I am not sure about the 917 bus. It probaly goes the same (or similar way as bus No 836 which I was proposed to get to Zhoukoudian - initially I took bus 917 but they told me to change into 836). From Tianqiao bus stop (I dont call it station - it's just a stop on a street) you shoud reach place called Zhou Kou Cun Lukou - no worry, bus driver will show you the place, from there it is just 2 km from Zhoukoudian (straight road).

The whole area is well marked, with all the paths are described in Chineese and English. All the places (cave of first findings, upper cave, museum) are now opened for public. Comparing to other fossil-excavation places in China it is really well maintained and preserved (and described in English).