Scottish Water is seeking up to £85M of operated plant over six years.
The utility company advertised in OJEU for hire firms able to meet the needs of its capital and operational delivery programmes.
Equipment required includes excavators, road rollers, dumpers, cranes and concrete pumping units.
It is estimated that the three-lot framework will start in April 2015.
Suppliers have until 16 June to register their interest in the work.