Bore Precision

Φ90 mm CNC-Bored · Ra 0.2–0.4 μm

Barrel bore is roller-finished to Ra 0.2–0.4 μm after CNC boring. This surface roughness range maximises piston seal contact area and keeps internal leakage below the threshold that causes thrust force loss and uneven extension speed — both critical in compaction and sweeping applications where cycle consistency directly affects output.

Rod Protection

Φ63 mm Hard Chrome · Min. 25 μm

Sanitation vehicles operate in conditions that attack exposed metal: mud, road chemicals, salt spray, and compacted waste residue. The Φ63 mm rod is hard-chrome plated to a minimum 25 μm deposit. This protects the rod surface from abrasion and corrosion that would otherwise deteriorate the rod seal contact surface and cause weeping within the first operating season.

Pressure Rating

16 MPa Continuous — Factory Tested

Rated at 16 MPa (160 bar), matching the hydraulic system working pressure of standard municipal sanitation vehicles. Every unit is factory hydrostatic-tested before shipment at a minimum 1.5× rated pressure (24 MPa). Pressure test report available on request for compliance documentation and maintenance records.

Port Threading

2-M22×1.5 — Standard Sanitation Vehicle Interface

Both hydraulic ports are machined to 2-M22×1.5 thread — the interface standard used on the majority of Chinese-manufactured sanitation vehicle hydraulic systems. This allows direct hose connection to the existing hydraulic circuit without thread adapters or fittings, reducing installation time and eliminating additional potential leak points.

Weld Quality

Robotic MIG Welding — Consistent Penetration

End cap and barrel joint welds are produced by robotic MIG welding at controlled travel speed, wire feed, and shielding gas parameters. Consistent weld penetration eliminates the porosity and undercut defects common in manual welding — the primary initiation points for barrel weld cracking under the cyclic pressure loading of a high-frequency compaction or sweeping cycle.

Documentation

ISO 9001 · CE · Pressure Test Report

ISO 9001:2015 manufacturing certificate, CE declaration of conformity, and individual pressure test report ship with every unit. Material test certificates (EN 10204 3.1) available for steel and seal compounds on request — supporting vehicle maintenance records and municipal procurement compliance requirements.

Daily — Before Each Shift

• Visually inspect the rod surface for scratches, pitting, or mud accumulation that could carry abrasive material past the rod seal on the next extension stroke.
• Check both M22×1.5 port fittings for seepage — a weeping fitting creates air ingestion risk on retraction that produces cavitation noise and accelerates internal seal wear.
• Confirm the rod retracts fully — a partially retracted rod left exposed during parking increases corrosion risk, especially in salt-road environments.

Every 250 Operating Hours

• Check hydraulic oil for contamination — ISO VG 46 hydraulic oil with NAS Class 8 cleanliness or better. Contaminated oil is the primary cause of accelerated piston seal and rod seal wear at 16 MPa operating pressure.
• Inspect the wiper seal for embedded grit or deformation. A damaged wiper allows road debris to migrate to the rod seal, typically causing leaking within 200–400 additional hours.
• Torque-check all mounting pin retaining hardware to specification — cyclic thrust loads loosen fasteners over time.

Every 1,000–1,500 Hours

• Proactive seal kit replacement: piston seal, rod seal, wiper seal, and O-rings. Seal replacement at 1,000–1,500 hours before visible leakage typically extends cylinder body service life by 3–5× compared to operating to first-leak then repairing.
• Drain and flush hydraulic oil — regardless of appearance, oil degradation products accumulate and accelerate seal compound degradation at operating temperature.
• Inspect chrome rod surface for pitting below 0.2 mm depth. Surface pitting above this threshold should trigger rod re-chroming or rod replacement before it damages the rod seal groove.

Storage & Off-Season

• Fully retract the rod before storage — this protects the chrome surface and keeps the wiper seal in its designed seating position.
• Apply a thin coat of anti-corrosion oil to any exposed machined surfaces on the rod end and port areas if storing for more than 30 days in a humid or salt-air environment.
• Cap both M22×1.5 ports with thread-sealing plugs during storage to prevent hydraulic oil oxidation and moisture ingestion.

Verified B2B · ×3 units