I would like to ask the experts: if the two gears of a helical gear set are not parallel, will the gear meshing clearance change?
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Bevel gears: Does the clearance change when the two gears do not mesh parallel to each other?
Yes, what kind of pump are you repairing? Double screw or Roots? Each time it is installed, the relative position of the two impellers must be determined by adjusting the relative position of the gears along the axis. If the synchronizing gears do not have any adjustment mechanism, care must be taken to ensure that they are installed firmly; generally, it is necessary to tighten the gear cover until it is secure, then use a copper rod to shake the gears, repeating this process three times. After that, the gap between the two impellers should be measured – ideally, it should be half of the total gap, with the gap in the driving direction being slightly larger than that in the driven direction
For Roots vacuum pumps, the shaft that needs to be adjusted is tapered; this applies to the disassembly and installation of compression pumps
The main thing is to get the clearance between the two impellers right