Installing The Wire Rope; Releasing And Closing The Jaws - Tractel Group tirfor/griphoist TU-8 Manual De Empleo Y Mantenimiento

that there are no obstructions around the machine
which could prevent the wire rope, the machine and
anchor from operating in a straight line. It is therefore
recommended to use a sling of an appropriate capacity
between the anchor point and the machine (Fig. 3).
WARNING : Any rigging arrangement which
requires the calculation of the forces applied should be
checked by a competent engineer, with special attention
to the appropriate strength of fixed point used.
For work such as guiding the trunk in tree felling, the
operator should ensure that he is outside the danger
area by passing the wire rope around one or more
return pulleys.
The capacity of the machine may be increased consi-
derably for the same effort by the operator by using mul-
tiple sheave blocks. (See the examples set out in Figs.
6.1 and 6.2).
The increase in the capacity shown is reduced depen-
ding on the efficiency of the pulleys.
The diameter of the pulleys used should be equal to at
least 18 times the diameter of the wire rope. (Refer to
the applicable regulations).
For any rigging arrangement other than those descri-
bed in this manual, please consult TRACTEL
competent specialist engineer before operating the
machine.
3. INSTALLATING THE WIRE ROPE
N.B. When handling the wire rope it is recommended to
protect the hands by using work gloves.
If the wire rope is to be anchored to a high anchor point,
the wire rope should be anchored before fitting the wire
rope in the machine.
1. Uncoil the wire rope in a straight line to prevent
loops or kinks.
2. Release the internal mechanism (See section 4:
«Releasing and engaging the jaws»).
3. Insert the wire rope through the rope guide at the end
opposite to the anchor point (hook or anchor pin).
4. Push the wire rope through the machine, and if
necessary, helping it by operating the forward ope-
rating lever.
5. When the wire rope appears through the anchor
point, pull the slack wire rope through the machine,
to the point required.
6. Engage the jaws by operating the rope release
mechanism (See section 4 : «Releasing and enga-
ging the jaws»).
7. Anchor the TIRFOR machine or the wire rope to the
®
appropriate fixed point (See section 5 : «Anchoring»)
taking care to ensure that the anchor point ( hook or
pin, depending on the model) is correctly fixed.
8. Extend the telescopic operating handle until the
spring locks into position. If necessary twist the two
sections of the handle, one inside other, to align the
spring (Fig. 1 p. 2).
9. Replace the telescopic operating handle on the
chosen operating lever (forward or reverse) and
twist the handle to ensure that it is locked in position
(about a half turn).
After this procedure, the machine is ready for operation,
providing the load is correctly anchored to the machine
or the wire rope (See section 5 : «Anchoring» and sec-
tion 2 «Rigging arrangements»).

4. RELEASING AND CLOSING THE JAWS

Each machine is fitted with a lever (Fig. 1 p. 2) for relea-
sing the jaw mechanism which should only be operated
when the machine is not under load.
There are two positions for the rope release lever (See
Fig. 7, 8 and 9) : released or engaged.
N.B. When not in operation, it is recommended that the
rope release lever should be in the engaged position.
® , or a The machine must therefore be released before attemp-
ting to feed in the wire rope.
4.1. TU-8 or TU-16 (Fig.7)
Releasing :
1. Completely press the rope release safety catch (5)
and lift the rope release lever (4).
2. Release the safety catch and continue to lift the rope
release lever until it locks into position. The internal
mechanism is in the released position.
Engaging :
1. Lift the rope release lever slightly.
2. Press and maintain pressure on the rope release
safety catch, allowing the release lever to slowly tra-
vel back to its original position. Release the safety
catch. The release lever locks in position under the
effect of its spring.
4.2. TU-32 (Fig.8)
Place the anchor point against a support.
Releasing :
1. Completely press rope release safety catch (5) and push
the rope release lever (4) towards the anchor point.
2. Release the safety catch and continue to push the
rope release lever until it locks into position. The
internal mechanism is in the released position.
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