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Welch 1400 oil case
Lots of stinky sludge and rust. This mess was still in the pump after several oil flushings...
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Uploaded on Feb 3, 2010
Shaft seal from 1400 pump
It was stuck to the shaft and the rubber parts were goo.
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Uploaded on Feb 3, 2010
Welch 1400 as received
That's the original belt! At least it turned over. The Ebay seller I bought it from spruced it up...
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Uploaded on Feb 3, 2010
1410 and 1400 pumps
I started on the single stage1410 first but then switched over to the 1400 because it's a two-stage....
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Uploaded on Feb 3, 2010
Rebuilt 1400 testing
Alive and well purring along at 15 millitorr after years of neglect
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Uploaded on Feb 3, 2010
15 millitorr !
Varian 801 gauge wired to 531 thermocouple tube on pump. Thanks to Steve Hansen generous donation of...
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Uploaded on Feb 3, 2010
rebuilt 1400
Metal instruction plate telling me I shouldn't take it apart. Photo taken with pump running at 15...
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Uploaded on Feb 3, 2010
1400 serial number plate
Side of 1950s 1400 pump after rebuild. I made gaskets from vegitable fiber gasket paper...
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Uploaded on Feb 3, 2010
Inside 1400 pump
Notice something missing? I never found the exhaust valve.
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Uploaded on Feb 3, 2010
1400 case opened
Lots of sludge and rust. Nobody ever changed the oil for decades. Pump still pulled 100 millitorr.
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Uploaded on Feb 3, 2010
Welch 1400 vacuum pump
Turbo GT Conversion
Metal Vacuum Chamber
Rewind MOT
