Global Truss ST-157 User instructions

Global Truss ST-157 User Guide
1
ST-157 PRODUCT DESCRIPTION
Thank you for choosing an ST-157 light stand from Global
Truss America. This stand has been designed to have a low loading
height, obtained by a multi-mast configuration. The telescopic
masts are made of treated steel and have been sized in order to
obtain maximum rigidity. The top mast has been designed with a
1-3/8” diameter steel tube which is standard in the industry for lifting
and supporting pro audio speaker cabinets. Special attention has
been placed on security. The spring loaded safety pins guarantee
extra security when operating the stand and as a third safety device,
each mast can be secured with a tension knob.
The ST-157 is equipped and shipped with:
A: Heavy duty casters for easy transport
B: Heavy duty steel body and base
C: Nylon guided adjustable leg brace turnbuckles
D: Galvanized steel leveling screw jack feet
E: Heavy duty steel outriggers
F: Large tension knobs
G: Manual cable winch with built in safety brake
H: Spring loaded safety pins
A
B
C
D
E
F
G
H

Global Truss ST-157 User Guide
Page 2
ST-157 TECHNICAL SPECIFICATIONS
ALL SPECIFICATION ARE SUBJECT TO CHANGE WITHOUT NOTICE
SETTING UP THE STAND
1) Place the stand in the vertical position on its wheels.
2) Ensure that the ground is firm enough to prevent the stand from
sinking. The stability of the stand is of prime importance for
secure operation. For outdoor and indoor use, 3/4” plywood
pads under each footplate is recommended.
3) Pull out the cotter pin (K) and unscrew the slider pin (L) to unlock
the leg brace slider(C). Lower the outrigger (F) from the vertical
position to a horizontal position .
4) Secure the leg brace slider (C) to the hole closes to the base on
the outrigger (F). Lock the leg brace slider (C) by attaching the
slider pin (L) and cotter pin (K) to lock the leg brace slider(C) to
the outrigger (F).
5) Repeat steps 3 and 4 on all of the outriggers (F).
6) Turn the turnbuckle counter clockwise (D) to lower the footplate
(E) so that is that it is touching the ground .
7) Turn all the turnbuckles (D) counter clockwise on each outrigger
until the base wheels are 1/2” off the ground.
Maximum Load: 150kg 330lbs.
Maximum Height: 4.8m 15`7”
Minimum Height: 1.95m 6`4”
Base Footprint: 2.13m 7`0”
Weight: 63kg 139lb
Base Dims:
Minimum Height:
22” x 17”
1.95m 6`4”
Material: Treated Steel
Finish: Epoxy Black / Electro Galvanized
L
D
K
C
F
E

Global Truss ST-157 User Guide
Page 3
RAISING THE MASTS
1) Loosen the tension knob (G) on the round telescopic mast.
2) Tighten all other tension knobs to ensure that the stand is lifting
the top round mast only. The top round mast must be raise first,
followed by the second square tube mast in sequence .
3) Pull the safety spring loaded pin (I) to unlock the top round mast.
4) Turn the winch crank (H) clockwise to raise the top mast. When
the desired height has been reached, release the safety spring
loaded pin into the positioning hole on the round mast .
5) Tighten the tension knob (G) to secure the mast and to avoid any
lateral movement and further lifting.
6) Repeat steps 1-5 with on the 2
nd
square tube mast. Loosen the
tension knob (G2) and release the safety spring loaded pin (I-2)
7) Once the desired working height has been obtained, all spring
loaded pins have been locked and the tension knobs have been
tighten, turn the winch crank handle(H) a 1/4 turn counter
clockwise to release tension from the cable.
IMPORTANT
1) All equipment that is being raised by the cranks stands
should be secured with Global Truss TUV rated clamps and
safety cables prior to raising the mast to the desired working
height.
2) One operator per stand is required when using the stands in
pairs to lift trussing.
3) Keep hands and fingers clear of the steel cable and mast
when lifting or lowering the mast.
G
G2
I
H
I
-
2

Global Truss ST-157 User Guide
Page 4
ATTACHING TRUSS
1) Attach the STSB-005 truss adapters (Sold separately) to the
round tube mast. Tighten the tension knob on the adapter to
prevent the adapter from moving or spinning.
2) Attach the truss to the truss adapters and secure the truss unto
the adapters using the pin and cotter clips on the adjustable U
brackets.
LOWERING THE MAST AND TRANSPORTING THE STAND
1) Turn the winch crank handle (H) a 1/4 turn clockwise to add
tension to the cable. Reverse the lifting the mast steps 1-6 to
lower the masts. All of spring loaded safety pins (I and I-2) must
be locked into the lowest positioning hole and tension knobs
must be tighten (G&G2).
2) Fold up the outriggers to the vertical position. All of the cotter
pins and slider pins must secure the leg brace slider to the
outriggers. Turn all of turnbuckles clockwise to make sure that
all of the outriggers stay in the vertical position.
3) Turn the winch handle (H) until the cable is tight .
4) Your stand is ready for transport.
 The steel cable must be correctly and completely rolled on the
winch to avoid crushing the fibers
 The stand must be transported in the vertical position .
G
I
I
-
2
H
G2

Global Truss ST-157 User Guide
Page 5
SAFETY NOTES
1) Carefully inspect all parts before each use.
2) Do not exceed the load limitations provided in the guide. The
weight of the truss and the equipment on the truss must be
accounted for as load being supported by the stand. The load
must be evenly distributed on the stands
3) Adequate safety measures must be taken when personnel is
working underneath the loads carried by the truss and the
stands. Safety cables and TUV rated clamps must use on all
equipment being supported by the stands.
4) All electrical devices hung on truss or T bars supported by the
stand must conform to the technical codes concerning electrical
devices.
5) The stand must only be operated in the vertical position.
6) All moving parts on the stand should be checked regularly
for damaged and wear and tear.
7) The steel cable should be checked regularly for fraying.
8) Do not use the stand if the welds or materials are cracked or if
the unit has been dropped. The structurally integrity may be
compromised.
9) Do not move the stand when it is loaded.
10) Do not use the stand to lift people.
11) Do not lean ladders on the stand.
12) Do not use the stand in extreme outdoor weather conditions.
Proper guy wiring is require when the using the stand outdoors.
13) Do not allow the stand to be used on soft surfaces.
14) Do not lubricate the winch brake. Service must be performed
by an authorized repair center.
15) The stand must be serviced and inspected a minimum
once a year by an authorized service center. Some stands
may require to be serviced more than once a year
depending on the usage .
DISCLAIMER
1) The use of trussing and lifting equipment in temporary or mobile
applications is the sole responsibility of the operator.
2) During the 12 month warranty period, Global Truss or one of our
authorized service centers will repair the stand if the damage is
attributed to faulty materials or manufacturer defects.
3) The warranty does not cover damage due to negligent handling,
overloading or parts subject to normal wear and tear.
4) The use of parts not supplied by Global Truss America or
modifications to our design by third parties will void all
warranties.