Great Plains NTA3007 Operator Manual - Manual (Page 144)

140 NTA907 or NTA3007 Table of Contents Index Great Plains Manufacturing, Inc.
166-371M Table of Contents Index 2012-07-02
Refer to Figure 146
14. Inspect brake shoe
origin. See Warning at right.
Great Plains supplied shoes are stamped “AL-KO”
on the web face and have bonded linings.
15. Clean brake dust from assembled parts, and from
individual parts as removed.
16. Inspect brake linings . Check for 1.6 mm (
1 ⁄
16
in.)
minimum thickness (exclude thickness of shoe pad),
and absence of grease, contamination, deep scores,
chipping, or excessive heat fractures. Hairline heat
fissures are not unusual and do not require shoe
replacement.
17. Inspect brake shoe retaining and operating
hardware. Check for wear or damage to holes, pins
and springs. Check for weak springs. Springs must
completely retract shoes when brakes are released.
Note: Sound practice is to replace springs when
replacing brake shoes.
18. Check wheel cylinder for evidence of leaks.
If no parts need replacing, skip to step 48.
Refer to Figure 147
19. Remove self-adjuster cotter pins
. Release
self-adjuster pawl and remove adjuster .
20. As necessary, disassemble adjuster for cleaning.
Inspect adjust pawl and rack for wear and damage.
Great Plains recommends replacing the entire
adjuster if any parts are worn or damaged.
21. Apply thin film of Lubriplate 110 or similar to
self-adjuster.
Do not allow any lubricants to come in contact with new brake
linings.
22. Release upper spring between shoes (was under
self-adjuster), and release lower spring between
shoes.
23. Loosen nuts on lower shoulder bolts. Push brake
shoes outward at bottom (to allow removal of hand
brake
a
arms).
24. Release lower spring between hand brake arms.
If this spring differs from the shoe springs, set the
hand brake spring aside.
25. Remove hand brake arm assembly . Place
spring with it.
a. Hand brakes are not used on these drill models.
Part Failure Hazard:
Do not substitute parts. Incorrect or substandard parts can
cause brake malfunction or failure, resulting in death, serious
injury or property damage. Always re-assemble brakes with
either the removed parts (if serviceable) or Great Plains parts
as specified in the Parts Manual (166-371P).
Figure 146
Brake Shoe ID & Thickness
29643
8
9
8
9
1
2 3
Figure 147
Brake Spring Removal
29642
1
2
3
5
4
6
8
9
7
4
5
6
8
9
8