Floating-Bushing and Crown Bearing Driving Boxes, and Cellars
6167 and 6213 are equipped with 10" x 13" Crown Brasses in the Driving Boxes of axles #1, 3 & 4, and CNR's 12" x 13" Floating-Bushing Driving Boxes on Wheel #2. The Driving Box slides up and down
along the pedestals of the
frame, and the suspension bears down on top of the Driving Box transfering the weight of the locomotive to the wheels. Pressed inside the top of the box is a semi-circular brass bearing called a Crown Bearing that sits on the journal of the driving wheel. The journal is lubricated underneath by a Cellar which holds a grease cake (Hard Grease) and
presses it up against the Journal. Both 6167 and 6213 use Franklin Cellars on Axles #1, 3 & 4. On the side of the Driving Box
is a brass hub liner which is lubricated through the grease fittings located on the hub of the Driving Wheel Centre.
The Floating-Bushing Driving Box used on these engines is of a CNR
design. Within the Driving Box are two semicircular brass bearings that surround the entire journal. The brass bearings are not pressed into the driving box and are allowed to "float" and move around. These bearings are lubricated through several grease fittings located on the side of the box, between the Locomotive's Frame.
Preparing 6213's Driving Wheel Journals
Procedure For Pulling Out 6167's Cellars
6213's Driving Box with Cellar in place.
6213's Driving Box with Cellar removed, revealing Driving Wheel Journal
Franklin Automatic Driving Box Cellar
Cellar removed from one of 6213's Driving Box. The perforated plate was removed during the restoration in the 1980's.
All of the major components of a Franklin Cellar removed from 6167.
A grease cake covered in Franklin Perforated Plate. Note where the plate turned blue, probably from the journal heating up at some point.
The Wedge Adjuster Screw.
All the parts that go in to a Floating-Bushing Driving Box.
Floating-Bushing Driving Box detail drawing.
Looking down at one of the Floating-Bushing Driving Boxes on 6167's #2 axle.
Looking up at 6213's #2 axle equipped with Floating-Bushing Driving Boxes and Alco Lateral Motion Device
Looking up at one of the Floating-Bushing Driving Boxes on 6213's #2 axle. Maintenance Regulation No. 20
Driving Boxes
1. Crown Brasses:
(a)Compostion: Crown Brasses will be made of hard bronze, to specification M-25.
(b)Limit of wear: The limit of reboring crown brasses, at general repairs, Classes 1 to 4, will be 1/4" less than
original thickness at the crown.
Any brasses which cannot be bored to give this minimum thickness will be renewed.
At Nos. 5 and 6 repairs, crown brasses may be bored until the crown is 1/2" less than original thickness.
2. Machining Boxes And Fitting Brasses:
Driving boxes must be accurately machined for crown brasses, and brasses must be carefully fitted so that they will have bearing on the full length of the crown and on the toes, and must not be so tight as to cause undue springing of the box when pressed in. Brasses which spring the box more than 1/16" at the bottom must be removed and refitted.
3. Planing Boxes:
Driving boxes are to be planed on shoe and wedge faces, and for cellar or spreader fits, after crown brasses have been applied. Faces are to be parallel and both boxes on same axle to be the same width.
4. Seating Pressures:
The pressures to be used for putting in crown brasses must be within the limits shown below:
Diameter of Journal Cast Iron Cast Steel
Under 7-1/2" 10 - 12 tons -
7-1/2" to 8" 12 - 15 " 15 - 20 Tons
8" to 8-1/2" 15 - 20 " 20 - 25 "
8-1/2" to 9 1/2" -- 20 - 25 "
9-1/2" to 10" -- 25 - 30 "
Over 10" -- 30 - 35 "
5. Securing Driving Brasses:
Driving Box crown brasses are to be secured in the boxes by parallel plugs of
hollow staybolt steel 1" diam. These plugs will be a driving fit in the box and brass and will be secured in place by spot-welding the plugs to the top of the box. Two plugs will be used for ordinary boxes and four plugs for extended main boxes, located 2" off the center line of the box in accordance with Drawing No. 2H-18380.
6. Boring Brasses For Journal Fits:
The method of boring driving box brasses for journal fits is as shown on drawing 3H-15201. All main driving box brasses must be fitted to the journals by hand after boring.
All other driving brasses to be bored 1/64" larger than the journal.
7. Shoe And Wedge Fits:
Shoe and wedge faces will have bronze liners applied by electric welding in accordance with drawing 3H-14704. Such liners must be renewed when worn so that they will not finish up to within 3/8" of original face to face dimension.
In machining shoe and wedge faces, the faces are to be maintained an equal distance from the centre of the journal.
8. Hub Faces - Brass:
Brass hub face liners will be applied to boxes as shown on Drawing 3H-10330,
except on classes shown on Drawing 3H-16602.
Liners are not to be more than 1/2" thick when new, and to be replaced when worn 3/16" less than original distance from center line of box to hub face.
9. Cellar Pin Holes:
When cellar pin holes in the driving box lugs are found to be elongated 1/16" over standard at back shop repairs, they are to be restored to standard diameter by welding and drilling.
Note: For application and maintenance of Driving Box Cellars and Spreaders, see M.R. 48.
10. Lubrication:
Grease grooves in crown brasses to be in accordance with Drawing 3H-15201.
Oil holes for shoe and wedge face lubrication to be drilled as per drawing No. 3H15201.
For journal lubrication see also Maintenance Regulation No.48 in connection with cellars and perforated plates.
11. Machining:
Floating bush driving boxes must be made up in strict accordance with the detail drawings for each class of engine.
12. Finish:
The outer bushing, or where no bushing is used, the journal box itself must be smoothly and accurately machined or ground in the inner surface, and the floating bushing burnished on inner and outer surfaces.
13. Bolts:
The top and bottom sections of the box must be bolted together with
special high tensile steel bolts.
14. Standard Clearances:
The standard clearances for floating bushings on new work or when bushings are renewed are as follows:-
(a)Between journal and inside of floating bush, from 0.005" to 0.010" measured on diameter before splitting bronze bush.
(b)Between inside of iron bushing and outside of floating bushing, or, in cases where no cast iron bushings are used, between the inside of the box and the outside of the floating bushing, from 0.026"and 0.036" (1/32" nominal) measured on the diameter before splitting
bronze bush.
Note: Original dimensions and tolerances are detailed on Drawing 2H-18467 and individual box drawings.
15. Limits Of Wear:
(a)Cast iron Bushings or Steel Boxes:
The limit of internal wear for cast iron bushings is 1/8" greater than the original
diameter.
The limit of internal wear for steel driving boxes is 1/4" greater than original diameter.
In the event single bush driving boxes to Drawings 4H-17183 and 4H 24615 are worn more than 1/4" greater than original bore, same may be reconditioned by application of liner welded in place as per Drawing 3H-29774.
(b)Hub Liners:
Hub liners must be renewed if worn 5/16" below the original dimension, and must in all cases be applied by electric welding as shown on Drawing 3H-10330.
(c)Shoe and Wedge faces:
When shoe and wedge faces are worn so that they will not finish up to within 3/8" of the original face to face dimensions, steel liners will be applied to restore the box to standard dimensions as shown on Drawing 2H-17824.
16. General:
At all shoppings, No. 5 or better, floating bush driving boxes are to be reconditioned and standard
clearances restored as specified in Paragraph 14.
It is desired to confine the renewal of floating bushings to Back Shops only as a general practice, and this work should be done at Roundhouses only in cases of emergency.
Maintenance Regulation No. 48
Driving Box Cellars and Spreaders
1. Cellars:
Cellars for driving boxes are to be of a design suitable for the use of Franklin Perforated Plates.
Cellars, where no spreaders are used, are to be machined to a tap fit in driving boxes.
When holes for cellar pins are found to be elongated 1/16" over standard diameter at back shop repairs, they are to be restored to standard diameter by welding and drilling.
The standard clearance between the driving journal and the wall of driving box cellar next to the hub is 1/8". At back shop repairs when this distance exceeds 3/8", the cellar is to be built up by bronze welding and fitted to restore the standard
clearance of 1/8".
2. Spreaders:
Spreaders are applied to classes as called for on individual drawings. Spreaders to be machined to a tap fit in driving boxes.
When holes for cellar pins are found to be elongated 1/16" over standard diameter at back shop repairs, they are to be restored to standard diameter by welding and drilling.
3. Cellar Pins:
For dimensions of cellar pins, and references for cotters, see Drawing 4H-14852.
On driving boxes equipped with Franklin spreaders, the spreaders, bolts and pins must be in accordance with Franklin Drawing C-43346.
4. Franklin Details:
Types of perforated and follower plates, end plates and springs to be used, are shown on Franklin Drawing BS-2198, and parts for renewals must be ordered to this drawing quoting the line number applicable to the class of locomotive concerned.
Tension of springs must be as shown on Franklin Drawing A-4908.
Perforated plates must be fitted to the particular journal to which they will apply, making sure that the centre of the perforated plate is just clear of the journal, when resting on same with its own weight. This will insure a good bearings when spring tension pressure forces plate against journal. No hammering of any kind to be done on perforated plates except with a wooden mallet.
All turn-over edges must turn inward to prevent catching or jambing in cellar. Whenever a part of the turned-over edge is broken off the burr must be filed off far enough back to clear the journal or cellar walls.
After engines are lifted with overhead crane, check
must be made of cellars to make certain that springs have forced the perforated plates against the journals.
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