JLG 19AMI (3120758) Service Manual - Manual (Page 12)

SECTION 1 - SPECIFICATIONS
1-2 – JLG Lift – 3120758
1.4 TORQUE REQUIREMENTS
When maintenance becomes necessary or a fastener has
loosened, refer to the Torque Chart, Figure 1-2. to deter-
mine proper torque value.
1.5 LUBRICATION
Hydraulic Oil
Hydraulic oils must have anti-wear qualities at least to API
Service Classification GL-3, and sufficient chemical stabil-
ity for mobile hydraulic system service. JLG Industries,
recommends Mobilfluid 424 hydraulic oil, which has an
SAE viscosity of 10W-30 and a viscosity index of 152.
For cold weather applications, i.e. when temperatures
remain consistently below +20°F (–7°C) JLG recom-
mends using Mobil DTE 13 hydraulic oil.
Aside from JLG recommendations, it is not advisable to
mix oils of different brands or types, as they may not con-
tain the same required additives or be of comparable vis-
cosities. If use of hydraulic oil other than Mobilfluid 424 is
desired, contact JLG Industries for proper recommenda-
tions.
Lubrication Specifications
1.6 HYDRAULIC PRESSURE ADJUSTMENT
(See Figure 1-1.)
Adjust system pressure so that platform will raise with
rated capacity in platform.
Turning adjustment screw clockwise, increases system
pressure, turning screw counterclockwise, decreases
system pressure.
Do not adjust system pressure higher than required to
raise the load. Make pressure adjustment with oil at nor-
mal operating temperature. If pressure is set when oil is
cold, platform may not raise rated load after oil has
warmed.
1.7 CYLINDER SPECIFICATIONS
NOTE: Dimensions shown are inches (in.), with the metric
equivalent, centimeters (cm), shown in parentheses.
1.8 SERIAL NUMBER LOCATIONS
For machine identification, a serial number plate is affixed
to the machine. The plate is located on the back of the
mast, just above the mast support bracket. In addition,
should the serial number plate be damaged or missing,
the machine serial is stamped on the mast.
Table 1-1. Hydraulic Oil Operating Range
HYDRAULIC SYSTEM OPERATING
TEMPERATURE RANGE
SAE VISCOSITY
GRADE
+0˚ F to +180˚ F
(-18˚ C to +83˚ C)
10W
+0˚ F to +210˚ F
(-18˚ C to +99˚ C)
10W-20, 10W-30
+50˚ F to +210˚ F
(+10˚ C to +99˚ C)
20W-20
Table 1-2. Lubrication Specifications
KEY SPECIFICATIONS
MPG - Multipurpose Grease having a minimum dripping point
of 350° F. Excellent water resistance and adhesive qual-
ities, and being of extreme pressure type. (Timken OK
40 pounds minimum.)
EPGL - Extreme Pressure Gear Lube (oil) meeting API service
classification GL-5 or MIL-Spec MIL-L-2105.
HO - Hydraulic Oil. ISO-Vg grade 32, 46.
CL - Chain Lube. Use a good quality chain lubricant
Figure 1-1. Hydraulic Pressure Setting - Adjustment
Screw Located at Base of Pump Motor
(Remove Hex Head Cap as Shown)
Table 1-3. Cylinder Specifications
DESCRIPTION
BORE
in./(cm)
STROKE
in./(cm)
ROD DIA.
in./(cm)
Lift Cylinder -
15AMI - AC & DC 1.63
(4.14)
56.50
(143.50)
1.38
(3.50)
PRESSURE
ADJUSTMENT
SCREW
HYDRAULIC
OIL TANK
GROUND
CONTROL
STATION
COVER
ADJUSTMENT
SCREW CAP
(SHOWN REMOVED)