Great Plains NTA3007HD Operator Manual - Manual (Page 126)

122 NTA907HD or NTA3007HD
166-207M 04/04/2011
Brake Shoe Replacement
Check brakes for wear, contamination and damage sea-
sonally or every 9600 km (6000 miles).
1. Prior to commencing work, review the safety infor-
mation on page 121. Have necessary safety equip-
ment and tools on hand. Make sure workers
understand the hazards and how to avoid them.
2. Review the entire procedure. Great Plains suggests
performing a complete operation on one wheel, or
one pair of wheels, at a time, so that there are fully-
assembled wheels to use as an assembly reference.
3. Spot the drill on a level surface. Unfold the drill.
4. Block the wing and rear drill tires to prevent move-
ment. Do not set the drill’s own parking brakes, as
the drums cannot be removed with the brakes set.
Refer to Figure 133
5.
If left hitched, put the tractor transmission in Park,
release tractor service and parking breaks, and dis-
connect the trailer brakes at the hitch. Set tractor
parking brake only after trailer brake disconnection.
If unhitched, release air brakes by opening dump
valve
. Pull down on cap to release. Push up.
6. Jack up and support one or both drill transport axles.
7. Be wearing and using recommended safety equip-
ment for the remainder of these procedures.
8. Spin the wheels, checking for evidence of excess
run-out at the braking surface of the drums.
9. Remove wheels. If you have more than one wheel
removed at a time, mark on them where they came
from (L/R and inside/outside), as the tire tread pat-
tern is directional.
Refer to Figure 134
10. Remove hub/drum assemblies:
Remove the dust cap .
Remove the spindle cotter pin .
Remove the spindle nut .
Remove the spindle washer .
11. Carefully pull hub and drum assembly from spin-
dle. Outer bearing may fall loose.
12. Inspect inner seal , bearings, hub and drum for
wear and damage - for drum, see “Brake Drum
Maintenance” on page 126).
13. Keep inner and outer bearing components sepa-
rated. They are different parts.
Possible Asbestos Hazard:
If you are unable to confirm that you are removing and install-
ing Great Plains approved parts, you may have linings that
contain asbestos. Some aftermarket brake shoes may contain
asbestos, and require strict, complex and costly safety proce-
dures not covered in this manual.
If shoe replacement is indicated, use only parts supplied or
recommended by Great Plains. The original brake linings, and
Great Plains supplied or approved linings contain no asbestos.
Unapproved parts may also appear to fit, but will not function
correctly.
Note: Inspection of the brakes may also reveal a need to
refinish drums and/or replace other brake parts. Al-
though not strictly part of brake maintenance, you
may need to repack bearings (generally the outer),
and it may be necessary to replace a worn or dam-
aged inner seal (and repack the inner bearing).
1
Null4:
Figure 133
Air Brake Dump Valve
31377
1
Null4:
Figure 134
Hub Removal
29642
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4
5
6
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8
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