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SHACMAN F3000/M3000/X3000 Automatic Brake Slack Adjuster HD90129340257 / HD90129340258
Installation Location
Installed on the rear axle (second/middle axle) and the rear-rear axle (third/rear axle) of Shacman heavy-duty trucks (or other vehicle models equipped with Hande axles).
Mechanical Specifications and Design Parameters
1. Spline Details: Features a standard large-diameter involute spline bore-typically with 10 teeth-designed to fit directly onto the brake camshaft and capable of transmitting high torque.
2. Arm Length: The center-to-center distance is typically 165 mm; this standard dimension ensures that the brake chamber pushrod actuates the camshaft with an optimal leverage ratio.
3. Bolt Connection Hole: The pin hole for connecting the brake chamber pushrod clevis has a standard diameter of 14 mm (Φ14 mm).
Overhaul Bill of Materials (BOM)
| Category | No. | OEM Part Number | Part Name (English) | Quantity (Qty) | Overhaul & Replacement Recommendations |
|---|---|---|---|---|---|
| Core Actuation & Driving Assembly |
1 | HD90129340257 | Automatic Slack Adjuster - LH | 1 pc | Hande genuine part. Responsible for left-wheel clearance compensation. Do NOT reverse sides during installation. |
| ^ | 2 | HD90129340258 | Automatic Slack Adjuster - RH | 1 pc | Hande genuine part. Responsible for right-wheel clearance compensation. |
| ^ | 3 | DZ9100360040 | Rear Brake Chamber (T30/30) | 2 pcs | Dual-chamber power spring brake actuator. Replace in pairs if there is air leakage or weak pushrod actuation. |
| ^ | 4 | DZ91009340003 | Anchor Bracket & Pin Kit | 2 sets | Reference anchoring components to secure the control arm to the axle housing. Deformation or loss causes auto-adjust failure. |
| Transmission, Bearing & Sealing Assembly |
5 | HD90129340031 | Brake Camshaft - LH | 1 pc | 10-spline profile. Inspect spline wear and checking for any friction grooves/steps on the S-cam head during overhaul. |
| ^ | 6 | HD90129340032 | Brake Camshaft - RH | 1 pc | 10-spline profile. |
| ^ | 7 | DZ9112340062 | Camshaft Bushing | 4 pcs | Wear-resistant nylon or bronze bushings (2 per side). Excessive play causes severe brake shudder and must be replaced. |
| ^ | 8 | DZ9003320215 | Camshaft Oil Seal | 4 pcs | Blocks external mud/water and prevents axle gear oil from leaking into the brake drum. Mandatory replacement item. |
| ^ | 9 | - | Snap Ring & Shim Kit | 2 sets | Used to adjust the axial end-play of the camshaft (standard clearance should typically be maintained within 0.2 ~ 0.7 mm). |
| Friction & Brake Execution Assembly |
10 | HD90129340165 | Heavy-Duty Brake Lining (with Rivets) | 4 pcs | Total of 4 pieces per axle (including genuine rivets). High-friction, heavy-load material. Replace before reaching wear limits. |
| ^ | 11 | HD90129340005 | Brake Drum | 2 pcs | Heavy-duty gray cast iron drum. Inspect the inner surface for deep scoring, heat checking, cracks, or out-of-round conditions. |
| ^ | 12 | DZ9100340045 | Brake Shoe Return Spring | 4 pcs | High-tension return springs. Fatigued springs lead to delayed brake release, sluggish return, or brake dragging. |
| ^ | 13 | DZ9100340052 | Brake Roller Assembly | 4 pcs | Critical load-bearing rollers situated between the S-cam head and brake shoes. Replace immediately if pitted or seized. |
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