HOWO High quality Front Spring Rear Bracket WG9731520004

Description

SINOTRUK HOWO Front Spring Rear Bracket WG9731520004:

Front Spring Rear Bracket WG9731520004 is mainly used to connect the leaf spring with the vehicle frame. It is a key component of the vehicle suspension system. Its function is to fix the front leaf spring and ensure that the leaf spring can work stably during vehicle operation, while also bearing various forces from the leaf spring, such as vertical force, lateral force, and longitudinal force, which play a significant role in the vehicle’s driving stability and comfort.

How can one determine whether the Front Spring Rear Bracket WG9731520004 needs to be replaced?

To determine whether the Front Spring Rear Bracket WG9731520004 needs to be replaced, a comprehensive investigation should be conducted from multiple dimensions such as appearance damage, functional failure, and abnormal vehicle operation. The following are the specific judgment methods and standards:

1. Appearance and structural damage inspection Visible structural damage
Cracks and fractures:
Pay special attention to the stress concentration areas such as the main body of the bracket, the edge of the bolt holes, and the steel spring retaining slots. If cracks longer than 5mm (especially through cracks) occur, or local fractures (such as cracks at the corners of the retaining slot), it must be replaced immediately.
Example: If a protrusion at the connection point between the bracket and the frame shows a transverse crack, it may cause the bracket to fall off, which is a serious safety hazard.

Deformation and distortion:
Use a ruler to fit the installation surface of the bracket. If the gap exceeds 1.5mm (such as excessive flatness deviation of the bracket), or the bracket bends to one side (comparing the symmetry of the left and right brackets), it indicates deformation due to force, and replacement is necessary.

Front Spring Rear Bracket WG9731520004 Excessive wear:

If the wear depth of the wear-resistant liner in the steel spring retaining slot exceeds 2mm (measured with a depth gauge), or obvious grooves appear on the inner wall of the retaining slot (width exceeding 5mm), it will cause the spring to loosen, and the bracket needs to be replaced.
2. Connection part abnormalities
Wear of bolt holes:
Check the bolt holes that fix the steel spring. If the hole diameter exceeds the standard value (such as φ14mm) by more than 0.5mm (measured with a vernier caliper), or if the hole wall has burrs or notches, it indicates that the hole position has deformed due to long-term vibration, and replacement is necessary.

Crack at the welding joint:
If the bracket is of welded structure (such as the welding joint between the reinforcing ribs and the main body), if the weld seam is detached or cracked (length exceeding one-third of the total length of the weld seam), it must be replaced immediately to avoid a decrease in the bracket’s strength.

II. Function Failure and Abnormal Vehicle Behavior of the Front Spring Rear Bracket WG9731520004:

1. Suspension System Function Failure
Loose Leaf Spring:
Manually shake the front leaf spring (ensure the vehicle is stationary and safely supported), if the gap between the leaf spring and the bracket slot exceeds 3mm (standard gap ≤ 1mm), it indicates that the bracket slot is worn or deformed, unable to effectively fix the leaf spring, and replacement is required.
Reduced Shock Absorption Performance:

When the vehicle passes over uneven road surfaces, the suspension system emits louder noises (such as “clanging” sounds), or the vehicle body shakes more severely than usual, possibly due to the failure of the bracket causing the leaf spring to shift, affecting the shock absorption effect.

2. Abnormal Signs During Driving
Noise Characteristics:
Periodic “clanging, clanging” sounds occur during driving, especially when turning or passing over， the noise intensifies. This may be due to loose bracket bolts or worn bracket slots， causing the leaf spring to collide with the bracket.

Vehicle Deviation or Vibration：
During straight driving， the steering wheel deviates， or the front wheels exhibit abnormal oscillation (such as steering wheel shaking). Check if the bracket is deformed， causing the leaf spring positioning to be inaccurate， affecting the wheel alignment parameters.

III. Maintenance Cycle and Preventive Replacement of the Front Spring Rear Bracket WG9731520004:

1. Regular Inspection According to Operating Conditions
Routine Maintenance Inspection：
Every 50，000 kilometers or 6 months (whichever comes first)， during chassis maintenance， disassemble the bracket， clean and visually inspect， focusing on stress concentration areas (such as bracket corners， around bolt holes).

Shorten the Cycle for Harsh Conditions：
If the vehicle is driven on heavy loads and bumpy roads (such as construction sites， mines)， it is recommended to inspect once every 30，000 kilometers to avoid cumulative fatigue damage.

2. Combined with Vehicle Service Life
If the vehicle has traveled more than 150，000 kilometers， or the bracket has been used for more than 5 years (even if there is no obvious damage to the appearance)， due to metal fatigue， it is recommended to perform preventive replacement， especially for vehicles that have experienced severe bottoming out or collisions.

V. Emergency Replacement Scenarios
If the following situations occur， stop the vehicle for maintenance and replace the bracket immediately：
During driving， suddenly hear a “bang” sound from the chassis， accompanied by severe vehicle body shaking， which may be due to the fracture of the bracket causing the leaf spring to fall off；
Check and find that the bracket body is fractured， the bolt holes are completely open， or the leaf spring slot is severely deformed (such as the opening of the slot expanding by more than 10%)， at this point， the vehicle is no longer safe to drive and needs to be towed.