OSHA Hazard Information Bulletins
Lorain Hydraulic Rough Terrain Cranes.
 OSHA Safety and Health Information Bulletins - Table of Contents
- Information Date: 19851108
- Record Type: Hazard Information Bulletin
- Subject: Lorain Hydraulic Rough Terrain Cranes.
November 8, 1985
MEMORANDUM FOR REGIONAL ADMINISTRATORS
| THRU: | JOHN B. MILES
Director
Directorate of Field Operations |
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| FROM: | STEPHEN J. MALLINGER
Acting Director
Directorate of Technical Support |
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| SUBJECT: | Lorain Hydraulic Rough Terrain Cranes
|
The Division of Occupational Safety and Health, State of California, has
investigated two accidents involving the failure of the boom on Lorain
Hydraulic Rough Terrain Cranes, Models LRT 275 and 1600M. Cracks were found
at the boom butt section welds at the connection to the horizontal pivot tube
in both accidents.
Koehring Cranes and Excavators, the manufacturer of the cranes, has
acknowledged the possible presence of the defect in the above models. The
manufacturer's representatives also indicated that other models with three
sections, 81 foot long booms may have defective pivot tube connections.
Koehring Cranes and Excavators has issued notices dated March 11 and 26 to
its distributors and customers on this issue. The notices warn against the
use of cranes with cracks in the boom pivot tube areas, and recommend a
method for a visual inspection. In addition, the manufacturer has supplied
the distributors and the users with instructions and parts for adding
reinforcement plates to both sides of the boom at the boom pivot tube area. A
list of crane models which require the recommended reinforcement is noted on
the March 29, 1985 notice.
The boom pivot tube area referred to in this memorandum is the area where
the bottom boom section is pivotally mounted on the revolving superstructure
by means of a tube and an internal bar. The welds in which the failure was
observed is that which connect the pivot tube to the boom. The manufacturer's
report on the foot boom analysis indicates that the recommendations for the
reinforcement method of the butt section is substantiated by a stress
evaluation under the most severe loading conditions, and that it should
result in preventing a boom failure due to weld fatigue.
Copies of the Koehring Cranes and Excavators' inspection notices, and of the
boom foot reinforcement kit instructions are attached for dissemination to
Area Offices, State Plan States, and Consultation Projects. It is likely
that many of these cranes have been inspected and repaired as recommended by
Koehring Cranes and Excavators. Nevertheless, some of the cranes may still
be in use without the proper repair. Therefore, compliance and consultation
personnel should be aware of the potential failure of the boom on the
unrepaired Lorain and Bantam cranes.
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