JLG 19BD Service Manual - Manual (Page 14)

SECTION 1 - SPECIFICATIONS
1-2 – JLG Lift – 3121154
1.5 HYDRAULIC PRESSURE ADJUSTMENT
(See Figure 1-1.)
Set hydraulic pressure to 1700 PSI as a starting point.
Adjust system pressure so that platform will raise to full
height with maximum 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.
1.6 CYLINDER SPECIFICATIONS
NOTE: All dimensions are given in inches (in), with the met-
ric equivalent, centimeters (cm), given in parenthe-
ses.
1.7 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.
1.8 LUBRICATION
(Figure 1-2. and Table 1-4 show required points of lubrica-
tion for this machine.)
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
Figure 1-1. Hydraulic Pressure Setting - Adjustment
Screw Located at Base of Pump Motor
(Remove Hex Head Cap as Shown)
Table 1-1. Cylinder Specifications
DESCRIPTION
BORE
in./(cm)
STROKE
in./(cm)
ROD DIA.
in./(cm)
Lift Cylinder -
15BD 1.50
(3.81)
56.50
(143.50)
1.375
(3.50)
Lift Cylinder -
19BD 1.63
(4.14)
53.50
(135.89)
1.375
(3.50)
PRESSURE
ADJUSTMENT
SCREW
HYDRAULIC
OILTANK
GROUND
CONTROL
STATION
COVER
ADJUSTMENT
SCREWCAP
(SHOWNREMOVED)
Table 1-2. 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 1-3. 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.