8.Install hand chain (46) in handwheel (31). Make sure hand chain (46) is seated properly.
9.Install “looped” end of a hand chain guide (35) over each of the two upper stay bolts on side plate 1 (1). Hand chain guides (35) must be positioned like two “Ls” pointing inward (“[_ _]”).
10.Place wheel cover (38) over stay bolts. Free ends of chain guides (35) go on outside of wheel cover (38).
11.Install
Gears (14)
On
(Dwg. MHP0044)
Note: The 1/2 ton hoist has a center pinion gear with only five teeth.
Hand Chain Adjustment or Replacement
•When cutting weld side of a hand chain link, do not cut or nick opposite side. A damaged link must be replaced to prevent premature failure. A falling hand chain can cause injury.
(Dwg. MHP0016)
1.To create a “C” link, cut welded side of link with a hacksaw. Clamp one side of “C” link in a vise and bend it open by using a pliers to grip the exposed part of link. Refer to Dwgs. MHP0014 and MHP0016 on page 12.
(Dwg. MHP0014)
2.If you are replacing the hand chain, disconnect it at the “C” link and carefully remove the hand chain.
3.When replacing a hand chain, cut a length 2 times the required hand chain drop plus about one foot (305 mm). For adjustments, remove or add a length of chain twice the difference in hand chain height. To prevent hand chain from twisting, maintain an even number of links, by removing or adding an even number of links.
4.If you are replacing hand chain, run new hand chain up through left hand chain guide, around handwheel, making sure hand chain is seated in handwheel pockets, and back down through right hand chain guide.
5.Connect hand chain ends with ‘C’ link(s), making total number of links even, and bend ‘C’ link(s) shut.
6.Make sure hand chain is not twisted. If twisted, untwist or open a ‘C’ link and remove one hand chain link if necessary.
Overload Clutch Assembly
1.Install supporter (78) on pinion shaft (13). Set cone wheel (79) in handwheel (31). Install spring (94) and ball (93) in hole in handwheel. Position parts on supporter (78) making sure ball and spring remain in place. Notch in supporter must line up with ball and spring hole.
2.Install cone spring (80) with dished surface towards brake discs (27) and (28).
3.Install washer (81) on hub of supporter (78) so tab locates in supporter slot. Outer tabs on washer (81) must face outward away from cone spring (80).
4.Install nut (82) on supporter (78) until finger tight.
5.Install washer (32) and nut (33) on pinion shaft (13).
6.Adjust overload clutch as described in the “Overload Clutch Adjustment” section.
Load Test
Prior to initial use, all new, extensively repaired, or altered hoists shall be load tested by or under the direction of a person trained in operation and maintenance of this hoist, and a written report furnished confirming rating of hoist. Test hoist to 125% of rated hoist capacity. Testing to more than 125% is required to test overload clutch and may be necessary to comply with standards and regulations set forth in areas outside of the USA.
12 | MHD56012 - Edition 8 |