Hagie STS14, Operator'S Manual

Page: 104 / 127

7.19
VII.
SERVICE AND MAINTENANCE
G. BOLT TORQUE
HYDRAULIC TREAD ADJUST UNITS–
With the engine turned off,
visually inspect the tread bearing bolts on both the bottom and side tread
adjust bearing plates (fig. 7.19-1) every 50 hours. Torque check them every
100 hours.
To torque check the tread adjust bearing bolts:
1. Loosen the jam nut (fig. 7.19-1, item 2) on each tread adjust bearing
bolt.
2. Using an “X” pattern (fig. 7.19-2), verify that current torque on each
tread adjust bearing bolt is equivalent to the last check from 100 hours
previous.
3. Repeat pattern 3 to 4 times until last sequence shows no movement of
the bolts to achieve desired torque.
4. Tighten jam nut.
Typically a torque value of 20 to 25 foot pounds is required to stabilize
the axle and still allow tread width adjustment.
Even pressure of the tread adjust bearing plates is required for
proper operation! (fig. 7.19-3) Figure A shows the correct position of the
tread adjust bearing plates and bolts as well as the outer leg. Figure B
shows the plates when there is not even torque on each of the tread adjust
bearing bolts. Figure C shows a situation in which there is not enough
torque on the tread adjust bearing bolts. Both figure B and C will cause the
tread adjust to operate incorrectly or not at all.
FIG 7.19-1
3
2
1
4
FIG 7.19-2
1 2
Tread adjust bearing plates
leg
Tread adjust bearing bolts FIG 7.19-3
Mainframe
A B C
NOTE:
Never operate the unit with loose or
missing tread adjust bearing bolts.
NOTE:
If hydraulic tread adjustment will never be used on your machine or you
do not have hydraulic tread adjust, set all bearing bolt torque settings to
50 foot-pounds using the same procedure as stated above.
Jam nut
This is not a scaled drawing.