1. DRIVING & TRAILING
(G.W.R. type or equiv. with round nut)

1.1 Fit backing washer over smaller diameter of crankpin tube up to shoulder.

1.2 Fit projecting small diameter backing washer and crankpin tube assembly into crankpin hole in front face of driving wheel and push home.

1.3 Fit 14 BA screw from back of wheel turning fully home with screw driver. (screw will 'self tap')

1.4 Assemble coupling rod over large diameter of crankpin tube projecting from front face of wheel.

1.5 Screw nut on thread projecting from hole in crankpin tube. (see fig. to ensure this is fitted the correct way round). Tighten and then remove surplus thread from outer face with side cutters.

1. 14B.A. Screw.
2. Backing Washer.
3. Crankpin Tube.
   (i.e Short or Long version)
4. Round Nut.

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2. DRIVING & TRAILING
(L.M.S. type or equiv. with hexagon nut)

2.1 Follow steps 1.1 to 1.4 as previously detailed.

2.2 Place front washer over projecting thread.

2.3 Assemble 14 BA nut on projecting thread and tighten. Remove surplus thread with side cutters.

1. 14B.A. Screw.
2. Backing Washer.
3. Crankpin Tube.
   (i.e Short or Long version)
4. Front Washer.
5. 14BA Nut.

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3. LEADING

3.1 Assemble coupling rod to middle diameter of `combination crankpin tube and nut.

3.2 Fit backing washer to small diameter of 'crankpin tube nut' up to shoulder.

3.3 Fit projecting small diameter of 'combination crankpin tube/nut' and backing washer assembly into crankpin hole in front face of wheel and push home.

3.4 Fit 14B.A. screw from back of wheel turning fully home with screwdriver and tighten.

3.5 Any surplus thread projecting from outer face of 'combination crankpin tube/nut' should be removed with side cutters.

1. 14B.A. Screw.
2. Backing Washer.
3. Combination crankpin tube/nut

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4. NOTES

4.1 For use on locomotives with inside cylinders the trailing. i.e. short tube type should be used.

4.2 The preceeding assembly instructions describe the principle of assembly. However, if wheels have been first mounted on axles, then a slightly different sequence may be found beneficial.

5. AVAILABILITY OF CRANKPIN TYPES

Leading one type only
Driving (Long) round and hexagon
Trailing (Short) round and hexagon

6. MODIFICATION FOR OTHER MAKES OF WHEEL

The sketch opposite shows diameters of holes to be drilled to accommodate Ultrascale crankpins.

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