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Repair
Actual repairs are limited to the removal of small burrs and other minor surface
imperfections from gears and shafts. Use a fine stone or emery cloth for this work.
Do not use steel wool.
1. Worn or damaged parts must be replaced. Refer to the applicable Product Parts
Information manual for specific replacement parts information.
2. Inspect all remaining parts for evidence of damage. Replace or repair any part
which is in questionable condition. The cost of the part is often minor in
comparison with the cost of redoing the job.
3. Smooth out all nicks, burrs, or galled spots on shafts, bores, pins, or bushings.
4. Examine all gear teeth carefully, and remove nicks or burrs.
5. Polish the edges of all shaft shoulders to remove small nicks which may have been
caused during handling.
6. Remove all nicks and burrs caused by lockwashers.
7. Replace all gaskets, oil seals, and ’O’ rings removed during hoist disassembly.
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Hoist Assembly
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Reduction Gear Assembly
1.5 ton Single and 3 ton Double Fall
Refer to Dwgs. MHP2650 and MHP2822.
1. Install exhaust washer (3) in reduction gear end cover (5) and secure with retainer
ring (2).
2. Lubricate and install 'O' ring (6) in reducer housing (23).
3. Assemble planetary gear assemblies. Install spacer (12), bearing rings (14) and
needle bearings (15) in three planetary gears (13). Install planetary gear
assemblies into planetary carrier (17). Ensure that planetary gears (13) are
installed with the smaller gear head diameter nearest the ring gear (19).
4. Align planetary gear assemblies with small holes in planetary carrier and install
planet axles (16). Flat surface of pin should be facing in toward inner diameter
of carrier to allow installation of bearing (18).
5. Time planet gears as shown in drawing MHP1406 on page 12,
A.
Planetary
Support;
B.
Timing Marks;
C.
Planet Gear. Use the pinion shaft (25) to maintain
timing position.
6. Install bearing (18) in gear carrier and tap into place.
7. Install bearing (11) on opposite side of gear carrier and secure with retainer ring
(9).
8. With pinion shaft (25) still in place, install planet support assembly in ring gear
(19) carefully remove pinion shaft without removing planet support assembly and
place ring gear flat on surface with planet support assembly facing up.
9. Align gears with housing (23) and install over planet support assembly and ring
gear.
10. Install pinion shaft through reduction gear housing assembly secure with retainer
ring (10).
11. Install stop ring (24) in gear housing (23).
12. Lubricate and install ‘O’ ring (6) and oil seal (20) on cover (27). Ensure oil seal
inner spring is facing hoist body.
13. Install cover (27) in reduction gear housing (23).
4 ton Single and 8 ton Double Fall
Refer to Dwg. MHP3003.
1. Lubricate and install ‘O’ rings (6) and (138) and bearing (137) in reduction gear
end cover (5).
2. Assemble planetary gear assemblies. Install spacer (141), needle bearings (142)
and (147), spacers (145) and (144) in three planetary gears (140). Install
planetary gear assemblies into planetary carrier (17). Ensure that planetary gears
(140) are installed with the smaller gear head diameter nearest the ring gear (19).
3. Install bearings (11) and retainer ring (14) on sun gear (153).
4. Time planet gears as shown in Dwg. MHP3048 on page 13,
A.
Aligned Teeth;
B.
Timing Mark;
C.
Offset Teeth and Timing Mark. Use the assembled sun gear
(153) to maintain timing position.
5. With sun gear (153) still in place, install planetary assembly in ring gear (19)
carefully place ring gear flat on surface with planet support assembly facing up.
6. Align gears with housing (23) and install over planet support assembly and ring
gear.
7. Install primary gear assembly (126) on planet housing (17).
8. Install pinion shaft (25) through reduction gear housing assembly so it locates
in the sun gear (152) of primary gear assembly (126).
9. Align capscrew holes and install reduction gear end cover (5) on ring gear (23).
10. Install bearing (132) on primary gear assembly (126) with three drops of Loctite
® 603 on external ring of bearing.
11. Install exhaust washer (3), ‘O’ ring (29), and dampeners (135) in muffler cover
(136) and secure with retainer ring (24).
12. Install ‘O’ ring (64) on muffler cover and thread muffler cover into reduction gear
end cover (5).
13. Install capscrews (4) and lockwashers (44) through reduction gear assembly parts.
Refer to “TORQUE CHART” on page 19 for torque requirements.
6 ton Quad Fall
Refer to Dwg. MHP2822.
1. Install exhaust washer (3) in reduction gear end cover (5) and secure with retainer
ring (2).
2. Lubricate and install ‘O’ ring (6) in reduction gear end cover (5).
3. Assemble planetary gear assembly. Install spacer (12), needle bearings (15), and
bearing rings (14) in three planetary gears (13). Install planetary gear assemblies
into planetary carrier (17). Ensure that planetary gears (13) are installed with the
smaller gear head diameter nearest the ring gear (19).
4. Align planetary gear assemblies with small holes in planetary carrier and install
planet axles (16). Flat surface of pin should be facing in toward inner diameter
of carrier to allow installation of bearing (18).
5. Time planet gears as shown in Dwg. MHP1406, on page 12,
A.
Planetary Support;
B.
Timing Marks;
C.
Planet Gear. Use the pinion shaft (25) to maintain timing
position.
6. Install bearing (18) in gear carrier and tap into place.
7. Install bearing (11) on opposite side of gear carrier and secure with retainer ring
(9).
8. With pinion shaft (25) still in place, install planet support assembly in ring gear
(19) carefully remove pinion shaft without removing planet support assembly and
place ring gear flat on surface with planet support assembly facing up.
9. Align planet gears with housing (23) and install over planet support assembly
and ring gear.
10. Install pinion shaft (25) through reduction gear housing assembly secure with
retainer ring (10).
11. Install stop ring (24) in gear housing (23).
12. Lubricate and install ‘O’ ring (6) and oil seal (20) on cover (27). Ensure oil seal
inner spring is facing hoist body.
13. Install cover (27) in reduction gear housing (23).
6 ton Single, 12 ton Double, 18 ton Triple and 25 ton Quad Fall
Refer to Dwgs. MHP3011 and MHP3014.
1. Lubricate and install ‘O’ rings (6) and (138) and bearing (137) in reduction gear
end cover (5).
2. Assemble planet support assembly (341). Install bearings (147), internal bearing
rings (141), needle bearings (142) and (144), spacers (146) and rings (148) in
four planetary gears (140). Install planetary gear assemblies into planetary carrier
(17). Ensure that planetary gears (140) are installed with the smaller gear head
diameter nearest the ring gear (19).
3. Align planetary gear assemblies with small holes in planetary carrier and install
planet axles (16).
4. Time planet gears as shown in Dwg. MHP3049, on page 13,
A.
Aligned Teeth;
B.
Timing Mark;
C.
Offset Teeth and Timing Mark. Use the sun gear (153) to
maintain timing position.
5. Install bearings (11) and retainer ring (14) on sun gear (153).
6. With sun gear (153) still in place, install planetary assembly in ring gear (19)
carefully remove sun gear (153) without removing planetary assembly and place
ring gear flat on surface with planetary assembly facing up.
7. Align gears with ring gear (23) and install over planetary assembly and ring gear.
8. Install assembled sun gear (152) in primary gear assembly (126).
9. Install assembled primary gear assembly (126) on planet housing (17).
10. Install bearing (132) on primary gear assembly (126) with three drops of Loctite
® 603 on external ring of bearing.
11. Install pinion shaft (25) through reduction gear housing assembly so it locates
in the sun gear of primary gear assembly.
12. Lubricate and install ‘O’ ring (6) in reduction gear end cover (5).
13. Align capscrew holes and install reduction gear end cover (5) on ring gear (23).
14. Install ‘O’ ring (64) on muffler cover and thread muffler cover into reduction gear
end cover (5).
15. Install exhaust washer (3), ‘O’ ring (29), and dampeners (135) in muffler cover
(136) and secure with retainer ring (24).
16. Install capscrews (4) and lockwashers (44) through reduction gear assembly parts.
1.5 ton Single Fall, 3 ton Double Fall and 6 ton Quad Fall
B
A
C
(Dwg. MHP1406)
12
Form MHD56279 Edition 4
