CHAIN
Inspect chain at least once a month. Between regular inspections, check visually daily for nicks, gouges, weld splatter, corrosion,
or distorted links. Inspect chain thoroughly if it does not feed smoothly over load sheaves. Inspect as follows:
1. Clean chain with solvent before inspection.
2. Test hoist with load and observe operation of chain over load sheaves.
3. Slacken chain and inspect contact points for excessive wear. Refer to Figure 3.
4. Using caliper-type gauge, measure inside length of 5 links under light tension. Refer to Figure 4. Replace chain if
measurement exceeds maximum allowable gauge length as follows:
CAPACITY
TONS
CHAIN WIRE
DIAMETER
5 LINKS
NORMAL
5 LINKS
MAXIMUM
1/2
5.0mm
75mm
77.6mm
1
6.3mm
95mm
98.3mm
2
8.0mm
120mm
124.1mm
1-1/2 and 3
7.1mm
105mm
108.6mm
5 and 10
9.0mm
135mm
139.6mm
INSTALLING LOAD CHAIN
WARNING: DO NOT ADD TO LOAD CHAIN; REPLACE ENTIRE CHAIN
To install load chain into load chain sprocket:
1. Position load chain sprocket by rotating handchain wheel so that wide and narrow grooves show.
2. Using a forked poker, insert top chain link into sprocket grooves so that chain will wind up and back over sprocket. Welds
must be away from sprocket.
3. Rotate handchain wheel so that load chain winds around sprocket. Stop when chain falls 6 to 8 inches at back of sprocket.
4. Attach end link of the load chain to the chain anchor.
To install load chain anchor when replacing old chain:
1. Remove cotter pin and chain anchor pin on chain anchor.
2. Insert bottom chain link into chain anchor.
3. Insert chain anchor pin through anchor brackets and chain link.
4. Insert cotter pin through hole in anchor pin and secure.
To install load chain into lower hook (1/2, 1, 1-1/2, and 2 ton):
1. Remove cotter pin from castle nut and remove nut.
2. Insert last chain link into lower hook slot. Check that chain is not twisted.
3. Insert chain bolt into lower hook slot.
4. Insert chain bolt through lower hook slot and chain link.
5. Secure castle nut to end of bolt.
6. Insert cotter pin into castle nut and secure.
To install load chain into lower hook (3, 5, and 10 ton):
1. After installing load chain into load chain sprocket, run remaining chain through hands, removing any twist. Last link of
chain must be in same direction as first. If not, cut off last link.
2. Insert last link into left-hand pulley of lower hook. Pull chain through and up from underside of pulley.
3. Check that chain stopper is on right-hand side.
4. Insert last link into right-hand pulley of upper hook, moving chain up, back, then down. Check that chain is not twisted and
welds face away from pulley.
5. Insert last link into right-hand pulley of lower hook, pulling up from underside of pulley. Check that chain is not twisted.
6. Insert last link over left-hand pulley of upper hook, moving chain up, back, then down.
7. To prevent free-wheeling of chain, insert screwdriver securely into link at base of upper pulley.
8. Remove cotter pin, castle nut, and chain bolt in lower hook slot.
9. Insert last link into slot.
10. Check that chain is not twisted.
11. Position bolt back through lower hook slot and last chain link.
12. Place castle nut onto end of bolt.
13. Secure cotter pin in tapered hole of bolt.
14. Remove screwdriver from link at base of upper pulley.
Install load chain for 3 ton and 5 ton hoists in same manner as above but allow for fewer falls of chain.
5
Содержание L90
Страница 7: ...6 ...
