Description
ZG/HSG Series: Hydraulic Cylinders Engineered for Harvesting Machinery
The ZG/HSG Series provides five distinct cylinder configurations matched to specific functions within a combine harvester: continuously variable speed (CVT) actuation, steering, header height control, crusher drive, and ear box adjustment. Rather than sourcing five different cylinder types from multiple suppliers, equipment designers and aftermarket teams can qualify a single manufacturer for the full range. The series spans bore diameters from 40mm to 70mm and stroke lengths from 67mm to 480mm, covering the complete motion requirements for modern harvesting platforms. Each model reflects a specific engineering trade-off between bore force, stroke travel, and physical envelope — decisions shaped by the function’s actual duty cycle and load profile within the machine.
Complete Model Parameter Table — ZG/HSG Series
Engineers matching these cylinders to a specific machine should verify installation distance against mounting point geometry in addition to bore and stroke dimensions, as installation distance governs the overall retracted package length.
| Model | Bore (mm) | Rod (mm) | Stroke (mm) | Install. (mm) | Function |
|---|---|---|---|---|---|
| HSG40/22×67-300 | 40 | 22 | 67 | 300 | Continuously variable speed |
| HSG50/22×143-345 | 50 | 22 | 143 | 345 | Steering cylinder |
| TG-E50x325-580 | 56 | 50 | 325 | 580 | Header oil cylinder |
| HSG55/22×450-305 | 55 | 22 | 450 | 305 | Crusher oil cylinder |
| HSG70/40×480-750 | 70 | 40 | 480 | 750 | Ear box oil cylinder |
Function-by-Function Engineering Review
CVT Cylinder — HSG40/22×67-300
The CVT cylinder is among the most precision-sensitive applications in the harvesting hydraulic circuit. Its 67mm stroke controls the ratio adjustment in the continuously variable transmission, translating directly to ground speed and threshing drum speed coordination. Positional inaccuracy or hysteresis produces inconsistent machine speed response, affecting crop loss and fuel efficiency. The 40mm bore and 22mm rod give this unit a compact profile suited to the typically confined CVT housing environment.
Steering Cylinder — HSG50/22×143-345
The steering cylinder is a safety-relevant component. The HSG50/22×143-345 provides the force authority required for machines at field weight, while the 143mm stroke delivers sufficient angular travel at the steering axle. Welded body construction is particularly appropriate here — steering cylinders experience complex loading including minor side loads from road and field irregularities, and a welded body resists these without tie-rod fatigue risk.
Header Cylinder — TG-E50x325-580
The header height cylinder performs thousands of positioning cycles per season as the combine tracks ground contour. The 325mm stroke and 56mm bore handle this constant-duty profile. The 50mm rod provides column strength needed when the header encounters an obstruction and the cylinder absorbs the resulting shock load without rod buckling. This is the highest-duty-cycle cylinder in the series.
Crusher Cylinder — HSG55/22×450-305
The crusher cylinder adjusts clearance in the crop processing mechanism, controlling throughput and grain separation efficiency. Accurate positioning directly affects grain loss (too wide) and blockage risk (too narrow). This model uses an extended-body construction that allows the 450mm stroke to exceed the 305mm retracted installation distance — contact our engineering team for the detailed dimensional drawing clarifying both positions.
Ear Box Cylinder — HSG70/40×480-750
The largest unit in the series at 70mm bore and 40mm rod, generating substantial force for row-crop header ear box positioning. The 480mm stroke and 750mm installation distance reflect the larger physical displacement in this mechanism. This cylinder operates in the dustiest area of the machine — a factor that informed the selection of a robust external rod wiper specification and particulate-resistant port design.
Shared Design Standards Across the Series
Compact outer envelope and vibration-resistant joint integrity across all five models throughout the harvesting season.
Every model features hard chrome plated and ground piston rods for corrosion protection and the precise surface finish seal longevity depends on.
Seal compounds chosen for wide temperature range, UV tolerance, and ISO VG 46/68 mineral oil compatibility across the full series.
Every unit tested to 1.5x working pressure before shipment, with test records retained for batch traceability.
Customization and OEM Supply Process
Send application data, machine model, functional requirement, and target volume to [email protected].
Our team reviews requirements, proposes specification, and returns a confirmed drawing within 5 working days.
First-article samples dispatched within 20-30 working days of drawing approval. Test report provided with samples.
Upon approval, series production commences. Volume, packaging, and delivery schedule agreed in supply contract.
Contact Hangzhou Ever-Power for Series Pricing
To request pricing for one or multiple models in the ZG/HSG Series, or to discuss a custom combine harvester hydraulic cylinder requirement, reach our team at +86-571-88220653 or [email protected]. Our facility is located at Shenhua Road, Hangzhou. Submit enquiries through our contact form for a response within one business day. When enquiring about OEM supply, include machine type, annual production volume, and which models you require — this allows us to prepare a comprehensive commercial proposal.
