MAINTENANCE
WARNING
•Never perform maintenance on hoist while it is supporting a load.
•Before performing maintenance, tag hoist:
WARNING - DO NOT OPERATE -
EQUIPMENT BEING REPAIRED.
•Only allow personnel trained in the operation and service of this product to perform maintenance.
•After performing any maintenance on hoist, test to 125% of its rated capacity before returning to service. Testing to 150% of rated capacity might be required to comply with standards and regulations set forth in areas outside of the USA.
Installing New Load Chain
Refer to Dwg. MHP0042 on page 9.
1.Ensure welds of “standing” links on new load chain are facing away from load sheave assembly (7).
2.Ensure load chain (55) is reeved between load sheave assembly (7) and chain guides (6) and (8).
3.Bottom hook assembly (50) must be on left fall of load chain (55) and right fall must have a chain stopper (54) attached to end link.
Load Chain | Load Sheave |
|
Standing Link
Chain Weld
(Dwg. MHP0042)
NOTICE
•Right and left designations are as viewed from hand lever side of hoist.
4.On 6 ton hoists feed load chain through bottom block assembly and secure to top hook bracket with capscrew (49) and nut (60). Ensure load chain is straight and not twisted. Chain weld on standing links will be to the inside of bottom hook idler sheave (56). Refer to Dwg. MHP0834 on page 9.
5.Lubricate new load chain before using hoist. Refer to “LUBRICATION” section for recommended lubricants.
General Disassembly
The following instructions provide necessary information to disassemble, inspect, repair and assemble hoist. Hoist assembly parts drawings are provided in “PARTS” section.
If a hoist is being completely disassembled for any reason, follow the order of the topics as they are presented. It is recommended that all maintenance work on hoist be performed on a bench in a clean dust free area.
In the process of disassembling the hoist, observe the following:
1.Never disassemble hoist any further than is necessary to accomplish needed repair. A good part can be damaged during the course of disassembly.
2.Never use excessive force when removing parts. Tapping gently around the perimeter of a cover or housing with a soft hammer, for example, is sufficient to break the seal.
3.Do not apply heat to a part to free it for removal, unless part being heated is already worn or damaged beyond repair and no additional damage will occur to other parts.
In general, hoist is designed to permit easy disassembly and assembly. Use of heat or excessive force should not be required.
4.Keep work area as clean as practical, to prevent dirt and other foreign matter from getting into bearings or other moving parts.
5.When grasping a part in a vise, always use
6.Do not remove any part which is press fit in or on a subassembly unless removal of that part is necessary for repairs or replacement.
6 ton Hoist
Attach chain |
|
|
end to hoist top | R | L |
|
| DA |
hook bracket | F | O |
E |
| |
| E |
|
Weld on standing links must be to outside of top load sheave and to inside of bottom hook idle sheave
(Dwg. MHP0834)
Hoist Disassembly
Refer to Dwg. MHP0773 on page 12.
Accessing Brake End
1.Remove retainer wire (30) and lift off cover (29).
2.Remove split pin (71) and castle nut (70) from drive shaft (3).
3.Remove screw (69) and washer (68).
4.Remove two screw (64) and washer (65) from lever handle assembly (25). Lift off lever handle assembly (25).
MHD56109 - Edition 9 | 9 |
