You can quite easily miss one of the pins that goes in very close to the rear of the spur gear, just make sure all the pins are there...
Other than that not aware of any problems, contaminated slipper pad perhaps?
May be worth stripping down and cleaning the slipper plates etc with some contact cleaner to make sure there is no grease or oil on them, normally with anything metal thats been machined you will get traces of oil which will need to be removed...
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