Caterpillar 365C 326-4403 Stick Cylinder

Caterpillar 365C 326-4403 Stick Cylinder

The Caterpillar 365C cat 326-4403 arm cylinder is the exclusive, core hydraulic actuator for the Cat® 365C excavator. It is responsible for driving the arm's extension and retraction, ensuring operational precision and stability.
 

Product Video

 

 

 

 

Products Description

 

 

 

Brand

Product Name

Model

Weight/pc

Part Number

Caterpillar

CAT STICK CYLINDER 365C

46.36Kg

326-4403

 

 

 

Product Details

 

 

 

Product Name

CAT STICK CYLINDER

Part Number

326-4403

Origin

Japan

Brand Name

STONE

Model

365C 

Price

Negotiable

Packing Details

Standard Export Packing

Delivery Time

0-30 Days

Payment Term

L/C, T/T

Price Term

FOB, CIF, CFR

Supply Capacity

50,000 PCS/Month

Minimum Order Quantity

1 PC

Material

High Quality Steel

Technology

Precision Machining

Surface

Treatment Anti-Corrosion Coating

Hardness

HRC 48-52

Quality

Original Factory Standard

After-Sales Service

Full Support, Online Service

Color

Standard Caterpillar Yellow or Customizable

Application

Excavator

Customizable

including customized materials, surface treatment and specifications

 

 

 

Applicable Models

 

 

365B L

385C L

345C

 

 

 

Product advantages

 

 

 

Cat Stick Cylinder

Caterpillar  365C

Specifications:

Engine Model: Cat® C15 ACERT™

Net Flywheel Power: 302 kW

Operating Weight: 65960 kg

 

Track

Number of Shoes - Each Side - Long Undercarriage: 47

Number of Carrier Rollers - Each Side: 3

Number of Track Rollers - Each Side - Long Undercarriage: 8

 

 

High Strength, Durability, and Exceptional Load Resistance

 

The Cat stick cylinder barrel is precision-machined from high-strength ST 52 steel, and the piston rod undergoes special chrome plating. This effectively resists wear, corrosion, and impact, meets the demands of heavy-duty operations, and extends maintenance cycles.

Excellent Sealing Performance, Minimal Leakage Risk

Utilizes high-quality NOK  sealing components, paired with Caterpillar's proprietary seal groove design. This effectively prevents hydraulic oil leakage and blocks external contaminants like mud, sand, and dust from entering the cylinder, preventing hydraulic system contamination and component wear.

High Control Precision, Smooth and Efficient Operation

 

Based on precise machining and strict dimensional control, this Cat stick cylinder stroke is accurately controllable, and hydraulic flow pressure regulation is responsive. This enables smooth arm start-up, steady operation, and precise stopping-free from shock or stick-slip-effectively improving the excavator's operational precision. 

Strong OEM Compatibility, Easy and Hassle-Free Installation


Manufactured strictly according to OEM drawings, with dimensions and interfaces identical to the original part. It can be installed directly without modification and is perfectly compatible with the hydraulic system.

 

Work efficiency

 
cat stick cylinder

Drives Arm Movement, ensuring the Core Working Functions

As the primary power component for the arm, it efficiently converts hydraulic energy into linear mechanical force to extend and retract the arm, driving the bucket for digging, breaking, loading and material handling. It is critical for earthmoving, material transport and trench finishing, directly influencing work efficiency and operational quality.

Provides stable load support and enhances operational safety

In heavy-load scenarios like digging and lifting materials, this cat stick cylinder stably bears the load pressure from the arm and bucket, maintaining arm position. This prevents arm sagging or shaking due to excessive loads, avoiding safety hazards like material spillage or machine instability, thereby ensuring safety for both the operator and the equipment.

Cat Stick Cylinder
Cat Stick Cylinder

Adapts to Complex Conditions, Enhances Job Site Versatility

With excellent wear and corrosion resistance, it operates steadily in mining, construction waste processing, river dredging and other harsh conditions. It withstands abrasion from gravel and debris while adapting to wide temperature ranges and humid environments, maximizing machine versatility across applications.

Optimizes Power Transmission, Reduces Energy Loss

High hydraulic-mechanical conversion efficiency minimizes power loss during transmission, directing more usable force to the arm. This improves productivity while lowering fuel consumption. Smooth, low-shock operation also reduces overall machine wear, extending service life and lowering total operating costs.

Cat Stick Cylinder
 

 

 

Daily Maintenance Recommendations

 

 

Inspect seals and connections regularly for leaks

Perform weekly visual inspections of seal areas and hydraulic connections for oil leakage, seal degradation or damage. Replace with genuine-quality seals immediately if needed to prevent contamination and internal wear, and maintain proper hydraulic oil level.

Maintain clean and correctly specified hydraulic oil

Use high-grade anti-wear hydraulic oil; avoid mixing different brands or viscosity grades. Replace hydraulic oil and clean or replace filters every 6–12 months or 500–1000 operating hours. Monitor oil condition, clarity and level; change or top up oil if contaminated or low to protect internal cylinder components.

Clean and protect the piston rod routinely

Wipe the piston rod clean of mud, dust and debris after each shift to prevent scoring or seal damage. Inspect the rod surface for scratches, corrosion or pitting. Minor imperfections may be polished; severe damage requires timely repair or replacement to prevent further deterioration.

Standardized operation avoiding overload and shock

Do not exceed the arm's rated load capacity, and avoid striking rigid objects with the arm to prevent cylinder barrel deformation or piston rod bending. After startup, cycle the arm through full extension and retraction 5–10 times to bleed air and warm the hydraulic system, avoiding unloaded or overloaded operation.

 

 

STONE

 
CAT  Double Grouser Shoeproduct-15-15
 
 

Stone is a leading supplier of engineering machinery parts, focusing on providing high-quality parts for mining companies. Since its establishment in 2004, we have been based in Shanghai, China, and have built our own brand STONE, becoming a trusted choice in the industry. We are committed to providing a variety of parts including bulldozers, excavators and wheel loaders for well-known brands such as Caterpillar and Komatsu. Our product line covers a full range of OEM parts, such as Track Chain, Track Rollers, Sprocket, Excavator Buckets, Blades, Excavator Cylinders, Swing Circles, and various electrical and hydraulic components to ensure that our customers' stringent requirements for quality and performance are met.

 
Top

quality

 
20+

years experience

 
Customizd

service

 
2000+

hours warrant

 

 

Q&A

 
 

 

Cat Stick Cylinder

Can the 365C Cat stick cylinder be interchanged with other excavator models?

No. This cylinder is engineered specifically for the Cat 365C with matched dimensions, mounting geometry and hydraulic characteristics. It is not compatible with other excavator models or other Cat series due to dimensional and performance differences. Forced installation may cause power mismatch, premature wear and safety risks.

 

What is the typical service life, and how can it be extended?

Under proper operation and regular maintenance, service life can exceed 20,000 operating hours, varying by working conditions and maintenance frequency. To maximize life, follow recommended maintenance practices, avoid abusive operation and address minor issues promptly.

Is adjustment required after cylinder replacement, and what should be noted?

Basic commissioning is recommended. After installation, fill with approved hydraulic oil, start the engine and cycle the cylinder fully to purge air. Verify smooth operation, no binding or leakage, and confirm proper arm function and system pressure before returning to service. Avoid aggressive operation and keep pressure within rated limits to prevent component damage.
 

 

 

 

 

 

 

 

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