Inspection of Major Parts
1)Inspection of Input Shaft Unit
Check whether there are such phenomena as tooth breakage,tooth flank fatigue pitting,wear of tooth surface and seizing of tooth surface,and if any of those appears,replace the input shaft immediately.
Check whether the spline of input shaft is seriously worn or damaged,if yes,replace the input shaft immediately.
Feel with hand whether the shaft rotates flexibly and whether there is clamping stagnation,if yes,replace the bearing immediately.
2)Inspection of Middle Shaft Unit
Check whether there are such phenomena as tooth breakage,tooth flank fatigue pitting,wear of tooth surface and seizing of tooth surface,and if any of those appears,replace the middle shaft immediately.
Note:Inner ring of middle shaft right bearing can’t be dismantled,and if middle shaft or inner ring of middle shaft right bearing needs to be replaced,then two parts need to be replaced together.
Feel with hand whether the bearing rotates flexibly and whether there is clamping stagnation,if yes,replace the bearing immediately.
3)Inspection of Main Shaft Unit
Check whether there are such phenomena as tooth breakage,tooth flank fatigue pitting,wear of tooth surface and seizing of tooth surface,and if any of those appears,replace the main shaft immediately.
Feel with hand whether the bearing rotates flexibly and whether there is clamping stagnation,if yes,replace the bearing immediately.
4)Inspection of Gear and Synchronizer Tooth Ring
Put the synchronizer tooth ring against the matched gear cone surface and check the clearance between the gear combination tooth and tooth ring,as shown in Fig.5.15,and the specific requirements are shown in the table 5.5.If the clearance has reached or exceeded the extreme value,replace the parts immediately.
Table 5.5 Clearance Between Gear Combination Tooth and Tooth Ring Terminal Face(https://www.daowen.com)
Fig.5.15 Inspection Method of Tooth Ring Terminal Face Clearance
5)Inspection of Clearance Between Synchronizer Unit Ring Terminal Face
Check the sliding flexibility of synchronizer unit,as shown in Fig.5.16.If there is clamping stagnation,repair or replace it.To correctly judge whether the parts need replacing,you must check the terminal face clearance between shifting fork and synchronizer combination sleeve:1)Use the feeler gauge to check the clearance between shifting fork and synchronizer combination sleeve,as shown in Fig.5.17,if the value exceeds the extreme value 1.0mm,replace the part.
Fig.5.16 Inspection Method of Synchronizer Sliding Flexibility
Fig.5.17 Inspection of Fork Terminal Face Clearance
6)Inspection of Transmission Shaft
Check the shafts visually and there should be no cracks,no serious wearing of shaft diameter and spline,or no broken tooth and serious wear of gear tooth.Otherwise,replace it.Check the radical circle run-out of the shaft,as shown in Fig.5.18.When the length of the shaft is 120～250 mm,the radical circle run-out of middle part shouldn’t exceed 0.03 mm and when the length of the shaft is 250～400 mm,the radical circle run-out of middle part shouldn’t exceed 0.06 mm.Otherwise,replace it.
Fig.5.18 Inspection Method of Transmission Shaft
The wearing degree of the shaft is usually expressed by roundness and cylindricity.Roundness error refers to the wearing unevenness of the same section and the half of the differential value between the maximum diameter and the minimum diameter measured in different directions on the same cross-section is used as the roundness error.Cylindricity error refers to the wearing unevenness of the axial section of shaft line and the half of the differential value between the maximum diameter and the minimum diameter measured in any direction on the measured shaft surface is used as the cylindricity error.Where the roller bearing is installed,the extreme value is 0.07mm,and where the inner ring of roller bearing is installed,the extreme value is 0.02mm.Otherwise,replace it.