
136 SEBU7494-06
Maintenance Section
Track (Rubber) - Inspect/Adjust
g01011091
Illustration 174
3. Loosen the jam nut and turn the adjuster in order
to align the bore of the track tensioner with the
holes in the mounting brackets on the drive frame.
4. Install the retaining pin through the holes and
install the lock pin in order to secure the retaining
pin.
5. Keep the jam nut loosened and turn the adjuster in
order to tighten the turnbuckle. The track tensioner
should be tight enough to hold the weight of the
drive frame.
g00954340
Illustration 175
6. Remove the four retaining bolts (1).
7. T urn the adjuster in order to move the drive frame
rearward. Turn the adjuster until the four bolts can
be loosely installed into the next set of mounting
holes.
8. Recheck the tension per Step 1.
If the sag that i
smeasuredis12mm(0.5inch),
install the four retaining bolts (1). Tighten the bolts
toatorqueof215±40N·m(159±30lbft).
If the sag that is measured is NOT 12 mm
(0.5 inch), repeat Step 5 through Step 8.
9. Turn the adjuster slightly in order to relieve
tension.
Note: Maintain a tension that is sufficient for retaining
the track tensioner in the stored position on the
undercarria
ge.
10. Tighten the jam nut to a torque of 270 ± 40 N·m
(199±30lbft
).
Additional Adjustment for the 287
In certain situations, the tracks for the machine a re in
usable condition but the normal adjustment procedure
will not ten
sion the track to the recommended
specification. By reversing the position of the
234-0789 Brackets, additional track tension can
be achieved
. This is possible because the slot for
the brackets is offset. Reversing the brackets will
increase the distance between the idler wheels,
which resu
lts in additional tension on the track. See
Illustration 176.
Note: In or
der to access the brackets, refer to the
procedure for removing the idler wheels in the
Operation and Maintenance Manual, “Bogie and Idler
- Inspect/
Replace”.
Reversing the four 234-0789 Brackets will increase
the dista
nce between the idler wheels by 12 mm
(0.47 inch). After you reverse the brackets and
after you reassemble the components for the
undercar
riage frame, check for proper track tension.
Refer to the procedure “Track Adjustment for the
287”.