First I'm not a OSTER tech. But I have worked on similar table top semi-automatic machines. You should call your vendor for service as there is no customer serviceable parts in this machine. (Yes, I know you tried)
*** the following is for information only. ***
* If your leaking at or under the water tank then check for crack or you may be missing a rubber seal, o-ring, or washer. Replace the whole tank as a unit.
* If your leaking at the bottom, drip tray, or side only when the pump buzzes (pumping water) then there is a cracked or disconnected hose line or fitting. Check the hoses to the pump.
* If your leaking when the steam wand is in use then there is a similar problem with the 2nd pump system.
* The pressure is usually preset in the vibration pump. Some pumps have an adjustable spring regulator but since you have not touched this then either the spring is broken or stuck. You will have to disassemble the pump which is very tedious. I will leave several links below. Take your time and lay out the parts on a clean (colored) towel. Avoid using a white towel as some parts are also white.
* Final; Leaking water and electrical equipment is not a good idea. Best to be safe. Unplug, wipe down, and look for leaks.
Aloha, ukeboy57
Review: https://www.bing.com/videos/search?q=Oster+expresso+machine+model+BV+7701&&view=detail&mid=8D44E80B917873AAEC198D44E80B917873AAEC19&&FORM=VRDGAR
Vibration Pump Detailed: https://www.bing.com/videos/search?q=vibration+pump&&view=detail&mid=2755F4CAAFABE5AB0B842755F4CAAFABE5AB0B84&&FORM=VRDGAR
How to Replace Vibration Pump: https://www.bing.com/videos/search?q=vibration+pump&&view=detail&mid=73AF5C8C07F9643C756573AF5C8C07F9643C7565&&FORM=VRDGAR
Pump Test Bed:https://www.bing.com/videos/search?q=vibration+pump&&view=detail&mid=5B6A22D3EBC6F18FD0535B6A22D3EBC6F18FD053&&FORM=VRDGAR
PS Okay sorry I thought there was a posted video of the actual dis-assembly of the vibration pump. Looks like I will have to post my own tear down of this type of pump. I have several old ones. They are common on Amazon.com
https://www.amazon.com/Ulka-Pump-Model-Type-EAX5/dp/B00UCH2NQ0/ref=sr_1_6?ie=UTF8&qid=1518574987&sr=8-6&keywords=vibration+pump
Amazon com Ulka Pump Model EA Type EAX5 120V 60Hz 52W...
Shop ULKA at the Amazon Small...
SOURCE: Hoover Steam Vac Dual Rinse Model F7205-910
Machine's on board Fluid containers have rubber stoppers with valves that open when it the container is put in place on the machine. The container may be broken around the rubber stopper. The container may need to be replaced.
SOURCE: Leaking water from steamer
For the grouphead check the basket there might be a slight bump around the edge that is preventing it from making a good seal when it contacts the gasket in the head. If the Double works fine then the gasket is not the problem.
For the steam wand try flushing wand for 3 seconds just before steaming, if that does not help with the watery milk, then the boiler is not getting hot enough to produce steam.
SOURCE: Leaking water from the group and steam spout
Hi there,
You will need to take the machine apart completely as there are more gaskets inside the group head. You can buy an old group service kit at www.theespressoshop.co.uk for about £20 and it comes with an exploded diagram so you can see what goes where. Don't worry there is no technical mechanical solenoid like the last comment stated. I repair these machines for a living and all it needs is a good service.
All the best
LaPavoniBoy
SOURCE: I have a 14 month old Sirena expresso machine. It
Check the thermostat or element on the top of the machine.
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