MAINTENANCE PROCEDURES
WEAM009500
195
4.9.1.f
SHOE FIXING SCREWS CHECK AND TIGHTENING
(Machines equipped with steel tracks, road liners)
WARNING
q
To compensate for the inevitable settling movements, it is
indispensable to check the tightening torque of the screws
(1) after the first 30 hours of operation.
Carry out another check after the first 100 hours of run-
ning-in and, if the screws have become loose again, repeat
the check after 200 hours of operation.
q
If the screws (1) become loose and are not tightened at the
required torque, the useful life of the tracks will be shorter.
q
After tightening, make sure that the nut and the track are in
contact with the surface of the link.
The check must be carried out with the machine parked on level
ground.
Track pad fixing screws tightening
Tighten the screws with a torque of 127-142 Nm, making sure that
the nut and the track are in contact with the surface of the link.
Tightening sequence
The screw tightening sequence for each element must be 1-2-3-
4, as shown in the figure.
After tightening, make sure that the nut and the track are in con-
tact with the surface of the link.
4.9.1.g
CHECKING AND ADJUSTING THE STEEL TRACK TENSION
The pins and bushings of the undercarriage wear out to different degrees, depending on the work conditions and
on the characteristics of the surface on which the machine works. Therefore it is necessary to check the track ten-
sion frequently and to adjust it when necessary.
IMPORTANT
q
To carry out the check and the corresponding maintenance operation, stop the machine on firm and lev-
el ground. Check both tracks.
CHECK
1.
With the engine idling, move the machine forward of a
distance corresponding to the length of the track on the
ground, then lower the equipment to the ground and stop the
engine.
2.
Choose a perfectly flat rod (3) long enough to cover the
distance between the idler roller (1) and the track sliding plate
(2), then position it on the track.
3.
Measure the maximum deflection between the upper surface
of the track and the lower surface of the rod.
• Standard deflection
The deflection value “
a
“ should be included between 5 and
15 mm.
If the track tension does not correspond to the standard value, ad-
just it by proceeding as indicated below.
9JM00882
9JM00883
Summary of Contents for PC26MR-3
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Page 19: ...SAFETY AND ACCIDENT PREVENTION 17 ...
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Page 63: ...THE MACHINE AND ITS OPERATIONS 61 ...
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Page 171: ...MAINTENANCE 169 ...
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Page 227: ...TECHNICAL SPECIFICATIONS 225 ...
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Page 235: ...AUTHORISED EQUIPMENT 233 ...
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Page 252: ... 2008 KOMATSU UTILITY EUROPE S p A All Rights Reserved Printed in Europe 01 2008 ...