JLG 510AJ Service Manual - Manual (Page 34)

SECTION 2 - GENERAL
2-4 – JLG Lift – 3121181
Hydraulic Oil
1. Refer to Section 1 for recommendations for viscosity
ranges.
2. JLG recommends Mobilfluid 424 hydraulic oil, which has
an SAE viscosity of 10W-30 and a viscosity index of 152.
NOTE: Start-up of hydraulic system with oil temperatures below -
15° F (-26° C) is not recommended. If it is necessary to start
the system in a sub-zero environment, it will be necessary
to heat oil with a low density, 100 VAC heater to a mini-
mum temperature of -15° F (-26° C).
3. The only exception to the above is to drain and fill the
system with Mobil DTE 13 oil or its equivalent. This will
allow start up at temperatures down to -20° F (-29° C).
However, use of this oil will give poor performance at
temperatures above 120° F (49° C). Systems using DTE
13 oil should not be operated at temperatures above
200° F (94° C) under any condition.
Changing Hydraulic Oil
1. Use of recommended crankcase or hydraulic oils elimi-
nates need for changing oil on a regular basis. However,
filter elements must be changed after first 50 hours of
operation and every 300 hours thereafter. If it is neces-
sary to change oil, use only oils meeting or exceeding
specifications in this manual. If unable to obtain the
same type of oil supplied with machine, consult local
supplier for assistance in selecting the proper equiva-
lent. Avoid mixing petroleum and synthetic base oils.
2. Use every precaution to keep hydraulic oil clean. If oil
must be poured from original container into another,
clean all possible contaminants from service container.
Always clean the mesh element of the filter and replace
cartridge any time system oil is changed.
3. While unit is shut down, a good preventive maintenance
measure is to make a thorough inspection of all hydrau-
lic components, lines, fittings, etc., as well as a functional
check of each system, before placing machine back in
service.
Lubrication Specifications
Specified lubricants, as recommended by component manu-
facturers, are always the best choice. However, multi-purpose
greases usually have qualities which meet a variety of single
purpose grease requirements. Should questions arise regard-
ing use of greases in maintenance stock, consult your local
supplier for evaluation. Refer to Section 1 for an explanation of
lubricant key designations appearing in Lubrication Chart.
Cylinder Drift Test
Maximum acceptable cylinder drift is to be measured using
the following methods.
Platform Drift
Measure drift of platform to the ground. Lower booms (if
equipped) slightly elevated, upper boom fully extended with
the rated load in the platform and power off. Maximum allow-
able drift is 2 inches (5 cm) in 10 minutes. If machine does not
pass this test, proceed with the following.
Cylinder Drift
Measure drift at cylinder rod with a calibrated dial indicator.
Cylinder oil must be at ambient temperature and temperature
stabilized.
Cylinder must have normal platform load applied.
If cylinder passes this test, it is acceptable.
NOTE: Information is based on 6 drops per minute cylinder leak-
age.
Table 2-2. Cylinder Drift
Cylinder Bore Diameter
Max. Acceptable Drift
in 10 Minutes
inches mm inches mm
3 76.2 0.026 0.66
3.5 89 0.019 0.48
4 101.6 0.015 0.38
5 127 0.009 0.22
6 152.4 0.006 0.15
7 177.8 0.005 0.13
8 203.2 0.0038 0.10
9 228.6 0.0030 0.08