NOTICE
• It is not necessary to remove check valve (77) unless replacing ball (47) and
‘O’ rings (53).
• It is not necessary to remove pendant adapter plate (605) or (613), or rope
control block (313) or (405), unless valve assemblies (86) and (87) require
replacement.
4. Remove and discard gasket (91).
5. Remove check valve (77), ‘O’ rings (53) and ball (47).
6. Remove capscrews (90) and remove motor cover (83) from motor cover (222).
7. Remove and discard ’O’ rings (70).
8. Remove idle gear (79) and drive gear (154).
9. Remove exhaust washer (81) from motor cover (83).
10. Remove valve assemblies (86) and (87) and spring assembly (221) from motor
cover (83).
11. Remove motor casing (222) from motor housing (76).
12. Loosen setscrews (156) to remove exhaust pipes (60) and ‘O’ rings (45).
NOTICE
• Two bearings (78) in motor housing are bonded with Loctite® 603 or
equivalent. Remove idle gear (79) and drive gear (80) only if replacement
is necessary, use a bearing punch (IR pn: 96441232) or a standard drift
punch and a hammer. Refer to Dwg. MHP2644 on page 15.
13. Remove bearings (78) from drive gear (80) and idle gear (79) only if replacement
is necessary (use a suitable bearing extractor).
14. It is necessary to remove plug (1) and washer (151) from housing (76) this will
release the brake housing (61).
n
Emergency Stop and Overload Adapter Disassembly
Refer to Dwgs. MHP3037 and MHP3038.
1. Remove ‘O’ rings (70) and discard.
2. Remove setscrew (180) from emergency stop end cover (183).
3. Remove capscrews (103).
4. Remove emergency stop end cover (183) and gasket (91).
5. Remove ball (47).
6. Remove valve seat (186).
7. Remove seal (189) and axle (188) and ‘O’ rings (187) from valve seat (186).
8. Remove spring (193).
9. Unscrew tightening setscrew (102).
10. Unscrew regulating screw (192). Remove ‘O’ ring (191) and discard.
11. Remove valve seat (205).
12. Remove spring (213) from cap (202).
13. Remove capscrew (62).
14. Remove caps (202) and (211), washers (208) and (206), spacer tube (209) and
diaphragm (212).
15. Remove seals (203) and (210).
16. Pull plunger (198) with diaphragm (196) and nut (194) from base plate (199).
17. Unscrew nut (194) and remove plunger (198), diaphragm (196) and washer (195).
18. Remove ‘O’ rings (204) and discard.
19. Install a screw (dia. M5) in threaded hole on base plate (199) and pull it from
motor cover (83).
20. Remove seal (189) and ‘O’ ring (201).
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Disc Brake Disassembly
1.5 ton Single, 3 ton Double and 6 ton Quad Fall
Refer to Dwg. MHP2650 and MHP2822.
1. Remove plug (1) and washer (151).
2. Remove capscrews that secure brake housing (61) to motor housing.
3. Remove and discard gasket (7) and ‘O’ ring (6).
NOTICE
• Before removing the drive and friction plates make note of stacking order
for reassembly. Refer to Dwg. MHP2638 on page 6.
4. Remove reaction plate (68), splined hub (65) and piston (63) from brake housing
(61). It may be necessary to apply a small amount of low pressure air to release
piston (63) and brake reaction plate (68).
5. Remove friction plates (72), (66) and drive plates (67) from housing (61).
6. Remove and discard ‘O’ rings (6) and (64) from piston (63).
7. Remove and discard ‘O’ ring (157) and gasket (7) from hoist body side of brake
housing.
4 ton and 6 ton Single, 8 ton and 12 ton Double, 18 ton Triple and 25 ton Quad
Fall
Refer to Dwg. MHP2999, MHP3003 and MHP3038.
1. Remove plug (1) and washer (151).
2. Remove capscrews (62) that secure brake housing (61) to motor housing (76).
3. Remove brake housing (61) from motor housing (76).
4. Remove and discard gasket (7) and ‘O’ ring (6).
NOTICE
• Before removing the drive and friction plates make note of stacking order
for reassembly.
5. Remove reaction plate (68), splined hub (65) and piston (63) from housing. It
may be necessary to apply a small amount of low pressure air to release piston
(63) and brake reaction plate (68).
6. Remove friction plates (66), (72) and drive plates (67) from housing.
7. Remove and discard ‘O’ rings (6) and (64) from piston (63).
n
Reduction Gear Disassembly
1.5 ton Single and 3 ton Double
Refer to Dwg. MHP2650.
1. Motor, disc brake assembly and retainer ring (10) must be removed from pinion
shaft (25) before reduction gear assembly can be removed from hoist body.
2. Remove fill plug (1) from reduction gear end cover (5) and drain oil from reduction
gear into a suitable container.
3. Remove capscrews (4) that secure reduction gear assembly to hoist body (36).
4. Remove reduction gear end cover (5) from reducer housing (23).
5. Remove retainer ring (2) and exhaust washer (3) from reduction gear end cover
(5).
6. Remove and discard ‘O’ ring (6) and gasket (7).
7. Remove retainer ring (10) from pinion shaft (25).
8. Turn reduction gear over so that stop ring (24) is facing up.
9. Remove reduction gear assembly and reducer housing (23) with ring gear (19)
from hoist body (36).
NOTICE
• It is not necessary to disassembly planet support assembly (341), unless
replacing parts.
10. Tap pinion shaft (25) from planetary gear carrier (17).
11. Remove cover (27), ‘O’ ring (6), stop ring (24) and ring gear (19) from reducer
housing (23).
12. Remove and discard oil seal (20) from cover (27).
13. Remove planet support assembly (341) from ring gear (19).
14. Remove bearing (18) from gear carrier (17).
15. Remove retainer ring (10) and bearing (11) from planetary carrier (17).
16. Tap out planet axles (16) and remove planet gears (13), bearing rings (14), needle
bearings (15) and spacers (12).
4 ton and 6 ton Single, 8 ton and 12 ton Double, 18 ton Triple and 25 ton Quad
Fall
Refer to Dwgs. MHP3003 and MHP3011.
1. Motor, disc brake assembly, 'O' rings (40), spacer (97) and retainer ring (10) must
be removed from pinion shaft (25) before reduction gear assembly can be removed
from hoist body.
2. Remove drain plug (143) and drain oil from reduction gear into a suitable
container.
3. Remove capscrews (4) and lockwashers (44) that secure reduction gear assembly
to hoist body (36).
4. Remove reduction gear end cover (5) and ‘O’ ring (6) from ring gear (23).
5. Remove ‘O’ ring (138) and bearings (132) and (137).
6. Turn reduction gear end cover over so that retainer ring (24) is facing up.
7. Remove stop ring (24), dampeners (135), ‘O’ ring (29), and exhaust washer (3)
from muffler cover (136).
8. Unscrew muffler cover (136) from reduction gear end cover (5) and remove ‘O’
ring (64).
9. Remove primary gear assembly (126) and sun gear (152).
10. Remove ring gear (23), planet support assembly (341), sun gear (153) and ring
gear (19).
11. Remove retainer ring (14) and bearing (11).
12. Remove pinion shaft (25) from planet support assembly (341).
13. Remove bearing (11) from gear carrier (17).
NOTICE
• It is not necessary to disassembly planet support assembly (341), unless
replacing parts.
a. 4 and 8 ton Hoists:
Tap out planet axles (16) and remove planet gears (140), needle bearings
(142), (147) and spacers (141), (144) and (145).
b. 6 and 12 ton Hoists:
Tap out planet axles (16) and remove planet gears (140), needle bearings
(142) and (144), bearing rings (141), spacers (146) and (147) and ring (148).
14. Remove reducer housing (22) from hoist body (36).
15. Remove and discard ‘O’ rings (6).
6 ton Quad Fall Hoist
Refer to Dwg. MHP2822.
CAUTION
• It is not necessary to remove components from chain guide housing (58).
Adequately support hoist before separating.
1. Remove capscrew (41) and lockwasher (44) that secure chain guide housing (58)
to hoist body (36).
2. Remove fill plug (1) from reduction gear end cover (5) and drain oil from reduction
gear into a suitable container.
3. Remove retainer ring (10) from shaft (25) at brake end.
4. Remove capscrews (4) that secure reduction gear assembly to hoist body (36).
5. Remove reduction gear end cover (5) from reducer housing (23).
6. Remove retainer ring (2) and exhaust washer (3) from reduction gear end cover
(5).
7. Remove and discard ‘O’ ring (6) and gasket (7).
8. Remove retainer rings (9) and (10) and bearing (11) from pinion shaft (25).
9. Turn reduction gear over so that stop ring (24) is facing up.
10. Remove planet support assembly (341) and reducer housing (23) with ring gear
(19) from hoist body (36).
NOTICE
• It is not necessary to disassembly planet support assembly (341), unless
replacing parts.
11. Tap pinion shaft (25) from planet support assembly (341).
12. Remove cover (27), ‘O’ ring (6), stop ring (24) and ring gear (19) from reducer
housing (23).
13. Remove and discard oil seal (20) from cover (27).
10
Form MHD56279 Edition 4
