).
3. Observe oil level at sight gauge (9). As soon as the oil level
remains constant the return oil collector pipe is empty. Now
switch off the transfer pump (1) and close cock (3).
NOTICE
During normal operation the valves (2 and 3) must be in
closed position (C).
CAUTION
3.20 TRANSFER PUMP FOR HYDRAULIC OIL
231
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