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My komatsu pc75-uu3 excavator is hanging at various points…

My komatsu pc75-uu3 excavator is...
My komatsu pc75-uu3 excavator is hanging at various points on right hand swing.It swings smoothly on left swing.I pulled the swing motor/planitary unit out, took apart,& inspected all gears.bearings,thrust washers,& housings.All were in great shape.Before I go to all the work to get swing frame out to look at the ring gear is it likely to be in the ring gear?note that right swing don't hang at the same point every time.It may turn 1/2 turn one time &1/8 turn the next time.when it hangs you can back it up 2 inches & it will free up & turn so much & hang again.Is there anything else that will cause this in only one direction?
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12/13/2016
Mechanic: Dan, Technician replied 5 years ago
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 15,110
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
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Hi my name is***** is your machine serial number?

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Mechanic: Dan, Technician replied 5 years ago

check both the swing gearbox for metal and the hydraulic return filter which would indicate an internal failure occurring. Let me know

Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 15,110
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
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Mechanic: Dan, Technician replied 5 years ago
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Dan
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 15,110
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