Chain Block Manual

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CHAIN HOIST INSPECTION & MANUALS OPERATION INSTRUCTIONS Before lifting inspect carefully the hooks, the load chain, the brake device and lubrication of the block. For safe operation you must keep six rules as following. 1. Don't lift load exceeding the rated capacity of the chain block. 2. Don't use the block chain as a sling. 3. Don't use when the chain is kinking. 4. To avoid accidents working or passing under a lifting load is strictly forbidden. 5. In case of the hand chain fails to move. Don't use undue force. Stop operation and process inspection of the chain block. 6. Only use to lift vertically, do not use to drag loads. MAINTENANCE 1. After operation, clean the chain block from dirt and keep it in a dry place from rust and corrosion. 2. Clean the chain block annually by purging the parts in kerosene and apply grease to them. It is advisable that the cleaning work should be done by skilled hands. 3. "O" marks on the two disk gears should be aligned. 4. Stick the rollers of both left and right bearings to the inner race of the bearings on the chain sprocket shaft journal, and then put then into the outer race of the bearings on the side plates. 5. After cleaning and repair the chain block should be subjected to non-load and heavy load tests. If it works normally put it into operation. 6. For convenience of maintenance and dismantling. One of the links of the hand chain is open. Lifting Load: Ensure area is clear of people and obstruction, and begin lifting by slowly pulling hand chain in "U" direction. Lowering Load: Ensure area is clear of people and obstructions, and reverse lifting procedure ( or lifting down by slowly pulling hand chain in “ D” direction ). It may be necessary to apply extra initial effort to release friction between brake components. Pre-use Inspection The operator shall perform a pre-use inspection, if any deficiencies are found the equipment will be taken out of service and the supervisor notified. 1. Visually inspect all load chains for gross damage that may be a hazard.

2. Hoist is properly secured. 3. The load does not exceed the load limit on the warning label. 4. Check that motions are smooth and regular with no hesitations, vibration, binding, unusual noise, or other irregularity. 5. Chain is not kinked or damaged. Annual Inspection The Annual inspection may be performed with the hoist in its normal location and do not require the hoist to be dismantled. Covers and other items normally supplied to allow inspection of components should be opened or removed for these inspections. Inspection Items 1. Operating mechanisms checked for maladjustment and listened to for unusual sounds that may indicate problems. 2. Tightness of bolts, nuts, and rivets. 3. Excessive wear, corrosion, cracks, or distorted parts in the following: • • • • • • • • • • • •

locking and clamping devices Damage or excessive wear on hook-retaining nuts or collars and pins and welds or rivets used to secure the retaining members. Excessive wear or damage on load sprockets, idler sprockets, hand chain wheel, and drums or sheaves shall be checked for damage or excessive wear. Hand chain-operated hoists checked for evidence of worn, glazed, or oil-contaminated friction disks; worn pawls, cams, or ratchets; and corroded, stretched, or broken pawl springs in braking mechanism. Evidence of damage to supporting structure or trolley. Presence of legible warning labels . End connections load chains shall be checked for evidence of wear, corrosion, cracks, damage, or distortion. Welded link hoist chain Hooks •

4. 5. 6. 7. 8. 9. 10. 11.

load blocks suspension housings hand chain wheels chain attachments clevises yokes suspension bolts shafts gears bearings pins rollers

Welded Chain Inspection 1. The hoist shall be tested under load in lifting and lowering directions and the operation of the chain and sprockets shall be observed. The chain should feed smoothly into and away from the sprockets. 2. If the chain binds, jumps, or is noisy, it shall first be checked to ensure that it is clean and properly lubricated. If the trouble persists, the chain and mating parts shall be inspected for wear, distortion, or other damage. 3. The chain shall be examined visually for gouges, nicks, weld spatter, corrosion, and distorted links. 4. The chain shall then be slackened and the adjacent links moved to one side to inspect for wear at the contact points. 5. The chain should be measured according to the hoist manufacturer's instructions. If instructions are not available, the process shall continue as follows. • •

An unworn, unstretched length of the chain shall be selected (e.g., at the slack end). The chain shall be suspended vertically under tension and, using a calliper-type gage, the outside length of any convenient number of links shall be measured (approximately 12 to 24 inches overall).

The same number of links in the used sections shall be measured and the percentage increase in length shall be calculated. Inspection •

1. 2. 3. 4. 5. 6.

Cracks, nicks, or gouges. Latch engagement, damaged or malfunctioning latch (if provided) . Hook attachment and securing means. Deformation. Any bending or twisting exceeding 10 degrees from the plane of the unbent hook. Throat Opening. Any distortion causing an increase in throat opening exceeding 15 percent. Wear. Any wear exceeding 10 percent of the original section dimension of the hook or its load pin.

Hook