Views: 2 Author: Site Editor Publish Time: 2021-09-22 Origin: Site
Front bridge in the fourth quarter
Adjust the front bridge
1. Adjust the axial preload of the main pin of the steering section
When the wheel falls into the ground, adjust it. After tightening the fastening nuts of the upper and lower bearings of the king sell, tighten the torque of 1 to 20 n.m to cause pre-tight load between steel balls and pointed thrust bowls. Then tighten the nut with 98n.m torque
2. Adjust the front wheel steering angle and toe
Adjust the limit screw on the steering gehe housing so that the maximum rotation angle of the front inner wheel is 37 °. By adjusting the tie rod, the toe length is 2 ~ 5mm.
3. Toe adjustment method:
1) First release the two lock bolts on the tensile rod adjustment sleeve.
2) Rotate the adjustment sleeve to make the toe value of 0 to 2 mm °. The specific measurement method is to draw a cross-crossing at the front and back crossing of the longitudinal center plane of the two front wheels, the same height as the center of the wheel, and measure the two front cross and two distances in the back and before and after The difference between the values is toes.
3) Tighten the lock bolt of the adjustment sleeve.
2. Common faults and troubleshooting front axles
1. Steering deviation: left and right tyre The air pressure is not equal, the difference is too large, so you should re-expand. The left and right hub bearings are inconsistent, and the spring U-bolts are rebounded and tightened.
2. Heavy-duty steering: Adjusting the steering section adjustment of the gasket is too tight, adjusting the toe as needed, adjusting the toe. Front axle deformation, correction or replacement. tyre The air pressure is insufficient and the expansion is required. The stroll pin compression spring adjustment is too tight, re-adjusting the king pin axial preload is incorrect, re-adjusting the pin thrust screw.
3. The front wheel is automatically returned: the inward and rearward tilt of the main pin do not meet the requirements, check whether the relevant components that affect the front wheel positioning are normal, and if necessary, replace the curved angle of the front wheel does not meet the requirements. Wang sales or bushing adjusts the front wheel hub bearings, moving parts lubrication, check and add oil.
4. The front wheel shines
The drive is unstable when the car is running at a speed or higher speed. Vehicle trembling and steering wheel also have \"beating hands \". This phenomenon is divided into low-speed shiny and high-speed flash. The low speed flash is mainly caused by the wear and tear of steering system components. Excessive; except for low speed, there is a wheel (including brake hub) imbalance, front wheel alignment, front wheel deformation and leaf spring displacement, etc., can be summarized as the following table:
Problem | Troubleshooting |
Large free rotation angle of the steering wheel | Check and adjust the steering drive shaft, steering gear clearance and steering wheel assembly |
Toes are not adjusted | Re-adjust toe to design requirements |
The adjustment of the front wheel hub bearing is incorrect | Redesign requirements |
Advantage of the front axle | Correct or replace |
The gap between the horizontal and straight belt pins is too loose. Tightening nut loose | Adjustment and replacement |
Knuckle King PIN and King PIN bearing gap are too big | Replace king or bushing |
The front leaf spring \\\\"u \\\\" bolts are loose, the left and right front leaf spring are different, the shock absorber is invalid | One way to check the tightening or replacement |
Unbalanced wheel (including brake drum) | Check and adjust or machine handling solutions |
Connection bolts and frames of steering gears | Fixed within the specified torque range |
The gap between the turning gear meshing transmission is too large or overwear | Re-adjust or replace |
This article is reprinted from the following: Dongfeng Truck Company Heavy Vehicle Factory - \\\"Military Dongfeng off-road vehicle Adjustment and Maintenance Manual \\\
