JLG 20VP (3120728) Service Manual - Manual (Page 22)

SECTION 2 - SERVICE PROCEDURES
2-4 – JLG Lift – 3120728
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.
Hydraulic Oil
For best performance, JLG recommends the use of ISO-
Vg grade 32, 46 oil with a viscosity range between 15-250
SUS at 100 degrees F (32-54 cST at 40 degrees C). Refer
to Section 1-5 of this Service Manual for recommended
hydraulic oils.
Changing Hydraulic Oil
Use of any of the recommended hydraulic oils eliminates
the need for changing the oil on a regular basis. If it is nec-
essary 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 syn-
thetic base oils. JLG Industries recommends 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.
Lubrication Specifications
Specified lubricants, as recommended by the component
manufacturers, are always the best choice, however,
multi-purpose greases usually have the qualities which
meet a variety of single purpose grease requirements.
Should any question arise regarding the use of greases in
maintenance stock, consult your local supplier for evalua-
tion. Refer to Table 1-3 in this Service Manual for an expla-
nation of the lubricant key designations appearing in the
Lubrication Chart.
2.4 POSITIONING LIFT FOR ACCESS TO
COMPONENTS LOCATED UNDER THE
BASE FRAME
Access to the underside of the VP lift can be obtained by
lifting the machine with a fork lift truck, using the fork lift
pockets in the base frame.
Lifting with a Fork Truck (See Figure 2-1.)
1. Choose a fork lift truck capable of safely handling
the full weight of the machine.
2. Locate work area on a firm, level surface.
KEEP MACHINE LEVEL OR SLIGHTLY TILTED TOWARD FORKLIFT
TRUCK WHEN LIFTING TO PREVENT MACHINE FROM SLIDING
OFF LIFTING TINES.
3. When lifting with a fork truck, lift only using the fork
lift-truck pockets running the length of the machine’s
base frame from rear to front.
4. After lifting machine to desired work height, place
support stands under the machine. The support
stands must reach from the floor to the bottom of the
machine and be capable of safely handling the
weight of the machine.
Figure 2-1. Accessing Machine Underside
Components by Lifting with a Fork Truck.
PLACE
SUPPORT
STAND
BETWEEN
MACHINE
AND
FLOOR
LIFT USING ONLY THE
FORK LIFT POCKETS
RUNNING THE LENGTH
OF THE BASE FRAME