Versalift VO-452-MHI, Operator'S Manual

Page: 42 / 50

5-2
39049-01 01/17 VERSALIFT VO-452/455/460-MHI
EMERGENCY
OPERA
TION
Actuating the lower rotation control lever will reduce
the effort required to rotate the lift.
If manual rotation is used, test port plugs must be
replaced on counter-balance valve manifold. See
“Responsibilities after Emergency Operation” at the
end of this chapter.
After manual rotation is completed, it is extremely
important to close the bleeder ports and refill the
reservoir with a suitable hydraulic oil. Operate the
aerial lift from the lower controls for several cycles to
fill the hydraulic components with oil and then refill
the oil reservoir if required.
Test Port Plugs
Figure 5.4
OUTRIGGER BOOM INTERLOCK MANUAL
OVERRIDE –
In the event of diverter valve failure, and
the lift becomes inoperable with an operator aloft,
the outrigger boom interlock selector can be overridden
to lower the booms and return the operator to the
ground. To activate the manual override, locate the
solenoid operated 3-way valve, usually in the pedestal.
On the end of the valve, there is a small tab (Fig. A)
which can be pressed with a small screwdriver,
capscrew, etc. With this tab pressed down, hydraulic
flow will be diverted from the outriggers to the lift.
Another operator can then operate the lower controls
to lower the booms.
WARNING:
USE OF MANUAL
OVERRIDE TO OPERATE THE LIFT WITHOUT THE
OUTRIGGERS DEPLOYED CAN RESULT IN
SERIOUS INJURY OR DEATH.
Outrigger Boom Interlock Manual Rotation
Figure 5.5
BACKUP PUMP (Optional) - The backup pump
system provides hydraulic power from a DC pump-
motor for emergency lowering of the lift in the event of
a prime power source failure. (Refer to Section 4 for
operating procedure).
ENGINE START/STOP CONTROL - The engine
start/stop control can be used for emergency
operation if the prime power source fails. Operate
the aerial lift only while attempting to stow the booms.
(Refer to Section 4 for operating procedure).
INJURED OR INCAPACITATED OPERATOR - If the
operator is unable to operate the aerial lift, determine
if any damage has occurred to make the lift
inoperable. If the aerial lift is operable, move the
platform away from the danger and into the shortest
clear path of descent to get the operator on the
ground. If an equipment defect is suspected, do
not
allow anyone to enter the platform. If the situation
allows safe operation from the lower controls,
override the upper controls and carefully lower the
platform to the ground. See the title, “Control Selector”
near the beginning of this chapter for specific
instructions on overriding the upper controls. If the
aerial lift is not operable, use another aerial lift to
rescue the operator from the platform or consider one
of the other emergency procedures presented in this
chapter.
HYDRAULIC LINE FAILURE - Hydraulic line failure
during aerial lift operation presents numerous
hazards. Be aware that a hydraulic oil mist caused
by a leak or hydraulic line failure is conductive even
though a non-conductive oil is used.
DANGER:
AVOID HIGH PRESSURE
HYDRAULIC OIL SPRAY. THIS SPRAY OR MIST
CAN PUNCTURE OR BECOME EMBEDDED
BENEATH THE SKIN OR CONTAMINATE THE
EYES. THESE CONDITIONS REQUIRE
IMMEDIATE MEDICAL ATTENTION.