Custom Hydraulic Lift Cylinder — OEM Lift Cylinder with Integrated Check Valve and Sprocket for Forklifts

Forklift Short Lifting Hydraulic Cylinder 1

This is the most complete lift cylinder in the Korea Ever-Power product line — 27 components that include an integrated check valve for fail-safe load holding, a built-in oil pipe for internal flow routing, and a chain sprocket system for stroke multiplication. Where the standard lift cylinder is a bare actuator that depends on external valves and sheaves, this custom lift cylinder arrives as a self-contained lifting subsystem ready for direct integration into multi-stage masts, car lifts, scissor platforms, and agricultural lift mechanisms. OEM and ODM service, 45 kg reference weight, single-acting or double-acting, ISO 9001 certified, MOQ 1 piece.

Категорија: Forklift Hydraulic Cylinders

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Custom Hydraulic Lift Cylinder — Self-Contained Lift System in One Assembly

A standard hydraulic lift cylinder does one thing: convert hydraulic pressure into linear force. The check valve that holds the load, the flow path that routes oil to the bore, and the sheave that multiplies the stroke into carriage travel are all separate components mounted externally on the machine frame. This custom lift cylinder integrates all three functions into the cylinder assembly itself — the check valve sits inside the housing, the oil pipe routes flow through an internal passage, and the chain sprocket mounts directly on the piston rod. The result is a self-contained lifting subsystem that the machine builder bolts in as a single unit, with fewer external components, fewer hose connections, and fewer potential leak and failure points.

Forklift Short Lifting Hydraulic Cylinder 1

Korea Ever-Power builds this cylinder to your specification — bore, stroke, pressure, sprocket configuration, check valve cracking pressure, and mounting geometry are all custom-engineered per the OEM drawing or application requirements. The 27-component architecture serves applications from forklift mast free-lift systems, through automotive vehicle lifts, to agricultural platform mechanisms and industrial scissor lifts.

Components

45 kg

Ref. Weight

OEM

Custom Build

ISO

9001 Certified

1 pc

MOQ

Three Built-In Subsystems That Standard Lift Cylinders Lack

The 27-component architecture of this custom lift cylinder includes three subsystems that transform it from a simple actuator into a self-contained lift mechanism. Each subsystem eliminates an external component that would otherwise need to be separately sourced, mounted, plumbed, and maintained by the machine builder.

SAFETY

Integrated Check Valve (Item 4)

Allows oil into the cylinder bore but blocks return flow until the operator deliberately opens the lowering valve. If a hose upstream of the cylinder bursts while the load is raised, the check valve traps the oil column and the load holds position — it cannot descend. This is the primary load-holding safety device on any single-acting lift system. Integrating it inside the cylinder housing eliminates the external check valve, its mounting bracket, and the two hose fittings that would otherwise connect them — removing three potential leak points from the safety chain.

ROUTING

Internal Oil Pipe (Item 3)

Routes hydraulic fluid from the check valve outlet through an internal passage to the bore inlet port — entirely inside the cylinder housing. An external pipe or hose running along the outside of the cylinder would be exposed to chain contact, mast channel abrasion, and impact damage during operation. The internal routing eliminates this external vulnerability. For car lift and platform lift applications where the cylinder is exposed and accessible to personnel, the internal pipe also eliminates a potential snag point and a cosmetic interruption on the cylinder's external surface.

DRIVE

Chain Sprocket System (Items 11–12)

The sprocket seat and sprocket cover mount on top of the piston rod, providing a pulley point for the lift chain. As the cylinder extends, the chain wraps over the sprocket and lifts the carriage, platform, or load frame at a 2:1 multiplication ratio (2 mm of carriage rise per 1 mm of cylinder stroke). The sprocket bearing surfaces are hardened to withstand the chain tension loading over millions of lift cycles. Integrating the sprocket on the rod eliminates a separate sheave bracket assembly and its associated alignment and maintenance requirements.

Product Specification

Product Type	Custom lift cylinder with integrated check valve, oil pipe, and sprocket
Acting Type	Single-acting (standard for lift) / Double-acting available
Architecture	27-component piston cylinder (check valve + oil pipe + sprocket integrated)
Reference Weight	45 kg (varies by bore, stroke, configuration)
Body Material	20# carbon steel / 45# medium carbon steel
Seal Options	Parker, NOK, Hallite, Busak Shamban
Certification	ISO 9001:2015, ISO 14001, ISO 45003
Quality	100% pressure tested + video outgoing inspection provided
Service / MOQ	OEM + ODM / 1 piece
Applicable Industries	Manufacturing, machinery repair, farms, automotive service
Shipping	Crate or pallet · Port: Shanghai / Ningbo

Beyond Forklifts — Where This Lift Cylinder Architecture Serves

The integrated check valve, oil pipe, and sprocket system make this cylinder architecture applicable to any lifting mechanism that needs fail-safe load holding and chain-driven stroke multiplication. The forklift mast was the original application, but the same design principles apply to a surprisingly broad range of lifting equipment across multiple industries.

types-of-hydraulic-cylinders-6

Forklift Multi-Stage Mast Systems

The primary application. The cylinder provides the free-lift function on triplex masts — raising the forks inside the collapsed mast before the mast itself begins to extend. The integrated check valve is the load-holding device that prevents fork descent in the event of a hydraulic line failure during container loading operations. Every forklift hydraulic cylinder in the free-lift circuit depends on this check valve for operator safety.

Automotive Vehicle Lifts

Two-post and four-post car lifts use single-acting hydraulic cylinders to raise vehicles for underside servicing. The integrated check valve provides the load-holding safety that is legally mandated in most jurisdictions for vehicle lifts — the vehicle must remain at height if the hydraulic power is lost. The internal oil pipe eliminates exposed external plumbing that mechanics could accidentally damage during vehicle servicing. Car lift cylinders typically operate at lower cycle frequencies than forklift cylinders but carry higher individual loads — 2,000 to 5,000 kg per cylinder.

Agricultural Platform and Table Lifts

Farm equipment including livestock handling platforms, grain bin floor lifts, and harvester header height-adjustment systems use single-acting lift cylinders with check valves for load holding during field operations. The sprocket system provides the stroke multiplication needed for long-travel lifts (1,500+ mm) within the limited cylinder envelope available on compact farm machinery. Agricultural environments demand the same environmental protection features (heavy chrome, dust wipers, corrosion coating) specified for the tractor steering cylinder range.

Industrial Scissor Lifts and Dock Levellers

Stationary scissor lift platforms and loading dock levellers use single-acting lift cylinders to raise the work surface. The integrated check valve holds the platform at the working height without continuous pump pressure. Loading dock levellers cycle 50–200 times per day, making seal longevity and drift resistance critical performance parameters — the same drift specification (≤ 25 mm in 10 minutes) that Korea Ever-Power applies to forklift lift cylinders is available on these custom lift cylinders.

Standard Catalogue vs Custom Lift Cylinder — Decision Guide

Korea Ever-Power offers both standard catalogue lift cylinders (5 fixed models with defined bore, stroke, and mounting) and this fully custom OEM platform. The decision between them depends on whether your application matches a standard specification or requires any degree of customisation.

Factor	Standard Catalogue	Custom OEM
Bore / Stroke	5 fixed options	Any dimension
Sprocket Configuration	Fixed sprocket profile	Custom tooth count, PCD, width
Check Valve Pressure	Factory preset	Set to your circuit pressure
Seal Brand	Korea Ever-Power standard	Parker / NOK / Hallite / any
Lead Time	Fastest (from stock)	3–6 weeks (prototype)
Unit Cost	Lowest	Higher (converges at volume)
Application Scope	Forklift mast only	Any lift mechanism

27-Component Assembly — Full Parts Inventory

Forklift-Short-Lifting-Hydraulic-Cylinder-Parts-1

#	Component	#	Component	#	Component
1	Cylinder Housing Assy	10	Guide Bush	19	Back-Ring
2	Piston	11	Sprocket Seat ◆	20	O-Ring
3	Oil Pipe ◆	12	Sprocket Cover ◆	21	O-Ring
4	Check Valve ◆	13	Spring Washers	22	Grease Nipple
5	Circlips for Hole	14	Hex Bolt	23	O-Ring
6	O-Ring	15	Du Bush	24	Washer
7	Wear-Ring	16	Back-Ring	25	Screws
8	Hole Seal	17	Rod Seal	26	Piston Rod
9	Round Wire	18	Dust Wiper	27	Plug

◆ Components unique to the integrated lift cylinder — not found in standard bare-actuator lift cylinders. All 27 components available as individual spare parts.

Custom Lift Cylinder — Frequently Asked Questions

Can the check valve cracking pressure be adjusted for different load weights?

Yes. The check valve cracking pressure is set during assembly by selecting the appropriate spring rate. For car lift applications handling 2,000 kg per cylinder, the cracking pressure is lower than for a forklift mast handling 3,500 kg. Specify the maximum static load the cylinder must hold, and Korea Ever-Power selects the spring that ensures the valve remains fully sealed under that load with an appropriate safety margin — typically 1.2× the maximum static pressure.

Is this cylinder suitable for a two-post car lift that must meet EN 1493 safety requirements?

The cylinder provides the hydraulic load-holding function required by EN 1493 (vehicle lifts — safety) through the integrated check valve. However, EN 1493 compliance requires additional safety devices beyond the check valve — typically a mechanical locking system (safety locks at each post) that holds the vehicle independently of the hydraulic system. The cylinder satisfies the hydraulic safety requirement; the car lift manufacturer must integrate the mechanical safety devices at the system level. Korea Ever-Power can provide the test certificate and pressure rating documentation needed for the lift manufacturer's EN 1493 conformity file.

Can the sprocket be omitted for applications that do not use chain drive?

Yes. The sprocket seat and sprocket cover (items 11–12) can be removed from the assembly for direct-drive applications where the piston rod pushes the platform directly without chain multiplication. In this configuration, the cylinder becomes a 25-component assembly (27 minus the 2 sprocket components) with the check valve and oil pipe retained. This is the typical configuration for car lifts and dock levellers where the cylinder acts directly on the lift mechanism without a chain intermediate.

What information do I need to provide for a custom lift cylinder quotation?

At minimum: bore diameter, rod diameter, stroke, working pressure, acting type (single or double), and whether the sprocket, check valve, and oil pipe are required. Additionally helpful: the maximum load the cylinder must support (for check valve spring selection), the chain specification (for sprocket tooth profile and PCD matching), the operating environment (indoor/outdoor/temperature range), the seal brand preference, and the annual volume estimate. Submit your requirements to Korea Ever-Power for engineering review and quotation.