User's Manual Part 1

14
14
The GS820 System
The GS820 System
2.4b GS075 Installation
1. Optional Bracket: Position the optional mounting
bracket on the boom. Bolt or weld securely.
2. Attach one end of the chain assembly to the
optional bracket or to the boom and the other
end to the eye bolt of the GS075. Tighten all the
chain links of the chain assembly.
3. Remove the hair pin and the clevis pin and
open the back end of the GS075. Install the
GS075 around the cable and then put the clevis
pin back in.
4. Adjust chain length as required, see sub-section
Chain length adjustment.
5. Test system function.
2.4c Chain length adjustment
1. Chain length adjustment № 1 – minimum boom
angle
a. At minimum boom angle, with no
additional weight on the hook block and
one part of line only, lift the boom just
enough to have the hook block suspend
and clear the sensor chain and weight.
b. Hoist slowly until the buzzer sounds. Note
the hoisting distance remaining; this
distance must be great enough to allow
the operator and the lockout system, if
installed, to prevent a two-block event. If
necessary, add chain between the sensor
and weight to increase warning distance.
If still insufficient, contact your service
representative.
2. Chain length adjustment № 2 – maximum boom
angle
a. Raise the boom to the maximum angle.
b. Hoist slowly as described in Step 1.b. Verify
that the warning distance is equal to or
greater than that determined at the
minimum boom angle.
3. Chain length adjustment № 3 – speed test:
Lower the boom until the weight height becomes
visually clear to the operator. Repeatedly create
two-block, progressively hoisting faster, to
ensure that the warning and lockout work within
acceptable amount of time and distance.
Increase the length of the chain if needed.
B) Hook block stops
rising, two-block
prevented with
safety margin
Boom
base
A) Anti-two-block
switch triggers
two-block alarm
Boom
base
Figure: Chain length test at minimum angle
B) Hook block stop
s
rising, two-block
prevented with
safety margin
Boom
base
A) Anti-two-block
switch triggers
two-block alarm
Boom
base
Figure: Chain length test at maximum angle
GS075
Increase
Increase
GS050
weight
Figure: Chain length adjustment
Eye bolt
Clevis pin
Figure: Install the GS075 around the cable
IMPORTANT!
GS050: to increase chain length, only use
lightweight chain.
!
!