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Old 12-08-2017, 10:17 AM   #1
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Sherwood R10870G assembly

I recently did a major pump rebuild of my raw water pump, Sherwood R10870G. This should be good for 4 years. After 125 hours of use the main bearing crapped out - as in disintegrated.

Either: 1-The bearing was defective, or 2-I reassembled the pump incorrectly.

Given my mechanical abilities, I can't rule out #2. The Service Bulletin says "Note how the seal and seat assembly are arranged so they can be properly reassembled." Perhaps I did not "note" the arrangement correctly.

Does anyone have a picture of how the internal seals fit on the shaft? I have a color schematic on the "R Series Technical Guide" but it is a little short on the critical details.

John
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Old 12-09-2017, 01:11 AM   #2
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I recently did a major pump rebuild of my raw water pump, Sherwood R10870G. This should be good for 4 years. After 125 hours of use the main bearing crapped out - as in disintegrated.

Either: 1-The bearing was defective, or 2-I reassembled the pump incorrectly.

Given my mechanical abilities, I can't rule out #2. The Service Bulletin says "Note how the seal and seat assembly are arranged so they can be properly reassembled." Perhaps I did not "note" the arrangement correctly.

Does anyone have a picture of how the internal seals fit on the shaft? I have a color schematic on the "R Series Technical Guide" but it is a little short on the critical details.

John
Hi John,

I hope it this help your projekt side 35 is R series exploer pictures etc.

http://r.duckduckgo.com/l/?kh=-1&udd...22_ENGLISH.pdf

NBs
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Old 12-09-2017, 09:15 AM   #3
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Hi John,

I hope it this help your projekt side 35 is R series exploer pictures etc.

http://r.duckduckgo.com/l/?kh=-1&udd...22_ENGLISH.pdf

NBs


Hey NBs,

Thanks for that link. For some reason the graphic resolution is a little better than the one I have of the same tech guide.

I have sent an inquiry to Sherwood to ask about the proper positioning of the seal. We'll see what their tech support is like.

John
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Old 12-09-2017, 09:53 AM   #4
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Buy the parts from Depco Pump and they can usually help you if Sherwood can't. Or treat yourself to an early Christmas and have them rebuild it.
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Old 12-09-2017, 10:07 AM   #5
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I enlarged this view of a technical drawing of your pump that appears to illustrate the relationship of the seal to the seat assembly. Good luck
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Old 12-09-2017, 09:18 PM   #6
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Buy the parts from Depco Pump and they can usually help you if Sherwood can't. Or treat yourself to an early Christmas and have them rebuild it.


Thanks for the tip about Depco Pumps. Their pump catalogs are quite the resource. For parts I'm quite wedded to Niemiec Marine in New Bedford. There are close by and very reasonably priced.
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Old 12-09-2017, 09:20 PM   #7
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I enlarged this view of a technical drawing of your pump that appears to illustrate the relationship of the seal to the seat assembly. Good luck


Thanks Larry,

I have that schematic. The problem is that there is one section that has about four pieces, and it's unclear how they fit together.
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Old 12-09-2017, 09:23 PM   #8
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Sherwood has responded back to me and will follow up on Monday.
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Old 12-10-2017, 06:51 AM   #9
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Thanks for the tip about Depco Pumps. Their pump catalogs are quite the resource. For parts I'm quite wedded to Niemiec Marine in New Bedford. There are close by and very reasonably priced.
Niemiec
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Old 12-10-2017, 02:57 PM   #10
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So two days ago I contacted Sherwood Pumps.

Yesterday they opined that it might not be a bearing failure by itself. A seal failure can lead to a bearing failure, which can lead to housing wear. Pump repairs where the housing is worn are problematic. They said that 1988 was a long time ago for a pump that pumps raw sea water.

(This pump had been yanked off by the PO and saved but not rebuilt....hmm.)

Today I got the schematics I needed.

Excellent service over a weekend. These guys know about the need for quick answers when your engine is out.
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Old 12-10-2017, 03:51 PM   #11
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I think the cover contains a solid graphite bearing. They do wear.
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Old 12-10-2017, 05:22 PM   #12
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Thanks Dave,

Yes, the graphite bushing is in the major repair kit for these. Actually the major repair kit has every thing but the housing and shaft.

Just want to correct myself on one thing. I contacted Sherwood yesterday morning, and got the answer this afternoon at 2:30. So it was not two days, but 29 hour turn-around on a weekend!

John
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