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3 — OPERATION
3-7
3-3 EMERGENCY LOWERING
The XLB-4725A Boom Lift is equipped with a manual emergency lowering valve that
can lower the basket in case of a power failure or an emergency situation. The emergency
lowering valve is located at the front of the hydraulic power compartment.
To lower the work basket, pull out the valve plunger knob (Figure 3-4). Continue to pull
out on the plunger to lower the basket. Only the upper boom lift cylinder will retract.
PLUNGER
Figure 3-4. Emergency Lowering Valve
3-4 MANUAL BOOM ROTATION
The boom lift is equipped with an emergency rotation handle (crank) that can be used to
rotate the boom in case of a power failure or other emergency situation.
Use the following procedure to manually rotate the boom:
1. Loosen the crank stowage tube thumbscrew (Figure 3-5).
2. Remove the crank.
3. Install the crank on the hex end of the worm gear drive screw as shown.
4. Turn the crank handle to rotate the boom.
CRANK
STOWAGE
TUBE
CRANK
IN USE
THUMBSCREW
Figure 3-5. Boom Rotation