OZ Lifting Products OZ1000EC, Руководство оператора

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EN pg.9
MAINTENANCE:
A. CHAIN INSPECTION:
1.
First clean chain with a non-caustic/non-acid type solvent and make a link by link inspection for
nicks, gouges, twisted links, weld splatter, corrosion pits, striations (minute parallel lines), cracks in
weld areas, wear and stretching. A chain with any of these defects must be replaced before use.
2. When checking the chain for wear, check the part of the chain that goes through the lift wheel
of the hoist most often. Check the interlink area of the chain links for the point of maximum wear.
Measure and record the stock diameter at this point of the link. Then measure stock diameter in the
same area on a link that does not pass through the lift wheel. Compare these two measurements.
If the stock diameter of the worn link is 0.010 inches or more, than the stock diameter of the
unworn link, the chain must be replaced.
3. Check the chain for stretch with a vernier caliper. Select an unused, unstretched section of
chain then measure and record the length. Measure and record the same length on a worn section
of chain. Obtain the amount of stretch and wear by subtracting the measurement of the unworn
section from the worn section. If the result is greater than 0.145 inch, the chain must be replaced.
4. Use only a ‘Knife-edge’ caliper to eliminate the possibility of false reading by not measuring full
pitch length.
5.
These chains are specially heat treated and hardened, they should never be repaired.
IMPORTANT: Do not use replaced chain for other purposes such as lifting or pulling. Load chain may
break suddenly without visual deformation. For this reason, cut replaced chain into short lengths to
prevent use after disposal.
NOTE: A worn chain can be an indication of worn hoist components. For this reason, the hoist’s
chain guide, hook block and lift wheel should be examined for wear and replaced as necessary when
replacing worn chain.
Use of commercial or other manufactures’ chain and parts to repair OZ Electric Chain
Hoists may cause load loss. To avoid injury: Use only factory supplied replacement load
chain and parts. Chain and parts may look alike, but factory original chain and parts are
made of specific materials or processed to achieve specific properties.
A. CUTTING THE CHAIN:
The load chain is hardened and is difficult to cut. The following methods are recommended when cutting
a length of new chain from stock or cutting off worn chain. (Always wear eye protection when cutting the
load chain.)
1. Use a 7” minimum diameter by 1/8” thick abrasive wheel (or type recommended by your wheel
supplier) that will clear the adjacent links.
2. Use a grinder and nick the link on both sides, then secure the link with a vise and break off the
chain link with a hammer.
Cutting chain can produce flying particles.
To avoid health problems:
- Wear eye protection.
- Place shield over chain to prevent flying objects.
WARNING
WARNING