romanhands Senior Member Joined: 3 Nov 2013 Posts: 13 Location: south dakot Expertise: Just starting
Espresso: proteo grande Grinder: antique wooden hand grinder
Posted Wed Nov 20, 2013, 12:01pm Subject: Pump damage with too much pressure?
i have a proteo grande- likely mid 90's. like new. i'm new to the home brew world and am learning how to pull a good shot. question: if i overpack the filter and/or ground is TOO fine, will this cause damage to the pump in the machine?
the reason i ask... as i was experimenting this morning, i could tell immediately that i had either tamped it too much and/or grinds were too fine. i let it go anyway and it was just drip-drip-drip-drip for about 45 seconds. the pump was clearly overworked. but i just wanted to finish the pull and see what effect this had on flavor, crema, etc (i'm a scientist by education, couldn't help myself). then it occurred to me that maybe this was bad for the machine. so... is it bad for the machine, or is there some kind of internal pressure release valve in the case that it's overloaded? worse yet, might i have ruined the pump???
SStones Senior Member Joined: 24 Nov 2012 Posts: 510 Location: Canada Expertise: Professional
Espresso: Giga 5, ECM Giotto, Rocket... Grinder: Anfim Milano-Best Vac Pot: No :( Drip: Some $30 thing from Walmart Roaster: I buy pre-roasted.
Posted Thu Nov 28, 2013, 7:01pm Subject: Re: Pump damage with too much pressure?
So long as the pump is pumping and the water is flowing somewhere (Over the relief if nowhere else), then the pump is fine. Letting a pump continue to run when stalled (Just humming, not moving any water) can cause overheating if you keep it up for too long. 20 seconds shouldn't hurt anything. Even the cheapest of vibe pumps, like the 41 watt Ulkas claim a 1:1.5 duty cycle. Nothing wrong with running them against max pressure for a minute so long as they're moving the water.
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