Time VERSALIFT VST-7500-I, Руководство оператора

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5-2
29084-05 03/17 VERSALIFT VST-7500-I
EMERGENCY
OPERA
TION
MANUAL ROTATION - The rotation system can be
operated manually if the hydraulic system becomes
inoperable. Before manual rotation is attempted
remove the plugs from the motor test ports on the
dual counter-balance valve manifold located on the
rotation motor (Figure 5.4). This allows oil to be piloted
during rotation of the lift. Rotate the lift using a 7/8 in.
hex socket and ratchet to turn the input shaft on the
gearbox (Figure 5.5). 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.
Test Port Plugs
Figure 5.4
Manual Rotation
Figure 5.5
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 5.6
BACKUP PUMP (Option) - The backup pump system
provides hydraulic power from a DC pump-motor for
emergency operation of the lift in the event of a prime
power source failure.
The backup pump system should not be operated
longer than 30 seconds continuously.
Continuous
use will drain the battery and damage (over heat) the
backup pump motor.
At the upper controls,
the backup pump is operated
by an air cylinder. To activate this system push the
air cylinder plunger knob and hold it while operating
the upper control. To turn off the backup pump
release the plunger knob and allow it to return to the
neutral position.
At the lower controls,
the backup pump is operated
by a detented toggle switch. To activate this system
move the toggle to the “ON” position and operate the
appropriate control levers. To turn off the backup
pump return the toggle switch to the “STOP” position.
ENGINE START/STOP CONTROL - The engine
start/stop control can be used for emergency
operation if the truck engine (PTO models) or the
generator engine will not stay running. Operate the
aerial lift only while attempting to lower the booms.
To
conserve the battery and prevent damage to the