Printed in U.S.A.
4-19
918196/EP0913
Hydraulic System
Checking Hydraulic Oil Level
1. Position the machine on a level surface.
2. Fully extend the bucket and boom, retract the arm
and position as shown in Figure 4-14.
3. Lower the bucket and dozer blade to the ground.
Move the joysticks in all directions to verify the
hydraulic system is de-pressurized.
4. Shut off the engine. Remove the ignition key and
take it with you. Lock out the controls by raising
left control console.
Figure 4-14 Excavator Position for Checking
and Changing Hydraulic Oil
5. Check the hydraulic oil level sight gauge (1, Figure
4-15). Oil level should be approximately at the
point shown at (2).
6. If the hydraulic oil level is low:
a. Open the engine cover.
b. Slowly loosen the breather cap (3) with a cloth
to relieve pressure. Re-tighten the breather cap
after relieving pressure. Slowly open the
hydraulic oil filler cap (4) and then remove the
cap.
Note: A short hex shaft is included in the tool kit. This
tool is designed to be used with a standard ratchet
wrench to open the filler cap.
c. With the filter insert (5) in place, add hydraulic
oil until the oil level is between the marks on
sight gauge (1).
Figure 4-15 Hydraulic Reservoir
d. Re-install the hydraulic oil filter insert and
filler cap and tighten them securely.
e. Start the engine and let it idle for a few min-
utes.
f. Check hydraulic functions. Repeat this proce-
dure to recheck the hydraulic oil level. Add oil
if necessary.
WARNING
The hydraulic reservoir is under pressure.
Never use your hands to search for hydrau-
lic fluid leaks; use a piece of paper or card-
board to find leaks. Escaping fluid under
pressure can be invisible and can penetrate
the skin, causing serious injury. If any fluid
is injected into your skin, see a doctor at
once. Injected fluid MUST be surgically
removed by a doctor familiar with this pro-
cedure, or gangrene may result.
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Summary of Contents for 383Z
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