✅ ENGLISH Keywords (15) Hydraulic Service Trolley HST-300U Mobile Hydraulic Ground Support Unit Aircraft Hydraulic Service Cart Portable Hydraulic Test and Service Unit Ground Hydraulic Maintenance Equipment Aerospace Hydraulic Service Trolley Hydraulic Power Unit on Wheels HST-300U GSE Hydraulic Cart Mobile Fluid Servicing Unit High-Pressure Hydraulic Testing Trolley Hydraulic Flushing and Charging Cart Aircraft Line Maintenance Hydraulic Unit Portable Hydraulic Pressure Test Stand Self-Contained Hydraulic Support Unit Mobile Hydraulic Fluid Handling System 🇸🇦 ARABIC (العربية) (15) عربة خدمة هيدروليكية HST-300U وحدة دعم أرضي هيدروليكية متنقلة عربة خدمة هيدروليكية للطائرات وحدة اختبار وصيانة هيدروليكية محمولة معدات صيانة هيدروليكية أرضية عربة خدمة هيدروليكية للطيران وحدة طاقة هيدروليكية على عجلات عربة GSE هيدروليكية HST-300U وحدة تزويد بالسوائل الهيدروليكية متنقلة عربة اختبار ضغط هيدروليكي عالية عربة شحن وتنظيف هيدروليكي وحدة صيانة هيدروليكية للطائرات منصة اختبار ضغط هيدروليكي محمولة وحدة دعم هيدروليكية متكاملة نظام محمول لمعالجة السوائل الهيدروليكية 🇩🇪 GERMAN (Deutsch) (15) Hydraulik-Servicewagen HST-300U Mobile Hydraulikeinheit für Bodendienst Hydraulikwagen für Flugzeugwartung Tragbare Hydrauliktest- und Serviceeinheit Bodengestützte Hydraulikwartungsausrüstung Hydraulik-Servicetrolley für Luftfahrt Mobile Hydraulikleistungsstation HST-300U GSE Hydrauliksystem Hydraulik-Flüssigkeitswartungseinheit Prüfwagen für Hochdruckhydraulik Hydraulikspül- und Ladegerät Mobile Serviceeinheit für Flugzeuge Tragbares Hydraulik-Prüfstandsystem Selbstständige Hydraulikversorgungseinheit Mobiles System zur Hydraulikflüssigkeitsbehandlung 🇫🇷 FRENCH (Français) (15) Chariot de service hydraulique HST-300U Unité mobile de support hydraulique Chariot hydraulique pour maintenance avion Unité de test et service hydraulique portable Équipement d’entretien hydraulique au sol Chariot de service hydraulique aéronautique Unité hydraulique mobile sur roues Chariot GSE hydraulique HST-300U Unité de gestion de fluide hydraulique mobile Chariot d’essai hydraulique haute pression Unité de purge et remplissage hydraulique Système de maintenance hydraulique pour avions Station d’essai hydraulique mobile Unité autonome de support hydraulique Système mobile de traitement de fluide hydraulique 🇪🇸 SPANISH (Español) (15) Carrito de servicio hidráulico HST-300U Unidad móvil de soporte hidráulico terrestre Carro de servicio hidráulico para aeronaves Unidad portátil de prueba y servicio hidráulico Equipo de mantenimiento hidráulico terrestre Carrito hidráulico para uso aeroespacial Unidad de potencia hidráulica móvil Carrito GSE hidráulico HST-300U Sistema móvil de servicio de fluidos Carro de prueba hidráulica de alta presión Unidad de lavado y carga hidráulica Sistema portátil de mantenimiento hidráulico Plataforma de prueba hidráulica móvil Unidad autónoma de soporte hidráulico Sistema móvil de manejo de fluido hidráulico 🇨🇳 CHINESE (Simplified 中文) (15) 液压服务小车 HST-300U 移动式液压地面支援设备 飞机液压维修车 便携式液压测试和服务单元 地面液压维护设备 航空用液压服务车 带轮液压动力装置 HST-300U 地面支援液压车 移动式液压液体服务单元 高压液压测试车 液压冲洗与加注设备 飞机现场维修液压服务单元 移动液压压力测试平台 自供式液压支援装置 移动液压油处理系统 🇯🇵 JAPANESE (日本語) (15) 油圧サービス台車 HST-300U モバイル油圧地上支援装置 航空機用油圧サービスカート 携帯型油圧テストユニット 地上油圧メンテナンス装置 航空宇宙向け油圧サービス台車 車輪付き油圧パワーユニット GSE油圧カート HST-300U モバイル油圧流体処理ユニット 高圧油圧試験用カート 油圧洗浄および充填ユニット 航空機ライン保守用装置 携帯型油圧圧力テスト装置 自立型油圧支援ユニット 移動式油圧流体ハンドリングシステム 🇷🇺 RUSSIAN (Русский) (15) Гидравлическая тележка HST-300U Мобильная гидравлическая наземная поддержка Тележка для обслуживания гидросистем самолетов Портативная установка для испытаний и обслуживания Наземное оборудование для гидравлического сервиса Гидравлический сервисный агрегат для авиации Гидравлический блок на колесах Тележка ГСЭ HST-300U Мобильная система обслуживания рабочей жидкости Тележка для испытания гидросистем высокого давления Тележка для промывки и зарядки жидкостью Обслуживающая гидросистема для авиалиний Передвижная установка для теста давления Автономный гидросервисный модуль Мобильная установка для обращения с гидрожидкостью 🇮🇳 HINDI (हिन्दी) (15) हाइड्रोलिक सेवा ट्रॉली HST-300U मोबाइल हाइड्रोलिक ग्राउंड सपोर्ट यूनिट विमानन हाइड्रोलिक सर्विस यूनिट पोर्टेबल हाइड्रोलिक टेस्ट और सेवा डिवाइस ग्राउंड हाइड्रोलिक मेंटेनेंस ट्रॉली एयरोस्पेस हाइड्रोलिक सर्विस ट्रॉली पहियों वाली हाइड्रोलिक पावर यूनिट GSE हाइड्रोलिक ट्रॉली HST-300U मोबाइल फ्लूइड सर्विसिंग सिस्टम उच्च दबाव हाइड्रोलिक परीक्षण ट्रॉली हाइड्रोलिक फ्लशिंग और चार्जिंग यूनिट एयरक्राफ्ट लाइन मेंटेनेंस हाइड्रोलिक डिवाइस पोर्टेबल हाइड्रोलिक टेस्टिंग प्लेटफार्म सेल्फ-कंटेंड हाइड्रोलिक सर्विस यूनिट मोबाइल हाइड्रोलिक फ्लूइड हैंडलिंग सिस्टम

Hydraulic Service Trolley-(HST-300U)

About

The Universal Hydraulic Servicing Trolley (HST 300U) is an advanced aircraft ground support system designed for hydraulic servicing, maintenance, and testing of fighter jets, military transport aircraft, and helicopters. It provides continuous, high-pressure, filtered hydraulic oil supply to two aircraft simultaneously, ensuring safe and efficient operation during maintenance. Equipped with a pressurized hydraulic reservoir, vacuum-based de-aeration, compressed air system, and precise pressure control, the HST 300U is ideal for aircraft maintenance facilities, MRO operations, and military airbases.
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Technical Details

  • Operation : Outdoor
  • Dimensions : 3400 mm (L) × 1500 mm (W) × 1690 mm (H)
  • Fuel Tank Capacity : 140 Liters
  • Hydraulic Flow Rate : 100 LPM per system
  • Operating Pressure : 300 Bar
  • Temperature Range : -5°C to 50°C
  • Vacuum Level : 200mBar (abs)
  • Compressed Air Pressure : 7 Bar (Max)
  • Filtration Level : 3μ
  • Hydraulic Oil Compatibility : OM-15, DTD-585, MIL-H-5606
  • Reservoir Material : SS304L Stainless Steel
  • Power Source : Greaves TBD3V6 Diesel Engine
  • Battery System : 2 × 12V, 120Ah Lead Acid Batteries
  • Gross Vehicle Weight (GVW) : 3830 Kg
  • Towing Speed : 10 km/h
  • Suspension System : Leaf Spring (Front & Rear)
  • No. Of supply & Return lines : 2 set of Delivery and Return Line (Including System-I and System-II).
  • Rear Axle Weight (RAW) : 2205 Kg (Actual Measurement DATED 13/07/2012)
  • Front Axle Weight (FAW) : 1625 Kg. (Actual Measurement DATED 13/07/2012)
The Universal Hydraulic Service Trolley is specially designed and developed for the Ground Servicing of two independent aircraft systems. It is used for actuation of the aircraft hydraulic system through the supplied pressurized hydraulic oil from the trolley to the aircraft, comprising of a pressurized reservoir, with filtered and de-aerated fluid at flow and pressure characteristics required for testing. The Trolley (HST300U) is suitable for wide range of fighter aircraft, military transport aircraft, and helicopters used in Indian Air Force.
It is mainly used for Sukhoi Su-30MKI, MIG -29, MIG- 21, Mirage-2000, Hal- Tejas.

Key Features

  • Continuous filtered high pressure hydraulic oil supply to two independent aircraft systems.
  • Delivery Pressure & flow can be sleeplessly controlled from the panel.
  • System regulates the hydraulic fluid level in each system of aircraft
  • There is a provision of degassing through vacuum system.
  • Enables to decrease or increase the level of aircraft reservoir at quantitative volume of oil.
  • Instrumentation of different parameters like delivery pressure boost pressure, return pressure, delivery flow, temperature etc.
  • Trolley tank can be completely isolated and aircraft tank can be used in the circuit and including both tanks in the circuit is also possible.

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Details

The Universal Hydraulic Servicing Trolley (HST 300U) is an advanced ground support system designed for servicing the hydraulic systems of military aircraft, fighter jets, transport planes, and helicopters. This state-of-the-art hydraulic trolley provides a continuous, filtered, high-pressure hydraulic oil supply, ensuring the safe and efficient operation of aircraft hydraulic components during maintenance and testing. Engineered for versatility and reliability, the HST 300U is capable of servicing two independent aircraft systems simultaneously. It features a pressurized reservoir, precise pressure and flow
control, vacuum-based de-aeration, and a fully integrated compressed air system, making it an essential tool for aircraft maintenance, repair, and overhaul (MRO) operations.

Key Features & Capabilities
1. Main Hydraulic System
The HST 300U delivers a continuous, high-pressure hydraulic oil supply to two independent aircraft systems. The flow rate is 100 liters per minute (LPM) per system, and the operating pressure is 300 Bar. The system is compatible with OM-15, DTD-585, and MIL-H-5606 mineral-based hydraulic oils.
The trolley is equipped with a precise flow and pressure control system, adjustable via a panel-mounted relief valve and an aircraft-specific selector switch. It also includes a vacuum pump system that removes trapped air and moisture from the hydraulic circuit, ensuring fluid purity and system longevity.

2. Static Pressure (Hand Pump) System
The hand pump system enables manual filling of aircraft hydraulic reservoirs, generating up to 350
Bar pressure per stroke. This ensures safe and controlled fluid transfer.

3. Engine-Driven Vacuum System
The vacuum system plays a crucial role in de-aerating the hydraulic circuit and maintaining fluid cleanliness. It operates at a vacuum level of 200mBar (absolute), ensuring that moisture and air bubbles are effectively removed from the hydraulic system. A solenoid valve mechanism allows for automatic activation and venting.

4. Engine-Driven Compressed Air System
The HST 300U includes an integrated compressed air system, capable of delivering air at a maximum pressure of 7 Bar. The buffer chamber design ensures controlled air supply, making it suitable for pressurizing aircraft hydraulic reservoirs.

5. Hydraulic Reservoir & Filtration
The hydraulic system is equipped with a twin-chamber stainless steel (SS304L) reservoir, with a total capacity of 140 liters (70L + 70L). It features a 3-micron (μ) high-pressure filtration system, ensuring clean, contaminant-free hydraulic fluid. Additionally, the system allows for independent oil sampling, providing real-time monitoring of fluid conditions.

6. Power & Mobility
The HST 300U is powered by a Greaves TBD3V6 diesel engine, ensuring reliable and continuous operation. It uses two 12V, 120Ah lead-acid batteries, providing sufficient power for all electrical components. For mobility, the trolley features an Ackerman steering mechanism, allowing smooth maneuvering. It is equipped with four wheels (two front and two rear), supported by a leaf spring suspension system for stability on rough terrain. The maximum towing speed is 10 km/h, making it easy to move within maintenance facilities.

7. Hose & Connection System
The hydraulic servicing trolley is equipped with a comprehensive set of hoses:
• Two pressure hoses (1-1/4") – 20 meters each
• Two return hoses (1-1/4") – 20 meters each
• One additional pressure hose (1/4") – 20 meters
A turbine-type digital flow meter provides real-time monitoring of hydraulic flow rates.

Technical Specifications
• Operation Type: Designed for outdoor operation
• Dimensions: 3400 mm (L) x 1500 mm (W) x 1690 mm (H)
• Fuel Tank Capacity: 140 Liters
• Flow Rate: 100 LPM per system
• Operating Pressure: 300 Bar
• Temperature Range: -5°C to 50°C
• Vacuum Level: 200mBar (abs)
• Compressed Air Pressure: Up to 7 Bar
• Filtration Level: 3 Microns (High-Pressure Filter)
• Hydraulic Oil Compatibility: OM-15, DTD-585, MIL-H-5606
• Reservoir Material: Stainless Steel SS304L (Twin Chamber, 140L Total Capacity)
• Power Source: Greaves TBD3V6 Diesel Engine
• Battery System: Two 12V, 120Ah Lead Acid Batteries
• Gross Vehicle Weight (GVW): 3830 Kg
• Towing Speed: 10 km/h
• Suspension System: Leaf Spring (Front & Rear)

Applications of HST 300U
The Universal Hydraulic Servicing Trolley (HST 300U) is an essential ground support tool for military, defense, and aviation sectors. It is widely used for:
1. Military Aircraft Maintenance & Testing
• Actuating and testing hydraulic systems in fighter jets, transport aircraft, and helicopters.
• Performing landing gear, brake system, and flap control tests.
• Hydraulic fluid flushing and contamination removal.

2. Fighter Jets & Military Transport Aircraft
• Compatible with a wide range of military aircraft, including:
  o Sukhoi Su-30MKI
  o Mirage 2000
  o HAL Tejas
  o C-130J Super Hercules
  o Boeing C-17 Globemaster III
  o Mi-17 Helicopters

3. Aerospace Manufacturing & MRO Operations
• Used for hydraulic system testing during aircraft assembly and maintenance.
• Ensures fluid cleanliness and pressure accuracy in MRO (Maintenance, Repair, and Overhaul) facilities.

4. Defense & Air Force Bases
• Field-deployable unit for emergency hydraulic servicing.
• Used in remote air bases, aircraft carriers, and forward-operating bases.

5. Commercial & Civil Aviation
• Can be adapted for commercial aircraft hydraulic servicing.
• Ideal for flight-readiness checks and pre-flight testing.

Why Choose HST 300U?
• Dual Aircraft Servicing – Supports two aircraft simultaneously.
• Advanced Filtration & De-Aeration – Ensures clean and moisture-free hydraulic fluid.
• Heavy-Duty, Reliable Design – Built for military-grade durability.
• Precise Flow & Pressure Control – Manually adjustable settings for aircraft-specific requirements.
• Field-Deployable & Mobile – Easily towed and maneuvered in various terrains.

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