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Replacing Turbo Pump on 5975C by Yourself?

ohgo

Dear Community Members,

I noticed an error message 'VacSysFail' on our 5975C inert MSD (G3171A). The rough vacuum pump was working and the High Vacuum Pressure Gauge read 1.63e-02 torr. However, the Turbo Pump Speed went up to only 0.5% . The MS Error code was 128 'The high vacuum pump is not ready'.  I had talked with an Agilent service engineer over the phone and it would be most likely due to the turbo pump failure.

 The amount on the quote is over $20 K including the turbo pump (Pfeiffer HiPace 80, $14 K). On the other hand, prices of the used/refurbished turbo pumps are $1,500 - $8,000.
Then, my question is that has someone replaced the turbo pump by yourself, and if so, how the difficulty was?

The controller of the current turbo pump is TC 100. On the other hand, the turbo pump from Agilent (G3170-80161, if I understand correctly) seems to be using TC 110 that won’t be compatible with TC 100.
In such case, the power supply has to be also replaced (there was another item ‘HRV-TMH Power Assembly’ (I’m guessing G3170-67600)  on the quote).

Anyhow, it will be appreciated if you have any experiences.

Thank you in advance for your help.

  • 0

    Wow things in Hawaii are expensive!  We just had to replace ours last year including the controller and paid about 8K.  I helped my boss install it ourselves but he has a lot of experience, I would have been lost. You have to basically take it all apart, remove the PFTBA bulb first, remove the electronics long metal box, flip it upside down, replace the turbo pump and controller but don't overtighten the 4 screws holding the turbo because you could ruin the manifold.  

  • +1

    The combination of parts depends on the model/age/version of the 5975C and what parts have been replaced over its lifetime.  The original G3171A high vaccuum pump was the "standard" turbo, the TMH 071. The only ones of those around now in 2025 are rebuilds. To change/update/upgrade to the Pfeiffer HiPace 80 requires a kit which includes the turbo pump, turbo power supply, turbo controller, cables, bracket, fitting, a hose, and more.  The kit price assumes you will send the old pump back to be rebuilt and go into Agilent stock. The price is significantly higher if you do not send the core back.  G2589-89071 | Agilent  That Pfeiffer HiPace 80 price of $14k is for a new turbo pump only.  Unless your MS already has all the other updated parts it will not work.

    I don't flip the MS over as garyb007 suggested.  The turbo pump is held onto the manifold by four 13mm headed bolts through clamps. Two can be accessed from the right side after moving the MS away from the GC and the other two accessed after removing the entire electronics module. This is not recommended to be done by anyone who is not factory trained, of course. 

  • 0 in reply to garyb007

    Thank you for your quick reply. Yes, maintaining scientific instruments in Hawaii costs more than the US continent. Your description sounds simple, but I am sure it will be actually complicated and require experiences. I just talked with a local service field engineer and his recommendation was to ask him repair. I will still keep my research but I lean toward the repair by Agilent. Thank you again for your help.

  • 0 in reply to paulsalverda

    Thank you for your explanation with detailed information. I didn't know the details that you mentioned, that means I am not at the level to fix this issue myself at this moment. I will work with Agilent and the local field service engineer to find the best way to fix this problem. Thank you again for your help.

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