Description
OEM-Quality Komatsu HD785-7 Suspension & Hydraulic Cylinders
Maintain smooth haul road ride quality, precise steering control, and rapid dump body cycle times with heavy-duty Komatsu HD785-7 Hydraulic Cylinders and Suspension Struts. Precision-engineered for Komatsu HD785-7 (100-ton payload class) mechanical haul trucks, this complete cylinder group includes oleo-pneumatic suspension struts, telescopic hoist cylinders, and hydraulic steering actuators designed to withstand severe pit shock loads and continuous high-pressure fluid cycles.
Key Cylinder Modules & Features
1. Front & Rear Oleo-Pneumatic Suspension Cylinders (Struts)
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Variable-Stroke Nitrogen-Over-Oil Damping: Absorbs severe haul road impacts and body-loading shocks from mining shovels, protecting the frame and tire casing.
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Independent MacPherson Strut Architecture (Front): Provides smooth wheel tracking and controlled axle articulation for high-speed haulage stability.
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Chrome-Plated High-Yield Piston Rods: Induction-hardened steel rods resist scoring, pitting, and silica dust abrasion.
2. Dump Body Hoist Cylinders
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Two-Stage Telescopic Design: Delivers fast raise and lower cycle times to dump up to 91.7 tonnes of material efficiently.
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Integrated Hydraulic Cushioning: Prevents mechanical shock when the body reaches maximum tilt angle and when returning to the chassis rest pads.
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Multi-Stage Polyurethane Seals: High-pressure U-cup seal packs prevent internal fluid bypass under full-load dumping angles.
3. Hydraulic Steering Cylinders
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Double-Acting Hydraulic Actuation: Delivers smooth, low-effort steering response across full steering lock angles.
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Heavy-Duty Spherical Bearing Ends: Precision-bored eye ends isolate steering linkage pins from torsional binding during haul road cornering.
Verified Technical Specifications
| Parameter | Specification |
| Compatible Machine Model | Komatsu HD785-7 Mining Haul Truck |
| Payload Capacity Class | 91.7 tonnes / 101 tons |
| Hydraulic Operating Pressure | 20.6 MPa (210 kg/cm² / 3,000 psi) |
| Front Suspension Cylinders | Oleo-Pneumatic Independent Struts (Qty 2) |
| Rear Suspension Cylinders | Oleo-Pneumatic Rear Axle Trailing Arm Struts (Qty 2) |
| Body Hoist Cylinders | 2-Stage Telescopic Double-Acting Cylinders (Qty 2) |
| Steering Cylinders | Double-Acting Hydraulic Struts (Qty 2) |
| Medium / Fluid Type | Nitrogen Gas Over ISO VG 46 / SAE 10W Hydraulic Oil |
