User`s manual

38
SPECIAL USAGE MODES FOR YOYO HOISTS
Check once a week that:
• The hoisting brake works properly
• The clutch is efficient
• The limit switches’ (if any) functionality
• The push button control pendant and the relevant connections are not damaged
• The hoisting chain is efficient and lubricated
CHAIN
The hoist’s chain undergoes constant stress; it is important to be familiar with this member so as to avoid any trouble, consequently:
• If the hoist operates in aggressive or abrasive environments lubricate with dry molybdenum disulfide aerosol lubricant.
• Where avoiding dripping is mandatory, use silicone grease.
• The chain life is determined by the lubrication degree as well as by the intensity of service. Lubrication and check operations should
therefore be proportioned to the hours of service.
• The chain should be checked by visually verifying the degree of wear according to the nominal values shown in the table
• Replace the chains in the event even only one link has stretched or worn by over 5%.
• Replace the chain in the event a stretching of over 2% on a length of 11 links is detected.
Chain Type: RB 80
Pitch Width Working length Weld’s
diameter
d
s
max.
Nominal
dimension
d
n
Tolerance
on
material’s
diameter
P
n
tolerance
1)
Internal
w
3
min.
external
W
2
max.
11 x p
n
tolerance
1)
7 ±0.3 21 0.4 8.4 23.8 231 1.1 7.6
DIMENSIONS OF HOIST CHAIN AND
LINKS
1 link’s central cross line
L multiple length of the pitch
P pitch
Dn Chain diameter as measured
Ds welding diameter
E length affected by the weld
W1 inner width at welding point
W2 outer width above welding point
1