Hello I have a older robin air 134 a recovery machine , The one with the gauges mounted on the top . The problem iam having is that pressure leaks back into the low side of the gauge after pulling a vac, When i recover it will nt pull down to zero . Thers something in the machine like a solnoid or something thats not closing all the way. Thanks for the help Mike ..

Hasan Khan Amran

• 184 Answers
• Posted on Dec 29, 2009

SOURCE: I have a Robinair 34134Z It will not recover freon

Please check the following: 1# Check the recovered amount of refrigerant since the last filter change(Max.filter cap.150 LBS/68 KG).If more then this you must change spin-on filter & vacuum pump oil.2# Check with vacuum gauge on compressor test(During compressor running) port & make sure it has 13"HG of suction,If suction less then 13''HG then you have to replace the compressor.3# Check all tank hose (Vaipor,Air purge & Liquid) is connected on the ISV tank quick seal.(Do not over tight).Hope this will solve your problem.

Hasan Khan Amran

• 184 Answers
• Posted on May 21, 2010

SOURCE: I have a robin air recovery station for R12, My

Sorry you can not make this only with changing spin-on filter.because have to also change other things such as service coupler,ISV tank,manifold gauge etc.

Hasan Khan Amran

• 184 Answers
• Posted on Jul 10, 2010

SOURCE: Robinair 34700 recovery problem

It sound like one of the pressure trunsducer is not working or disconnected from the manifold assy.or from ISV tank.Please check Low,High and ISV tank pressure transducer

Hasan Khan Amran

• 184 Answers
• Posted on Mar 31, 2011

SOURCE: Hi, my robinair 34700Z dispays

You can try the following:1# Check (In main manifold assy.) recovery solenoid (No-1) and make sure coil is not burne or may need to rebuild. If so,replace new coil or rebuild solenoid flunger.2# Check (In small manifold back side of the machine) Inlet low & high side solenoids (small solenoid's No-10/11, and No-13/14) is receiveng power & opening properly.
Also you may need to calibrate pressure transducer or replace new one.
Hope this will help you. Good luck!

SOURCE: no matter what we try

Hi,
It sounds like you have a bad high pressure sensor/switch... have you been able to verify what the high pressure is??? The machine has a high pressure gauge... what is that saying??? If the gauge verifies the high pressure then you have a plug or at least a restriction, probably a plugged filter. Follow the small line from the compressor to the filter and change that out. the high pressure sensor will also be on that line before the filter.

heatman101