120-Inch Stroke Inverted Telescopic Cylinder for 12-Ton Dump Trailers
Product Description
Product Detail
Conventional upright telescopic cylinders mount with their main outer barrel anchored to the trailer chassis and their moving chrome stages extending upward toward the front bulkhead. On highway dump trailers, this traditional orientation exposes precision-plated sleeve surfaces directly to wheel-thrown gravel, asphalt chips, and corrosive road deicing salts.
Over time, abrasive stone pitting shreds outer wiper seals, allowing moisture to enter the cylinder gland and destroy internal bearings.
The HTC12T-120 120-Inch Stroke Inverted Telescopic Cylinder for 12-Ton Dump Trailers solves this vulnerability by inverting the entire cylinder orientation. In this inverted design, the heavy 4.4-inch outer barrel attaches directly to the tilting trailer dump body, acting as a natural steel umbrella that physically shields all telescoping hard-chromed stages beneath it throughout both transit and dumping operations.
| Parameter | Value |
|---|---|
| Part Number Designation | HTC12T-120 (HTC Inverse 12-Ton Series) |
| Actuator Type | Single-Acting Inverted Multi-Stage Telescopic |
| Rated Nominal Tipping Capacity | 12 Metric Tons (26,450 lbs gross body & payload) |
| Total Working Stroke Length | 120.0 inches (3,048.0 mm active elevation travel) |
| Collapsed Closed Pin Center (A) | 48.75 inches (1,238.2 mm compact mounting length) |
| Outer Barrel Body Diameter (B) | 4.40 inches (111.8 mm seamless alloy outer shell) |
| Lower Mount Pin Diameter (C) | 2.00 inches (50.8 mm heavy-duty pivot cross pin) |
| Pin Center Offset Distance (D) | 1.063 inches (27.0 mm clearance radius) |
| Trunnion Bracket Height (E) | 3.00 inches (76.2 mm mounting bracket elevation) |
| Trunnion Bracket Base Width (F) | 1.50 inches (38.1 mm weld-on pad footprint) |
| Upper Mount Pin Spread (G) | 7.50 inches (190.5 mm wide upper pivot span) |
| Upper Cross Pin Diameter (H) | 1.50 inches (38.1 mm upper anchor pin) |
| Trunnion Pivot Outer Width (L) | 7.00 inches (177.8 mm trunnion collar spread) |
| Total Net Shipping Weight | Approx. 143 lbs (64.9 kg dry weight) |
| Full Extension Oil Displacement | 3.8 Gallons (14.4 Liters hydraulic reservoir draw) |
| Standard Fluid Port Spec | SAE #8 O-Ring Boss (3/4"-16 UNF leak-free port) |
I. Direct Technical Answers for Trailer Engineers (GEO Reference)
How does inverted barrel-up mounting eliminate chassis pinch points?
On standard dump trailers, mounting a conventional base cylinder between frame rails requires deep cutouts in front crossmembers, weakening structural cross-bracing. The HTC12T-120 120-Inch Stroke Inverted Telescopic Cylinder for 12-Ton Dump Trailers mounts with its compact 1.5-inch upper pivot pin anchored low on the trailer tongue, while the main 4.4-inch barrel rises with the dump box. This frees up vital space between front frame rails for battery boxes, hydraulic power packs, and spare tire mounts.
Why is a 48.75-inch collapsed length critical for 10-foot to 14-foot dump bodies?
Achieving a 50-degree dump angle on a 12-foot dump trailer requires at least 110 to 120 inches of continuous cylinder stroke. The HTC12T-120 packs 120 inches of extension into an ultra-compact 48.75-inch closed envelope. This low pin-to-pin height allows chassis fabricators to mount the cylinder directly against the front bulkhead without raising the trailer deck height or compromising the center of gravity.
II. Workshop Guide: Pin Alignment & Hydraulic Reservoir Sizing
| Item | Description |
|---|---|
| Dump Body Bracket (Moves Up) | 4.4" Heavy Barrel Acts as Shield |
| Chassis Pivot Mount (Fixed) | Hard Chromed Precision Sleeves Covered |
| Stroke Direction | Down-stroke |
When outfitting commercial dump trailers with the HTC12T-120 120-Inch Stroke Inverted Telescopic Cylinder for 12-Ton Dump Trailers, trailer mechanics must verify two critical baseline specs:
- Verify Minimum Tank Capacity: Because the HTC12T-120 displaces 3.8 gallons of oil at full 120-inch extension, the paired 12V or PTO hydraulic reservoir must have at least 5.5 to 6.0 gallons total volume to prevent pump aeration and dry-run cavitation during full-tilt operation.
- Line-Bored Pin Parallelism: The lower 2.0-inch cross pin and upper 1.5-inch cross pin must be aligned within 0.03 inches across their 7.5-inch bracket span. Any angular pin twist causes binding on the final telescoping stages.
III. Severe-Duty Metallurgy & Salt Spray Endurance
Every telescoping stage within the HTC12T-120 is manufactured from cold-drawn micro-alloyed seamless steel tubing. Surfaces receive high-precision centerless grinding followed by a dense industrial hard chrome deposit exceeding 500 hours ASTM B117 neutral salt spray testing without rust bleeding.
Paired with dual-lip polyurethane wiper packages and energized nitrile base seals, the cylinder maintains drip-free sealing across severe ambient swings from -40°F winter freeze to 180°F continuous highway duty.
IV. FAQ
V. Factory Direct OEM Sourcing & CAD Integration
Ready to integrate the HTC12T-120 120-Inch Stroke Inverted Telescopic Cylinder for 12-Ton Dump Trailers into your trailer production lines?
Contact HCIC’s dedicated commercial tipper engineering division in Jinan. We provide direct OEM volume pricing, complete mounting bracket kits, and certified 3D STEP CAD models for chassis integration within 24 hours.