Running out to a john deere 7810 to figure out whether the linkage for shuttle control is froze up or control valve in shift valve housing. https://www.facebook.com/warren.lane.5872 https://www.instagram.com/wlrfixinit/
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https://www.youtube.com/watch?v=HWDjaIhWvvI
This dozer had no high range on the left track, disassembling the machine to access the blown hydraulic hose inside the bevel gear compartment.
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https://www.youtube.com/watch?v=tkcOWHrnp0w