Summit 3522a manual Boom Lift Control Panel Ground

BIL-JAX 3522A

The hydraulic power unit uses a 24 Volt, one horsepower DC motor to drive the hydraulic pump. The DC motor is powered by four 6 Volt DC, 245 Amp-hour deep charge batteries connected in series. A 25 Amp, automatic onboard battery charger is provided with standard models for recharging the batteries at the end of each work period.

Two control panels (Figure 2-2) use pushbutton switches and hydraulic valves to control the direction and speed of boom lift and rotation. One set of operator controls is provided for ground operation and another set is provided for operation from the platform. Elevation and rotation controls are operational only when the outriggers are correctly extended and the moving boom section is within a programmed safe operating zone.

Figure 2-2. Boom Lift Control Panel (Ground)

The ground and platform control panels include CHOKE and START buttons for use with boom models equipped with an optional DC/gasoline hybrid generator for continuous duty. Battery condition indicators show the charge state of the batteries. When pressed, a STOP button at each control panel immediately stops all boom motions. The ground control panel includes a lighted text window that displays the present operating status or an existing error condition. The platform control panel includes a horn button that sounds an audible alarm when pressed.

Boom elevation, extension and rotation speeds are selected from low to high by SPEED buttons. The lift and extension cylinders have load-holding valves in the base of each cylinder in case of a hydraulic hose failure.

Only one boom motion is permitted at a time and only as long as the boom is within the safe operating zone (Figure 2-3). When a selected boom motion exceeds a safe operating limit, the boom motion ceases and another boom motion must be selected within the safe operating zone.

Figure 2-3. Range of Motion

Outrigger load sensing switches and level sensing interlocks prevent all platform boom operations until the four outriggers are properly extended, the trailer is level and the full weight of the boom lift is loaded onto the outriggers. A boom-raised interlock prevents outrigger operation until the platform boom is fully lowered to the stowed position.

Safety devices prevent the boom from retracting suddenly in the event of a hydraulic hose or system failure. It is strongly recommended that no one adjust or tamper with these safety devices. If service is required, please notify Bil-Jax for instructions.

Each cylinder rod is fully immersed in oil to prevent rust or corrosion of the cylinders during storage. It is important that the cylinder rods be kept clean and undamaged for the protection of the cylinder head packings.

In the event of power loss, control system failure or other malfunction, all boom movement functions may be accomplished by manual operations.

Manual lowering of the platform is performed by actuating valve plungers found on the base of each boom lift cylinder. Pushing and holding each valve retracts the corresponding boom lift cylinder. The boom may need to be rotated to a clear area before lowering.

Manual boom retraction and turntable rotation are accessed inside the pump compartment. The hand pump and selected valves on the hydraulic pump unit are used for these functions.

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