GB/T 24659.1-2009Agricultural crawler tractors - Track idler - Requirement (English PDF)

3.1

guide wheel shall comply with the provisions of this section and procedures approved by the drawings and technical documents of products manufactured in accordance with prescribed.

3.2

material recommended ZG310-570 or ZG45Mn manufacture, to ensure the strength and life conditions, allow the use of other brands s material.

3.3

heat treatment Hardness.

a) ZG310-570. 156HB ~ 229HB;

b) ZG45Mn. 229HB ~ 269HB.

3.4

rim working surface for mating bore axis radial runout and rim guide with end face bore axis End Circular runout is not greater than the wheel

Margin of 0.5% of the nominal diameter.

3.5

pairs of guide rollers mounted integral rolling bearing seat hole, the shape and position tolerances, surface roughness shall comply with the requirements in Table 1.

Table 1

Surface of the cylindrical hole of each seat beat the common axis of each housing bore surface roughness its

Is not greater than the housing bore diameter tolerance of 1/2 <=0.05mm R Rao 3.2µm 3.6 casting does not indicate the size of tolerance should not be less than GB/T 6414-1999 level of CT10.

Quality tolerances shall not be less than 3.7 GB/T 11351-1989 provisions MT10 level.

3.8

machined surface should be smooth, there should be no damage, cracks and other defects.

3.9

gate, riser residual burrs and should be cleared to product drawings or technical documents specified size range, non-processing cavity surface should be thoroughly

Sand.

Slight defect 3.10 non-machined surface and allow repair of casting defects, the type, size, number and location of the product design requirements.

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