R&M Materials Handling, Inc
STAGEMAKER® COMPACT Concert Hoist
Springfield, Ohio USA
SM5 Manual
: 800 955-9967
Revision 1
web:
www.rmhoist.com
08/14/02
RM-SM5-MAN-2001-1-ENG
4-6
Load Chain Replacement
Chain Specification:
Load chain
Chain type:
Standard
Diameter (d) x Pitch (t):
0.189 x 0.492” (4.8 x 12.5 mm)
Class:
DAT
Grade:
H8S or HE G80 RAS
Maximum working stress:
19,652 lbs/in
2
(135.5 N/mm
2
)
Hardened surface:
580 or 700 HV (Vickers Hardness)
Thickness:
0.0039” (0.1 mm) to 0.0079” (0.2 mm)
Standard:
DIN 5684 - 8
Marking (10 x t):
1 or 16
H 8 S or A 8
Maximum working load, 1 fall:
1100 lbs. (500 kg)
Breaking load:
6519.50 lb
f
s (29 kN)
Maximum breaking stress:
116,030 lbs/in
2
(800 N/mm
2
)
Total breaking elongation:
>10% min.
Unit Weight: lb/ft [kg/m]
0.363 lbs./ft [0.54 kg/m]
Figure 4-4
Measuring the load chain for wear
Measuring the load chain for wear should be performed at several points.
G
Measure the diameter (d) and the pitch (t) of several links.
G
Measure the chain length over 11 links (11 t).
Load Chain Wear Limits:
Minimum link thickness allowed (d):
0.1693” (4.30 mm)
Maximum pitch allowed (t):
0.5157” (13.10 mm)
Maximum length allowed (11 t):
5.5216” (140.25 mm)
If any one of these load chain wear limits is exceeded, the
load
chain must be replaced
immediately
. If a single load chain link is defective in any way, the
whole chain must be
replaced
. In addition, the chain guide and the chain sprocket must be checked for excessive
wear. If necessary, replace the chain guide and the chain sprocket. A worn chain sprocket or
chain guide usually leads to premature chain wear.