They are trying to fix a jammed joint that is supposed to keep the station's solar panels pointed towards the sun.
Scientists are still struggling to repair a new recycling system intended to convert astronauts' urine into drinking water.
During a previous space walk, the astronauts accidentally lost a tool box worth more than $100,000 (£65,000).
This was the third spacewalk made by the crew to repair the International Space Station' solar panels.
Astronauts Heidemarie Stefanyshyn-Piper and Stephen Bowen sent almost seven hours working on the defective joint.
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