42 • Section 7 — Maintenance
3. Wipe off the top of the reservoir and the ller breather
cap.
Warning
Death or serious injury can result from improper
use of solvents. Follow the manufacturer’s label for
proper use and disposal.
4. Inspect the inside of the reservoir. If sludge or other
contamination is found, thoroughly clean the inside
of the tank using lint free wipes and a solvent which
leaves no residue. Change the return line lter and
clean or change the suction lter.
Notice
Only use hydraulic oil as recommended. Other uids
added to the hydraulic system can increase compo-
nent wear and affect the lubricating characteristics
of the oil.
5. Fill the reservoir with new hydraulic oil of the proper
grade. The proper oil level is between 2” and 3”
(5.08 and 7.62 cm) from the top of the tank. Do not
ll tank completely full so as to leave room for uid
expansion. Filter the oil through a 10 micron lter as
it is put into the reservoir.
6. Install the ller breather cap. If the ller breather cap
has not been replaced in one year, or is damaged,
replace it.
Notice
Oil change has been completed at step 6 for routine
oil changes. If changing oil due to contamination,
continue through step 11.
7. Cycle all cylinders, hydraulic motor and all valves to
ush contaminated oil from the lines and components
of the hydraulic system.
8. Change the return line lter cartridge and clean
the suction lter element.
9. Drain the reservoir completely.
10. Fill the reservoir with new hydraulic oil of the proper
grade. The proper oil level is between 2” and 3”
(5.08 and 7.62 cm) from the top of the tank. Do not
ll tank completely full so as to leave room for uid
expansion. Filter the oil through a 10 micron lter as
it is put into the reservoir.
11. Change the return line lter cartridge after approxi-
mately 25 hours.
Water Removal
If the hydraulic system was contaminated with water,
special water removal ltration may be necessary. An
oil supplier or a qualied laboratory can determine if
water has caused excessive oil oxidation or additive
deterioration.
If analysis shows oil deterioration beyond an accept-
able level, drain the reservoir and ush the system as
described earlier in this section. Use a water removal
ltration system during the ushing process to remove
any residual water from the system.
If the condition of the oil is acceptable except for the water
content, allow time for it to separate from the oil. Then
drain the water off the bottom of the reservoir. Circulate
the oil in the entire system through a separate water
removal lter system.
Continue this process until the water content in the oil is
reduced to an acceptable level. The preferred method
of determining the water content in the oil is laboratory
testing. Once the water content has been reduced to an
acceptable level, replace the cartridge with a new return
line cartridge.
Lubrication
Proper lubrication will extend the life of the equipment
and reduce maintenance problems. The frequency of
lubrication required will depend on the amount of use
and the conditions the unit is operated in. Operation in
extremely dusty, sandy, or rainy environments will require
more frequent lubrication. Lubricate the unit as recom-
mended by the Preventive Maintenance and Inspection
Checklist in the Appendix.
The Lubrication Chart identies each component, type of
lubricant, and method of application. Any brand of lubricant
that meets or exceeds the specications of the products
listed is acceptable. Select the appropriate interval and
lubricate the components as identied in the chart.
Always wipe grease ttings clean before and after greasing
to keep contaminants from entering the points of lubrica-
tion. To avoid bearing damage, use manually operated
grease guns. Air-driven grease guns may have enough
force to cause bearing damage.
If the unit is not used, or is stored for any length of time,
apply fresh lubricant at all points indicated on the Lubri-
cation Chart. This will help prevent corrosion during the
idle period.
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