Industrial Vehicle Short Stroke Forklift Lift Cylinder

Forklift Short Lifting Hydraulic Cylinder 1

Short stroke is not a limitation — it is a design choice. When the mast must fit through a doorway, when the free-lift stage must operate within the collapsed inner rail height, or when the overhead clearance sets an absolute limit on cylinder extension, the lift cylinder’s stroke is deliberately restricted to a short range and the chain sprocket multiplies that short extension into the full carriage travel required. Korea Ever-Power manufactures this short stroke lift cylinder as an OEM custom product — the stroke, bore, sprocket configuration, and check valve setting are engineered to match your mast geometry. 27-component architecture with integrated safety check valve, oil pipe, and chain sprocket. 45 kg reference weight. ISO 9001 certified. MOQ 1 piece.

التصنيف: Forklift Hydraulic Cylinders

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معلومات إضافية

SHORT STROKE
27 PARTS
OEM CUSTOM

Industrial Vehicle Short Stroke Lift Cylinder

Every multi-stage forklift mast contains at least one short stroke lift cylinder — the inner cylinder that provides free-lift travel before the mast rails begin to separate. Its stroke is typically 500–900 mm — less than half the main lift cylinder's 1,500 mm — because it operates entirely within the collapsed height of the innermost mast rail. Making it any longer would increase the retracted mast height and defeat the purpose of a compact multi-stage design. Korea Ever-Power builds this cylinder as an OEM custom product with 27 integrated components — check valve, oil pipe, and chain sprocket included — because each mast design has unique rail lengths, chain ratios, and clearance constraints that dictate a unique cylinder stroke.

Short

Stroke Design

Components

45 kg

Ref. Weight

OEM

Custom Build

1 pc

MOQ

Why Short Stroke — The Engineering Logic Behind Limited-Travel Lift Cylinders

The term "short stroke" sometimes creates the impression of a compromise — a cylinder that cannot reach as far as a "normal" one. In reality, the short stroke is an engineering decision driven by the physical constraint of the mast envelope. The cylinder's retracted length (closed length) plus its stroke must fit within the inner rail's collapsed height. A longer stroke would require a taller inner rail, which would require a taller outer rail, which would increase the overall mast height and reduce the forklift's ability to enter low-clearance buildings, shipping containers, and multi-storey car parks.

Forklift Short Lifting Hydraulic Cylinder 1

The Space Constraint

A triplex mast with 6,000 mm maximum lift height has a collapsed height of approximately 2,200 mm. The short lift cylinder must fit entirely within the inner channel — typically 1,800–2,000 mm of available space. Subtracting mounting hardware and the piston assembly leaves approximately 700–900 mm for usable stroke. This is not a design compromise — it is a dimensional fact dictated by the mast geometry.

The Chain Multiplier

The chain sprocket on the piston rod creates a 2:1 stroke multiplication. When the cylinder extends 800 mm, the carriage rises 1,600 mm — the chain doubles the travel. This means a short stroke cylinder with an 800 mm stroke delivers the same carriage travel as a hypothetical 1,600 mm direct-acting cylinder, but fits in half the vertical space. The sprocket is not an accessory — it is the mechanism that makes the short-stroke / compact-mast design possible.

Where the Short Stroke Cylinder Operates in the Mast Staging Sequence

Understanding the lift sequence of a multi-stage mast explains why the short stroke cylinder exists, when it operates, and why its stroke cannot be changed independently of the mast design.

STAGE 1

Free Lift (Short Stroke Cylinder)

The short stroke cylinder extends first, raising the carriage and forks inside the collapsed mast. The mast rails do not move — the overall mast height stays constant. This allows the operator to raise the forks to pick up a pallet without increasing the forklift's overall height. Free-lift travel is typically 150–300 mm of actual fork rise (75–150 mm of cylinder stroke × 2 chain ratio).

STAGE 2

Full Free-Lift (Short Stroke Continues)

The short stroke cylinder continues to extend through its remaining stroke. The carriage continues to rise inside the still-collapsed mast. On a Full Free-Lift (FFL) triplex mast, this stage provides 1,200–1,600 mm of carriage rise (600–800 mm cylinder stroke × 2) — enough to lift a pallet to the first shelf level of a standard warehouse rack without any mast extension.

STAGE 3

Mast Extension (Main Lift Cylinder)

Once the short stroke cylinder reaches full extension, hydraulic flow transfers to the main lift cylinders (one per mast channel). The mast rails now begin to telescope — each stage extending sequentially until the carriage reaches maximum lift height. The main lift cylinders have 1,500 mm strokes to cover the remaining lift range. The short stroke cylinder remains fully extended and acts as a structural column during this phase.

Product Specification

Product Type	Custom short stroke lift cylinder for industrial vehicles and forklifts
Acting Type	Single-acting (standard) / Double-acting available
Architecture	27 components — 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% tested + video inspection + machinery test report
Service / MOQ	OEM + ODM / 1 piece
Annual Capacity	1,200,000 cylinders / year (all product types)
Shipping	Crate or pallet · Port: Shanghai / Ningbo

Stroke Selection Engineering — How to Determine the Correct Short Stroke Length

The stroke length of a short lift cylinder is not a product specification that the buyer selects from a menu — it is an output of the mast design calculation. Changing the stroke by even 10 mm changes the free-lift height, the mast collapsed height, and the chain tension at maximum load. The following parameters must be defined before the stroke can be calculated.

types-of-hydraulic-cylinders-1

Design Input	How It Affects Stroke
Inner Rail Collapsed Height	Sets the maximum retracted length of the cylinder. Stroke = rail height − closed length − mounting hardware − clearance.
Required Free-Lift Height	Determines the minimum stroke. Free-lift height ÷ chain ratio (2:1) = minimum stroke. E.g., 1,400 mm free-lift ÷ 2 = 700 mm minimum stroke.
Chain Ratio	Standard 2:1. Some heavy-duty masts use 3:1 or 4:1 compound sheaves, which reduce the required stroke proportionally but increase chain tension.
Mast Type (Duplex / Triplex)	Duplex masts use longer short-stroke cylinders (longer inner rail). Triplex masts use shorter short-stroke cylinders (shorter inner rail with 3-stage telescoping).
Bore Diameter	Does not directly set the stroke, but bore affects the piston assembly length, which reduces the available stroke within the inner rail space.

For OEM mast designers:
Provide the inner rail length, the required free-lift distance, and the chain configuration. Korea Ever-Power calculates the cylinder stroke, bore, and closed length to fit the mast geometry exactly — accounting for piston assembly length, sprocket protrusion, check valve housing depth, and rod end clearance.

27-Component Assembly

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

◆ Integrated subsystem components — check valve (load holding), oil pipe (internal flow routing), sprocket seat and cover (chain drive). All 27 components available as individual spare parts.

Short Stroke Lift Cylinder — Technical Questions

How does this OEM short stroke cylinder differ from the standard short lift models?

The standard short lift range offers 5 fixed models with predefined bore (Φ75–Φ95), stroke (775–800 mm), and sprocket geometry. This OEM product has no fixed dimensions — bore, stroke, sprocket profile, check valve setting, and mounting hardware are all manufactured to your specification. Choose the standard models when they match your mast design exactly. Choose the OEM product when any parameter deviates from the standard offering, or when your mast is a new design that requires a purpose-built cylinder.

Can the stroke be increased to gain more free-lift height without changing the mast design?

Not without consequences. Increasing the stroke means the cylinder's retracted length plus its new stroke must still fit within the inner rail. If the inner rail length is fixed, a longer stroke requires a shorter closed length — which means a shorter piston assembly, reduced guide length, and potentially compromised column stability. Alternatively, the stroke increase can be accommodated by changing to a 3:1 chain ratio with a compound sheave, which gains free-lift height without changing the cylinder stroke. Contact Korea Ever-Power with your mast dimensions for a free-lift height optimisation analysis.

What causes the forks to creep down slowly during free-lift holding?

Fork creep during free-lift holding is caused by internal oil bypass past the piston seal or a leaking check valve — the same two mechanisms that cause fork drift on any lift cylinder. On the short stroke cylinder, the check valve is the more common culprit because it is internal and difficult to inspect without disassembly. The specification for acceptable drift is ≤ 25 mm of fork descent in 10 minutes at rated load, measured with the control valve in neutral. If drift exceeds this limit, service the check valve first — debris on the valve seat accounts for approximately 60% of drift complaints on short stroke cylinders.

Can this cylinder be used for applications outside forklift masts?

Yes. Any application requiring a lift cylinder with limited available vertical space — scissor lift platforms, agricultural elevators, dock levellers, compact goods lifts, and vehicle-mounted crane pedestals — can use this architecture. The integrated check valve provides load holding, the sprocket provides stroke multiplication, and the OEM custom service adapts the dimensions to the specific installation envelope. The 27-component design is not forklift-specific — it is a universal short-stroke lift cylinder platform that happens to have its highest volume application in forklift masts.