Versalift VO-452-MHI Operator's Manual page 43

A hydraulic line leak can create a vacuum in a closed
line; in some cases, the 'vacuum' may become
conductive. Furthermore, most hydraulic oils are
flammable. Another danger to personnel is bodily
contact with hot oil. The operator and the ground
crew must be alert for these hazards to avoid injury.
DANGER:
BETWEEN HYDRAULIC OIL AND SOURCES OF
HIGH HEAT OR OPEN FLAMES. DEATH OR
SERIOUS INJURY MAY RESULT FROM A FIRE.
WARNING:
HYDRAULIC OIL MAY CAUSE SERIOUS BURNS
WHICH REQUIRE IMMEDIATE MEDICAL
ATTENTION.
A quick response to hydraulic line failure is
important if the operator is to be safely removed from
the platform. The examples below describe some
emergency operating procedures for some specific
types of hydraulic line failures.
1. The aerial lift uses holding valves to lock the
position of the booms in the event of a complete
hydraulic line failure.
2. If there is a continuous loss of hydraulic oil from
the aerial lift, operate the hydraulic power source
only while attempting to stow the aerial lift to
conserve the hydraulic oil. If operation of any
aerial lift function is not possible, then use the
bleeder ports and the manual rotation procedure
described earlier.
3. A hydraulic line failure between the upper and
lower controls may temporarily allow continued
operation of the aerial lift. The rate of the hydraulic
oil loss can be reduced by overriding the upper
controls and operating the aerial lift with the lower
controls. If only part of the hydraulic oil is lost
use of the aerial lift or some functions may be
possible. If the oil supply is depleted, discontinue
operation of the hydraulic power source to
minimize damage to the hydraulic pump. If aerial
lift functions are inoperable, use of the bleeder
ports or manual rotation will be required. A quick
response to this type of hydraulic line failure can
simplify the steps required to lower the platform
and remove the operator.
ENGINE FAILURE - If the prime power source fails,
the optional backup pump system can be used for
emergency operation. If this system is not installed,
VERSALIFT VO-452/455/460-MHI
AVOID ANY CONTACT
CONTACT WITH HOT
use the engine start/stop control to crank the engine
as previously explained. The bleeder ports and manual
rotation must be used if backup pump and the start/
stop system are not installed.
HYDRAULIC PUMP FAILURE - If the primary
hydraulic pump fails use the backup pump system, if
so equipped. If this feature is not installed, the bleeder
ports and manual rotation must be used.
CONTROL VALVE FAILURE - If aerial lift motion
cannot be stopped use the emergency stop, upper
control override, or engine start/stop control to halt
the lift functions.
Upper Control - Push the knob labeled "PUSH FOR
EMGY. STOP". When the emergency stop knob is
pushed down, the upper controls are inoperable and
pressure at the tool ports is relieved.
Lower Controls - The aerial lift may be operated by
overriding the upper controls with the control
selector.
Engine Start/Stop Control - The engine start/stop
control, at the upper, lower, or cab controls, can be
used to stop the engine and hydraulic flow to the lift
functions.
RESPONSIBILITIES
OPERATION:
After any emergency situation it is the responsibility
of the operator to make sure the aerial lift is repaired
and adjusted by the service department before it is
used again.
If an equipment defect is suspected, do not allow
anyone to operate the aerial lift or enter the platform.
If the bleeder ports are used they must be
retightened and the hydraulic reservoir must be
refilled. The aerial lift must then be operated, from
the lower controls, through its full range of motion
several times. Check the hydraulic oil reservoir level
and refill if necessary.
5-3
AFTER EMERGENCY
39049-01 01/17