The entire spacewalk lasted four hours and two minutes, the shortest of the three.
The Discovery crews spent much of Wednesday getting ready for a spacewalk scheduled for Thursday morning.
That set the stage for the spacewalk involving three of the space station's six-man crew.
The entire spacewalk took 5 hours and 30 minutes -- an hour less than expected.
The space agency never before staged such a fast, impromptu spacewalk for a station crew.
Monday's spacewalk was the first of two excursions by the station's crew this month.
William and Hoshide will venture outside the station on Aug. 30 to perform the second spacewalk.
Its astronauts Steve Swanson and Richard Arnold undertook the six-hour, seven-minute spacewalk required to install the truss.
Two of the Americans on board are already scheduled to conduct a spacewalk on Thursday for routine maintenance.
By coincidence, the two performed a spacewalk at this troublesome spot before, during a shuttle visit in 2009.
The first part of the spacewalk was to replace the three RSUs, each of which contains two gyroscopes.
Repairing the damage will require a spacewalk, but that must await the arrival of another Progress carrying a suitable repair kit.
The spacewalk was the 163rd spacewalk dedicated to space station construction or maintenance since construction of the outpost began in 1998.
Nasa has never allowed an astronaut to conduct a spacewalk beneath a shuttle's belly before, for fear it could easily be damaged.
BBC: NEWS | Science/Nature | Astronaut fixes shuttle problem
It marked the ninth spacewalk for Padalka and the fifth for Malenchenko.
Mr Jing, 46, is making his second spaceflight after participating in the Shenzhou-7 outing in 2008 - the mission that included China's first spacewalk.
BBC: China launches space mission with first woman astronaut
The ammonia pump was the chief suspect going into Saturday's spacewalk.
Robinson, who was accompanied on the spacewalk by crewmate Soichi Noguchi, had received instructions in a 12-page e-mail to prepare him for the removal operation.
BBC: NEWS | Science/Nature | Astronaut fixes shuttle problem
With less than 48 hours from start to finish, this marks the shortest period of time it has taken to plan and complete a spacewalk mission.
FORBES: Astronauts Perform Emergency Spacewalk To Fix Ammonia Leak
On Saturday afternoon, NASA astronauts Chris Cassidy and Tom Marshburn successfully completed a spacewalk to repair a leaky component on the outside of the International Space Station.
FORBES: Astronauts Perform Emergency Spacewalk To Fix Ammonia Leak
Instead they have found themselves on a sort of spacewalk outside it, kept alive by a barrage of protective technologies that ordinary Israelis are sick of paying for, and by miracles, which they don't believe in.
So over the course of the day on Thursday and Friday, an emergency spacewalk plan was put together and given the okay by NASA. During that time, the pump to the array was shut down, leaving the station to function on only 7 of its 8 solar arrays.
FORBES: Astronauts Perform Emergency Spacewalk To Fix Ammonia Leak
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