May 2015
84 GTH 4016 R - GTH 4018 R - GTH-5021 R Part No.
57.0009.0607
Second Edition - First Printing
Maintenance
Re-Sequencing the Telesopic
Boom (only for GTH-4016 R)
If, during normal operation, a change in the boom
extended lengths of 150mm 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 strinking 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).
By following these procedures the boom re-
sequencing should be correct.
