Versalift VST-39-TN, Operator'S Manual

Page: 41 / 55

4-7 39020-02 08/16 VERSALIFT VST-39/43/50/55-TN
OPERA
TION
Remote Control Box
Figure 4.7
UPPER CONTROL OPERATION
This section describes the controls at the platform.
The standard, individual single-stick control is
presented in this section. Never allow an untrained
individual to operate the aerial lift.
DANGER:
AN UNTRAINED OR
CARELESS OPERATOR SUBJECTS HIM/
HERSELF AND OTHERS TO DEATH OR SERIOUS
INJURY.
When operating the lift all lift movements must be
started and stopped gradually.
DANGER:
NEVER REVERSE OR STOP
THE DIRECTION OF THE LIFT TRAVEL SUDDENLY
AND AVOID REACHING THE END OF THE BOOM
TRAVEL AT EXCESSIVE SPEEDS.
STRUCTURAL
DAMAGE OR INSTABILITY MAY RESULT
CAUSING DEATH OR SERIOUS INJURY.
Never operate the upper controls without using the
personnel restraint system.
DANGER:
NEVER OPERATE ANY
AERIAL EQUIPMENT WITHOUT USING AN
APPROVED PERSONNEL RESTRAINT SYSTEM
ATTACHED TO THE SAFETY RING ON THE
PLATFORM SUPPORT WELDMENT. FAILURE TO
PROPERLY SECURE THE SAFETY BELT AND
LANYARD
MAY RESULT IN DEATH OR SERIOUS
INJURY IN THE EVENT OF A FALL FROM THE
PLATFORM.
Before operating the aerial lift, the operator must be
familiar with the built-in compensation link system
that affects boom movements. The connecting
components are shown on the “Major Components”
drawing in Section 1. When the lower boom function
is activated the lower boom will respond as directed
and the upper boom will move and maintain its initial
position in relation to the turret. However, activating
the upper boom function will not affect the lower boom.
Speed and smoothness of lift operation are controlled
by feathering the control valves. Feathering a control
function allows the operator to change the speed by
adjusting how far the control is moved. Flow can be
directed to one function or multiple functions
simultaneously. Function speed depends on flow to
each valve. Regular practice will develop operator
proficiency.
SINGLE STICK CONTROL - Refer to Figure 4.8 for
clarification. This multi-jointed handle operates the
valve spools and enables the operator to control all
lift movements. The three bi-directional handle
movements (in-out, up-down, and right-left) are
illustrated on the placard mounted on top of the single-
stick control.
Lift operations are selected by depressing the safety
trigger while actuating the single stick control handle.
Slowly move the single stick lever in the desired
direction until motion begins. Further movement of
the handle in the same direction will increase the
speed of the motion. To stop a lift movement, move
the single-stick lever back to the neutral position and
release the trigger. Releasing the safety trigger in
any position except neutral will cause the selector
valve to slam shut and stop lift travel with an abrupt
jerking motion resulting in unnecessary loads and
stresses.
To operate two or more functions at the same time,
position the single-stick handle anywhere in an area
between the separate paths of the desired functions.
EMERGENCY STOP (Standard) - The primary
purpose of the emergency stop valve is to deactivate
all the upper controls in the event of a control valve
malfunction (i.e. a valve spool stuck in the open
position) or other hydraulic emergency. Push the
knob labeled “PUSH FOR EMGY. STOP”; then the
upper controls are inoperable and pressure at the tool
ports is relieved. When the emergency stop knob is
pulled up, the upper controls and tool power are
functional.
ENGINE START/STOP (Standard) - The start/stop
system has been designed so that the engine cannot