918070/FP0811
4-19
Printed in U.S.A.
c. Using the assembled tools, slowly open the
hydraulic oil filler cap (4, Figure 4-16) to allow
pressure to escape from the hydraulic system.
d. Remove the oil filler cap (4).
e. With the filter insert (5) in place, add hydraulic
oil until oil level is between the marks on sight
gauge (2).
Figure 4-16 Hydraulic Reservoir Filler Cap
Note: The hydraulic oil level varies according to
machine operating temperature. When the machine is
cold before starting, the level should be near the LOW
mark; when at normal operating temperature, the level
should be near the FULL mark.
f. Re-install hydraulic oil filter insert and filler
cap and tighten securely.
g. Replace the fuel tank/hydraulic reservoir cover
and secure it with the three screws with lock-
washers removed earlier.
h. Close the engine cover.
i. Start the engine and let it idle for a few min-
utes.
j. Check hydraulic functions. Repeat this proce-
dure to recheck the hydraulic oil level.
Changing Hydraulic Oil
1. Position the machine on a level surface.
2. Fully extend the bucket and boom, and retract arm
as shown in Figure 4-13. Lower bucket and dozer
blade to the ground. Turn off the machine.
3. Perform steps 6, a through c in “Checking Hydrau-
lic Oil Level” on page 4-17
4. Remove filter insert (5, Figure 4-16).
5. Open the reservoir drain plug and drain oil into a
suitable container. Re-install drain plug and tighten
securely.
6. Reinstall filter insert (5).
7. Fill reservoir with hydraulic oil until oil level is
between marks on sight gauge.
8. Replace the fuel tank/hydraulic reservoir cover and
secure with the three screws with lockwashers
removed earlier.
9. Close the engine cover.
10. Start the engine and let it idle for a few minutes.
Cycle all front attachment hydraulic functions and
recheck hydraulic oil level.
WARNING
The hydraulic reservoir is under pressure.
Removing the cap to quickly can cause hot
oil to be ejected from the hydraulic oil fillter
opening. Carefully loosen the oil filler cap
slowly to relieve pressure.
Machine
Condition
Temperature
Oil Level
Before Opera-
tion
Between 50 and
86
°F
(10 and
30
°C)
LOW
mark
Normal
Operation
Between 122 and
194
°F (
50 and
90
°C)
FULL
mark
WARNING
Do not overfill the hydraulic reservoir. Dam-
age to the system, high-pressure leaks and
injury can result.
4
5
IMPORTANT
Always dispose of hydraulic fluids accord-
ing to local regulations or take to a recy-
cling center for proper disposal. DO NOT
Summary of Contents for 503Z
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Page 90: ...Printed in U S A 3 44 918070 FP0811 NOTES ...
Page 94: ...Printed in U S A 4 4 918070 FP0811 Maintenance Label ...