Harrington Hoists and Cranes Series 3 End Truck - Manual (Page 40)

Table 5-3 Inspections Methods and Criteria
Crane
Component
Item Method Criteria Action
Crane
Electric
Parts
1. Power supply (For cable power supply system)
Guide (messenger)
wire tension Check visually. The wire must be sufficiently tight to
minimize sag. Tighten when necessary.
Cable hanger
installation and
mobility Check visually. The cable must be hung from cable
hangers at even intervals. The cable
must be hung from the cable hangers
so that it does not twist. Replace hangers when
necessary.
Cable length Check visually. The cable must be 10% longer than
the crane’s maximum travel distance. Replace cable with a
longer one when
necessary.
2. Ground protection Verify Non-Current
Carrying parts are
grounded. Non-Current Carrying Parts must be
grounded and must not exceed 100
Ohms resistance to ground. Ground parts to conform
with applicable standards
and regulations.
Travel surfaces must be kept clean
and free of insulating materials such
as paint, oil, or grease. Remove any insulating
materials.
3. Insulation Use Insulation
Resistance Meter
to check wiring
integrity. Insulation resistance must be 0.5 Meg
Ohms or more. Replace wires/cables that
have defective insulation.
Travel Rail/
Runway
4. Travel Rail / Runway
Looseness in fasteners Check tightness or
torque. Fasteners must be sufficiently tight. Tighten when necessary.
Oil, grease or paint on
traveling surfaces Check visually The traveling surfaces must be free of
oil, grease, or paint. Clean where necessary.
Rails/Runways
Dimensions Measure Dimensions to be in accordance with
CMAA criteria given in Table 2-1 of
this owner's manual. Adjust as necessary to
meet the criteria.
Girder
(Bridge
Beam)
5. Girder (Bridge Beam)
Bridge Beam Check visually and
measure. The beam must not be deformed or
damaged. Repair or replace parts as
necessary.
Welded parts Check visually and
use NDT if
necessary. Welds to be in accordance with CMAA
criteria. Repair as necessary.
Bridge Beam Check visually and
measure. The travel surface must not be worn
excessively. Replace.
Looseness in fasteners Check tightness or
torque. Fasteners must be sufficiently tight. Tighten where necessary.
Deflection Measure under a
rated load at mid
span Deflection must be within 1/600 or less
of the span. Repair or replace, or lower
the rated capacity.
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