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Complete List on Monarch 10EE Bearings and Known replacements.

GrantGunderson

Hot Rolled
Joined
Jun 4, 2021
Location
Bellingham, WA
During the course of my 10EE complete teardown, I have complied a full list of all of the bearings in my 1944 Round Dial and from what I have researched are compatible modern replacements. It will be interesting to compile a list of the bearings in other years, and a list of what people have successfully used as replacements. If you have any bearings different than what is here, please post, and I will modify the spread sheet.

Excel Sheet of 10EE Bearings / parts.

Here is a link to a 1944 New Departure Catalog that Cal sent me.

In my research, I hand found that New Departure specifically marked any Bearings destined for precision use, such as in a spindle with the amount of Eccentricity, and the high spot. I believe these are the "Check marks" you see on some of the bearings, as well as the ##XX numbers as well. These all appear to be hand etched on the bearings.

ND Numbering System:
Reading Right to Left:

First two digits is the bore size

Third digit is Series, 2 = Light, 3 = Medium, 4 = Heavy, 5 = Non Loading groove light, 6 = Non Loading Groove heavy.

Fourth Digit, 1 = single row maximum capacity, 3 = Single Row non loading grove, 5 = double row, 7 = shielded, 8 = ND Seal Type

Here are a few of New Departure's bearing prefixes and subfixes.
A = Rust prevention compound
BA = Single Row Angular Contact, Singly Mounted
BC= Single Row Radial, Non-Loading Grove Assembly
BD=Double Row Angular Contact
BL=Single Row Radial, Loading Groove Assembly
BM = Single Row Separable Bearings (Magneto)
BIC = Single Row Radial, Non-Loading Groove to inch sizes.
C= sheilds on one side. or High melting point grease
D= Duplex pair
DB = Duplex front to Back
DF = Duplex Face to Face
DT= Duplex Thrust
DU=Duplex Universal
F = Single Row Angular Contact, Duplex
G = Snap Ring
L = Loose or can be Standard preload
M = ?
N = Flanged type = Modern equivalent is NR
P = Sheilds on one side
PP = Shields on both sides
Q= non metallic seperator
R series = inch series
S= Special
T= Universal Ground or Can be tighter fit. or can be Heavy preload
V= ?
W = ?
X= medium preload or standard Internal fit-up
Y= low speed noise tested
20 series = Angular contact light series (most companies is a 7 series)
30 series = Angular contact Heavy series.
4XXXX or 4XXX = Snap Ring
47XXXX or 47XXX = Snap Ring and Shield
7XXX or 7XXX = Shielded on one side.
77XXX or 77XXXX = Shielded on both sides.
8XXX = Sheilded standard width
87XXX = Shielded and Sealed wider than standard bearing
88XXX = Shielded, sealed and lubricated for (life)
WC-8XXX = Outer Ring width is equal to over width of standard 8XXX series
WC-8XXX = Shielded with wider center race.
WC - series was designed to be mounted into softer metals

1,3,5 prefix is ABEC
 
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GrantGunderson

Hot Rolled
Joined
Jun 4, 2021
Location
Bellingham, WA
Head Stock Bearings

NOTE: I believe that the factory tried to match the amount of eccentricity with the front duplex and the rear spindle bearing. Mine where all 12XX with the exception of the front of the duplex having been previously replaced and it was a 13XX. I am curious if that holds true for others.

Front of Duplex.
"N"2012 "DB-T" / NM2012. OD 10mm, ID 60mm, 22mm Thick. Flanged, flange is 116mm. Has "M" crossed out from NM2012. Duplex, type DB-T, 15 balls 19/32, radius 0.6 ABEC 5 or 7
IMG_0343.jpeg
Rear of Duplex.

2012 - V- OD 110mm, ID 60mm, 22mm Thick. No Flange. Duplex, type DB-T, 15 balls 19/32, radius 0.6 ABEC 5 or 7
rearoffrontduplex.jpeg
Rear Spindle Bearing
New Departure R 5210 has 12XX and a check mark on it.
ND Catalog: 50mm Bore, 90mm diameter, 30.2mm width, 7/16” balls, 16. Per row radius .04 Double row angular contact R is high load capacity.
The checks mark the highpoint and the 12XX is the amount of eccentricity.
RearSpindle.jpeg
Headstock Reverse shaft oil Seal
Victor 60250 oil seal
Replacement : AVX #TC25x44.5x6.
Headstock  Reverse shaft oil Seal.jpeg
rear reverse bearing was a loose slip fit on the reverse shaft. Its a New Departure 5205D. its 52mm OD and 25MM ID X 20.57mm thick. Replacement New Departure 5205D.ND W0256848
rear reverse bearing .jpeg
Front Reverse Shaft Bearing New Departure 3204 bearing, but there is a 4 scratched in front of that number. OD 47mm, ID 20mm, 14mm thick, has snap ping I believe this signifies it has a snapping on it Replacement is New Departure 43204.ND W0256848
Front Reverse Shaft Bearing.jpeg
Idler Gear bearing is a New Departure 3205 WT. OD52mm, ID25mm , 15mm Thick, T= tighter internal fit. Does anyone know what the W designation is for?
Idler Gear bearing.jpeg
The tachometer splash gear uses the same gear as the reverse idler gear. is a New Departure 3205 WT. OD52mm, ID25mm , 15mm Thick, T= tighter internal fit. Does anyone know what the W designation is for?
The tachometer splash gear .jpeg
 

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GrantGunderson

Hot Rolled
Joined
Jun 4, 2021
Location
Bellingham, WA
Gear Box Bearings

Feed Rod Plate

It uses two New Departure C8503 Bearings. 40mm OD, 17mm ID, Race is 12mm thick, center is 14mm thick. Shielded on one side.
Feed Rod Plate.jpeg
Feed Rod Plate Oil Seal Victor 60318 Evidently a Federal-Mogul Encased Seal 470045 50045S 60318 H296 00044 5330001790861 is a cross reference for it
Feed Rod Plate Oil Seal .jpeg
Tumbler Gear New Departure 3201 Bearing 32mm OD, 12mm ID, 10mm Thick.
Tumbler Gear.jpeg
Screw Shaft, Left


New Departure "PN" 20205 Bearing 52mm OD, 25mm ID, 15mm Thick.
Screw Shaft, Left.jpeg
Screw Shaft Right , open Bearing OD47mm, ID 17mm, 14mm thick, Flanged.
Screw Shaft Right.jpeg
Screw Shaft Right2.jpeg
Cone Gear shaft Right Hand bearing is a New Departure 3204. 47mm OD, 20mm ID, 14mm thick.
Cone Gear shaft Right Hand bearing.jpg
Left hand Cone Gear Shaft bearing out of the Gear Box. It is a New Departure C8504 Bearing. 47mm OD, 20mm ID, 14mm thick race, center is 15.27mm thick. Shielded one side.
Left hand Cone Gear Shaft bearing .jpg
The Clutch Gear Shaft uses 2, New Departure 3204 Bearings. 47mm OD, 20mm ID, 14mm thick.
The Clutch Gear Shaft.jpg
The Tumbler Shaft also uses a New Departure 3204 Bearing. 47mm OD, 20mm ID, 14mm thick.
Tumbler Shaft.jpg
 

GrantGunderson

Hot Rolled
Joined
Jun 4, 2021
Location
Bellingham, WA
Change Gear Stud

Uses New Departure C8505 Bearing. It is shielded on one side. 52mm OD, 25mm ID, 15mm thick,
Change Gear Stud.jpeg
Also uses New Departure NM0205B bearing. It is unshielded and has a step collar on it. It has a “211” engraved on the back. 52mm OD, 25mm ID, 15mm thick. Center is 17mm thick.
changegearstud2.jpeg
changegearstud3.jpeg
Feed Shaft
End gear side uses a New Departure ????? Bearing that is shielded on one side. 47mm OD, 20mm ID, Race is 14mm thick, center is 15.28mm thick.
Feed Shaft End gear side.jpeg
Feed Gear Shaft Gearbox side uses a New Departure 3204 bearing. Must be open unshielded. 47mm OD, 20mm ID, 14mm Thick.
Feed Gear Shaft Gearbox side.jpeg
 

GrantGunderson

Hot Rolled
Joined
Jun 4, 2021
Location
Bellingham, WA
APRON

Take up bearings for Saddle / Apron

FAG 629-C-2HRS-L038

Apron Rack Pinon Bearing (front and rear)


New Departure C 88505 47mm OD, 20mm ID, 14mm thick at race, 17.71mm thick at center. Shielded both sides.
Apron Rack Pinon Bearing  (front and rear).jpg
Friction Lever Assemblies:
Each uses two Thrust Bearings, 0.435” thick, 1.187” OD, ID 0.50” / 0.5635”
Friction Lever1.jpeg
Friction Lever2.jpeg
and one Inner Thrust bearing, 0.2540” thick, 0.8700” OD, 0.500”ID
Inner Thrust bearing.jpeg
Inner Thrust bearing2.jpeg
The hand wheel / Oil pump cam uses two New Departure C88503 Bearings. 40mm OD, 17mm ID, Race is 12mm thick, center is 16.57mm thick. Shielded both sides.
The hand wheel : Oil pump cam.jpg
Apron Feed Reverse / Worm Wheel shaft
Uses two New Departure C88504 47mm OD, 20mm ID, Race is 14mm thick, center is 17.72mm thick Shielded both sides.
Apron Feed Reverse : Worm Wheel shaft.jpg
Worm gear
Uses two Thrust bearings. .5580” / 14.2mm thick, 1.4685” / 37.31mm OD, .75” ID.
Worm gear.jpeg
 

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GrantGunderson

Hot Rolled
Joined
Jun 4, 2021
Location
Bellingham, WA
End Gear
Quadrant gears each use two C487505V bearings. These are shielded on both sides and have a snap ring. 52mm OD, 25mm ID, 15mm Thick. 4 total bearings.
End Gear.jpeg
End Gear2.jpeg
Belt Tensioners


Each uses Two MRC 204FS2 bearings shielded on one side. 47mm OD, 20mm ID, 14mm thick, 15.25mm thick at center, Replacement is a 8504 Bearing. Or a 87504 fully shielded / or sealed.
Belt Tensioners.jpeg
Belt Tightener Pully
Uses Two New Departure 8503 Bearings, shielded on one side. 40mm OD, 17mm ID, 12mm thick at race, 14mm thick at center.
Belt Tightener Pully.jpeg
 

GrantGunderson

Hot Rolled
Joined
Jun 4, 2021
Location
Bellingham, WA
Motor / Generator Bearings.
MG Rear. FAG 6304-c-2hrs
MG Front SKF 6205 2RSJEM

Exciter uses Two SKF 6204 Z

DC Motor Output shaft DC Motor Output shaft
DC Motor Rear bell bend cover. MRC 309SFF
Backgear lower front sealed SKF 6209-2RS1NR/C3GJN
Backgear lower back open SKF 6209/C3
Backgear upper uses two SKS 6203-2RSJEM
 

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