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First Edition - Second Printing
BOOM RE-SEQUENCING (GTH4013SX & EX)
If, during normal operation, a change in the boom
extended lengths of 150 mm or more is noticed when
the boom is retracted, proceed as follows:
1.
Fully retract the telescope cylinder and keep
the retraction system under pressure (approx. 15
seconds); the boom sections should become equal.
If after performing this procedure the boom still
remains out of sequence, proceed with the steps
below:
2.
Move the boom to the zero position, fully retract
the boom and keep the retraction system under
pressure for approx. 20 seconds.
3.
Raise the boom to approx. 60° and operate the
retraction function for approx. 20 seconds.
4.
Lower the fully retracted boom to the lowest
angle possible without striking the ground and keep
the retraction system under pressure for approx. 20
seconds.
If, despite these procedures, the boom does not
return in sequence, raise the boom to approx. 60°,
fully extend and retract it to full stroke and keep
the retraction system under pressure (approx. 20
seconds) in each direction.
By following these procedures the boom re-
sequencing should be correct.
SERVICE INTERVAL
Running-in __________________________ None
Ordinary __________________ When necessary
Part No. 57.0009.0540
GTH-4013 SX - GTH-4017 SX - GTH-4013 EX - GTH-4017 EX
BOOM CHAINS TENSIONING (GTH4017SX & EX)
To tighten the boom chains, follow the instructions
below:
1.
Fully extend the boom
2.
Retract the boom by some 20/30 cm.
3.
Tighten the chain up to a maximum tension
value of 50 Nm.
4.
Check that all chains have been equally
tensioned. If not, repeat the operation described
above.
5.
Lock the chain tensioners by means of a counter-
nut and locknut.
To achieve a proper tensioning of the four lower
chains proceed as follows:
1. Tighten the first pair of chains to 30 Nm.
2. Tighten the second pair of chains to 30 Nm.
3. Alternately tighten the two pairs of chains to 5 Nm
at a time until reaching the tension value of 50 Nm.
SERVICE INTERVAL
Running-in __________________________ None
Ordinary _________________ Every
Operator's Manual
Maintenance
500
hours
115
Courtesy of Crane.Market
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