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XLB-4319
3-8
3-3 EMERGENCY LOWERING
The XLB-4319 Boom Lift is equipped with two manual lowering valves and a hydraulic
hand pump. These devices can be used to lower the basket in case of a power failure, a
load shift, or other emergency situation.
The manual lowering valves are located on the upper and lower boom lift cylinders and
are manually operated from the ground. The hydraulic hand pump is located in the work
basket. Use the hand pump in case an assistant is not available on the ground.
To lower the work basket from the ground, push in the valve plunger (Figure 3-6) on the
lower boom lift cylinder. Continue pushing the valve plunger to fully retract the lower
boom. Push in and hold the valve plunger on the upper boom lift cylinder until the upper
boom is retracted.
VALVE
PLUNGER
Figure 3-6. Manual Lowering Valve
To manually lower the boom lift from the work basket, push the upper or lower boom
operator lever (Figure 3-7) down and use the hand pump to lower the boom. Apply a
steady up-and-down pumping action. The hydraulic cylinders are dual acting; boom
motion will continue throughout pump handle operation.
HAND
PUMP
BOOM OPERATOR
LEVERS
Figure 3-7. Basket Control Station