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Yes have been doing this with the ballast valve but have not tried changing the oil half way through. this may be an answer thanks. will try.
I do change it after every vacuum that I do.

keep it alive with oil!

Originally posted by huskerdu
I have been using the same jb 3cfm pump for 20 years been a good unit on new installs and light pumpdowns after fixing leaks in linesets, but when I have had burnouts or trying to vacuum condensers that have had freon and oil in them I have bad luck!! It seems that it takes forever to get the 500 micron on the gauge that I want , even had to settle for a little higher # a couple times. Been talking to the boss hard about a 6cfm but not getting anywhere. Maybe after the next 4 hour pumpdown time he will think again.

I change the oil religeously after each use!!!

Are you keeping the Gas Ballast open when starting?
Have you tried an oil change at half way (2 hrs)?

http://www.jbind.com/tech_info/pdf_d...pump_instr.pdf

Go JB


"The valve should be 1/4 turn to fully open for the first part of the evacuation procedure. After a vacuum of 1000-2000 microns has been reached, close the valve and continue evacuating. Failure to close valve will result in poor pump performance."

Originally posted by Jultzya
I feel this is a better investment:

It should be- I saw one the other day at over $500.00- I think it was 6 cfm.

I have a couple of old JB's that work, but need to be gone through. Just bought a new Robinair 5 cfm pump # 15550
They were new & on sale for $149.00 at local supply house. That's cheaper than the reconditioned ones on EBAY w/ no warranty! I need light & cheap to haul up & down ladders. They get banged up pretty bad on my truck.

stephy

I keep my 15100 on the van for a spare too.

Originally posted by awsomeears
I believe I found a decent price on these, $170 shipped brand new in box.

3 CFM should be plenty and this only weighs 28 pounds witch is nice.

I have been using the 6 CFM model 15600

BTW can I speak of pricing in these posts ?

The only pricing not discused is when people ask for bid on installs and service correct ?

- Brad -

You get what you pay for...

When Roninaire sold out to SPX they really lowered their standards and quality, and price...

I'll keep my 15600......

Stephen

Originally posted by huskerdu


I change the oil religeously after each use!!!

After each normal Vac Down ?

Or

After each Vac Down with a burned out compressor ?

I have been using the same jb 3cfm pump for 20 years been a good unit on new installs and light pumpdowns after fixing leaks in linesets, but when I have had burnouts or trying to vacuum condensers that have had freon and oil in them I have bad luck!! It seems that it takes forever to get the 500 micron on the gauge that I want , even had to settle for a little higher # a couple times. Been talking to the boss hard about a 6cfm but not getting anywhere. Maybe after the next 4 hour pumpdown time he will think again.

I change the oil religeously after each use!!!

awsom

I have the #15150 spx robinair red pump and like it. Thing is heavy for the cfm though.

PROMAX

Trying to keep my start up cost at a minium I found this unit. PROMAX model PMPROVAX Combines recovery and vacuum in one unit. What do you PRO's think?

WOW...........

I have been reading alot of great things about JB on these boards.

TO be honest the Vac Pump I buy wont be used everyday, mabye once a week.

I'm not looking for the cheap way out but dam im not rich :-)

Just looking for feedback, great so far guys :-)

- brad -

when I was doing change outs..ran my JB 6cfm pump every day...after only 6 weeks it sounded like rocks in the gear box....took it back to Johnstones were I got it...got the over the counter no BS warrenty...handed them the dead one..swore I changed oil every day..2x on sunday ...they handed me a new one....even got a 2nd free t-shirt.

JB seems like good products...and they do stand behind their pumps.

I feel this is a better investment:

I believe I found a decent price on these, $170 shipped brand new in box.

3 CFM should be plenty and this only weighs 28 pounds witch is nice.

I have been using the 6 CFM model 15600

BTW can I speak of pricing in these posts ?

The only pricing not discused is when people ask for bid on installs and service correct ?

- Brad -