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Thread: What causes bevel gear failure?

  1. #1
    Join Date
    Mar 2008
    Location
    near Philly
    Posts
    5

    Default What causes bevel gear failure?

    I just got the bad news from my dealer that the bevel gear needs to be replaced on my '04 XC at 74,000 miles. The cost is about $2300 US. I would like to know what causes this failure and if there is anything that can be done (by me, the owner/driver) to lessen the probability of it happening again. I asked these same questions to the Service Advisor, but she really did not have any answers.

  2. #2
    Join Date
    Jun 2003
    Location
    South Lake Tahoe, CA
    Posts
    604

    Default

    I don't know what makes them fail, but I am a little worried about some noise that is developing when I drive up a moderate hill. As the car is stressed by the hill I can hear a low pitched growling like noise. What are your symptoms?
    Wait Griswold
    2003 XC70
    South Lake Tahoe, CA

  3. #3
    Join Date
    Mar 2008
    Location
    near Philly
    Posts
    5

    Default My Symptoms

    I first noticed some RF wheel slippage, more noticable on wet roads. It started slowly, but then by a few days ago it the slippage was so pronounced that it was obviously a problem. By slippage, I mean that the tire was spinnning, no traction.

  4. #4
    Join Date
    Nov 2003
    Location
    Out West
    Posts
    1,240

    Default

    What was the bevel gear lube, again? Maybe I will check mine at 70K miles. But that would be a lot of lube to weep out, I think I would have noticed that along with the drips since new from the turbo.
    '04 XC70, Ice White, Taupe, Premium, Touring, HID, Rear Bash Plate, Subwoofer+PA300, Nokian Hakka 2 235/60-16 + Michelin Primacy 235/55-17.
    Original owner.

  5. #5
    Join Date
    Feb 2003
    Location
    Dimock, PA
    Posts
    1,493

    Default

    Gibbons,

    Volvo Tech-Net Notes No 40-04, 10-13-2005, lists API GL5, BOT as the angle gear lube. Volvo part number 1161648. I know it is a synthetic lubricant and have been told that it is a 75W90 and the "BOT" designation probably refers to low foaming or exta low foaming. See this thread:
    http://www.volvoxc.com/forums/showthread.php?t=8001
    I buy the Volvo fluid when replacing the angle gear lubricant in my vehicles.
    Bill
    03 XC70 OSD (Traded-in 4/12)
    05 AWD S80 OSD
    12 XC70 T6

  6. #6
    Join Date
    Mar 2008
    Location
    near Philly
    Posts
    5

    Default Seals were not leaking

    I did specifically ask about the seals, and they told me they were not leaking, for what its worth. The car has been dealer maintained since new. It seems to me that it is simply just a poorly engineered system. 75 k is nothing for a drive train component. I expressed my opinion and told them that I have been a loyal Volvo customer for years (currenlty on my third one) but that it would probably be my last.

  7. #7
    Join Date
    Mar 2005
    Location
    Pacific Northwest
    Posts
    1,481

    Default

    Quote Originally Posted by bcr72 View Post
    I did specifically ask about the seals, and they told me they were not leaking, for what its worth. The car has been dealer maintained since new. It seems to me that it is simply just a poorly engineered system. 75 k is nothing for a drive train component. I expressed my opinion and told them that I have been a loyal Volvo customer for years (currenlty on my third one) but that it would probably be my last.
    Before they go and replace the whole BG unit, you should ask them what is wrong with it.

    I've read 2 failure modes in this unit on these forums

    1. No lubrication. Gears are probably ruined if the BG oil leaks out. If you have no evidence of a leak... and fluid have always been in there, your gears should be okay at this mileage. You can ask them if the fluid level is okay (easy to check yourself although I'm not sure you are a DIY guy)

    2. Transmission to BG sleeve gets stripped. If this happens, you actually don't need to replace the BG. Just the sleeve. Here is a whole thread on this with pictures + diagrams.

    http://www.volvoxc.com/forums/showthread.php?t=12121
    SOLD 2001 V70XC @123k 20mpg. No more Volvos due to shift to better gas mileage
    SOLD 2001 V70 T5 @132k 22mpg.
    2013 Tesla Model S 85kWhr 21k miles 90 eMPG. Best car ever
    2011 Toyota Prius Model2 49k 60mpg
    2001 VW Golf GLS 1.8T Auto 145k Fahrvergnügen but only 24mpg
    http://freewebs.com/howardsvolvos/

  8. #8
    Join Date
    Jul 2007
    Posts
    129

    Default

    Our 2001 XC has 149k on original bevel gear, never touched. I am not over eager to have it replaced at this stage either.

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