Telehandler Hydraulic Cylinders

Tonghesheng Machinery is one of the competitive manufacturers and suppliers of high-quality telehandler hydraulic cylinders, and we are also equipped with a professional factory, welcome to buy telehandler hydraulic cylinders products from our company.

 

Telehandler hydraulic cylinders deliver linear motion and pressure control for heavy-duty material handling equipment. Specifically engineered for telescopic handlers (reach forklifts), these double-acting welded cylinders manage main boom lifting, multi-stage boom extension, frame leveling, steering, and attachment tilting under severe dynamic loads.

Operating in high-vibration construction, agricultural, and industrial environments, these cylinders incorporate high-tensile alloy steel tubes, hardened chromed piston rods, and multi-stage sealing packages to prevent drift, external leakage, and premature wear during continuous duty cycles.

 

 

Specification Parameter	Standard Range / Capability
Bore Size Range	40 mm – 250 mm (1.5" – 10")
Rod Diameter Range	25 mm – 160 mm (1.0" – 6.3")
Maximum Stroke Length	Up to 6,000 mm (236")
Working Pressure	21 MPa – 35 MPa (3,000 psi – 5,000 psi)
Test Pressure	Up to 50 MPa (7,250 psi)
Operating Temperature	-40°C to +105°C (-40°F to +221°F)
Cylinder Tube Material	E355, ST52, or 27SiMn seamless honed steel tube
Piston Rod Material	42CrMo, 40Cr, or C45 steel; induction hardened & hard chrome plated
Chrome Plating Layer	25 – 50 µm thickness; Salt Spray Test rating > 96 hours (ASTM B117)
Seal System	Parker, Hallite, NOK, or Trelleborg urethane step seals & U-cups
Mounting Types	Spherical bearings, steel clevis, trunnion, or cross-tube with grease zerk
Fluid Compatibility	Mineral oil, synthetic ester, water-glycol hydraulic fluids

 

 

High Yield Strength Barrel: Cold-drawn seamless honed steel tubing withstands peak pressure spikes up to 35 MPa without permanent deformation.
Induction-Hardened Chrome Rod: Piston rods undergo surface induction hardening (HRC 52–58) up to 2–3 mm depth prior to chrome plating, resisting abrasive dust, impact denting, and corrosion.
Drift-Free Sealing Architecture: Low-friction PTFE step seals paired with polyurethane U-cups eliminate internal bypass, maintaining precise boom position under holding loads.
Integrated Valve Blocks: Direct-flanged counter-balance (load-holding) valves eliminate external hydraulic lines, preventing boom collapse during sudden hose failure.
Heavy-Duty Rod Wiper Seals: Double-lip metal-cased wipers actively clear mud, ice, and concrete debris during rod retraction to extend internal seal life.

 

 

Telehandler hydraulic systems present distinct structural and fluid dynamics challenges that dictate cylinder design:
Side-Load Mitigation
Challenge: Multi-stage boom extension creates long moment arms, inducing severe side loads on the cylinder rod when carrying rated capacity at full forward reach.
Design Solution: Wide duct-type bronze or high-load glass-filled nylon guide rings distribute lateral forces along the rod gland, reducing stress concentration on seal lips and preventing rod scoring.
Thermal Expansion & Holding Pressure
Challenge: Extended outdoor operation causes thermal expansion of trapped hydraulic oil, raising internal pressure while holding heavy suspended loads.
Design Solution: Thermal relief cavities and integrated counterbalance valves regulate pressure spikes and ensure smooth, chatter-free lowering under full boom weight.
Synchronized Telescoping Motion
Challenge: Multi-section booms require exact staging sequence to prevent kinetic binding or uneven extension speed.
Design Solution: Internal bypass ports, pilot-operated sequencing logic, or internal linear displacement transducers (LDT) provide real-time positioning feedback to the machine ECU.

 

 

Main Lift Cylinders: Positioned at the rear chassis to pivot the main boom assembly up to 70 degrees under maximum load.
Telescopic Extension Cylinders: Mounted inside or alongside the boom sections to extend reach up to 18 meters; features long stroke-to-bore ratios.
Tilt (Attachment) Cylinders: Mounted at the boom tip to control forks, buckets, or grapples; designed for quick dynamic forward and backward tilt cycling.
Frame Leveling Cylinders: Connected to the front axle assembly to keep the chassis level when operating on uneven terrain.
Outrigger / Stabilizer Cylinders: Vertical hydraulic jacks fitted with internal check valves to establish a stable footprint on job sites.

 

 

Our manufacturing workflow follows strict quality control protocols at every stage of production:
Raw Material Inspection: Every batch of raw seamless tubing and alloy steel bar stock undergoes strict material verification and comes with EN 10204 3.1 Mill Test Reports (MTR).
Precision Honing & Machining: Seamless tubes undergo CNC skiving and roller burnishing to achieve an ultra-smooth bore finish with internal surface roughness Ra <= 0.2 um.
Rod Processing & Hardening: Alloy steel bars are turned, threaded, surface induction hardened, and finished with hard chrome plating to enhance wear resistance.
Robotic Welding: End caps and port blocks are joined using automated robotic MIG or friction welding setups to ensure uniform weld integrity and penetration.
Cleanroom Assembly: Seal kits and rod glands are assembled in an ISO Class 7 cleanroom environment to eliminate particle contamination.
Testing & Finishing: Completed cylinders undergo 100% hydrostatic pressure testing and internal leakage checks before proceeding to multi-coat painting and export packaging.

 

 

Every manufactured cylinder undergoes 100% factory acceptance testing before dispatch, covering three primary evaluation stages:
Proof Pressure Test: Hydrostatic pressure is applied at 1.5 times the rated working pressure for a minimum 5-minute hold to ensure structural integrity without deflection.
Internal Leakage (Bypass) Test: High-pressure oil is applied to evaluate seal performance over a 10-minute hold period, verifying zero pressure drift.
Fluid Cleanliness Verification: Hydraulic fluid cleanliness is measured against the ISO 4406 18/16/13 standard via particle count checks before oil drainage and port sealing.

 

 

To receive an accurate technical proposal and commercial quote within 24–48 hours, provide the following parameters:

Parameter	Buyer Requirement / Specification
1. Application Type	(e.g., Main Lift / Extension / Tilt / Leveling)
2. Bore Size & Rod Diameter	mm or inches
3. Stroke Length	mm or inches
4. Pin-to-Pin Distance (C2C)	mm or inches (Retracted / Extended)
5. Working & Peak Pressure	MPa or psi
6. Dynamic Holding Load	kN or lbs
7. Mounting Configuration	(e.g., Spherical Bearing, Clevis, Cross-tube)
8. Porting & Valve Specs	Port size, type, and manifold block requirements
9. Environmental Conditions	Operating temperature, salt spray exposure
10. Estimated Quantity	Prototype sample / Annual volume (EAU)

 

 

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