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MAINTENANCE
HYDRAULIC SYSTEM - CHANGE OIL, REPLACE
SUCTION STRAINERS AND PULSATION DAMPER
Vent Hydraulic pumps
1. Open vent plug (13), illust. Z 22513 on the pump suction port
of all six main pumps.
2. As soon as bubble free oil flows out, tighten the vent plug
(13).
3. Open vent screw on secondary pumps (8 and 9), illustration
Z 21171. Close vent screw as soon as bubble free oil flows
out.
4. Open vent plug (13) on the pump suction port of the piggy-
back gear pumps and wait until bubble free oil flows out then
tighten the vent plugs (13).
5. Check hydraulic oil level and the whole hydraulic system for
leakage.
Check the Oil level in all six Main Pump Housings (I - VI),
illust. 21171:
1. Remove leakage oil return line from port (15). The oil level in
the pump housing should reach the lower edge of port (15).
2. If necessary add hydraulic oil up to the lower edge of the filler
opening.
3. Connect leakage oil return line to port (15).
NOTICE
Make sure the main pump housings are correctly filled, oth-
erwise the pump drive shaft bearings could be damaged due
to lack of lubrication.
4.13 EVERY 2000 OPERATING HOURS OR YEARLY
475
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