Bolton hospital cleaners, catering staff and porters have begun a two day walkout this morning.
Last week UNISON members rejected a new pay offer from a wholly-owned subsidiary of their NHS trust called Bolton iFM.
Staff want their pay increased inline with other hospitals where people who do the same job are set to be paid more.
UNISON North West regional organiser Tim Ellis said: “Staff spoke very clearly and determinedly about how they want the dignity of common treatment. Staff perform important roles in the hospital, and there should be NHS pay rates for all NHS staff.
“Bolton iFM’s latest offer shows that it has the resources to pay close to the NHS rate in the short term. It would be easy for the company now to pay staff the proper rate and commit to its workforce in future.
“Bolton’s hospital workers are only asking for the same that has been agreed nationally for staff doing the same jobs. Managers should do what they have previously committed to do, and pay staff what they are due.