The union has disputed the company's figures, pointing to a record productivity rate for August of an average of 28.33 crane movements an hour, and says stevedores would have to work 32 weeks of double shifts to earn $91,000.
In its claims lodged yesterday before a return to mediated talks on Thursday - after the next strike - the union repeated its demand to regain the cargo shuttle jobs subject to interim arrangements it said it was prepared to discuss with the company.
But it also said it would agree to work with the port to investigate changes to improve productivity and rosters over what it suggested should be a six-month settlement period.
The company said it would need to study the union's claims in detail before being able to comment.
Auckland Mayor Len Brown has meanwhile responded to a list of questions posed in yesterday's Herald about his handling of the row.
Mr Brown, who has been holidaying on Waiheke, defended not being available for interviews since news of the port's loss of Fonterra export business broke on Wednesday.
"I think it's important to be clear though. As with any industrial dispute, this is not going to be resolved by people playing politics, nor ... by an ongoing debate in the media," he said in a written statement.
Mr Brown said the dispute was entering a "critical period", but he did not see the need to return to Auckland to bring the parties together immediately to settle it. "Both sides ... are very aware of what is at stake. "
He agreed that a functioning port was crucial to his goal of Auckland becoming the world's most liveable city.
"That is the challenge for the port company and the workforce. I believe they are up for that challenge."