JLG 3246ES Service Manual - Manual (Page 32)

SECTION 2 - GENERAL
2-4 – JLG Lift – 3121166
2.3 LUBRICATION AND INFORMATION
Hydraulic System
1. The primary enemy of a hydraulic system is con-
tamination. Contaminants enter the system by var-
ious means, e.g., using inadequate hydraulic oil,
allowing moisture, grease, filings, sealing compo-
nents, sand, etc., to enter when performing main-
tenance, or by permitting the pump to cavitate
due to insufficient quantity of oil in supply tube.
2. The design and manufacturing tolerances of the
component working parts are very close, there-
fore, even the smallest amount of dirt or foreign
matter entering a system can cause wear or dam-
age to the components and generally results in
faulty operation. Every precaution must be taken
to keep hydraulic oil clean, including reserve oil in
storage. Hydraulic system filters should be
checked, cleaned, and/or replaced as necessary, at
the specified intervals required in the Lubrication
Chart in Section 1. Always examine filters for evi-
dence of metal particles.
3. Cloudy oils indicate a high moisture content which
permits organic growth, resulting in oxidation or
corrosion. If this condition occurs, the system must
be drained, flushed, and refilled with clean oil.
4. It is not advisable to mix oils of different brands or
types, as they may not contain the same required
additives or be of comparable viscosities. Good
grade mineral oils, with viscosities suited to the
ambient temperatures in which the machine is
operating, are recommended for use.
NOTE: Metal particles may appear in the oil or filters of new
machines due to the wear-in of meshing compo-
nents.
Hydraulic Oil
1. Refer to Section 1 for recommendations for viscos-
ity ranges.
2. JLG recommends DTE11 hydraulic oil, which has
an SAE viscosity of 10W-30 and a viscosity index of
152.
NOTE: Start-up of hydraulic system with oil temperatures
below -15°F (-26°C) is not recommended. If it is nec-
essary to start the system in a sub-zero environment,
it will be necessary to heat the oil with a low density,
electrical heater to a minimum temperature of -15°F
(-26°C).
Changing Hydraulic Oil
1. Use of any of the recommended crankcase or
hydraulic oils eliminates the need for changing the
oil on a regular basis. However, filter elements
must be changed annually unless operating in
extreme conditions. If it is necessary to change the
oil, use only those oils meeting or exceeding the
specifications appearing in this manual. If unable
to obtain the same type of oil supplied with the
machine, consult local supplier for assistance in
selecting the proper equivalent. Avoid mixing
petroleum and synthetic base oils. JLG Industries
recommends changing the hydraulic oil annually.
2. Use every precaution to keep the hydraulic oil
clean. If the oil must be poured from the original
container into another, be sure to clean all possible
contaminants from the service container. Always
replace the filter and clean magnet any time the
system oil is changed.
3. While the unit is shut down, a good preventive
maintenance measure is to make a thorough
inspection of all hydraulic components, lines, fit-
tings, etc., as well as a functional check of each sys-
tem, before placing the machine back in service.
NOTE: Refer to section 4 for oil checking and oil changing
procedure.
Lubrication Specifications
Specified lubricants, as recommended by the compo-
nent manufacturers, are always the best choice, how-
ever, multi-purpose greases usually have the qualities
which meet a variety of single purpose grease require-
ments. Should any question arise, regarding the use of
greases in maintenance stock, consult your local sup-
plier for evaluation. Refer to Section 1 for an explanation
of the lubricant key designations appearing in the Lubri-
cation Chart.