Versalift VST-8000-I Operator'S Manual Download

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5-2

39026-03 02/17

VERSALIFT VST-8000/8500/9000/9500-I

EMERGENCY

OPERA

TION

MANUAL ROTATION

- If all the hydraulic power

sources becomes inoperable, the lift rotation system
can be operated manually.  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. Be
prepared for a ﬂ ow of oil escaping from the motor test
ports.  Rotate the lift by using a 7/8 in. hex socket
and a ratchet to rotate the input shaft on the gearbox.
(Figure 5.5)  Actuating the lower rotation control lever
will reduce the eﬀ ort 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 the section.

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 ﬂ ow 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 O P E R AT E T H E L I F T W I T H O U T T H E
OUTRIGGERS DEPLOYED CAN RESULT IN
SERIOUS INJURY OR DEATH.

Outrigger Boom Interlock Manual Rotation

Figure 5.6

BACKUP PUMP (Optional)

- 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