Shipment Update: 311-9550 20R-3300 New Replacment Caterpillar Fixed Displacement Hydraulic Piston Motors

Shipment Update: 311-9550 20R-3300 New Replacment Caterpillar Fixed Displacement Hydraulic Piston Motors

NINGBO, China – September 8, 2026 — PHPFluid has completed full quality inspection, standardized export packaging and official shipment of new replacement CAT 311-9550 (20R-3300) fixed displacement hydraulic piston motors. This batch is customized to meet the strict quality standards and high durability requirements of European and North American heavy equipment aftermarket clients, serving local professional equipment distributors, authorized repair workshops and large construction fleet operators.

This CAT 311-9550 20R-3300 hydraulic motor is a high-precision fixed-displacement axial piston motor, specially designed for the cooling fan drive system of Caterpillar large-scale excavators. Different from ordinary hydraulic motors, this model features stable constant-speed output, strong high-temperature resistance and ultra-low failure rate, fully complying with EU mechanical safety regulations and North American heavy-duty equipment operation standards, which is the core preferred replacement part for regional after-sales maintenance.

Complete Product Technical Parameters (CAT 311-9550 20R-3300)

• Official Part Numbers: 311-9550 / 3119550, 20R-3300 / 20R3300

• Pump Type: Fixed Displacement Axial Piston Hydraulic Motor

• Overall Dimension: 253.5mm (L) × 174mm (W)

• Net Weight: 21.7kg (47.89lbs)

• Core Material: High-strength alloy steel + imported wear-resistant piston pair

• Sealing System: High-temperature resistant composite NBR seals, anti-aging and anti-leakage

• Working Temperature Range: -25°C ~ +85°C (-13°F ~ +185°F)

• Processing Standard: ISO 4413 hydraulic system certification, fully consistent with OEM performance parameters

• Quality Grade: New aftermarket premium replacement, zero assembly modification required

Professional Application Scenarios

This hydraulic piston motor is exclusively applicable to the cooling fan drive system of Caterpillar large mining and construction excavators, perfectly matching the following classic models:

• Caterpillar EXCAVATOR 374D L: Matches C15 engine cooling system, ensures continuous heat dissipation during long-term high-load mining operations

• Caterpillar MOBILE HYD POWER UNIT 365C L: Standard fan drive component, adapts to high-temperature and dusty harsh construction environments

It is widely used in European and North American local infrastructure construction, open-pit mining, municipal engineering and large equipment fleet daily maintenance scenarios. The stable constant-speed operation effectively solves the problems of fan stalling, insufficient heat dissipation and engine overheating failure of old equipment, greatly extending the service life of CAT large excavators.

Quality & Shipment Details

To cater to the high-quality pursuit of European and American customers for hydraulic components, every CAT 311-9550 motor has passed strict factory bench tests, including full-pressure endurance test, speed stability test and sealing leakage test, with 100% qualified performance. Adopting EU-standard export packaging with moisture-proof, dust-proof and shock-proof reinforcement, it effectively avoids structural damage and precision part deviation during transoceanic long-distance transportation.

As a professional supplier of premium aftermarket hydraulic parts, PHPFluid always adheres to European and American high-end quality standards. We maintain sufficient spot inventory of CAT series hydraulic motors, piston pumps and supporting accessories, providing global clients with OEM-equivalent quality, cost-effective pricing and fast delivery cycle.

About PHPFluid

Ningbo PHP Hydraulics Co., Ltd. (PHPFluid) focuses on aftermarket hydraulic replacement parts for construction machinery. We supply high‑quality piston pumps, vane pump cartridge kits, hydraulic motors and related spare parts for heavy‑equipment distributors and service partners across North America, Latin America and global markets, balancing dependable quality and competitive total‑cost‑of‑ownership for end‑users.

As a professional global supplier of aftermarket hydraulic components, focuses on offering high-quality replacement pumps, motors and spare parts for mainstream brands including Rexroth, Danfoss, Vickers, Caterpillar, Volvo, Kawasaki, Komatsu, and other major brands.

Inquiry CTA

For inquiries and customized quotations of Caterpillar series hydraulic piston pumps, motors and other aftermarket hydraulic spare parts, please feel free to contact our professional sales team.

Pls contact us directly by：

Tel./WhatsApp/WeChat: +86 138 6780 9523

Email: wfu@phpfluid.com

we can discuss the details, thanks.

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