TM 9-2320-260-20
1
8-4. PARKING BRAKESHOE MAINTENANCE (Contd)
c. Cleaning and Inspection
Do not use a dry brush or compressed air to clean brakeshoes.
There may be asbestos dust on brakeshoes which can be danger-
ous to your health if you breathe it. (Brakeshoes must be wet,
and use soft bristle brush.)
Drycleaning solvent is flammable and will not be used near open
q
flame. Use only in well-ventilated places. Failure to do so may
result in injury to personnel.
1.
Clean all parts with drycleaning solvent. Remove dirt and corrosion. Do not saturate brakeshoe
lining or brakedrum with drycleaning solvent.
2.
Measure inner brakeshoe (4) and outer brakeshoe (5) lining thickness at most worn point.
Replace if thickness is .188 in. (4.78 mm) or less. (Brakeshoes are repaired at direct support level
maintenance.)
Inspect inner brakeshoe (4) and outer brakeshoe (5) linings for loose or missing rivets, cracks,
3.
breaks, and stripped threads. Replace if rivets are loose or missing. Replace inner brakeshoe (4)
or outer brakeshoe (5) if cracked, broken, or threads are stripped.
4.
Inspect brake lever (1) for cracks, breaks, and loose pins (2). Replace if cracked, broken, or pins (2)
are loose. Pins (2) must be perpendicular to brake lever (1). Ring grooves of pins (2) must be free of
chips and burrs.
5.
Slot in eccentric pin (9) must be square. Replace eccentric pin (9) if slot is darnaged.
6.
Mounting pin (13) must be tight in inner brakeshoe (4) and ring grooves free of chips and burrs.
Replace mounting pin (13) if damaged.
7.
Inspect lever retracting spring (18) and brakeshoe retracting spring (19) for broken and distorted
coils. Replace if coils or hook ends are distorted or damaged.
Inspect jamnut (16) and adjusting nut (15) for stripped threads and burred flats. Replace
8.
jamnut (16) or adjusting nut (15) if flats are burred or threads are stripped.
Inspect screw (25) for breaks, cracks, and stripped threads. Replace screw (25) if broken, cracked,
9.
or threads are stripped.
Inspect brake cable (14) for cracks, bends, and stripped threads. Replace brake cable (14) if cracked,
10.
bent, or threads are stripped.
1.
Install two lubrication fittings (3) on inner brakeshoe (4) and outer brakeshoe (5), if removed.
2.
Install mounting pin (13) on inner brakeshoe (4).
3. Install eccentric pin (9) on outer brakeshoe (5) with new lockwasher (8) and nut (7).
4.
Install inner brakeshoe (4) and outer brakeshoe (5) on brake lever (1) with two new retaining
rings (6).
5. Install four washers (10), retaining clip (11), and two new slotted rings (12) on eccentric pin (9)
and mounting pin (13).
1. Install inner brakeshoe (4) and outer brakeshoe (5) on brakedrum (26) and transfer case cap (22)
with screw (25), washer (24), and nut (23). Tighten nut (23) to 153-196 lb-ft (207-266 Nm).
2.
Insert threaded end of brake cable (14) through eye of brake lever (1) and install adjusting nut (15)
to previously marked position. Tighten jamnut (16) against adjusting nut (15).
8-8