An engineering analysis of the M-1401720 4-Stage 138-Inch Double Acting Telescopic Ejector Cylinder for 28-Yard Refuse Packers, featuring a 4-stage nested configuration, 138.0-inch compaction stroke, 16–25 MPa working pressure range, rod-head integrated SAE ports, and dual-chamber internal shock relief valves for commercial waste collection bodies.
Cylinder Classification:
Double-Acting Multi-Stage Telescopic CylinderPrimary Vehicle Application:
M 28-Yard Commercial Hydraulic Ejector / PackerNumber of Expansion Stages:
4 Active Precision-Nesting Telescopic StagesTotal Working Travel Stroke:
138.0 inches (3,505.2 mm continuous stroke)Rated Working Pressure Range:
16 to 25 MPa (2,320 to 3,625 psi operational limit)In 28-yard commercial rear-loading and side-loading waste collection bodies, the ejector blade must deliver intense forward compaction force to crush bulky commercial cardboard, followed by smooth powered retraction through stubborn debris.
Single-acting cylinders with gravity or cable return repeatedly fail under heavy landfill conditions when wet waste wedges behind the packer panel.
The M-1401720 4-Stage 138-Inch Double Acting Telescopic Ejector Cylinder for 28-Yard Refuse Packers provides reliable two-way hydraulic power across four precision-machined nested stages. Delivering 138.0 inches (3,505.2 mm) of active stroke travel within a compact collapsed installation footprint, this heavy-duty refuse cylinder generates up to 800 kN of forward compaction thrust and up to 500 kN of hydraulic retraction pull across operating pressures from 16 to 25 MPa.
| Parameter | Specification |
|---|---|
| Part Identification | M-1401720 |
| Cylinder Classification | Double-Acting Multi-Stage Telescopic Cylinder |
| Primary Vehicle Application | M 28-Yard Commercial Hydraulic Ejector / Packer |
| Number of Expansion Stages | 4 Active Precision-Nesting Telescopic Stages |
| Total Working Travel Stroke | 138.0 inches (3,505.2 mm continuous stroke) |
| Rated Working Pressure Range | 16 to 25 MPa (2,320 to 3,625 psi operational limit) |
| Forward Compaction Force (Cap Side) | 50 to 800 kN (matched to commercial packer load) |
| Powered Recovery Pull (Rod Side) | 30 to 500 kN (overcomes wedged debris jams) |
| Integrated Porting Design | Ports machined into final rod head (SAE #12/#16) |
| Internal Pressure Protection | Cap relief (1.2–1.5×) / Rod relief (1.1–1.3×) |
| Relief Valve Response Time | ≤ 50 milliseconds (rapid pressure spike unloading) |
| Operating Temperature Rating | -45°C to +80°C (-49°F to 176°F all-weather seals) |
| Ingress & Environmental Protection | IP65 rated against water jets and organic leachate |
Traditional telescopic packer cylinders run external hydraulic hoses across each moving stage, where they constantly rub against refuse guide tracks and snag on discarded metal wire. The M-1401720 4-Stage 138-Inch Double Acting Telescopic Ejector Cylinder for 28-Yard Refuse Packers routes hydraulic fluid internally through the central telescoping core, placing all supply ports directly at the final rod head. This eliminates external stage hose draping, reducing hose failure rates by over 70% in municipal fleet operations.
When an uncrushable solid object (such as a discarded steel beam or concrete block) jams against the ejector panel, hydraulic line pressure spikes instantaneously. The M-1401720 incorporates dual internal relief valves that respond in under 50 milliseconds. The cap-cavity valve unloads excess pressure before barrel welds or piston seals suffer plastic deformation, while the rod-cavity valve protects guide sleeves during rapid blade retraction.
| Stage | Structure Part | Material & Feature |
|---|---|---|
| Stage 1 | Main Barrel | High-Yield Seamless Alloy Shell (Induction Hardened) |
| Stage 2 & 3 | Sleeves | Precision Honed & Hard Chrome Plated (>500h Salt Spray) |
| Stage 4 | Final Rod | Integrated SAE Fluid Ports + Heavy Poly Scraper Wiper |
Commercial refuse trucks operate in a continuous bath of corrosive organic acids and abrasive grit. The M-1401720 4-Stage 138-Inch Double Acting Telescopic Ejector Cylinder for 28-Yard Refuse Packers is engineered with four chemical and mechanical barriers:
To maximize service life on McNeilus, Heil, and Leach style refuse packer bodies:
Looking to upgrade your municipal waste fleet with the M-1401720 4-Stage 138-Inch Double Acting Telescopic Ejector Cylinder for 28-Yard Refuse Packers?
Contact HCIC’s specialized refuse equipment engineering team in Jinan. We offer direct OEM container pricing, turnkey seal rebuild packages, and certified 3D STEP CAD models for chassis integration within 24 hour.
