Terex Genie GTH-4017 EX - Check the Re-Sequence of the Boom Telescope (GTH-4013 EX)

Section 4 - Maintenance Procedures November 2008
TABLE A
Document 57.0009.0427
GTH-4017EX GTH-4514EX GTH-4013EX
26
A-21 CHECK THE RE-SEQUENCE OF THE BOOM
TELESCOPE (GTH-4013EX)
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 With the thermal motor started, retract the boom fully
using the joystick, hold the system over relief (ap-
prox. 15 seconds); the three boom sections should
retract fully. Then, hold the system over relief for
approx. 20-40 seconds, to change the hydraulic oil
inside the system.
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 hold the retract system over relief for
approx. 20-40 seconds.
3 Extend the boom fully, retract it and hold it over relief
for approx. 60 seconds. Repeat this operation for
maximum three times.
If, despite these procedures, the boom does not return
in sequence, check the cylinders and their re-sequence
valves A. Before this procedure, disassemble the
cylinders.
A
A