Sourcing the 63-4402-120 3-stage pin-to-pin telescopic cylinder for dump bodies? Explore OEM specs: 120.38" stroke, 53.00" closed length, 1" NPTF port, and self-bleeding V-pack seals.
Total Working Stroke:
3058mmRetracted Closed Pin-to-Pin:
1346mmFully Extended Pin-to-Pin:
4404mmOuter Main Barrel Diameter:
178mmUpper Rod Eye Pin Diameter:
51mmLower Base Eye Pin Diameter:
52mmUpper Eye Width:
44mmLower Eye Width:
54mmWhen building or maintaining a medium-to-heavy commercial dump body, structural packaging is always the primary challenge. You need over 10 feet of vertical stroke to achieve a steep 50-degree dump angle for sticky clay, asphalt, or aggregate, but the chassis doghouse allows less than four and a half feet of closed mounting height.
The 63-4402-120 3-Stage Pin-to-Pin Telescopic Hydraulic Cylinder for Dump Bodies is engineered specifically to bridge that gap. Delivering a massive 120.38-inch (3,058 mm) stroke from a compact 53.00-inch (1,346 mm) closed length, this 3-stage pin-to-pin hoist provides the clean extension geometry, column rigidity, and oil displacement needed for fast, stable tipping cycles.
Air trapped in a multi-stage cylinder causes jerky, bouncy extension and dangerous stage-lag. The 63-4402-120 features an internal self-bleeding design that purges aerated fluid back to the reservoir every time the cylinder reaches full 120.38-inch extension, ensuring smooth, predictable hoist motion without manual bleeding screws.
Standard multi-stage seals often weep during light-load gravity lowering when circuit pressure drops near zero. This cylinder incorporates pre-loaded V-packing energized by a self-adjusting wave spring (with an optional energized ‘Z’ seal package). The wave spring maintains constant radial lip compression across temperature swings from -40°C to +100°C.
Unlike welded or snap-ring cylinders that must be scrapped when a gland seal wears, the 63-4402-120 utilizes precision-machined threaded headnuts. This design provides superior mechanical retention against pressure spikes and allows maintenance technicians to easily adjust or repack seals on-site.
When dumping asphalt or crushed stone on uneven job-site grades, side winds and off-center payload shifts create immense bending moments. The HCIC 4000 Series is built with extended internal bearing sleeve lengths, providing wide overlap between nested stages to prevent metal-to-metal galling and stage binding.
One of the most frequent installation mistakes on dump trailers is running an undersized hydraulic reservoir.
| Feature / Model | L-HYC00823 (This Model) | L-HYC00905 (Slide Cylinder) | M-1419165 (Heavy Slide) |
|---|---|---|---|
| Primary Function | Sweep / Packer Blade | Upper Slide Carriage | Upper Slide Carriage |
| Bore Diameter | 4.5 inches | 5.5 inches | 5.0 inches |
| Rod Diameter | 2.5 inches | 2.5 inches | 4.0 inches |
| Stroke Length | 22.75 inches | 37.0 inches | 32.5 inches |
| Duty Focus | Fast Compaction Stroke | Long Reach Carriage Travel | High-Tonnage Ejection Force |
Yes. While the standard catalog model features a 1" NPTF dryseal port, HCIC can manufacture custom port blocks with SAE #12 or SAE #16 O-ring boss threads upon request.
Yes. The 2.00" upper and 2.06" lower pin sizes conform to standard North American commercial body mounting brackets for medium dump trucks, pup trailers, and end-dump gooseneck trailers.
For temperate climates, standard ISO VG 32 or ISO VG 46 anti-wear hydraulic oil is recommended. For cold-weather northern operations down to -40°C, use ISO VG 15 or MIL-PRF-5606 low-temperature synthetic fluids.
All multi-stage pin-to-pin telescopic cylinders must be mounted with upper and lower pin axes exactly parallel (within 1/16" across the pin span). Misalignment creates torsional twisting that leads to premature stage gland wear. Always install mechanical body props before servicing raised dump beds.
HCIC engineers and manufactures complete telescopic cylinders, custom hydraulic power units, and trailer tipping kits for commercial body builders worldwide.
