Forklift Truck Steering Cylinder — 70mm Bore 178mm Stroke

Forklift Truck Steering Cylinder — 70mm Bore 178mm Stroke

Forklift truck steering cylinder. Bore 70mm, rod 40mm, stroke 178mm, installation distance 766mm. Double-acting rear axle steering for counterbalance forklifts. OEM-compatible replacement unit available in standard and custom configurations.

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Description

Forklift Truck Steering Cylinder — Specification and Application

The Forklift Truck Steering Cylinder is a hydraulic cylinder designed specifically for forklift truck service. Bore diameter 70mm, rod diameter 40mm, travel 178mm, installation distance 766mm — dimensions selected for the Rear axle steering — powered left/right wheel actuation function in counterbalance and industrial vehicle applications. The unit is built from high-strength alloy steel with a hard chrome piston rod, precision-honed bore, and a composite seal package rated for the operating pressure, contamination environment, and cycle count typical of forklift service.

Forklift Truck Steering Cylinder product view

Technical Specifications

Parameter Value Notes
Cylinder Diameter 70 mm Bore ID
Rod Diameter 40 mm Hard chrome plated
Travel (Stroke) 178 mm Full extension distance
Installation Distance 766 mm Pin-to-pin retracted
Function Rear axle steering — powered left/right wheel actuation Primary application function
Type Double-acting Specify if single-acting required
Surface Treatment Phosphate + enamel Corrosion-resistant exterior

Construction Standards

Alloy Steel Barrel

The 70mm bore barrel is machined from seamless alloy steel tube and honed to Ra 0.4–0.8 µm. This surface finish ensures the piston seal maintains consistent contact pressure across the full stroke, minimising internal bypass leakage across the cylinder’s service life.

Hard Chrome Piston Rod

The 40mm rod is hard chrome plated and ground to h6 dimensional tolerance. Chrome hardness exceeds 68 HRC, providing the wear and corrosion resistance required in forklift service environments — ranging from clean indoor warehouses to outdoor yards and cold stores with high humidity.

Composite Seal Package

Polyurethane piston seal, PTFE-backed rod seal, and nitrile rod wiper. The composite selection balances pressure retention, temperature range, and low friction. Seal kits are available separately for in-field gland rebuild without complete cylinder replacement.

Performance Advantages

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Precision Honed Bore

Consistent seal contact from first stroke to end of service life.

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Chrome Rod Protection

Hard chrome resists warehouse abrasion, moisture, and cleaning chemical exposure.

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100% Pressure Tested

Every cylinder tested to 1.5× working pressure before shipment.

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Field-Serviceable

Standard tooling gland access; seal kits supplied separately.

To request pricing for the Forklift Truck Steering Cylinder, custom specifications, or an OEM supply assessment, contact Hangzhou Ever-Power Hydraulic Cylinder Co., Ltd. at +86-571-88220653 or [email protected]. Our address is Shenhua Road, Hangzhou. Use the contact form for a response within one business day.

Frequently Asked Questions

1. What is the difference between the 70mm bore steering cylinder and the 65mm bore LS-HCZD30N-03? +
The larger 70mm bore develops higher steering force — appropriate for larger-capacity machines with heavier rear axle loads. The 40mm rod in this model (vs. 40mm in the LS-HCZD30N-03) is the same diameter but the longer installation distance (766mm vs. 676mm) serves a different mounting geometry. Verify bore, rod, stroke, and installation distance against your machine’s specification before ordering either model.
2. How long should a forklift steering cylinder last? +
Under normal operating conditions with clean hydraulic oil and no mechanical misalignment, a quality steering cylinder should last 5,000–10,000 hours or more. Premature failure is most commonly caused by: contaminated hydraulic oil abrading seals and bore, mechanical misalignment causing side-loading on the rod, or the machine being operated in corrosive environments without appropriate surface protection.
3. What is the 766mm installation distance used for in specification matching? +
Installation distance (pin-to-pin in the retracted position) determines where the cylinder can be mounted in the chassis. If the replacement cylinder has a longer installation distance than the original, it will not fit between the mounting points without chassis modification. Always verify installation distance, not just stroke and bore, when selecting a replacement cylinder.
4. Should I replace both steering cylinders at the same time? +
If the machine uses two steering cylinders (one each side of the rear axle), replacing both simultaneously when either requires service prevents a steering imbalance from developing as the older cylinder’s performance degrades. In single-cylinder steering designs, replace the single cylinder as required.
5. Is assembly documentation available for installation? +
Yes. An installation guide covering mounting alignment, port connection sequence, and initial bleed procedure is available on request. For complex steering geometries, our engineering team can advise on the correct installation procedure for your specific machine configuration.

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