JLG 1230ES Service Manual - Manual (Page 28)

SECTION 2 - GENERAL SERVICE INFORMATION
2-6 – JLG Lift – 3121222
Bearings
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.
Discard bearings if the races and balls (or rollers) are pit-
ted, scored, or burned.
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.
Lubricate new or used serviceable bearings before instal-
lation. 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
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 origi-
nal, or one which is equivalent.
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 or the Torque Chart Figures
in Section 1 of this Service Manual.
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
reinstalled.
Hydraulic System
Keep the system clean. If evidence of metal or rubber par-
ticles is found in the hydraulic system, drain and flush the
entire system.
Disassemble and reassemble parts on clean work sur-
face. Clean all metal parts with non-flammable cleaning
solvent. Lubricate components, as required, to aid assem-
bly.
Lubrication and Servicing
Components and assemblies requiring lubrication and
servicing are shown in Section 1.2, LUBRICATION. Ser-
vice applicable components with the amount, type, and
grade of lubricant recommended in this manual, at the
specified intervals. When recommended lubricants are not
available, consult your local supplier for an equivalent that
meets or exceeds the specifications listed.
Batteries
Clean batteries, using a non-metallic brush and a solution
of baking soda and water. Rinse with clean water. After
cleaning, thoroughly dry batteries and coat terminals with
an anti-corrosion compound.
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 compo-
nent working parts are very close, therefore, even the
smallest amount of dirt or foreign matter entering a system
can cause wear or damage to the components and gener-
ally 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.