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An idler key for a track roller assembly is disclosed. The idler key may have a flange portion, and an elongated protrusion extending from the flange portion in a direction generally orthogonal to the flange portion. The idler key may also have at least one shoulder disposed between the flange porti

An idler key for a track roller assembly is disclosed. The idler key may have a flange portion, and an elongated protrusion extending from the flange portion in a direction generally orthogonal to the flange portion. The idler key may also have at least one shoulder disposed between the flange portion and a base of the elongated protrusion. The at least one shoulder may have at least one machined surface configured to transfer load to a mating component.

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1. An idler key for a track roller assembly having a yoke member and a frame, the idler key comprising: a flange portion configured to engage the frame;an elongated protrusion extending from the flange portion in a direction generally orthogonal to the flange portion and being configured to extend t

1. An idler key for a track roller assembly having a yoke member and a frame, the idler key comprising: a flange portion configured to engage the frame;an elongated protrusion extending from the flange portion in a direction generally orthogonal to the flange portion and being configured to extend through an opening in the frame and engage a lengthwise slot in the yoke member; andat least one shoulder disposed between the flange portion and a base of the elongated protrusion, the at least one shoulder having at least one machined surface configured to transfer load to at least one of the yoke member and the frame. 2. The idler key of claim 1, wherein the at least one shoulder includes: a first shoulder connected to the flange portion at the base of the elongated protrusion; anda second smaller shoulder located between the first shoulder and external surfaces of the elongated protrusion. 3. The idler key of claim 2, wherein: the first shoulder includes a machined outer surface; andthe second smaller shoulder includes a machined end surface. 4. The idler key of claim 1, wherein the elongated protrusion is located closer to a first side of the flange portion than to a second opposing side of the flange portion. 5. The idler key of claim 4, wherein the elongated protrusion is located closer to the first side of the flange portion by about 2-10 mm than to the second opposing side of the flange portion. 6. The idler key of claim 1, wherein a dimension of the elongated protrusion in a lengthwise direction is at least twice a dimension of the elongated protrusion in a transverse direction extending between the first and second sides of the flange portion. 7. The idler key of claim 1, wherein: a length of the elongated protrusion is about 150-200 mm;a width of the elongated protrusion is about 40-60 mm; anda depth of the elongated protrusion is about 50-70 mm. 8. The idler key of claim 1, wherein at least a portion of the elongated protrusion is hardened to a Rockwell hardness of about 30-40 C. 9. The idler key of claim 1, further including a plurality of holes passing through the flange portion on opposing sides of the elongated protrusion. 10. The idler key of claim 9, wherein the plurality of holes includes a first row of holes and a second row of holes disposed in a lengthwise direction of the flange portion. 11. The idler key of claim 1, wherein the flange portion includes: an internal surface from which the elongated protrusion extends, and an opposing external surface; anda recess disposed within the external surface at a base of the elongated protrusion. 12. The idler key of claim 11, further including at least one of part number identification and installation instructions provided within the recess. 13. The idler key of claim 1, wherein the idler key is made from cast iron. 14. The idler key of claim 13, wherein the elongated protrusion includes machined upper and lower surfaces that are generally parallel with first and second opposing lengthwise sides of the flange portion. 15. An idler key for a track roller assembly having a yoke member and a frame, the idler key comprising: a generally plate-like flange portion having a first centerplane of symmetry extending in a lengthwise direction and being configured to engage the frame; anda protrusion extending from the flange portion having a second centerplane of symmetry extending in the lengthwise direction of the flange portion and being configured to extend through, an opening in the frame and engage a lengthwise slot in the yoke member,wherein the first centerplane of symmetry is offset by an amount from the second centerplane of symmetry. 16. The idler key of claim 15, further including: a first row of holes passing through the flange portion and being oriented in the lengthwise direction of the flange portion; anda second row of holes passing through the flange portion and being spaced apart from and generally parallel with the first row of holes,wherein the protrusion is located between the first and second rows of holes. 17. The idler key of claim 16, wherein the offset amount is equal to about 2-10 mm. 18. The idler key of claim 16, wherein a dimension of the protrusion in the lengthwise direction of the flange portion is at least twice a dimension of the protrusion in a transverse direction extending between the first and second rows of holes. 19. The idler key of claim 15, wherein: a length of the protrusion is about 150-200 mm;a width of the protrusion is about 40-60 mm; anda depth of the protrusion is about 50-70 mm. 20. The idler key of claim 15, wherein at least a portion of the protrusion is hardened to a Rockwell hardness of about 30-40 C. 21. The idler key of claim 15, wherein the flange portion includes: an internal surface from which the protrusion extends, and an opposing external surface; anda recess within the external surface at a base of the protrusion. 22. The idler key of claim 21, further including at least one of part number identification and installation instructions provided within the recess. 23. The idler key of claim 15, further including: a first step connected to an internal surface of the flange portion; anda second smaller step located between the first step and external surfaces of the protrusion. 24. The idler key of claim 23, wherein: the first step includes machined side surfaces configured to engage and transfer load to the frame; andthe second smaller step includes a machined end surface configured to engage and transfer load to the yoke member. 25. The idler key of claim 23, further including: a first machined radius located at an intersection of the first step and the flange portion;a second machined radius located at an intersection of the second smaller step and the protrusion; anda third as-cast radius located at an intersection of the first and second smaller steps. 26. The idler key of claim 25, wherein: the first and second machined radiuses are about the same size; andthe third as-cast radius is larger than the first and second radiuses. 27. The idler key of claim 26, wherein: the first and second machined radiuses have a dimension of about 2-3 mm; andthe third as-cast radius has a dimension of about 8-12 mm. 28. The idler key of claim 15, further including chamfers located around a periphery of the protrusion at a distal end. 29. The idler key of claim 15, wherein the idler key is made from cast iron. 30. The idler key of claim 29, wherein at least an internal surface of the flange portion and upper and lower surfaces of the protrusion that are generally parallel with the second centerplane of symmetry are machined surfaces. 31. An idler key for a track roller assembly having a yoke member and a frame, the idler key comprising: a flange portion configured to engage the frame; andan elongated protrusion extending from the flange portion in a direction generally orthogonal to the flange portion and configured to extend through an opening in the frame and engage a lengthwise slot in the yoke member, wherein the elongated protrusion is located closer to a first side of the flange portion than to a second opposing side of the flange portion. 32. The idler key of claim 31, further including: a first plurality of holes located at the first side of the flange portion; anda second plurality of holes located at the second opposing side of the flange portion. 33. The idler key of claim 31, wherein the elongated protrusion is located closer to the first side of the flange portion by about 2-10 mm than to the second opposing side of the flange portion. 34. The idler key of claim 31, wherein at least a portion of the elongated protrusion is hardened to a Rockwell hardness of about 30-40 C. 35. The idler key of claim 31, wherein: the flange portion includes: an internal surface from which the elongated protrusion extends, and an opposing external surface;a recess within the external surface at a base of the elongated protrusion; andthe idler key further includes at least one of part number identification and installation instructions provided within the recess. 36. The idler key of claim 31, further including: a first step connected to an internal surface of the flange portion by a first machined radius;a second smaller step connected to the first step by a second as-cast radius and connected to external surfaces of the elongated protrusion by a third machined radius,wherein: the first step includes machined outer surfaces configured to engage and transfer load to the frame; andthe second smaller step includes a machined end surface configured to engage and transfer load to the yoke member. 37. The idler key of claim 31, wherein a dimension of the elongated protrusion in a lengthwise direction of the flange portion is at least twice a dimension of the elongated protrusion in a transverse direction extending between the first and second opposing sides of the flange portion. 38. The idler key of claim 37, wherein; a length of the elongated protrusion is about 150-200 mm;a width of the elongated protrusion is about 40-60 mm; anda depth of the elongated protrusion is about 50-70 mm. 39. The idler key of claim 31, wherein the idler key is made from cast iron. 40. The idler key of claim 39, wherein at least an internal surface of the flange portion and upper and lower surfaces of the elongated protrusion that are generally parallel with a lengthwise centerplane of symmetry are machined surfaces. 41. An idler key for a track roller assembly haying a yoke member and a frame, the idler key comprising: a flange portion configured to engage the frame;an elongated protrusion extending from the flange portion in a direction generally orthogonal to the flange portion and being configured to extend through an opening in the frame and engage a lengthwise slot in the yoke member, wherein the elongated protrusion includes upper and lower machined surfaces configured to engage and slide in a lengthwise direction of the elongated protrusion within corresponding portions of a slot in the yoke member. 42. The idler key of claim 41, wherein at least a portion of the elongated protrusion is hardened to a Rockwell hardness of about 30-40 C. 43. The idler key of claim 41, wherein: the flange portion includes: an internal surface from which the elongated protrusion extends, and an opposing external surface;a recess within the external surface at a base of the elongated protrusion; andthe idler key further includes at least one of part number identification and installation instructions provided within the recess. 44. The idler key of claim 41, wherein a dimension of the elongated protrusion in a lengthwise direction is at least twice a dimension of the elongated protrusion in a transverse direction extending between the first and second sides of the flange portion. 45. The idler key of claim 44, wherein: a length of the elongated protrusion is about 150-200 mm;a width of the elongated protrusion is about 40-60 mm; anda depth of the elongated protrusion is about 50-70 mm. 46. The idler key of claim 41, wherein the idler key is made from cast iron. 47. The idler key of claim 46, wherein at least an internal surface of the flange portion and upper and lower surfaces of the elongated protrusion that are generally parallel with a lengthwise centerplane of symmetry are machined surfaces. 48. The idler key of claim 41, further including: a first row of holes passing through the flange portion and being oriented in the lengthwise direction of the elongated protrusion; anda second row of holes passing through the flange portion, the second row of holes being spaced apart from and generally parallel with the first row of holes,wherein the elongated protrusion is located between the first and second rows of holes. 49. An idler key, comprising: a cast iron component having a plate-like flange portion, an elongated protrusion extending from a machined internal surface of the flange, a first step located at a base of the elongated protrusion, and a second smaller step located between the first step and external machined surfaces of the elongated protrusion,wherein: the external machined surfaces of the elongated protrusion include hardened upper and lower machined surfaces that are substantially parallel and extend in a length direction of the elongated protrusion;the flange portion includes a first row of fastener holes passing from an external surface through the machined internal surface at a location adjacent the upper machined surface of the elongated protrusion, and a second row of fastener holes passing from the external surface through the machined internal surface at a location adjacent the lower machined surface of the elongated protrusion;the first step includes machined outer surfaces;the second smaller step includes a machined end surface; andthe cast iron component is nonsymmetrical in a width direction.