Originally posted by mtmcgavock
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For those that think the hr92 is too noisy.
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Originally posted by mtmcgavock View PostAlso it depends how well your open vented system fills back up, we’ve had systems where you spend longer trying to get air locks out than you did actually doing the job.
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Originally posted by DBMandrake View PostThe one I tested was quieter than the HR92's, but not by a lot. The main difference in noise I found wasn't the motor, but the gearbox.
The HR92's have plastic gears with poor meshing tolerance and minimum lubrication that have a tendency to grind against each other and that's where most of the noise comes from. Some of mine grind/click periodically as they turn, some don't. The HR91 had no grinding/clicking noise, just a quiet whirr from the motor, but the motor whirr was only a little bit less.
The HR92's can be made a bit quieter by putting some white plastic gear grease on the gears.
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Originally posted by oshingler View PostHi - could you recommend a specific grease I could use on the gears please without breaking things? There seems to be some discussion over whether to use lithium or silicone-based products and using the wrong one could crust or mangle your gears!
Thanks
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Originally posted by oshingler View PostHi - could you recommend a specific grease I could use on the gears please without breaking things? There seems to be some discussion over whether to use lithium or silicone-based products and using the wrong one could crust or mangle your gears!
Silicone greases also work with plastic gears and don't harm natural rubber so are probably a safer choice and probably more commonly used with plastic gear mechanisms.
What you shouldn't do is mix Lithium and Silicone greases together - the resultant can go hard and tacky. I don't think there is any grease used at all when the HR92's are manufactured though, I don't remember seeing any...so there is no existing grease to worry about mixing with.
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