6 Inch Bore Scissor Hoist Kit for Dump Truck
Product Description
Product Detail
When a single-axle dump truck or heavy landscape dump body is loaded with 15 tons of wet river sand or broken concrete, the hydraulic hoist faces extreme static inertia at the very start of the dump cycle. At a flat zero-degree angle, the mechanical scissor arms have virtually zero upward leverage.
A 5-inch cylinder in this application often requires hydraulic pressures exceeding 3,500 PSI just to break the box free from the frame, causing pump screech, relief valve chatter, and blown hose fittings.
Upgrading to the 6 Inch Bore Scissor Hoist Kit for Dump Truck increases the piston working area by 44% compared to standard 5-inch units. At a conservative operating pressure of 2,800 PSI, the 6.0-inch bore delivers over 79,000 lbs (35.8 metric tons) of raw thrust directly into the scissor pivot cross-tube, effortlessly breaking away overloaded 15-ton dump boxes without straining the hydraulic power unit.
| Item | Parameter & Description |
|---|---|
| Working Condition | Flat 0° Deck Position @ 15T Load |
| Leverage Feature | Zero Natural Leverage |
| Cylinder Spec | 6.0" Bore Cylinder, 79,000 lbs Thrust @ 2,800 PSI |
| Mounting Point | Scissor Arm Cross-Tube |
| Performance Advantage | Effortless Box Breakaway Lift Without Hydraulic Relief Chattering |
I. Subframe Blueprinting: 5.6-Inch Low-Profile Installation
For commercial truck upfitters, maintaining a low bed height is critical for stability and easy side loading with skid steers.
The 6 Inch Bore Scissor Hoist Kit for Dump Truck collapses to a total height of just 5.60 inches (142.2 mm):
1. Direct Fit Between 6" Long-Sills: The heavy scissor frame drops cleanly between standard 6-inch C-channel or I-beam dump body subframe stringers.
2. Zero Crossmember Notching: You do not need to cut structural notches in the chassis crossmembers or fabricate tall spacer risers.
3. Rigid Dual Scissor Arms: Laser-cut from 5/8-inch high-tensile steel plate, the scissor arms resist lateral racking when dumping on unlevel jobsites.
II. Patented Velocity Fuse: Fail-Safe Hose Rupture Protection
A severed hydraulic line on an elevated 15-ton dump truck is catastrophic. If a high-pressure hose bursts under load, an unprotected dump box can free-fall in less than two seconds, crushing the truck chassis and endangering workers.
Every 6 Inch Bore Scissor Hoist Kit for Dump Truck includes HCIC's patented Velocity Fuse Load-Holding Valve directly integrated into the cylinder base port.
| Working Mode | Function & Parameter |
|---|---|
| Normal Dumping / Lowering | Smooth Oil Return to Tank (< 3 GPM Flow Velocity) |
| Hose Rupture Emergency | High Velocity Trips Internal Poppet Instantly; Controlled Bleed Descent Rate: < 1.5 in/sec Safe Landing |
III. Chassis Rigging & Welding Protocol for Fabricators
Follow these structural welding standards when mounting the hoist assembly:
Centerline Alignment: Clamp the scissor lower pivot brackets square to the chassis centerline within ±1.0 mm.
AWS D1.1 Full-Penetration Welds: Use 7018 low-hydrogen stick electrode or ER70S-6 MIG wire with multi-pass fillet welds on the lower chassis mounting brackets and rear hinge blocks. Never weld directly to the hydraulic cylinder tube.
Rear Hinge Spread: Position the rear pivot brackets as wide as possible along the rear crossmember to distribute tipping torque evenly across the chassis frame rails.
Grease Purge: Pump lithium EP2 grease into all 6 grease zerks until fresh grease purges around the hardened bronze pivot bushings.
IV. Volume OEM Purchasing & Factory Direct Support
Scale your commercial dump truck manufacturing line with the 6 Inch Bore Scissor Hoist Kit for Dump Truck.
Turnkey Packaging: Each kit is pre-assembled and crated with cylinder, scissor frame, rear hinges, safety prop arm kit, velocity fuse valve, and 12V/24V power unit.
Custom Engineering: 3D CAD models (STEP/IGES) and customized mounting brackets tailored to your specific truck chassis dimensions.
Global Shipping: Rust-proof VCI barrier crating in heavy-duty fumigated wooden cases for fast ocean container delivery.
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