VALVE GP 6E3725 - Caterpillar

Never lift objects with the boom transport lock ingaged. Severe machine damage can result if the boom transport lock is engaged while lifting objects.
Boom Lock
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Close the bucket and completely move in the stick. Slowly move the boom upward until the boom is completely inward.
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Move the boom lock lever toward the rear of the machine to the lock position.
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Make sure that the hook engages over the lock in order to secure the boom into the LOCK position. Activate the boom downward in order to force the boom against the boom transport lock. This will improve the ride of the machine.Boom Release
Slowly move the boom upward until the boom is completely inward.
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Pull the boom lock lever toward the front of the machine in order to disengage the boom lock. This will allow movement of the backhoe for operation.