After summarizing years of unit experience, the generator manufacturer also summarized some reliable methods for estimating the price of second-hand diesel generator sets. Below, diesel generator manufacturers will share this method with you. The method can be carried out by asking one question, looking two, and trying three tests. Question 1: I ask about the purchase time, purpose and reason for the diesel generator set, the repair situation and what major parts have been replaced, and what problems are there in use, etc., so as to have a relatively comprehensive understanding of the machine. Second look: First, check whether the model is an out-of-date model, then look at the new and old degree of the diesel generator set from the appearance, check whether the parts are complete and whether there are any damage. The third test: The test machine is the specific steps: 1. Shake the flywheel up and down, if there is no sound or obvious shaking, it means that the gap between the main journal of the crankshaft and the bearing shell is not large; if there is no clicking sound, it means that the wear between the journal of the crankshaft connecting rod and the bearing shell is not serious. 2