Heavy Duty Forklift
How to repair the drive axle housing of forklift?

Mar, 2022

The drive axle housing of the forklift is firmly installed on the frame of the forklift. Due to the rigid connection between the drive axle and the frame, the drive axle will bear most of the weight when forklift forks or carries and stacks goods. In addition, when the road is uneven and the fork load is uneven. In this way, the drive axle will be bent and broken, the bearing hole of the half shaft sleeve and the Journal of the half shaft sleeve will be worn.

1. Inspection and repair of forklift drive axle housing bending

1) Inspection of drive axle housing bending. Before inspection, first correct the flatness of the half shaft and the plane contact flange at the hub end to eliminate the end face circular runout error, then install the standard half shaft on the drive axle housing, calibrate the bearing, and test the center position of the left and right half shafts from the housing to judge whether there is bending. The difference between the two axes shall not be greater than 0.75mm.

2) When the bending of the drive axle housing exceeds the limit, it shall be corrected. During correction, the correction deformation shall not be greater than the original bending deformation, and the correction pressure shall be maintained for a period of time to make the axle housing obtain certain plastic deformation. If the deformation is too large and the bending deformation is greater than 2mm, it can be corrected after preheating, but the heating temperature is not allowed to exceed 700 ℃. The cast axle housing should preferably avoid heat correction.

2. Repair of broken forklift drive axle housing:
The crack in the middle of the drive axle housing and the crack on the flange can be repaired by welding. The key points of operation are as follows:

1) Make a 90° V-shaped groove along the crack, and its depth is 2/3 of the thickness.

2) Drill 5mm diameter holes 6-10mm from the two ends of the crack.

3) When repairing cracks by electric welding, the welding layer shall be higher than the base metal, but not more than 1mm. Repair welding shall be carried out on the reverse side after the front side is welded, and the weld shall be leveled after welding. If the welding repair is on the working plane, the flatness error shall not be greater than 0.25mm.

4) After the crack is repaired by welding, the reinforced web shall be welded at the crack, with a thickness of 4-6mm. The reinforced web shall be symmetrical with the center of the drive axle housing.

5) If the crack penetrates to the drive axle housing cover or the flange plane of the main reducer, the reinforcing web ring shall be welded after repair welding. The reinforcing web ring on the plane of the drive axle housing cover can be reconnected on the outside, and the main reducer housing should be reconnected on the inner surface depending on the permission of the internal space. When welding the reinforcing web ring, the reinforcing web ring shall be tightly pressed on the plane with bolts to avoid position movement and deflection during welding.

6) For the welded and strengthened drive axle housing, the straightness error and the flatness error of the housing cover surface and the flange plane of the main reducer shall be re inspected, corrected and polished to meet the standard.

3. Inspection and repair of other parts:
1) The coaxiality error of inner and outer bearing journals at both ends of the axle housing shall not be greater than 0.01mm; The perpendicularity error between the bearing journal and its thrust end face shall not be greater than 0.05mm; The bearing seat neck shall be perpendicular to the flange plane of the brake base plate, and the Perpendicularity Error shall not be greater than 0.1mm.

2) The thread damage of the screw hole shall not be more than 2 threads. If it exceeds the limit, it can be repaired by inserting a screw sleeve or welding.
3) When the wear of oil seal journal is greater than 0.15mm, it can be repaired by inserting sleeve.
4) When the wear of the Journal of the half shaft sleeve mounted rolling bearing is greater than 0.04mm, it can be repaired by chromium plating or surfacing.
5) The axle shaft sleeve shall be replaced if there are cracks and defects of any nature.
6) The wear of the inner and outer end seat holes of the axle shaft sleeve installed on the drive axle housing shall not be greater than 0.06mm, otherwise the axle shaft sleeve journal can be chrome plated or expanded to the repair size.
7) Replace the drive axle housing when it is broken.

SLD forkliftis located in Quanzhou City,Fujian Province. Founded in 2007, the company has a vehicle test site, R & D center, marketing center and forklift training base. Committed to independent development and innovation, R & D, production and sales of all kinds of forklifts and container handling equipments, the company follows the enterprise spirit of "excellent quality leading all the way", adheres to the quality concept of "quality creates trust", provides high-quality products to serve customers.

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