Škoda 9Tr: the legendary trolleybus that changed urban transport

Trolleybus Škoda 9Tr is not just a vehicle, but a real legend of Soviet and post-Soviet urban transport. Since the first production in 1961 at the plant Škoda Ostrov nad Ohří (Czechoslovakia) this model has become a symbol of reliability and durability. In the USSR and Eastern European countries 9Tr has been in use for decades, and some examples are still in service today - despite the fact that production officially ended in 1982.

What does Škoda 9Tr so special? Firstly, this is the first trolleybus model with monocoque body, which significantly increased its strength and reduced weight. Secondly, thanks to the modular design and ease of repair, the trolleybus was adapted to a variety of conditions - from the frost of Siberia to the heat of Central Asia. Today 9Tr It is interesting not only as a retro transport, but also as an object for restoration, modernization and even conversion into electric buses.

In this article we will look at technical specifications, operating features, typical malfunctions and methods for eliminating them, and we will also tell you where can be seen today Škoda 9Tr in working order. If you are a driver, a mechanic, or just a lover of retro technology, you will find useful information here.

History of creation and evolution of the Škoda 9Tr model

Trolleybus development Škoda 9Tr began in the late 1950s as a response to the growing needs of cities for reliable and spacious transport. Czech engineers have set themselves an ambitious task: to create a trolleybus that would be superior to Soviet models MTB-82 and ZiU-5 in terms of comfort, speed and maintainability. The first prototypes appeared in 1958, and mass production started in 1961.

For 21 years of production (1961–1982) it was produced more than 11,000 copies, of which about 70% were supplied to the USSR. I wonder what 9Tr became the first trolleybus in the world with automatic traction motor control system (based on a thyristor-pulse regulator), which greatly simplified the work of drivers. In the 1970s, the model was modernized: options with an extended body appeared (Škoda 9TrHT for Budapest) and articulated versions (Škoda 10Tr).

In the USSR, the trolleybus received the designation Škoda 9Tr (sometimes - Skoda 9Tr with Russian transliteration) and was operated in more than 50 cities - from Kaliningrad to Vladivostok. After the collapse of the USSR, many copies were written off, but some continue to work in small cities of Ukraine, Moldova and Russia, as well as in museums and retro parks.

• 📅 1958–1961 — development and testing of prototypes.
• 🚏 1961 - start of mass production.
• 🔧 1970s — modernization with the introduction of thyristor control.
• 🌍 1982 - completion of production, but operation continues to this day.

Technical specifications of the Škoda 9Tr: what's under the hood?

Construction Škoda 9Tr It is distinguished by its simplicity and reliability, which ensured its long life. The trolleybus body is made of steel profiles with aluminum sheathing, which reduces the weight to 10.3 tons (for comparison: Soviet ZiU-9 weighed a ton more). Engine - DC traction motor TE 022 with a power of 86 kW (117 hp), which accelerated the trolleybus to 65 km/h.

One of the key innovations was electrical control system with rheostat and thyristor-pulse regulation. This made it possible to move away smoothly and save energy. The brake system is combined: electrodynamic (regenerative braking) and pneumatic (pads for all wheels). The suspension was dependent, on semi-elliptical springs, which ensured a good smooth ride even on rough roads.

Parameter	Meaning
Length × Width × Height	11,400 × 2,500 × 3,080 mm
Weight (empty)	10,300 kg
Engine power	86 kW (117 hp)
Maximum speed	65 km/h
Passenger capacity	up to 110 people (25 seats)

Deserves special attention electrical equipment: the trolleybus is equipped with a system Škoda AMU (Automatic Motor Control), which allowed the driver to choose between manual and automatic control modes. This was a revolutionary decision for that time! Also in 9Tr were used lead acid batteries with a capacity of 120 Ah for autonomous operation over short distances (up to 500 meters).

⚠️ Attention: When working with high voltage equipment Škoda 9Tr (voltage in the contact network - 600 V) be sure to use dielectric gloves and insulated tools. Even after the power is turned off, capacitors can retain a dangerous charge!

Advantages and disadvantages of the Škoda 9Tr: why is it still on the road?

Main advantage Škoda 9Tr — indestructible design. The body made of steel profiles can withstand decades of use, and the simple electrical circuit allows the trolleybus to be repaired even in the field. Here are the main advantages of the model:

• 🔧 Maintainability: spare parts are interchangeable, many components are unified with other Czech trolleybuses (Škoda 10Tr, 14Tr).
• ⚡ Energy efficiency: A thyristor control system reduces power consumption by 15–20% compared to a rheostatic control system.
• 🚌 Capacity: up to 110 passengers - a record for trolleybuses of that time.
• 🌡️ Climate adaptability: successfully operated at temperatures from -40°C up to +40°C.

However, there are also disadvantages that have become obvious over time:

• 🚫 Outdated ergonomics: cramped driver's cabin, uncomfortable seats for passengers.
• 🔋 Weak batteries: Lead-acid batteries require frequent maintenance and replacement.
• 🛑 Low top speed: 65 km/h - not enough for modern highways.
• 🚨 Brake problems: The pneumatic system is sensitive to moisture and requires regular bleeding.

Unique fact: some examples of the Škoda 9Tr were converted into autonomous electric buses by installing lithium-ion batteries instead of lead batteries. For example, in Kyiv and Minsk such modernized trolleybuses run along historical routes.

Typical faults and solutions

Despite the reliability Škoda 9Tr has a number of “diseases” associated with age and wear. Here are the most common problems and ways to solve them:

1. Traction motor problems (TE 022):

   Symptoms: the engine does not develop full power, overheats, and makes strange noises.

   Causes: wear of brushes, bearings or windings.

   Solution: replace the brushes (part number Škoda 8J 350 021), check the condition of the collector. If the windings are heavily worn, rewinding is required.

2. Malfunctions of the thyristor unit:

   Symptoms: jerking when moving, spontaneous shutdown of traction.

   Reasons: breakdown of thyristors, oxidation of contacts, failure of the cooling system.

   Solution: clean the contacts, replace faulty thyristors (for example, T150-10), check the cooling fans.

3. Leaks in the pneumatic system:

   Symptoms: slow braking, pressure drop in receivers.

   Reasons: cracks in hoses, wear of cuffs in brake cylinders.

   Solution: replace the hoses (it is recommended to use reinforced ones), repair the cylinders and replace the seals.

Check the pressure level in the pneumatic system (normal: 6–8 bar)

Inspect contact shoes for wear

Test the operation of the thyristor unit in manual mode

Check the battery charge (voltage is not lower than 11.5 V per cell) -->

Particular attention should be paid contact network. Due to wear on the shoes (current collectors) sparking and contact breaks are possible. The solution is to regularly replace graphite inserts (article no. Škoda 8J 370 001) and checking the cable tension.

⚠️ Attention: When replacing thyristors in the control unit Škoda AMU Be sure to use thermal paste to dissipate heat. Overheating of thyristors leads to their breakdown and can cause a fire in the electrical compartment!

Modernization of the Škoda 9Tr: how to extend the life of the legend?

Many owners and enthusiasts do not limit themselves to maintaining Škoda 9Tr in working order, but undergoing deep modernization. Here are the most popular upgrade directions:

• 🔋 Replacing batteries: Instead of lead-acid batteries, lithium-ion batteries are installed (for example, LiFePO4), which increases the autonomous travel to 20–30 km.
• 🖥️ Electronics update: replacing relay logic with microprocessor controllers (for example, SEVCON or Curtis).
• 🪑 Salon: installation of new seats, LED lighting, USB ports for charging gadgets.
• 🚗 Body: anti-corrosion treatment, replacement of rusty panels with new ones (in some cases, complete re-riveting of the body).

One of the most ambitious projects is the refurbishment Škoda 9Tr in fully autonomous electric bus. To do this, the current collectors are dismantled, powerful batteries are installed (for example, from Tesla or BYD) and a modern inverter. This upgrade costs 1.5–2 million rubles, but allows you to operate a trolleybus without a contact network.

An example of successful modernization

In 2020, the Škoda 9Tr Electric project was presented in Minsk, where the original trolleybus was equipped with lithium-ion batteries with a capacity of 120 kWh and an asynchronous motor with a capacity of 120 kW. The power reserve was 150 km, and the maximum speed increased to 75 km/h. The cost of the project is about 3 million rubles, but it proved that even a 60-year-old trolleybus can become a modern electric bus.

For those who want to maintain authenticity, but improve reliability, it is suitable partial modernization:

• Replacing the original engine TE 022 to more powerful TE 023 (100 kW).
• Installation of a modern battery charger.
• Installation of GPS monitoring system and video recorders.

Where can you see the Škoda 9Tr today?

Despite the fact that the majority Škoda 9Tr written off, some copies continue to work or are stored as museum exhibits. Here's where you can find them:

• 🇷🇺 Russia:
  • St. Petersburg - Museum of Electric Transport (a copy of 1965).
  • Nizhny Novgorod - a retro trolleybus on route No. 10 on city holidays.
  • Kemerovo is the only operating 9Tr in Siberia (route 5).
• 🇺🇦 Ukraine:
  • Kyiv – Museum of Urban Transport (3 copies, including articulated articulated articulated articulated articulations) Škoda 9TrHT).
  • Lviv is a retro trolleybus on the tourist route "Lviv tram".
• 🇨🇿 Czech Republic:
  • Pilsen - museum Škoda (The first prototype was made in 1958).
  • Island nad Ogří - factory museum where they were collected 9Tr.

Several trolleybuses have also been preserved in Transnistria (Tiraspol) Moldova (Chisinau) and Belarus (Minsk). In some cities, enthusiasts are organized retroflight on historical routes - for example, in Moscow on the route "B" sometimes comes out restored Škoda 9Tr 1970 release.

Operating the Škoda 9Tr today: tips for drivers and mechanics

If you have managed or maintained Škoda 9TrHere are some practical tips:

1. Before leaving:

   Check the pressure in the pneumosystem (normal - 6–8 bar). If the pressure drops faster than 30 minutes, look for a leak in hoses or receivers.

2. On the move:

   Avoid sharp starts - this increases the wear of the engine brushes. Optimal mode: smooth pedal pressing with the transition to automatic control after 15 km/h.

3. Winter operation:

   Before frosts, drain condensate from the pneumatic system through the cranes at the lower points of the receivers. Use winter diesel fuel for the cabin heater.

4. Battery maintenance:

   Check electrolyte levels and density every 3 months (normal) 1.27–1.29 g/cm3). Charge the batteries at least 1 time per week, even if the trolleybus is not in operation.

Pay special attention cock-lifter. If graphite inserts wear more than 50%, they must be replaced. Also keep an eye on the condition. contact-line Their breakup can lead to an emergency stop.

⚠️ Attention: When working with high-voltage equipment Škoda 9Tr Never touch the body and current parts at the same time - even with power off, the capacitors may remain charged up to 300 V!

FAQ: answers to frequently asked questions about the Škoda 9Tr

🔹 How much does the renovated ŠKODA 9Tr cost?

The price depends on the state and level of modernization:

• "Donor" (parts): 150,000-300,000 rubles.
• Working copy (without restoration): 500,000-800,000 rubles.
• Completely renovated (with modernization): 1.5-3 million rubles.
• Museum exhibit (with historical value): up to 5 million rubles.

The cost of the restoration from scratch is 1–1.5 million rubles (including replacement of body panels, engine and electronics)

🔹 Is it possible to convert the Škoda 9Tr into an autonomous electric bus?

Yes, it is real, but it will require a serious investment. Main stages:

1. Dismantling of current collectors and high-voltage equipment.
2. Installation of lithium-ion batteries (e.g. LiFePO4 capacity of 100-150 kWh).
3. Replacement of the traction engine with an asynchronous one (power 100-120 kW).
4. Installation of the regenerative braking system.

Approximate cost: 1.5–2.5 million rubles. Ready-made solutions are offered by companies from the Czech Republic and Belarus.

🔹 What kind of oil should I put in the Škoda 9Tr gearbox?

For rear axle gearbox Škoda 9Tr It is recommended to use transmission oil class GL-5 with viscosity:

• SAE 80W-90 - for temperate climates.
• SAE 75W-90 - for cold regions (below) -20°C).

Refill volume: 12 liters. Oil replacement is done every time. 50,000 km or once every 2 years.

🔹 Where can I buy spare parts for the Škoda 9Tr?

Main sources:

• Czech Republic: factory Škoda Electric (island nad Ogří) still produces some parts (for example, brushes, thyristors).
• Russia/Ukraine: spare parts markets in Moscow, Kiev, Minsk (specialized companies such as "RetroTrans").
• Internet: auctions eBay, Avitosocial media groups (e.g., "Skoda 9Tr - Amateur Club").
• Self-production: Many parts (such as body panels) can be restored or custom made.

The cost of spare parts varies: for example, a new thyristor unit will cost in the future. 80,000–120,000 rublesand the graphite inserts for the current collectors in 5,000–10,000 rubles per set.

🔹 Can you drive the ŠKODA 9Tr without a T-category license?

Nope. In Russia and most CIS countries, trolleybus control (including retro models) is required. category “T” law (trolleybus) To obtain it, it is necessary:

1. To undergo training in a specialized training center (for example, at a depot).
2. Pass a theoretical exam (SDA + trolleybus device).
3. Pass the practice at the training ground and in the city.

Exception - if the trolleybus is converted to self-driving and does not use a contact network, categories may be sufficient "D" (for buses).