Boom Lock Mounting Studs May Fail Caterpillar

Boom Lock Mounting Studs May Fail

Usage:

TELESCOPIC MATERIAL HANDLERSRT50 (5PF, 4XG),
RT50 SA (8DJ),
RT60 (5DG),
RTC60 (5PF, 4XG),
TELESCOPIC MATERIAL HANDLERS

Problem:

There have been reports of the 838170 Boom Lock Group having a failure of one or both of the 838419 Studs that retain the 838424 Boom Stop into the No. 1 section of the boom.

A 838419 Stud failure will NOT cause the boom to accidentally fail if a hose ruptures, overcenter valve fails or a seal leaks. A stud failure could allow the boom stops to be dislodged and fall. If the 838419 Studs are damaged, the amchine should not be used until damage is repaired.

Solution:

If a boom stop needs to be repaired because of the 838419 Stud breaking, a 6mm x 20mm x 65mm steel plate can be welded in position as shown in the illustration. this plate will allow the studs to fload in the slotted holes without being sheared off.

NOTE: The boom lock is not intended to prevent the powering down of the boom. It is provided to prevent lowering of the boom if hydraulic pressure is lost.

COPYRIGHT 1994 CATERPILLAR ALL RIGHTS RESERVED

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