On my son’s 147 we had similar problems and after replacing a bearing in the lower part of the housing,wire wheeling the worm gear and lubing as well as cleaning up the motor armature it started working decent. What REALLY helped though was installing a spring assist. I’m talking about snugging that baby down so much that the lift won’t go down if an implement is not attached! That being said we still weren’t happy with the up and down speed and found a linear actuator. World of difference with those since the motor and the ram are parallel.
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