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1940 10EE Round Dial Gearbox Bearings

TJS82

New member
Hey everyone! I recently picked up a 10EE at a local auction, and am doing a full teardown. I've noticed that there isn't a ton of info out there on the gearboxes in these machines (or perhaps I just haven't looked hard enough). Most everything in my machine's gearbox seems to be in pretty decent order, but since the original bearing manufacturer is no longer around, I decided to record their part numbers and dimensions for future reference if I or anyone else needs to source new bearings from a different manufacturer. I have already learned an IMMENSE amount about these machines from this forum, so i figured I would contribute what I can. If this info has been posted elsewhere already, please let me know and I will delete this thread. If not, hopefully someone finds it useful. Below is a link for the PDF I found on Vintage Machinery with the parts diagram I used to reference the bearing names and Monarch diagram numbers (Part diagram E-4, PDF page 17).

http://vintagemachinery.org/pubs/2103/3419.pdf


Monarch 10EE Gearbox Bearings

Machine: 10” 10EE Round Dial
Swing: 12.5”
Dist. Between Centers: 20”
Serial #: 8387
MFG Date: 8-1940


Feed Shaft Bearing L.H. - E-4 #15
New Departure #: C87504 (Metal shields on both sides, with offset inner race)
ID: 20mm
OD: 47mm
Inner Race Thickness: 15.25mm
Outer Race Thickness: 14mm
Offset Depth On Inboard Side: -0.5mm
Offset Protrusion On Outboard Side: 2mm

Feed Shaft Bearing R.H. - E-4 #17
New Departure #: 3204
ID: 20mm
OD: 47mm
Thickness: 14mm

Change Gear Stud Bearing L.H. - E-4 #25
New Departure #: C8505
ID:25mm
OD:52mm
Thickness:15mm

Change Gear Stud Bearing R.H. - E-4 #26
New Departure #: Didn’t remove bearing, number unknown. (Angular contact, Inner race thicker than outer race)
ID:25mm
OD:52mm
Inner Race Thickness: 17mm
Outer Race Thickness: 14mm
Flange Thickness: 3.75mm

Tumbler Shaft Bearing L.H. - E-4 #31
New Departure #: 3203
ID: 17mm
OD: 40mm
Thickness: 12mm

Tumbler Shaft Bearing R.H. - E-4 #40
New Departure #: 3204
ID:20mm
OD: 47mm
Thickness: 14mm

Cone Shaft Bearing L.H. - E-4 #55
New Departure #: C8504 (Prefix C - metal slinger-type seal on one side)
ID:20mm
OD: 47mm
Thickness: 14mm

Cone Shaft Bearing R.H. - E-4 #61
New Departure #: 3204
ID: 20mm
OD: 47mm
Thickness: 14mm

Clutch Shaft Bearing L.H. - E-4 #67
New Departure #: 3204
ID: 20mm
OD: 47mm
Thickness: 14mm

Clutch Shaft Bearing R.H. - E-4 #75
New Departure #: 3204
ID: 20mm
OD: 47mm
Thickness: 14mm

Leadscrew Shaft Bearing L.H. - E-4 #79
New Departure #: N20303 (Angular contact, Prefix N - flanged outer ring)
ID:17mm
Minor OD: 47mm
Flange OD: 50mm
Overall Thickness: 14mm
Flange Thickness: 3.5mm

Leadscrew Shaft Bearing R.H. - E-4 #90
New Departure #: N20205 (Angular contact, Prefix N - flanged outer ring)
ID: 25mm
Minor OD: 52mm
Flange OD: 55mm
Thickness: 15mm
Flange Thickness: 3.75mm

Feed Rod Stem Bearing L.H. - E-4 #95
New Departure #: C87503 (Metal shields on both sides, with offset inner race)
ID: 17mm
OD: 40mm
Thickness: 12mm
Inner Race Thickness: 13.75mm
Offset depth on inboard side: -0.5mm
Offset protrusion on outboard side: 2.25mm

Feed Rod Stem Bearing R.H. - E-4 #98
New Departure #: C87503 (Metal shields on both sides, with offset inner race)
ID: 17mm
OD: 40mm
Thickness: 12mm
Inner Race Thickness: 13.75mm
Offset depth on inboard side: -0.5mm
Offset protrusion on outboard side: 2.25mm
 

dinotom

New member
Those are mostly correct. The original inner bearing for the change gear (inside the bearing cap, part #27) is a raceless bearing New Departure NM0205, no longer found. The old one can be easily cleaned and re-lubed (it runs bathed in oil anyway). The other bearing (outward facing in the bearing cap, part #27), in my 1944 machine was a Fafnir 205KLD.
 








 
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