The third round of industrial action at Culture and Sport Glasgow has been planned for tomorrow and Monday.
This could shut the much-visited Burrell collection, Scotland Street museum and the museum resource centre in Darnley as well as other popular city centre attractions.
The two-day strike has been organised by four unions(Bectu, Unite, Unison and GMB) representing employees at CSG —
Union bosses say 200 staff will lose cash as a result of cuts in hours at some sports centres and are demanding a one per cent pay rise.
Paul McManus, Scottish organiser for BECTU said: "We are getting daily reports the impending overtime ban is already placing a huge burden on middle management who are expected to maintain a normal service in areas which currently depend heavily on overtime working to operate normally.
"Our members understand they are in this for the long haul and recognise that if they simply accept these changes there will be nothing to stop CASG coming back for further cuts.
"To date there is not one shred of evidence, or reassurance from management, they wouldn't be looking at more cuts further down the road".
The previous two strikes — on April 30 and May 6 — closed libraries, museums and leisure centres.
Affected were all but three libraries, one community centre and 12 sports centres CSG facilities.
The proposals include cutting all overtime payments to single time, downgrading some jobs to impose pay cuts of 500 to 2,000 per year and ending premium rates for work on six public holidays.
The arms-length organisation set up by Glasgow city council says the cuts are needed to save jobs and services.
A spokesman for CaSG said it will try to minimise disruption and advised people to check its website at www.csglasgow.org for details of any closures.