DNM500 TSC rotary union replacement
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  1. #1
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    Default DNM500 TSC rotary union replacement

    The rotary union on my DNM500 is shot. Leakin'...........The ceramic surfaces are chowdered. Replacement is $1200?!!!??? Huh? Is that correct? A fitting with two pieces of ceramic sandwiched in the middle.............Are they machine specific? Off the shelf? Easy fix, spendy lil part......................

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    I've replaced two of ours over the last half a dozen years or so.

    Direct from Deublin, about £350.

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    Quote Originally Posted by gregormarwick View Post
    I've replaced two of ours over the last half a dozen years or so.

    Direct from Deublin, about £350.
    I'm not a huge fan of Deublin...

    I've change our Doosan DNM500 one 2 times in 9 years. I've also changed the one in my Yasda two times in 3 years (2016 Yasda probably has more cut hours runnign 24/7 then the 2010 Doosan LOL). We reduced the 1000 PSI pump from Chipblaster to 900 PSI . Hopefully solve that issue.

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    Not a direct comparison but ceramic seals in a coolant pump that I run around 70 psi. I used to replace them every year or two when I filtered to 20 microns nominal, bag filters. Since I started filtering to 1 micron absolute, cartridge filters, I haven't changed one since, and it's been around 12 years or so. This is grinding stone, ceramic, and quartz.

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    Quote Originally Posted by DavidScott View Post
    Not a direct comparison but ceramic seals in a coolant pump that I run around 70 psi. I used to replace them every year or two when I filtered to 20 microns nominal, bag filters. Since I started filtering to 1 micron absolute, cartridge filters, I haven't changed one since, and it's been around 12 years or so. This is grinding stone, ceramic, and quartz.
    How are you filtering? The yasda has a 5 micron filter I think.


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