Adjustment Arm Solutions
Release time:
2024-03-22 16:25
Source:
One、Ⅱ Generation Self-adjusting Arm Installation Points
| labor step | Content of work | |
| 1 | Before installation, make sure that the brake air chamber actuator is in the unbraked state, and for the air chamber with spring parking brake (rear axle air chamber), the air pressure of the braking system should be maintained at 0.6MPa or above, so that the air chamber actuator is in the initial position. |  |
| 2 | After installing the adjusting arm on the camshaft, you need to make sure that the direction of the arrow mark on the adjusting arm housing should be the same as the direction of the air chamber pushrod pushout. |  |
| labor step | Content of work | |
| 3 | Fix the adjusting arm on the camshaft with shims and circlips, at this time, ensure that the axial clearance of the adjusting arm A = 0.50-2.00mm. |  |
| 4 | Ensure that the control arm can rotate freely relative to the adjusting arm housing. Use S12 wrench to rotate the adjusting arm adjusting hex head Note: electric wrench cannot be used), so that the hole on the adjusting arm is naturally aligned with the axle pin hole of the U-shaped fork of the air chamber actuator, and then easily insert the cylindrical pin into the U-shaped fork hole and lock the cotter pin. |
 |
| labor step | Content of work | |
| 5 | a. Push the control arm, push the control arm to the bracket mounting part, put the threaded locking pin into the control arm cable ring, and tighten the locking pin nut. b. Note: The control arm cable ring should not fall off during the installation process, otherwise the adjusting arm will not be able to adjust itself. |
 |
| labor step | Content of work | |
| 6 | Gap Adjustment： Use a wrench to turn the hexagonal head of the adjusting arm worm clockwise until the friction plate contacts the brake drum and then turn the hexagonal head of the worm counterclockwise 3/4 turn (you will hear a clicking sound when you rotate it in the opposite direction), apply the brake a number of times and the brake clearance will be automatically adjusted to the normal range, and this is the end of the installation process. Note: Electric and pneumatic wrenches cannot be used! |
 |
Seven、Common Failure Analysis
| Inspection and treatment of common problems of vehicles equipped with self-aligning arms | |||
| fault phenomenon | Cause of Failure | Inspection content | Treatment |
| Lunyi is hot and unusual | As the wheel and brake shoe cannot be separated properly and timely when the brake is released, the wheel and brake shoe rub abnormally, causing the wheel to become hot. | 1, check whether the brake air chamber push rod stroke meets the technical requirements (135 center distance as the standard, push rod stroke must be > 30m) | 1, if the brake air chamber can not meet the technical requirements, replace the brake air chamber. 2, the brake air chamber meets the requirements, indicating that the adjusting arm set gap is too small, replace the new self-adjusting arm. |
| 2, Check whether the brake air chamber return position is timely | 1,Check whether the links of each part are normal, whether there is a certain amount of inter-barrier between the self-adjusting buttocks and the air chamber fork, camshaft inside and outside the inter-barrier.2. Check whether the brake air circuit is bled in time.3. Whether the installation of the control arm has caused the serious deformation of the control arm.4. Check whether the brake shoes and camshafts are jammed, and whether the return spring meets the requirements. | ||
| 3, Whether the coaxiality and cylinder of the brake drum, brake shoe and brake roller meet the requirements. | Replacement or refurbishment to meet technical requirements | ||
| 4, Check if the brake return air circuit is normal | Check the return air line and give the sub to exclude the | ||
| 5, Self-adjusting buttocks are improperly installed or commissioned. | Reinstallation according to technical requirements | ||
| 6, Are the brake shoes or drums newly replaced and have not yet passed the break-in period? | You'll be fine after the break-in period. | ||
| 7, Braking too much (e.g. long descents in mountainous areas, etc.) | For now, the only way to cool it down is by drenching it with water | ||
| Vehicle brake runout | On the same axle, the vehicle braking runout is caused by different braking torques on the left and right. | 1, check whether the left and right brake air chamber push rod stroke meets the technical requirements (135 center distance as the standard, left and right stroke difference <8mm), whether the left and right brake air circuit is normal and whether the left and right brake rigidity is consistent. | 1. The left and right brake air chamber input air pressure must be the same. 2. The rigidity of the left and right brakes must be the same, and it is recommended to use the same product. |
| 2. Left and right brake shoe friction pads are of different quality and have different friction coefficients. | Use the same friction pads | ||
| 3, ABS is not synchronized, you can first disengage the ABS for braking test. | Replacement of ABS | ||
| 4, one side of the oil seal leakage, resulting in brake drums and shoes with oil. | Replace the shoes with new ones and clean the inner surface of the brake drums | ||
| 5, whether the left and right self-adjusting arms are products of the same manufacturer. | Replacement of self-aligning arms from the same manufacturer | ||
| 6,Self-adjusting arm has been invalidated, control bolts loose, slipping | Replace the failed part, refasten the control arm and install and commission as required. | ||
| 7. Improper installation and commissioning, resulting in inconsistent inter-barrier. | Reinstallation and commissioning in accordance with technical requirements | ||
| 8. Vehicle bias loading, resulting in unequal weights on the left and right wheels | Rearrangement of items | ||
| 9, The left tire air section is consistent. | Inflate so that the left and right tires have the same air pressure. | ||
| Vehicle brakes are weak | Weak braking due to excessive brake clearance or low braking force and locking torque of the self-adjusting arm not meeting technical requirements | 1. Whether the total stroke of the brake air chamber actuator is <60mm | Replace the brake air chamber with one that meets the technical requirements. |
| 2.Brake drums and shoes whether there is oil pollution | Replace the shoes with new ones and clean the inner surface of the brake drum. | ||
| 3. Whether the vehicle is overloaded | Used correctly as specified. | ||
| 4. Whether the self-adjusting arm is correctly installed and whether the control arm bolt is loose. | Install the self-adjusting arm correctly according to the technical requirements. | ||
| 5. Whether the brake air pressure is <0.6pa. | Maintain brake air pressure above >0.61pa. | ||
| 6, adjust the arm whether there is mixed load (manual and automatic mixed load or not the same self-adjusting arm) | Recommended to use the same adjusting arm | ||
| After driving for a while, I feel that the self-adjusting arm is working. | Not properly installed or self-adjusting arm failed | 1、Not correctly installed in accordance with the requirements, resulting in the self-adjusting arm can not work properly | Installation and commissioning from new in accordance with the technical requirements. |
| 2、The control arm bolts are loose, resulting in the self-adjusting arm not working properly. | Installation and commissioning from new in accordance with the technical requirements. | ||
| 3. The locking torque of the self-adjusting arm does not meet the technical requirements (counterclockwise locking torque <20N.m) | Replacement of new self-aligning arm | ||
Eight. Adjustment arm failure determination (self-adjusting arm)
| Serial No. | Part Name | Failure status | Failed photos | element |
| 1 | Self-aligning arm (visual inspection) | gauge |  |
visual assessment |
| Detection Methods | Visual inspection after cleaning out the dirt | |||
| Criteria for determination | 1) Cracks or breaks in the shell and control arm will lead to failure; 2) The connecting ring and the control arm can rotate relative to each other, it is judged that the control arm is slipping. 2) If the connecting ring and the control arm can rotate relative to each other, it is judged as the failure of the control arm slipping; 3) If the reinforcing ring and the connecting sleeve are severely worn, they will fail. 3) Failure if the reinforcing ring and connecting sleeve are severely worn; 4) Remove the adjusting arm assembly. 4) Remove the adjusting arm assembly. Rotate the control arm in clockwise direction until the limit position, then rotate it in counterclockwise direction, if the hexagonal head does not rotate, it will be invalid. |
| Serial No. | Part Name | Failure status | Failed photos | element |
| 1 | Self-aligning arm (torque detection) | gauge |  |
Torque wrench (0-100N.m), 12mm socket, vise. |
| Detection Methods | 1 Fix the self-adjusting arm casing on the vise; 2 in the turbine and shell connection to make a mark line with a torque wrench clockwise uniform speed rotation of the worm hexagonal head, to the turbine rotation of one week, record the value of torque; 3 in the hexagonal head of the worm and shell connection to do table mark line, with a torque wrench counterclockwise rotation of the worm rotation for a week (in the process of testing only allowed to self-adjusting arm worm counterclockwise rotation of a circle, otherwise it will cause damage to the self-adjusting arm of the internal parts), record the value of the torque |
|||
| Criteria for determination | Torque requirements: 0 Nm < clockwise < 13N.m, 18 Nm < counterclockwise < 50N.m. |
| Part classification | Serial No. | Detection factors | Detection Methods | Criteria for determination |
| self-adjusting arm | 1 | Adjusting brake clearance | Tighten the adjusting tube adjusting hex head fully clockwise, loosen it back 270 degrees counterclockwise (1.2-1.4mm of shoe drum clearance measured by a plug ruler), apply the brakes to the bottom of the brake 30 times in situ, and drive at 30km/h, apply the brakes to the bottom of the brake 5 times | / |
| 2 | Adjustment arm release | 1, in the adjusting arm shell and with the worm hexagonal head position with a white paint pen to mark the line; 2, no load or standard load road test 5-10km, road test process step on the brake (not less than 20 times), check the position of the marking line changes. |
1, if the road test and worm hexagonal head marking line position is unchanged, or along the clockwise direction of rotation (self-adjusting arm from the adjustment role), it meets the use requirements; 2. 2, If the marking line of the hexagonal head of the worm rotates in the counterclockwise direction after the road test, it will be judged to be invalid. |
|
| 3 | Brakes do not adjust automatically | 1, before the test drive in the dust cover on the lower observation hole position of the brake drum with a white paint pen marking attention to the upper and lower marking to be able to distinguish), measure the value of hoof drum clearance: upper A, lower C; 2, no load or standard load road test is not less than 10km, road test process step on the brake (not less than 20 times), after the test will be marked with white paint pen brake drum up and down position to the dust cover and the observation holes corresponding to the measurement of shoe drum clearance value: upper B lower D |
If B-A > 0.25mm or D-C > 0.25mm, it is judged to have failed. | |
| 4 | Bad brakes | Vehicle empty or standard load, in the asphalt road speed 30km/h, the brake is pressed to the end, measure the brake drag mark distance S1, speed 60km/h, the brake is pressed to the end to measure the brake drag mark distance S2. | Required braking distance S1: engine disengaged s11.4m meters; engine combined s13.2m meters S2: engine disengaged <36.7m meters; engine combined s43.8m meters |
AODI looks forward to cooperating with you
Contact
FAX: 0576-87286087
Mail: aodi@zjaodi.com
ADD:Automobile and Motorcycle Industrial Park, Yuhuan County, Zhejiang Province
Mobile terminal