Hi chaps, just to mention, Chinese CATS were built under licence in collaberation with Caterpillar. The most popular variants being the mid sized
D6 and D7. Two such companies to mention involved were/are QINGHAI CONSTRUCTION MACHINERY PLANT which built under licence the D7G ast the QT-200T for their home market or the QTD7G for export. The other company, PENG PU MACHINE BUILDING PLANT known as SHANGHAI built the D6D under licence as the PD6Y using the CAT 3306 engine and in fact the parts between the genuine D6D and the PD6Y were known as interchangeable.
The high sprocket market CATS built under licence in China were the SHEHWA/XUANUA. Two model types were produced which were the SD7 based on the CAT D7H with power provided by a Chongqing-Cummins NT855C280 6-Pot, the other being the TYH-220 powered by the Weifang (Licenced Steyr) WD615T6 engine.
Our Chinese friends also produced Komatsu Dozers under licence with variations of power units.
Contrary to suggestions of poor build, I assume they had to have some standard of quality if they were to be granted build licences from both CAT and KOMATSU..
Maybe my friend DEAS may help further? as a good few were exported to Australia through an agency.
Politically, the licences were bought in two stages. The first, took place in 1979 when the Chinese Government bought licences from KOMATSU for production of the D80/D85 D155, later being extended to the D60/D65. In 1986, the Chinese Government then purchased the licence from CATERPILLAR to produce locally, the D6D D7G and later, the high sprocket D7H.
Hope this is of help.
Regards, Dave: