Presoak - Cat 3K133 - What seals - High Temp/Strong Chemical /Mild Chemical?

[Rainway]

I have a Coleman Hanna WW2.0, the pump stand has two "CAT 3K133" pumps - one for low pH and one for high pH.

I was thinking that whether it's the low pH or high pH pump that I need the High Temp seal assembly - but then I got to second guessing myself so am wondering if anyone out there knows for sure. Looking back at my orders I see from Kleen-Rite I've ordered mild chemical seals and got to thinking maybe that was why I've had seals fail after not much time. So I'm looking to the real experts out there and trying to find out once and for all if I should be using High Temp seals, mild chemical seals, strong chemical seals or what and for which pump (low pH or high pH)...

Here's the pump# breakout from Cat's service manual:



and here's the seal list:


The CH parts manual only has an arrow going to one of the pumps and lists the part number as 32-3k133mt3 but that's CH's unique number not something from Cat.


Thanks!

 

[Greg Pack]

I think Coleman uses 899002 and they hold up well to highly alkaline solutions. HF will destroy these pumps over time though.