Description
HSG Series Plant Protection Cylinders: Built for Sprayer Environments
The HSG Series Plant Protection Machinery Hydraulic Cylinders address one of the most demanding application environments in agricultural equipment: boom sprayer systems operating in direct contact with pesticide, herbicide, and fertiliser chemicals. The six-model series covers every hydraulic actuation point on a modern self-propelled or trailed boom sprayer — from the output steering cylinder through shock absorbers, spray bar lift, spray bar fold, spray bar locking, and cab lift functions. Bore diameters range from 40mm to 80mm with strokes spanning 150mm to 760mm, and every model carries a corrosion-resistant coating system selected specifically for chemical spray environment durability. For equipment manufacturers designing or upgrading boom sprayer hydraulic systems, this series eliminates the complexity of sourcing six different cylinder specifications from multiple suppliers.
Complete Six-Model Parameter Reference
Verify installation distance alongside bore and stroke for dimensional package compatibility. “Plunger diameter” in the original specification is equivalent to bore diameter in standard nomenclature.
| Model | Bore (mm) | Stroke (mm) | Install. (mm) | Function |
|---|---|---|---|---|
| HSG80/50×190-800 | 80 | 190 | 800 | Output steering cylinder |
| HSG80/50×210-510 | 80 | 210 | 510 | Shock absorber cylinder |
| HSG70/30×760-1055 | 70 | 760 | 1055 | Spray bar lifting cylinder |
| HSG40/22×270-495 | 40 | 270 | 495 | Spray bar folding cylinder |
| HSG50/25×150-800 | 50 | 150 | 800 | Spray bar locking cylinder |
| HSG63/35×500-780 | 63 | 500 | 780 | Cab lift cylinder |
Chemical Resistance: The Design Priority That Defines This Series
A hydraulic cylinder for agricultural sprayers faces a chemical exposure profile that most industrial cylinders are never designed to handle. Pesticide concentrates, fungicide solutions, nitrogen-based fertiliser liquid, and cleaning agents contact the cylinder exterior during normal operation. Paint systems adequate for general agricultural use often show accelerated degradation under the specific compounds used in plant protection applications.
All exterior surfaces use a two-coat system: a zinc phosphate primer provides the corrosion barrier and paint adhesion layer, followed by a polyurethane topcoat resistant to the chemical families common to agrochemical formulations. Port threads are protected with temporary thread protectors during storage and shipping. The hard chrome rod surface is largely impervious to the dilute chemical solutions that contact it in normal sprayer use.
Spray Bar System: Lift, Fold, and Lock Cylinders
Spray Bar Lifting — HSG70/30×760-1055
The longest-stroke cylinder in the series at 760mm, reflecting the large vertical travel needed to raise or lower the entire boom assembly between field operating height and transport or maintenance position. The 70mm bore provides force authority to lift the boom even when weighted with spray solution residue and mechanical deposits.
Spray Bar Folding — HSG40/22×270-495
Drives the inward fold of boom wings for field-to-road transition. On wide-working-width sprayers, folding occurs dozens of times daily. This high cycle-count application places demands on seal friction characteristics — the HSG40/22×270-495 seal package is tuned for consistent low-friction movement from rest, avoiding the pressure spike at cycle initiation that causes stick-slip and jerky boom movement.
Spray Bar Locking — HSG50/25×150-800
Mechanically latches the boom in working or transport position. The 800mm installation distance reflects the physical gap between machine frame and boom arm in the locked position. Its 150mm stroke is the shortest in the series, consistent with a latching rather than positioning function — hydraulic flow demand is minimal for this cylinder.
Steering and Shock Absorption: Safety-Relevant Cylinders
Output Steering Cylinder — HSG80/50×190-800
At 80mm bore, this is the largest and most safety-critical unit in the series. It provides the final steering force output at the axle, converting hydraulic pressure into wheel angle change. The 800mm installation distance and 190mm stroke reflect a typical articulated or rear-axle steering geometry. This cylinder undergoes the same 100% pressure test as all units plus additional rod straightness and gland assembly verification meeting the higher standard appropriate for steering applications.
Shock Absorber Cylinder — HSG80/50×210-510
Also 80mm bore but with different stroke and installation distance, this cylinder provides hydraulic damping for the boom suspension system. Modern self-propelled sprayers use active or passive hydraulic suspension to isolate the boom from machine frame vibration during field travel — otherwise boom bouncing causes uneven spray distribution. The HSG80/50×210-510 provides controlled resistance to movement within this suspension circuit. Our technical team can advise on accumulator sizing and circuit configuration for this application.
Cab Lift Cylinder — HSG63/35×500-780
Handles vertical travel of the operator cab on self-propelled sprayers with height-adjustable cab positioning. At 63mm bore and 500mm stroke, this cylinder involves a static load hold for extended periods — placing emphasis on internal bypass characteristics. Any seal degradation allowing internal bypass results in cab drift, a safety concern requiring immediate attention. Our seal specification for this model includes an additional pressure-loaded check element in the piston seal design that minimizes bypass tendency as seals age.
Manufacturing Standards and Quality Control
The HSG Series plant protection cylinders are produced at our Hangzhou facility with additional process controls applied for the chemical-exposure-grade surface treatment steps. Our coating facility maintains controlled environmental conditions during application to ensure primer adhesion and topcoat cure quality. Final inspection includes visual coating coverage check, dimensional verification of critical surfaces, and pressure test before packing in individual protective packaging to prevent transit damage to rod surfaces and port threads.
Compatibility and Ordering
The HSG Series has been validated in both OEM supply and aftermarket replacement roles across self-propelled sprayer platforms from multiple manufacturers. The bore, stroke, and installation distance for each model aligns with common design parameters used in 24m to 36m boom width self-propelled platforms — the mainstream working width range for large-acreage crop protection applications.
Contact Hangzhou Ever-Power Hydraulic Cylinder Co., Ltd. at +86-571-88220653 or [email protected]. Visit our about us page for manufacturing capability background, or submit requirements via the contact form. Our facility at Shenhua Road, Hangzhou handles supply programs for equipment manufacturers across Europe, North America, and Australasia.
