SECTION 2 - GENERAL
2-4
– JLG Lift –
3121623
Hydraulic Oil
Refer to Section 1 for recommendations for viscosity
ranges.
Changing Hydraulic Oil
1.
Filter elements must be changed after the first 50
hours of operation and every 300 hours (unless
specified otherwise) thereafter. 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 hydrau-
lic 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
clean the mesh element of the filter and replace the
cartridge 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.
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.
2.4
CYLINDER DRIFT TEST
Maximum acceptable cylinder drift is to be measured
using the following methods.
Cylinder Drift
Drift is to be measured at the cylinder rod with a cali-
brated dial indicator. The cylinder oil must be at ambi-
ent temperature and temperature stabilized.
The cylinder must have the normal load, which is the
normal platform load applied.
If the cylinder passes this test, it is acceptable.
Table 2-2. Cylinder Drift
CYLINDER BORE DIAMETER
MAX ACCEPTABLE DRIFT
IN 1 MINUTE
INCHES
MM
INCHES
MM
2.1
55
0.02
0.53
2.3
60
0.021
0.54
2.5
65
0.013
0.35
2.7
70
0.026
0.68
2.9
75
0.013
0.35
3.1
80
0.011
0.29
3.7
95
0.009
0.23
3.9
100
0.007
0.2
4.5
115
0.005
0.15
4.9
125
0.004
0.12
6.1
155
0.002
0.07
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