SECTION 2 - GENERAL
3120740
– JLG Lift –
2-3
Bearings
1.
When a bearing is removed, cover it to keep out dirt and
abrasives. Clean bearings in nonflammable cleaning sol-
vent and allow to drip dry. Compressed air can be used
but do not spin the bearing.
2.
Discard bearings if the races and balls (or rollers) are pit-
ted, scored, or burned.
3.
If bearing is found to be serviceable, apply a light coat of
oil and wrap it in clean (waxed) paper. Do not unwrap
reusable or new bearings until they are ready to install.
4.
Lubricate new or used serviceable bearings before
installation. When pressing a bearing into a retainer or
bore, apply pressure to the outer race. If the bearing is to
be installed on a shaft, apply pressure to the inner race.
Gaskets
Check that holes in gaskets align with openings in the mating
parts. If it becomes necessary to hand-fabricate a gasket, use
gasket material or stock of equivalent material and thickness.
Be sure to cut holes in the right location, as blank gaskets can
cause serious system damage.
Bolt Usage and Torque Application
1.
Use bolts of proper length. A bolt which is too long will
bottom before the head is tight against its related part. If
a bolt is too short, there will not be enough thread area
to engage and hold the part properly. When replacing
bolts, use only those having the same specifications of
the original, or one which is equivalent.
2.
Unless specific torque requirements are given within the
text, standard torque values should be used on heat-
treated bolts, studs, and steel nuts, in accordance with
recommended shop practices. (See Torque Chart Sec-
tion 1.)
Hydraulic Lines and Electrical Wiring
Clearly mark or tag hydraulic lines and electrical wiring, as well
as their receptacles, when disconnecting or removing them
from the unit. This will assure that they are correctly rein-
stalled.
Hydraulic System
1.
Keep the system clean. If evidence of metal or rubber
particles are found in the hydraulic system, drain and
flush the entire system.
2.
Disassemble and reassemble parts on clean work sur-
face. Clean all metal parts with non-flammable cleaning
solvent. Lubricate components, as required, to aid
assembly.
Lubrication
Service applicable components with the amount, type, and
grade of lubricant recommended in this manual, at the speci-
fied intervals. When recommended lubricants are not avail-
able, consult your local supplier for an equivalent that meets
or exceeds the specifications listed.
Battery
Clean battery, using a non-metallic brush and a solution of
baking soda and water. Rinse with clean water. After cleaning,
thoroughly dry battery and coat terminals with an anti corro-
sion compound.
Lubrication and Servicing
Components and assemblies requiring lubrication and servic-
ing are shown in the Lubrication Chart in Section 1.
2.3
LUBRICATION AND INFORMATION
Hydraulic System
1.
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 (suction) lines.
2.
The design and manufacturing tolerances of the compo-
nent 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. 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 evidence of metal
particles.
3.
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.
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 components.
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