Gear pump seals

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Tazza

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Has anyone replaced the seals on a gear pump before? From memory, when they are in place they sort of look like a "W", i was just wondering if they are made that way or if they are simply an O-ring that you install into the seal groove and over time as the O-ring hardens up it looks like it was made specially.
The only reason i ask is because i wanted to pull the pump down on my 751 to ensure its all clean, i can also check for wear while in there. The charge pressure line to the pump was burnt, this turned the inside the the hose to carbon that is all through the hydrostats. Only a small amount made it to the rotating groups but its throughout the charge pressure poppets, so it needs a good clean out. I don't want to clean the hydrostats out and leave the gear pump alone and find later that there was muck in it that caused it to fail.
Photos will follow of the charge port stuffed full of burnt rubber. I will also try and take pics of the inside of the pumps when i get to the stage of cleaning and re-assembling if anyone is interested.
 
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Tazza

Moderator
Staff member
Joined
Dec 7, 2004
Messages
16,840
Never mind, i pulled the pump today and it has 2 O rings, one front one back and it has a *special* seal and backup ring to hold the high pressure away from the low pressure sides (one front one back). I just hope i can get away without buying a seal kit, its a little spendy.... The dealer wasn't sure what pump i had as i didn't have the numbers off it, but i was quoted $134 and $180 for the seal kit..... The good thing is if i really need to replace it i can pull it out fairly easily.
 

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