MHD56114 - Edition 4
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3.
Pull the crankshaft valve end (231) off the crankshaft.
4.
Remove connecting rod rings (234), connecting rod bushing
(233), sleeve (232) and connecting rods (206). Record the
five connecting rod (206) numbers and foot directions so
they can be re-installed in the same order.
5.
Oil slinger (230) does not have to be removed unless
damaged. If removal is required, heating of the five screws
(229) may be necessary to loosen the Loctite
®
connection.
Disc Brake Disassembly
Refer to Dwg. MHP0630 on page 44.
NOTICE
• Prior to disassembly, matchmark the cover (2), housing (6)
and support plate (19) to assist in proper alignment of parts
during reassembly.
1.
Remove brake shaft (25) and retainer ring (23). Place brake
assembly on a flat surface with cover (2) on top. Remove
elbow fitting (80) and exhaust valve (79). Alternately and
evenly loosen the two capscrews (24) until the brake spring
(17) compression has been relaxed. Remove capscrews.
2.
Remove cover (2) and diaphragm (3).
3.
Using a small tipped screwdriver or similar tool, remove ring
(4). Remove diaphragm support (5).
4.
Remove housing (6) by lifting straight away from brake
parts. Collect the three dowel pins (9) and store until
reinstallation. Inspect pins for deformation, wear and
damage. Replace if parts fail inspection.
5.
Alternately remove the six separator plates (14) and five
friction plates (13).
6.
Remove the pressure plate (15) and springs (17).
7.
Grasp the outer race (12) and remove the sprag clutch as an
assembly. Remove the spacer (11) between the sprag clutch
assembly and support plate (19).
8.
Remove gasket (18) from support plate (19). Discard gasket.
9.
To remove the bearing (21) from the support plate (19) first
remove the retainer ring (22) and then press the bearing out
of the support plate recess.
NOTICE
• To prevent accidental damage, remove the bearing (21) only
if it requires replacement.
10. Separate the sprag clutch assembly into its component parts.
The sprag clutch assembly consists of the inner race (10), two
spacers (11), the outer race (12) and the sprag clutch (16).
The sprag clutch can be further disassembled into two
wearing plates and the sprag cage.
Automatic Drum Band Brake Disassembly
Optional feature. Refer to Dwg. MHP2508 on page 46.
1.
Loosen jam nut (117) closest to plunger (114). Turn
capscrew (120) counterclockwise until disconnected from
plunger.
2.
Disconnect air line from brake cylinder (121). With the aid
of a strap wrench, remove brake cylinder (121) and
components as an assembly by turning brake cylinder
counterclockwise until disconnected from brake bracket
(106).
3.
Disconnect brake bracket (106) from band assembly by
removing three capscrews (101), spacers (102) and spacer
tubes (103). Remove spacer plate (105).
4.
Disconnect brake bracket from motor end upright (68) by
removing two capscrews (107) and two capscrews (112).
DANGER
•
• Springs (124) and (127) exert a considerable force on cover
(125). Extreme care must be taken when disassembling the
cylinder assembly and removing cover (125).
5.
To disassemble the cylinder (121) assembly into its
component parts conduct the following:
a.
Use a press to compress the cover (125) enough to
remove retainer ring (126). Slowly, and carefully, relax
the load exerted on cover (125) by the springs (124) and
(127). Remove cover and springs.
b.
Remove washer (128).
c.
Remove piston (123) assembly.
d.
Disassemble piston assembly into component parts by
removing retainer ring (111) and separating cylinder rod
(108) from piston (123). Remove ‘O’ rings (122), (109)
and (110). Discard ‘O’ rings.
6.
Remove plunger (114) assembly and spring (113) from brake
bracket (106).
Manual Drum Band Brake Disassembly
Optional feature. Refer to Dwg. MHP1402 on page 47.
The winch does not have to be removed or disassembled to
disassemble the manual band brake.
CAUTION
• Release wire rope tension on the drum and disconnect main
air supply line.
1.
Raise handle (135) to free brake bands (136) and (137).
2.
Remove cotter pin (139) and pin (138).
3.
Rotate brake link stud (141) counter-clockwise until free
from brake handle.
4.
Remove grip from brake handle (135). Loosen screws in
brake handle until handle can be freed from brake band
bracket, remove brake handle. Remove pivot nut (134).
5.
Remove cotter pin (144) and washer (142).
6.
Loosen capscrews (133).
7.
Spread brake band (137) apart slightly and slide out over
drum flange. Rotate brake band around drum and remove.
8.
Repeat this procedure for brake band (136).
9.
Remove capscrews (133), washers (131), and adapter plate
(145).
10. Press bushings (143) out of brake band pivot brackets
.
Reduction Gear Disassembly
NOTICE
• It is not recommended to disassemble reduction gear.
Refer to Dwg. MHP0950 on page 40.
1.
Place the reduction gear assembly on a clean work bench
such that reducer housing (48) with oil seal (58) is down.
2.
Remove capscrews (33) and cover (34) from housing (38).
