It lifts capacity weight with no problem as long as you rev the engine- the engine doesn't bog or miss, etc?
Having to rev the engine on newer units to lift any weight at all is common- older lifts had a different style of hyd. system which would easily lift weight at idle- now this is not the case.
As far as having trouble climbing a grade, I assume the engine is accelerating but the unit fails to move? If this is correct- does it have trouble in both forward & reverse?
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