JLG 1100S Service Manual - Manual (Page 246)

SECTION 5 - HYDRAULICS
5-24 – JLG Lift – 3121256
5.3 HYDRAULIC TANK
The hydraulic tank has a capacity of 55 gallons (208 liters)
and includes the hydraulic return filter and two suction
strainers. It is normal for the oil level to appear low when
the boom is raised and should only be checked with the
machine on level ground and with the boom fully retracted
and lowered. The hydraulic oil should be maintained at
the full level as shown by the decal and hydraulic oil level
gauge located on the side of the tank as shown in Figure
5-26., Hydraulic Oil Level Gauge. This decal shows the
proper full level for both hot and cold oil. Do not fill the
hydraulic tank past the appropriate full mark. Overfilling
can cause the oil to overflow from the top of the hydraulic
tank during emergency lowering operations.
5.4 PRESSURE SETTING PROCEDURE
NOTE: The following procedures cover both 1100S and
1100SJP models. Some procedures will not be
applicable to both machines.
Cold temperatures have a significant impact on pressure
readings. JLG Industries Inc. recommends operating the
machine until the hydraulic system has warmed to normal
operating temperatures prior to checking pressures. JLG
Industries Inc. also recommends the use of a calibrated
gauge. Pressure readings are acceptable if they are within
± 5% of specified pressures.
To ensure all pressures are set correctly, the following pro-
cedures must be followed in order.
1. All applicable steps in Section 5.7, Drive & Function
Pump Start Up Procedures must be followed.
2. Set up of the function pump.
3. Adjustments made at the main valve bank.
4. Adjustments made at the platform valve.
Set Up of the Function Pump
HIGH PRESSURE RELIEF - 3400 PSI (234.4 BAR)
1. Install a high pressure gauge at the MP port of the
main valve block.
2. Using a screwdriver, remove the Din connector from
the lift down coil.
3. Activate lift down. The gauge should read 3400 psi
(234 bar).
Figure 5-26. Hydraulic Oil Level Gauge
FULL LEVEL (HOT OIL)
FULL LEVEL (COLD OIL)