Hydraulic Pressure Settings And Adjustment - JLG 15MVL Series Service Maintenance Manual

4.8 PUMP-MOTOR ASSEMBLY - SERVICE
PROCEDURE

Hydraulic Pressure settings and Adjustment

Adjust system pressure so that platform will raise with
maximum rated capacity in platform.
The following pressure setting are factory recommended
(initial) settings;
MODEL
15MVL/15MSP
20MVL
20MSP
Turning adjustment screw clockwise increases system
pressure, turning screw counterclockwise decreases
system pressure. (See Figure 4-6., Hydraulic Pressure
Adjustment Screw. (Machine Rear Covers Removed))
Perform pressure adjustment with oil at normal operating
temperature. If pressure is set when oil is cold, platform
may not raise rated load after soil has warmed.
1
1. Remove Adjust Screw Cap
Note: Machine rear covers must be removed to access pump motor.
Figure 4-6. Hydraulic Pressure Adjustment Screw.
(Machine Rear Covers Removed)
3121231
PRESSURE SETTING
2600 PSI
1800 PSI
2800 PSI
2
2. Pressure Adjustment Screw
SECTION 4 - CONTROL COMPONENTS
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 pressure gauge as shown in Figure 4-7., Typical
Hydraulic Pressure 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 Pressure Check" following.
1. Pressure Gauge Assembly
2. Extend Line
Figure 4-7. Typical Hydraulic Pressure Gauge
Installation (Hydraulic Filter Removed).
– JLG Lift –
4
1
3. T- Fitting
4. Return Line
3
2
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