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5-2. INSPECT LOWER BLOCK.
a. Check lubrication of all parts. Also lubricate the shank of
the hook which passes through the crosshead. If thrust
bearing is removed, apply NLGI No. 2 grease.
b. Check each sheave to insure rope groove is smooth and
free from burrs, or other surface defects.
c. Check each sheave for freedom of rotation, replace
bearings if defective.
d. Make certain that dowel pin holding the hook nut to the
hook, is securely in position.
e. If hook is equipped with a safety latch or rotational lock,
check to determine that they are in good operating
condition.
f. Check throat opening of hook. (Refer to Figure 5-1.) It is
recommended that upon receipt of the hoist, a
measurement be made and recorded of the hook throat
opening. OSHA regulations require that the hook be
replaced if the throat opening exceeds 15 percent of the
original opening, or if the hook is twisted more than 10
degrees from the unbent plane. A gage block, properly
identified to the hoist, similar to the one shown in Figure
5-1 is suggested to be made for each hook for use in
these measurements.
g. Hooks showing signs of cracks must be replaced. Hooks
should be inspected at least once per year using dye
penetrants, magnetic particle or other suitable crack
detecting methods.
h. Check wear of the hook, especially at the saddle and
replace if badly worn.
5-3. INSPECT UPPER BLOCK AND HOIST SUSPENSION.
a. Check upper block sheaves (when hoist is so equipped)
for wear, damage and freedom of rotation.
If sheaves do not rotate freely, disassemble block and inspect
bearings. Replace worn or damaged bearings, washers, pins
or sheaves.
b. Make certain that all sheaves, bearings and hanger pins
are free of foreign material and properly lubricated.
Bearings without grease fittings are lubricated for the life
of the bearing and require no further lubrication. After
inspection lubricate all upper block lubrication fittings.
c. Make certain that rope guide is not bent, loose or
otherwise distorted; guide must have close clearance to
sheave flange to keep rope in sheave grooves.
d. Check hoist suspension bolts on lug suspended hoists;
make certain that bolts are secure, properly tightened
and free from damage.
e. Check hoist suspension bolts on trolley mounted hoists.
Make certain that bolts are secure, properly tightened
and free from damage. On low headroom hoists, and
other two trolley hoists, suspension bolts to both trolleys
must be inspected.
Do not operate hoists having worn or damaged
suspension bolts.
WARNING
Figure 5-1. Method of measuring hook throat opening
12172
RECOMMENDED INSPECTION AND MAINTENANCE SCHEDULE
TIME INTERVAL
INSPECTION OR MAINTENANCE
Daily or start
*
Check operation of all functional mechanisms including limit switch operation, brakes and control. Check hoist cable
of each shift
for kinks, abrasions, corrosion or broken wires or evidence of improper spooling on drum. Inspect hooks, upper and
(visual)
lower blocks, and all load bearing components for damage.
1 Month
*
HOIST CABLE - Inspect and lubricate per Paragraph 5-8.
1-3 Months
*
ELECTRICAL CONTROLS - Inspect per Paragraph 5-4. Check hoist gearcase oil level - add oil as required per
Paragraph 4-2.d.
6 Months
*
LOWER BLOCK - Inspect per Paragraph 5-2.
UPPER BLOCK - Inspect per Paragraph 5-3.
Annually
*
Motor brake and actuating mechanisms. Inspect and adjust per Paragraph 5-5. Inspect hooks with crack detecting
procedures per Paragraph 5-2. Drain and refill hoist gearcase per Paragraph 4-2.
6 Months or
*
Inspect electrical controls per Paragraph 5-4. Change hoist gearcase oil - Fill with oil per Paragraph 4-2.d. Lubricate
500-750 hours
hoist cable per Paragraph 4-3. Lubricate upper and lower hook block per Paragraph 4-4. Lubricate limit stop lever
“on” time
per Paragraph 4-5. If a screw type limit switch is furnished, add a light film of NLGI No. 2 grease to bevel gear.
5 Years elapsed
*
Complete inspection, disassembly, and maintenance required. It is recommended that your SHAW-BOX Repair
time or 5000
Station be contacted for this service.
hours “on” time
Summary of Contents for SHAW-BOX
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