JLG DVSP Series Service Manual - Manual (Page 16)

SECTION 1 - MACHINE SPECIFICATIONS
1-4 – JLG Lift – 3121136
Hydraulic Pressure Gauge Connection
ONLY OPEN HYDRAULIC SYSTEM LINES WITH THE MAST FULLY
LOWERED TO RELIEVE PRESSURE IN THE SYSTEM. CAREFULLY
LOOSEN REQUIRED FITTINGS, WEAR SAFETY PROTECTION
EQUIPMENT WHEN WORKING WITH HYDRAULIC SYSTEMS.
Remove the hydraulic oil filter and install a t-fitting between
the pump and the extend line to connect a hydraulic pres-
sure gauge as shown in Figure 1-2., Typical Hydraulic Pres-
sure Gauge Installation (Hydraulic Filter Removed).
CHECK, and if necessary, ADJUST the hydraulic pressure to
initial settings shown in table at the beginning of this section.
Cycle the hydraulic system several times with the maximum
load capacity in the platform, then recheck pressure setting.
When pressure has stabilized continue to "After Filter Pres-
sure Check" following.
After Filter Pressure Check
Reinstall the hydraulic oil filter and install the t-fitting
between the hydraulic filter and the extend line to the cylin-
der. Recheck the hydraulic pressure and compare with the
previous readings when filter was removed. If a significant
drop in pressure reading has occurred, replace the hydrau-
lic filter and recheck the "after filter" pressure reading.
1.7 CYLINDER SPECIFICATIONS
NOTE: All dimensions are given in inches (in), with the met-
ric equivalent, centimeters (cm), given in parenthe-
ses.
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 column.
1. Pressure Gauge Assembly 3. T- Fitting
2. Extend Line 4. Return Line
Figure 1-2. Typical Hydraulic Pressure Gauge
Installation (Hydraulic Filter Removed).
2
3
1
4
1. Hydraulic Oil Filter 3. Pressure Gauge Assembly
2. T- Fitting 4. Extend Line
Figure 1-3. Typical Hydraulic Pressure Gauge
Installation (After Hydraulic Filter).
Table 1-4. Cylinder Specifications
DESCRIPTION
BORE
in./(cm)
STROKE
in./(cm)
ROD DIA.
in./(cm)
15DVL/15DVSP -
Lift Cylinder 1.63
(4.10)
41.50
(105.4)
1.375
(3.49)
20DVL/20DVSP -
Lift Cylinder 1.63
(4.10)
54.0
(137.1)
1.375
(3.49)
1
2
3
4