Question about Robinair Vacumaster 5 Cfm Vacuum Pump 2 Stage 15500

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Robinair vaccum pump pumping but not deep

I have a robinair 15500 vaccum pump that is pumping but takes all day to vaccum down the smallest sealed system. i know this is not normal but i just need to know if i can repair or just buy a new one.

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  • 349 Answers

Google vaccum pump repair will probally be cheaper.
They have the one you have on ebay for abot $169.00

Posted on May 17, 2010

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Posted on Jan 02, 2017

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HELLO I HAVE A ROBINAIR 34788, MY UNIT WILL NOT CLEAR THE LINES. I TRIED SHUTTING OFF AND ON , BUT LINES ARE STILL HOLDING PRESSURE. I ALSO CANT RECOVER BECAUSE IT WILL NOT GET PAST CLEARING. THANK YOU


sounds like you need to check the grommet between the motor and the pump. If this grommet connector breaks, the motor will come on but the pump will not work. Turn the unit upside down and look where the motor connects to the pump. Be aware if you can lose your oil while turning upside down unless you cap the port and exhaust. If this is it, go straight to the Robinair web site and you can order one for around $25.

May 11, 2011 | Robinair CoolTech 6 CFM Two Stage Vacuum...

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We have a robinair cooltech 34700z, looking for directions to change pump oil, can anyone help? thanks


For change vacuum pump oil follow the bellow step: Press main menu then keep pressing up or down arrow key till display show "CHANGE VACUUM OIL" then press "YES" key. Now vacuum pump will run for two minute & stop automatically. When pump stop you just open the oil drain cap and drain all used oil from pump (oil drain cap located outside of the machine near high & low side hose). After draining all used oil replace oil drain cap and fill 5 ounce new ROBINAIR vacuum pump oil then press "YES" key and keep filling oil up to middle of sight glass of vacuum pump. Press "STOP" key to complete the process.

NOTE: Do not over fill the pump & do not use any COMPRESSOR oil on the vacuum pump!
Hope this will help you & if it is please vote for my support
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Hope this will help you. If so please vote for it. Good luck

Apr 08, 2011 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

I have a robinair 34700zasking me if i wanna change the oil nowhow do i do that and what type of oil i need to use?....ty


You have run the machine 10+ hours for vacuum since last oil change. so you have to change vacuum pump oil. For change vacuum pump oil just follow the bellow step: Press main menu then keep pressing up or down arrow key till display show "CHANGE VACUUM OIL'' then press "YES" key. Now vacuum pmp will run for two minute & stop automaticly. When pump stop you just open the oil drain plug & oil fill cap of vacuum pump ( Located oute side of the machine near high & low side hose ) & drain all oil from vacuum pump. After draining used oil,replace oil drain plug & fill new ROBINAIR vacuum pump oil till middel of sight glass.Press "YES" key & follow on screen messeage. NOTE: Do not over fill the pump & Do not use any COMPRESSOR oil on the vacuum pump!
Hope this will help you & if it is please vote for my support.

Jul 05, 2010 | Robinair Cool Tech 34700Z Recovery,...

2 Answers

Can you use this pump to vaccum r-22 systems the robinair vaccummaster 6cfm


Yes you can,as long as you have fresh oil & it'll pull the system below 500 microns,you shouldn't have a problem.

Jan 09, 2010 | Robinair 6 Cfm 2 Stage Vacuum Pump, R 12/R...

1 Answer

What is the exhaust fitting for. Am I suppose to


The cap is just to keep trash out of the machine. It usually has no filter, just lets vacuumed chemical straight out to atmosphere.

Jan 04, 2010 | Robinair Vacumaster 5 Cfm Vacuum Pump 2...

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The jets quit working when I prime and attach the vaccum hose


you could have a leak in the vac hose or a shaft seal on the pump, if there is a wet spot under your pump there is a good chance the shaft seal is BAD.... some pumps are so strong you can starve the PUMP for water, the trick is to set your valve more towards the main drain./ hope this helps.. i'm your local pool pump motor repair guy

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