Emergency boom lowering, Part l, Loss of engine power or hydraulic pump failure – Lull 644E-42 Operation Manual User Manual

Page 100: Clear the area around the vehicle of all personnel, Block all four wheels, Part ll hydraulic line failure, Warning, Emergency operations

Model 644E

Origin 3/04

Emergency Operations

This section discusses emergency boom lowering procedures:

Part l: In case of loss of engine power or hydraulic pump failure.

Part ll: In case of hydraulic line failure.

Part l

Loss of Engine Power or Hydraulic Pump Failure

IMPORTANT! In the event of total loss of engine power or hydraulic pump failure
with an elevated load, the situation must be properly evaluated and dealt with on an
individual basis. Contact your local Lull Distributor or the JLG Service Department
at (877) 554-5438 or (717) 485-6657 for specific instructions for your particular
situation.

In any event, the vehicle should be secured until the situation has been properly
evaluated. Secure the vehicle by following the procedures below:

1. Clear the area around the vehicle of all personnel.

2. Block all four wheels.

3. Section off a large area under the boom with string or tape to restrict any

personnel from entering this potentially dangerous area.

4. Temporarily block up or support the outer boom so it cannot be lowered.

5. If the load is in a position where it can be removed safely, completely

remove the load from the carriage, otherwise leave the load in place.

6. Place an accident prevention tag on both the ignition switch and steering

wheel. If you do not have a safety tag, place tape over the ignition switch.

Part ll Hydraulic Line Failure

In case of hydraulic line failure, there are step-by-step procedures available to assist
you in safely retracting and then lowering the boom. Read Part II from start to finish
before performing any of these procedures so you fully understand the process and
the danger involved. If you are unsure about any part of these procedures contact
your local Lull Distributor or the JLG Service Department at (877) 554-5438 or
(717) 485-6657 for specific instructions for your particular situation.

IMPORTANT! For boom retract and lower, the hydraulic lines MUST be replaced,
then retract and lower the boom in its normal fashion.

IMPORTANT! Be aware that the boom must first be retracted and then lowered to
avoid vehicle tipover.

Emergency Boom Lowering

WARNING:

DO NOT get under a raised boom unless the boom

is blocked up. Always block the boom before doing any servicing that
requires the boom to be up.