JLG X20JPLUS, Operator, Safety, Maintenance And Service Manual

Page: 158 / 206

156 Boom Lift Models X20JPLUS
MAINTENANCE MUX20JP021602
12.8.MAINTENANCE ON RUBBER TRACKS
12.8.1.Rubber tracks tension check
Stop the machine on a flat and solid ground. Raise the machine off the ground sa ‐
fely and, if needed, support it by applying stable blocks or jack stands under the
undercarriage frame. In correspondence with the undercarriage central roller,
measure distance ʺ A ʺ of the bottom of the roller to the hard internal part of the
rubber belt. Track tension is normal if measure ʺ A ʺ is between 10 and 15 mm. If
the tension is not within the above measure, or too tight, please follow the proce ‐
dure illustrated in the following paragraph.
As an alternative to the above ‐ mentioned procedure, you can follow the procedu ‐
re below. In this case, the check is less accurate and precise. However, effective
for evaluating if the rubber track is too slack.
Stop the machine on a flat and solid ground. In correspondence of the upper skid
of the carriage, measure distance a of the bottom of the skid to the hard internal
part of the rubber belt, lifting the belt manually. The track tension is normal if me ‐
asure ʺ A ʺ is between 10 and 15 mm. If the tension is not within the above measu ‐
re, or too tight, please follow the procedure illustrated in the following
paragraph.
Fig. 158 Tensioning check 1
Fig. 159 Tensioning check 2