The HSG series construction machinery hydraulic cylinder is a double-acting hydraulic actuator manufactured to the main technical parameters (MTI) standard for construction equipment hydraulic systems. The series covers two structural configurations — HSGK01 (tie-rod / compact profile) and HSGL01 (flanged / long-stroke) — across bore sizes from Φ50 mm to Φ160 mm, producing thrust forces from 31.42 kN to 321.7 kN at the rated operating pressure.

These cylinders convert hydraulic pressure from the machine’s pump circuit into precision linear motion at the actuator — extending the boom, driving the bucket curl, positioning the blade, lifting the load, or controlling the undercarriage. The geometry and pressure rating of each model in the series are matched to the mechanical advantage requirements of the specific structural arm, linkage, or implement it drives.

The HSGK01-160/90E-131 is the highest-capacity model in the series — Φ160 mm bore, Φ90 mm rod, 715 mm stroke — producing 321.7 kN thrust and 219.9 kN pulling force. It is sized for main boom cylinders on 20–40-tonne excavators and primary lift cylinders on medium cranes.

At the compact end, the HSGL01-50/28E-131 — Φ50 mm bore, Φ28 mm rod, 140 mm stroke — produces 31.42 kN thrust and is specified for auxiliary actuators, cab tilt cylinders, and bucket positioning mechanisms on compact construction equipment. With 10 standard models between these two points, the HSG series covers the majority of construction equipment hydraulic actuator positions without requiring custom engineering.

Bore Range Φ50–Φ160 mm

Ten standard models span the actuator force range from 31.42 kN (compact equipment auxiliaries) to 321.7 kN (main boom on 20–40T excavators) — without custom engineering. This range covers excavator boom, arm, and bucket cylinders; bulldozer blade lift and tilt; crane boom hoist; and grader blade positioning in a single product series.

CNC-Bored Barrel · Ra 0.2–0.4 μm

Barrel bore roller-finished to Ra 0.2–0.4 μm after CNC boring. Construction machinery cylinders operate under contaminated oil conditions — road dust, concrete particles, and hydraulic fluid degradation products all pass the filter and abrade bore surfaces. The precision bore finish maximises piston seal contact area, delaying the onset of internal bypass that causes controllability loss in excavator arm and blade positioning.

Hard Chrome Rod · Min. 25 μm Deposit

Piston rods are hard-chrome plated to minimum 25 μm and precision-ground. Construction site exposure — concrete dust, aggregate spray, water wash, deicing salt — attacks unprotected rod surfaces and damages rod seals within 200–400 hours. The chrome layer provides the corrosion and abrasion resistance needed to reach scheduled 1,000-hour seal replacement intervals without unplanned field failures.

HSGK01 & HSGL01 Dual Configuration

HSGK01 uses a tie-rod / compact profile for installations with restricted radial clearance — common in excavator bucket curl positions. HSGL01 uses a flanged profile optimised for long-stroke installations — crane boom hoist and dozer blade lift — where end-cap weld strength under sustained tension load is the design-limiting factor. Selecting the correct configuration for the installation geometry prevents premature fatigue failure at the end cap joint.

Dual-Lip Piston Seal + Wiper Seal System

Dual-lip piston seals maintain pressure separation between rod-side and cap-side chambers throughout the cylinder’s high-cycle duty. The external wiper seal at the gland entry blocks contaminated rod surface material from entering the cylinder on retraction — the most common contamination path in construction site conditions. Seal compound is rated −30°C to +80°C for Canadian winter construction operations.

ISO 9001 · CE · Full Documentation

ISO 9001:2015 manufacturing certificate and CE declaration ship with every order. Individual pressure test report at 1.5× rated working pressure available. EN 10204 3.1 material test certificates for steel and seal compounds available on request — supporting procurement compliance for construction equipment importers in Canada and Australia under equipment safety and import documentation requirements.

Daily · Pre-Shift

Visually inspect all exposed rod surfaces for oil film, pitting, or surface contamination. Wipe rod surfaces clean before the first retraction cycle of the day. Any grit entering the wiper seal during retraction acts as abrasive on every subsequent extension — accelerating both rod and seal wear geometrically with contamination particle size.

Every 250 Hours

Check hydraulic oil cleanliness — construction site operation typically degrades hydraulic oil to NAS Class 10–12 within 200–300 hours. Change hydraulic oil filter elements and measure oil cleanliness. Target NAS Class 8 or ISO 4406 17/15/12 as the maximum acceptable contamination level to protect bore and seal surfaces.

Every 1,000 Hours

Inspect rod chrome surfaces for pitting, delamination, and scoring. Check pin bore wear on trunnion and clevis mounts — elongation beyond 0.5 mm introduces angular loading on the rod seal that accelerates leakage. Proactively replace the complete seal kit at 1,000 hours regardless of visual condition — seal degradation is not visible until after leakage begins.

Off-Season Storage

Park machines with cylinders in the retracted position to minimise exposed rod surface area. Apply a thin coat of anti-corrosion fluid to any exposed rod surface if storage exceeds 3 weeks — particularly important for Canadian winter storage where freeze-thaw cycling creates condensation inside unheated equipment shelters. Cap all hydraulic ports before storage.

Excavators — Boom, Arm & Bucket

The HSGK01-160/90E-131 (321.7 kN thrust) and HSGL01-100/60E-131 (125.66 kN) cover boom and arm cylinder positions on 15–40-tonne excavators. The compact HSGK01 profile fits the restricted radial clearance of bucket curl positions. An excavator operating a 10-hour shift executes 3,000–6,000 full cylinder cycles — the seal and bore finish specifications are selected for this duty cycle.

Bulldozers — Blade Lift & Tilt

HSGK01-80/50E-131 models (101.79 kN thrust, strokes 550–700 mm) cover blade lift and tilt on D6–D8 class dozers. Dozer blade cylinders face the most severe shock loading of any construction machine actuator — blade strike against buried rock or concrete generates impact loads 3–5× the continuous rated value. The dual-lip piston seal and hard-chrome rod are sized for this shock-load environment.

Mobile Cranes — Boom Hoist & Outrigger

HSGL01-100/60E-131 (1,200 mm stroke, 125.66 kN thrust) covers boom elevation and outrigger extension on 10–25-tonne mobile cranes. Long-stroke crane cylinders require accurate position control at slow speeds — internal bypass from a worn bore causes the boom to creep downward under load, creating unsafe load-suspension drift. The Ra 0.2–0.4 μm bore finish maintains this control throughout the cylinder’s service life.

Graders & Scrapers — Blade Positioning

HSGL01-80/50 and HSGL01-63/35 models cover moldboard lift, side-shift, and circle-drive actuators on motor graders. Blade positioning cylinders require consistent hold force when the cylinder is stationary — internal bypass from worn seals causes the blade to drift off the set grade angle, directly reducing surface quality and requiring repeated re-cuts.

Compact & Mini Construction Equipment

HSGL01-63/35E-131 (50 kN) and HSGL01-50/28E-131 (31.42 kN) cover boom and arm positions on 3–8-tonne mini excavators, compact telehandlers, and skid-steer attachment actuators. The smaller bore models in the HSG series use the same chrome rod and bore finish specification as the large models — they are not downgraded for compact equipment applications.

OEM Manufacturers & Equipment Dealers

Factory-fit and aftermarket supply for construction equipment OEMs and dealer networks. 10 standard HSG models available from stock, with CE documentation and ISO 9001 certificates for Canadian and Australian import compliance. Custom stroke and bore available for non-standard machine positions. B2B wholesale pricing from 5 units per model.

Verified B2B · 6 machines · 2,800 hrs