918196/EP0913
4-20
Printed in U.S.A.
Changing Hydraulic Oil
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.
5. 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). Remove the cap and the filter insert
(5).
6. Open the reservoir drain plug and drain the oil into
a suitable container. Re-install the drain plug and
tighten securely.
7. Reinstall filter insert (5).
8. Fill the reservoir with hydraulic oil until oil level is
between marks on sight gauge.
9. Re-install the hydraulic filler cap (2) and tighten
securely.
10. Start the engine and let it idle for a few minutes.
Cycle all front attachment hydraulic functions and
check the hydraulic oil level according to
“Check-
ing Hydraulic Oil Level
” on page 4-19.
Hydraulic Cooling System
The hydraulic system uses a hydraulic cooler to keep
the hydraulic fluid at the proper temperature. The
cooler is located inside the engine compartment near
the engine radiator. Inspect the cooler for leaks or dam-
age.
Pilot Valve
Checking Pilot Control Valve Filter:
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.
5. To relieve pressure, slowly loosen the breather cap
(3) with a cloth. Re-tighten the breather cap after
relieving pressure.
6. Tilt the cab/canopy according to
“Tilting the Cab
or Canopy
” on page 3-10.
7. Disconnect hose (A, Figure 4-16) connected to the
pilot control filter/restrictor fitting (B) on the side
of a joystick control valve.
IMPORTANT
The filler cap and filter assembly will be
removed over the rear cover. Protect the
rear cover from spilled or dripping hydrau-
lic fluid.
IMPORTANT
Always dispose of hydraulic fluids accord-
ing to environmental laws or take to a recy-
cling center for proper disposal. DO NOT
pour onto the ground or down a drain.
IMPORTANT
Hydraulic oil contamination can damage
pilot valve control spools. Check the pilot
control valve filter/restrictor every 1000
hours (every other oil change) and clean if
necessary. Replace the filter/restrictor if it
is damaged in any way.
IMPORTANT
Hydraulic oil will leak during procedure.
Place absorbent material under valve to
catch leaking oil. Always dispose of
hydraulic fluids according to environmental
laws or take to a recycling center for proper
disposal.
Summary of Contents for 383Z
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