I know my way around a John Deere 690E LC pretty well but have never been around a 790E. I am wondering if many parts are interchangeable. Specifically, the hydraulic swing motor? The 690ELC has a Linde Type MMF-63 Swing Motor. Does anyone happen to know what's on a 790E? I may be able to source one off of a790E If it would fit, it's a long way from me though.
Are the 690E and 790E both made by JD or is the 790 sourced from Hitachi? I thought the 690E were last machines built by JD but not sure about the 790E. A brochure shows the 790E and 892. The 892 is a 300 Hitachi. I knew a guy that dug pipeline and wanted an Hitachi but had to settle for a JD because of the arrangement with Hitachi in Canada /N.America. He much preferred the Isuzu engine and I think it sat lower so the hyd. pump inlets were lower.
The 790E swing motor is not remotely close to a 690E swing motor. Pic of 790e swing motor below. What happened to your swing motor ?
One of f the brass sleeves came apart.
Interesting, that’s the same type of failure that was occurring in the main hydraulic pump. To help alleviate the problem , in the early 90’s Deere recommended to change the hydraulic oil to 10W30 oil in 690Es and 690Ds
FYI, the 690E cab is the same as 490E thru 992E. I tried to respond to your Wanted cab door parts thread but the site won’t let me.
Thank you
We run 10W30 oil but it probably had regular hyd oil for years before we got it