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Dongfeng Liuzhou Motor Chenglong H7 1858GLPI Heavy-Duty Construction Dump Truck Hydraulic cylinder lifting bracket
Tipper Hydraulic Cylinder & Bracket System Overhaul BOM
| No. | Generic / OEM Part Name (EN) | Qty | Core Material & Technical Requirements | Maintenance & Replacement Recommendation |
|---|---|---|---|---|
| 1 | Cylinder Lower Bracket Assembly (Chassis Frame Seat) | 1 | ZG270-500 high-strength cast steel; features precision machined bore (typically 40/50mm). | Core item to be replaced. Check for casting blowholes, cracks, or severe out-of-roundness of the bore. |
| 2 | Cylinder Upper Bracket Assembly (Cargo Body Lifting Seat) | 1 | Inverted U-shape/triangular reinforced high-strength steel welded structure with swing clearance. | Core item to be replaced. Check the welding joints with the cargo front plate for fatigue cracking. |
| 3 | Cylinder Lower Trunnion Pin (Chassis Seat Pin Shaft) | 2 | 40Cr/45# steel with quenched & tempered hardening; surface precision ground. | Recommended replacement upon disassembly. Replace immediately if stepped or uneven wear is visible. |
| 4 | Cylinder Upper Ball Stud / Top Pin | 1 | Bearing steel or high-toughness alloy steel; withstands high shear stress. | Inspect the ball head for uneven wear or locking; replace immediately if excessive clearance is found. |
| 5 | Self-Lubricating Bushing for Bracket (Composite Bronze Bushing) | 1 Set | Bronze base with knurled inner wall / graphite lubricating particles or composite polyurethane. | High-frequency wearable item; mandatory replacement. Must press in a brand new bushing into the new bracket. |
| 6 | Mounting Bolt Set for Chassis Seat | 1 Set | Grade 10.9 or 12.9 reamed-hole high-strength bolts (typically M16-M20). | Mandatory replacement. Reusing old bolts after they have undergone tensile stress and elongation is strictly prohibited. |
| 7 | Bracket Self-Locking Nut & Thickened Washer | 1 Set | Integrated all-metal locking nut (with nylon ring or crimped anti-loosening design). | Replace with new ones along with the high-strength bolts. |
| 8 | Front-End Multi-Stage Hydraulic Cylinder Assembly | 1 | Special seamless steel tubes with chrome-plated surfaces; multi-stage telescopic design (e.g., Type 179/191). | Check cylinder sleeves for scratches, bending, or severe oil leaks. Seals (repair kits) can be replaced if only leaking. |
| 9 | Cylinder Multi-Stage Seal Kit (Oil Seals) | 1 Set | Imported polyurethane (PU) / fluorine rubber high-pressure V-shaped combination seals. | Disassemble and replace the full seal kit if the cylinder seeps oil or if the cargo box automatically drifts down. |
| 10 | High-Pressure Hydraulic Hose Assembly for Bracket | 1-2 | Steel wire braided ultra-high pressure hose (pressure resistance ≥ 32 MPa) with 90° crimped fittings. | Check outer rubber for aging, cracking, or friction damage against chassis. Add asbestos heat shielding if near GLPI gas lines. |
| 11 | Pin Shaft Retaining Locator / Locking Cotter Pin | 1 Set | High-elasticity spring steel / through-type split cotter pin. | Mandatory replacement. Prevents the pin shaft from slipping out during vehicle bumping, which causes roll-over. |
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