
SEBU8213-04 121
Maintenance Section
Hydraulic System Oil - Change
At operating temperature, the hydraulic tank is hot
and under pressure.
Hot oil and components can cause personal in-
jury. Do not allow hot oil or components t o c ontact
skin.
Remove the filler cap only when t he engine is
stopped, and the filler cap is cool enough to touch
with your bare hand. Remove the filler cap slowly
in order to relieve pressure.
Operate the machine for a few minutes in order to
warm the hydraulic system oil.
Park the machine on level ground. Lower all
attachment to the ground. Move the parking brake
switch to the ENGAGED position. Stop the engine.
Note: The Hystat transmission and the hydraulic
systemuseacommontank.
NOTICE
Care must be taken to ensure that fluids are contained
during performance of inspection, maintenance, test-
ing, adjusting and repair of the product. Be prepared to
collect the fluid with suitable containers before open-
ing any compartment or disassembling any compo-
nent containing fluids.
Refer to Special Publication, NENG2500, “Caterpillar
Dealer Service Tool Catalog” for tools and supplies
suitable to collect and contain fluids on Caterpillar
products.
Dispose of all fluids according to local regulations and
mandates.
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Illustration 169
Left view of new tank (oil filler c ap)
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Illustration 170
1. Remove hydraulic tank filler cap that is above
the access door on the rear of the machine, if
equipped.
g01259694
Illustration 171
2. Remove the oil drain access cover on the bottom
plate.
3. Hook a hose up to the drain valve of the hydraulic
tank and drain the hydraulic oil into a suitable
container.
4. Install the oil drain access cover on the bottom
plate .
5. Change the hydraulic system filters. Refer to
Operation and Maintenance Manual, “Hydraulic
System Oil Filter - Replace”.
6. Fill the hydraulic system oil tank. Refer to
Operation and Maintenance Manual, “Lubricant
Viscosities” and Operation and Maintenance
Manual, “Capacities (Refill)”.