Great Plains NTA2007 Operator Manual - Manual (Page 132)

128 NTA607 or NTA2007 Table of Contents Index Great Plains Manufacturing, Inc.
166-372M Table of Contents Index 2012-01-05
Refer to Figure 115
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).
Check for 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 116
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.
Brake Slippage Hazard:
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
parking brake spring aside.
25. Remove hand brake arm assembly . Place
spring with it.
a. The hand/parking brake feature is not used on Model NTA607 or NTA2007 drills.
8
9
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 (166-372P).
Figure 115
Brake Shoe ID & Thickness
29643
8
9
1
2 3
Figure 116
Brake Spring Removal
29642
1
2
7
3
5
4
6
8
9
4
5
6
8
9
8