How to detect the rear wheel brake of diesel four-wheel drive

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Practical Skills of Ford Roadwalker —— Tire Inspection, Four-wheel Alignment and Its Parameters

Old Gu is making a fire.

Old Gu is making a fire.

2020-0 1- 10 08:36

If the observed or reported problems have obvious reasons, they need to be corrected before going to the next step.

Check whether the tire is correct:

Tire pressure, tire size, speed class, load range, tire structure type.

Using any other size, load range or type of tire/wheel will seriously affect:

Driving, use, speedometer/odometer calibration, vehicle ground clearance, tire clearance between body and chassis, wheel bearing life and braking performance.

When the wheels meet the following conditions, new wheels need to be installed:

Bending, cracking, depression, serious corrosion, leakage, lengthening of hub bolt hole and excessive lateral or radial runout.

Only the tire size recommended in the tire label on the doorpost connected to the vehicle can be used.

Too large or too small tires will damage the vehicle and affect the durability, so it is necessary to modify the calibration of speedometer. Ensure that the wheel size and deviation meet the recommended requirements for using tires.

Check the tires for signs of uneven wear. The following description is used to identify the type of wear.

Check whether the tire has the following conditions: cut, hard object injury, friction injury, air bubble and insert.

Check the valve for the following conditions: cracks and cuts.

When damage is found or a new tire is installed, please install a new valve stem.

Normal tire wear

Normal tire wear refers to the wear of the whole tread. Because there are many factors that may affect tire wear (driving mode, road condition, vehicle type and tire model), it is impossible to tell the absolute mileage of normal wear. When the tread wears to the tread wear index layer, it can be considered that the tire has worn.

Abnormal tire wear/error

Abnormal tire wear/error refers to uneven tire wear around the tread or the whole tread, which leads to related performance problems. Abnormal tire wear/error may be caused by many factors, including driving mode (active and passive), climate (cold and hot) road conditions, vehicle load and maintenance (correct tire pressure, rotation interval and balance). Before repair, it is necessary to determine the root cause of vehicle wear. Tires showing abnormal/incorrect tire wear can still be used, but the minimum tread depth must be greater than and will not cause vehicle performance problems (noise/vibration).

Inner edge/shoulder wear

Wear of inner rim (inner tire shoulder) occurs at the inner rim of tire, which is usually caused by excessive camber and/or negative camber of front wheel. If the tread depth of the outer shoulder is at least 50% greater than that of the inner shoulder, the tire will have inner/inner shoulder wear. In order to determine whether the tire has such wear, please visually inspect the tire. Sometimes, it is necessary to measure the tread depth of each groove and compare it with the depth of shoulder.

Note: The picture shows the right front tire, others are similar.

Open Netease News to view wonderful pictures.

External edge/shoulder wear

Outer rim (or shoulder) wear occurs at the outer rim of the tire, which is usually caused by excessive camber and/or camber of the front wheel. If the tread depth of the inner tire shoulder is at least 50% greater than the tread depth of the outer tire shoulder, the tire will wear the outer tire shoulder. In order to determine whether the tire has such wear, please visually inspect the tire. Sometimes, it is necessary to measure the tread depth of each groove and compare it with the depth of shoulder.

Note: The picture shows the right front tire, others are similar.

Open Netease News to view wonderful pictures.

Open Netease News to view wonderful pictures.

Tilt/bottom wear

Tilt/bottom wear (also known as feathering wear) occurs on the inside, outside/shoulder of the tire. In order to determine whether the tire has such wear, please visually inspect the grooves on the inner and outer shoulders of the tire. Sometimes, it may be necessary to measure the tread depth difference between the front and rear edges of each flange in the inner and outer shoulder grooves.

Open Netease News to view wonderful pictures.

Inclined wear

Inclined wear diagonally spans the entire tread area and the entire circumference of the tire. To determine whether there is this kind of wear on the tire, please visually inspect the tire to determine whether the wear is inclined across the entire tread and the entire circumference of the tire. Sometimes, it may be necessary to measure the tread depth difference at the diagonal wear pattern.

The wheel alignment parameters in the user manual are inaccurate.

describe

JX6490P5

JX6490PA5

JX6490TA5

Front wheel alignment

camber angle

- 1 5' 25'

- 1 5' 25'

- 1 5' 25'

Caster angle of kingpin

3 42' 30'

3 42' 30'

3 42' 30'

(of cars) toe-in.

10' 2'

10' 2'

10' 2'

Rear wheel alignment

camber angle

- 1 35' 5'

- 1 35' 5'

- 1 35' 5'

(of cars) toe-in.

10' 2'

10' 2'

10' 2'

describe

JX649 1P5

JX649 1PA5

JX649 1TA5

Front wheel alignment

camber angle

- 1 5' 25'

- 1 5' 25'

- 1 5' 25'

Caster angle of kingpin

3 42' 30'

3 42' 30'

3 42' 30'

(of cars) toe-in.

10' 2'

10' 2'

10' 2'

Rear wheel alignment

camber angle

- 1 35' 5'

- 1 35' 5'

- 1 35' 5'

(of cars) toe-in.

10' 2'

10' 2'

10' 2'

Please refer to this parameter for the wheel alignment parameters assembled in the factory.

describe

JX6490P5

JX6490PA5

JX6490TA5

Front wheel alignment

camber angle

0.05 0.5

0.05 0.5

0.05 0.5

Caster angle of kingpin

3.2 1 0.6

3.2 1 0.6

3.2 1 0.6

(of cars) toe-in.

0.02 0. 15

0.02 0. 15

0.02 0. 15

Rear wheel alignment

camber angle

0 0.5

0 0.5

0 0.5

(of cars) toe-in.

0 0.3

0 0.3

0 0.3

describe

JX649 1P5

JX649 1PA5

JX649 1TA5

Front wheel alignment

camber angle

0.05 0.5

0.05 0.5

0.05 0.5

Caster angle of kingpin

3.2 1 0.6

3.2 1 0.6

3.2 1 0.6

(of cars) toe-in.

0.02 0. 15

0.02 0. 15

0.02 0. 15

Rear wheel alignment

camber angle

0 0.5

0 0.5

0 0.5

(of cars) toe-in.

0 0.3

0 0.3

0 0.3

Special statement: This article was uploaded and published by Netease from the author of the media platform "Netease" and only represents the author's point of view. Netease only provides information publishing platform.

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