Tow eyes - Transpec

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Tow eye bushes40mm Pt no. TB4840mm Pt no. TB48540mm Pt no. TB4940mm Pt no. TB49540mm Pt no. TB5050mm Pt no. TB60550mm Pt no. TB6150mm Pt no. TB615• Service maintenance programmes should includeregular toweye bush replacement- reducingmaintenance cost.From NZS5446:1987 Clause: 5.5• Towing eye bushes shall be replaced only inaccordance with the manufacturer’s instructions,and shall not be retained by welding.Pt no. 10990998• Wear guage for 40mm and 50mm couplingpin and toweye bush40mm Pt no. 40MMD50mm Pt no. 50MMD• Drift for toweye bush9
Wear and testing• Upon possible damage (deformation because of accident or overuse) thedrawbar eye must be changed immediately.• Damaged or loose bushes must be exchanged in good time.• The max. wear of the inner diameter of the drawbar eye (with nominaldiameter of 40 and 50mm) is 1.5mm when using bushes.• New bushes must be mounted professionally.• Welding of bushes is not allowed.• When using drawbar eyes without bushes the max. wear of the innerdiameter is 2.5mm.• The wear of the height of the drawbar eye must not exceed 2.5mm (applyingto all designs of construction).• The tightening torque of the interchangeable drawbar eye must be checkedat least with each inspection of the vehicle.• If necessary, lubricate coupling pin and tow eye bush with oil (greasecollects road debris and accelerates wear).“Generally parts with dynamic strength of more than 30mm thickness of steelquality ST 52-3, before welding should be normalised at approx. 900degrees C, for the process of welding at approx. 250 degrees C treated andafter welding at approx. 600 degrees C annealed for releasing stresses(normalising by the manufacturer/ preheat in the welding department/annealing for releasing stresses can be cancelled without lessening thestress capacities).On welding the drawbar eye on the drawbar, the shaft of the drawbar shouldbe pre-heated with neutral Oxy-Acetylene-Flame to approx. 250 degreessC.”NZS5446:1987 Clause: 5.7• Protection for the towing eye shall be included in the drawbar design toprevent ground contact of the towing eye. Spring type drawbar support isrecommended.10
Page 1: Tow eyesJune 2006Transport Specialt
Page 5 and 6: 50mm Weld-in tow eye(cont)Pt no. 10
Page 7 and 8: Flange mount tow eye(cont)40mm Bolt
Page 9: Interchangeable tow eye40mm Assy Pt
Page 13 and 14: Welding (cont)50mm weld-in tow eyeI
Page 15: Notes:14

Tow eyes - Transpec

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