JLG 1230ES Service And Maintenance Manual Download

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SECTION 2 - GENERAL SERVICE INFORMATION

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– JLG Lift –

2-7

2.4

LUBRICATION INFORMATION

Hydraulic System

The primary enemy of a hydraulic system is contamina-
tion. Contaminants enter the system by various means,
e.g., using inadequate hydraulic oil, allowing moisture,
grease, filings, sealing components, sand, etc., to enter
when performing maintenance, or by permitting the
pump to cavitate due to insufficient system warm-up or
leaks in the pump supply.

The design and manufacturing tolerances of the com-
ponent working parts are very close, therefore, even the
smallest amount of dirt or foreign matter entering a sys-
tem can cause wear or damage to the components and
generally results in faulty operation. Every precaution
must be taken to keep hydraulic oil clean, including
reserve oil in storage.

Cloudy oils indicate a high moisture content which per-
mits organic growth, resulting in oxidation or corrosion.
If this condition occurs, the system must be drained,
flushed, and refilled with clean oil.

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 of new
machines due to the wear-in of meshing compo-
nents.

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 1.2, LUBRICATION of
this Service Manual for an explanation of the lubricant
key designations appearing in the Lubrication Chart.

Hydraulic Oil

For best performance, JLG recommends the use of ISO-
Vg grade 15 oil with a viscosity range between 15-250
SUS at 100 degrees F

(32-54 cST at 40 degrees C)

. Refer to

Section 1.2, LUBRICATION of this Service Manual for rec-
ommended hydraulic oils.

Changing Hydraulic Oil

Use of any of the recommended hydraulic oils elimi-
nates the need for changing the oil on a regular basis. 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 sup-
plied with the machine, consult local supplier for assis-
tance in selecting the proper equivalent. Avoid mixing
petroleum and synthetic base oils. JLG Industries recom-
mends changing the hydraulic oil annually.

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.

While the unit is shut down, a good preventive mainte-
nance measure is to make a thorough inspection of all
hydraulic components, lines, fittings, etc., as well as a
functional check of each system, before placing the
machine back in service.