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MITARI MDT Serie Manual De Instrucciones página 26

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6.
Maintenance
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 a 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.
Caution
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.
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 a worn chain.
Use of commercial or other manufacturers' chain and parts to repair CH 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.
Cutting chain can produce flying particles. To avoid health problems:
- Wear eye protection.
- Place shield over chain to prevent flying objects.
Lubrication
1.
Load Chain: The full length of the chain must be lubricated, including where the chain passes over
the chain wheel(s). Ensure that the contact points between the links (I.E. the chain saddles) are
adequately lubricated. A small amount of lubrication will greatly increase the life of the load chain.
DO NOT allow the chain to run dry. Keep the chain clean and lubricate the chain at regular intervals
with Lubriplate Bar and Chain Oil 10-R or equal lubricant. Normally, weekly lubrication and cleaning
are satisfactory, but under hot and dirty conditions, it may be necessary to clean the chain at least
once daily and lubricate the chain several times between cleanings. When lubricating the chain,
apply sufficient lubricant to obtain natural run-off and full coverage, especially in the interlink area.
Used motor oils contain known carcinogenic materials.
To avoid health problems: Never use used motor oils as a chain lubricant. Only use Lubriplate Bar
and Chain Oil 10-R as a lubricant for the load chain.
2.
2. Gearbox: For an ambient temperature of approx., 50 F to 122 F, a gear oil of Mm /S at 104 F, with
mild high-pressure additives should be used. Examples of oil types that can be used are:
Din 51502 Clp 220
E.G. Bp Energol Gr-Xp 20
Esso Spartan Ep 220
Shell Omala Vet 220
Mobil gear 630
Arai Degol Bg 220
Important: The bottom block must not touch the floor; if necessary adjust the
position of the chain stop on the slack end of the chain.
50
The lubricants used for the CH Mechanics Hoist may contain hazardous materials that mandate specific
handling and disposal procedures. To avoid contact and contamination: Handle and dispose of lubricants
only as directed inapplicable material safety data sheets and in accordance with applicable local, state
and federal regulations.
Testing
Before using, all altered, repaired or used hoists that have not been operated for the
previous 12 months must be tested by the user for proper operation.
1.
Test the unit without a load and then test the unit with a light load of 50 pounds (23 kg) times the
number of load chain supporting parts to be sure that the hoist operates properly and that the brake
holds the load when control is released.
2.
Next test with a load of 125% of the rated capacity. In addition, hoists in which load sustaining parts
have been replaced, you should test the load with 125% of rated capacity by or under an appointed
person and a written report prepared for record purposes.
3.
In accordance with the CMAA 78, it is required to have a 100% load test performed every four years.
The hoist must only be inspected and maintained by qualified, competent and trained staff.
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