Maeda MC815C, Руководство по обслуживанию, Страница: 121 / 378

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5.2.2 INSPECTION OF HOOK BLOCK
Hook block is one of the important security parts. Inspect it by following the procedure below, and always use it in a
safe condition.
If any faulty point is found as a result of inspection, repair or replace it promptly.
For the replacement, altering inspection is required.
1. The surface of sheave grooves must be smooth so that the wire rope will not be damaged.
If any sharp edge is found, round it off by using a grinder or the like.
2. Check to ensure that the sheave can be turned smoothly.
If it is reluctant to turn, the wire rope will slip on the sheave grooves, and thus the wire rope may be damaged.
Inspect each sheave bearing, and if it does not turn smoothly, replace it.
3. Check each mounting bolt of the sheave to ensure that it is securely mounted without any damage.
If it is loosened, give it an additional tightening. If it is damaged, replace it.
4. Check the hook nuts to ensure that they are firmly mounted and that they are not damaged.
If it is loosened, give it an additional tightening. If any of the hook nuts is abraded or damaged, replace it.
5. Check the wire rope latch to ensure that it can function normally.
If it fails to function normally, repair or replace it.
6. Check for any crack on the hook by conducting a “magnetic crack detection test” at least once a year.
If any crack is detected, replace it promptly.
7. There are two “punched marks” on the hook. Measure the distance between the punched marks on the hook.
If the measurement results indicate that dimension a exceeds 122.4 mm or dimension b of the lower spot of the
hook has reached 70.8 mm or less, replace the hook.