KSM in military artillery: appointment, arrangement and repair of the box of speeds and mechanisms

The Speed and Mechanism Box (SFM) is one of the key components in military artillery, providing precision guidance, fire control and synchronization of all mechanisms of the combat vehicle. Without a serviceable CSM, even the most modern self-propelled artillery (Sau) or towed gun turns into a useless piece of metal. In this article, we will explain what is KSM in artilleryHow it is designed, what functions it performs and how to maintain it in working condition in the field.

The peculiarity of military equipment is that its mechanisms are operated in extreme conditions: from Arctic frosts to desert heat, with constant vibrations, shocks and dust. The CSM must withstand all this while maintaining accuracy and reliability. However, even the most durable nodes require regular maintenance, and in combat – quick repairs. We will tell you how to diagnose faults, conduct maintenance (TO) and what tools you will need for this.

The article will be useful not only for military mechanics, but also for civilian specialists engaged in the restoration or museumification of artillery systems, as well as enthusiasts of military equipment. You'll find it here. practical recommendations, diagrams, compatibility tables and answers to frequent questions about KSM in artillery.

What is a KSM in artillery and why it is needed

abbreviation SCS decipher gearbox. It is a complex mechanical (or hydromechanical) unit that performs several critical functions in artillery systems.

• 🔄 Transfer of torque from the engine (or manual drive) to the guidance mechanisms of the gun - vertical and horizontal.
• ⚙️ Change in speed guidance, which allows you to quickly switch between rough and accurate tipping.
• 🎯 Synchronization of work Fire control drives (fire control systems), including stabilization and automatic tracking of the target.
• 🛠️ Protection of mechanisms from overloads and blows when shooting.

In modern ACS (e.g., 2C19 "Msta-S" or 2C35 Coalition-SV) CFM is often integrated with hydraulic or electric drives, but in legacy systems (e.g. D-30 or 2A36 Hyacinth-B) it remains purely mechanical. The type of CFM depends on:

• 🔧 Complexity of service Hydraulic systems require monitoring of fluid levels and tightness.
• ⏱️ Targeting speed Mechanical CSMs are slower but more reliable in extreme conditions.
• 💰 Cost of repair Electronic components of modern CSM are more expensive to restore.

In combat conditions, the KSM is subjected to enormous loads. For example, when fired from a 152-mm howitzer 2A65 "Msta-B" yield up to 500 kNIt is the CSM that extinguishes some of these loads, preventing the system from unbalancing. Therefore, her condition directly affects precision and calculation-safety.

CSM device: the main components and their functions

The design of the KSM varies depending on the model of the gun, but it can be distinguished commonsIn almost all systems, there are:

1. Corps - cast or welded, of high-strength steel. It houses all the mechanisms and attaches the drives.
2. Drive shaft Connects to a manual flywheel or electric motor.
3. System gears Provides gear ratios for different guidance speeds.
4. Speed switching mechanism - allows the operator to choose the mode of operation (rough / accurate).
5. Brake devices - fix the position of the gun after guidance.
6. Lubrication system In modern CSM is often integrated with hydraulics.

In hydromechanical CSM (e.g. in the 2C1 Carnation) additionally present:

• 🛢️ Hydraulic pump - creates pressure in the system.
• 🔄 Hydromotors convert the pressure of the liquid into mechanical motion.
• 📉 Valves and distributors - control the flow of working fluid.

Special attention is paid to the CSM sealing. Dust, sand and moisture are the main enemies of the mechanisms. For example, in desert conditions sand with a particle size of less than 0.1 mm It can penetrate through microcracks and disable gears in a few days of intensive operation. Therefore, modern systems use:

• 🔒 Labyrinth seals - prevent dust from entering.
• 🛡️ Protective covers drive shafts.
• 🧴 Special lubricants with anti-corrosion additives (e.g., Litol-24M).

How is the KSM arranged in 2S1 "Carnation"

The 2C1 uses hydromechanical CSM with two guidance speeds: fast (up to 10°/s) for rough guidance and slow (up to 1°/s) for accurate guidance. The hydraulic part works on the oil AMG-10, and the mechanical includes a planetary gearbox for smooth switching of modes.

Signs of malfunctions of CSM and their diagnosis

The smears are different, but there are symptomatic, which should be alerted:

Sign of malfunction	Possible cause	Method of diagnosis
Screaming or knocking as the flywheel rotates	Wear of gears or bearings	Visual inspection after disassembly, check of backlashes
Jamming of the guidance mechanism	Infection of foreign objects or deformation of the shaft	Checking free passage manually, searching for mechanical obstacles
Oil leakage (in hydraulic CSMs)	Wear of seals or cracks in hydraulic highways	Inspection for oil stains, checking the pressure in the system
Smooth speed switching	Wear of synchronizers or unsettled drive	Test on all speed modes, traction adjustment
Increased heating of the CSM hull	Insufficient lubrication or overloading of mechanisms	Checking oil level, temperature measurement with infrared thermometer

For diagnosis in the field use:

• 🔧 Mechanical stethoscope - to listen to extraneous noises.
• 📏 Slice and clock type indicator - to measure the backlashes.
• 🔦 endoscope - to inspect hard-to-reach places without complete disassembly.

⚠️ Attention: If the gun is being used, the SCF metallicStop operating immediately! That could indicate gear-breakingThis will lead to complete jamming of the mechanism and the inability to fire.

In modern ACS (e.g., Coalition-SV) diagnostics are simplified by built-in self-monitoring, which display error codes on the operator's remote. However, in older systems (e.g., D-30) the experience of the mechanic and hand tools must be relied upon.

Typical breakdowns of CSM and ways to eliminate them

Let's see. most common breakdowns CSM and methods of repairing them. It is important to understand that in combat conditions, there is not always the possibility of a complete disassembly, so priority is given to the military. temporary measuresThis allows you to maintain combat readiness.

1. Wear of gears and bearings

This is the most common problem, especially in mechanical CSMs. Signs: rattle, flywheel, spot-pointing.

Repair:

• 🔧 Replacement of worn gears (in the field - installation of spares from the remplekt).
• 🛠️ Replacement or lifting of bearings (with critical wear - the planting of seats).
• 🧴 Washing the case and replacing the lubricant (use) Litol-24M or CIATEEM-201).

2. Leaks in the hydraulic system

Relevant for ACS with hydraulic CSMs (for example, 2C3 "Acacia"). Signs: oilspots under the car, pressure, slow-guided.

Repair:

• 🛢️ Replacement of sealing rings and cuffs (use remixes from the manufacturer).
• 🔧 The lift of threaded connections (without fanaticism - you can tear the thread!).
• 🚫 Temporary measure: winding of damaged hose fume-ribbon (Only for emergencies!)

3. Jamming of the guidance mechanism

Most often it happens because of lashing (sand, shards) or shaft-deformation after the impact.

Repair:

• 🔍 Complete disassembly and cleaning of the mechanism (in the field - purging with compressed air).
• 🔧 Correction or replacement of a bent shaft (requires turning works).
• ⚠️ If the jamming occurred during a fight, try it. flywheel back and forth Sometimes it helps to move the stuck mechanism.

⚠️ Attention: When replacing gears in the KSM 2A36 Hyacinth-B check in compatibility of teeth modules. Installation of the gear with the wrong module will lead to fast-wear the whole machine!

Maintenance of KSM: regulations and practical advice

Regular maintenance of the KSM is the guarantee of its long service. Military equipment is used rigidityIn reality, however, the operating conditions often dictate their own adjustments. Below is the following. minimumwhich must be carried out regardless of the situation:

The view TO	Frequency	List of works
Daily maintenance (ETS)	After each fight/march	Leak inspection, flywheel free-running, dust cleanup
Maintenance No. 1 (TO-1)	Every 500 km or 50 shots	Lubrication of rubbing parts, check of fasteners, adjustment of actuators
Maintenance No. 2 (TO-2)	Every 2,000 km or 200 shots	Replacement of oil in the hydraulic system, checking gears for wear, replacement of seals
Seasonal service	2 times a year (spring/autumn)	Washing of the system, replacing lubricant with seasonal, checking tightness

Pay special attention lubricant. The CSM uses:

• 🧴 Litol-24M - for mechanical units (operates at temperatures from -40 ° to +120 ° C).
• 🛢️ AMG-10 Hydraulic oil for hydraulic drive systems.
• 🥶 CIATEEM-201 - for work in Arctic conditions (up to -60 ° C).

When replacing oil in a hydraulic CSM, follow the algorithm:

1. Pour the old oil with working temperature (about +50°C) – so it is better removed with contaminants.
2. Clean the system. specialty (e.g., MC-8P).
3. Pour in the new oil, pump the system (Put the velocity on all speeds).
4. Check the oil level after 10-15 minutes of work - add if necessary.

⚠️ Attention: Never mix different types of oils in a hydraulic system. For example, AMG-10 and MGE-10A are incompatible This will lead to the formation of precipitation and jamming of the valves.

Tools for repair and maintenance of KSM

It will be necessary to work with the CSM specializedThis is not always the case with a standard mechanic. Here. minimumWhich should be in the repair shop:

• 🔧 Dynamometer keys - for precise tightening of threaded joints (for example, the moment of tightening of bearings in the KSM) D-30 - 120-150 Nm.
• 🔍 endoscope - to inspect the internal cavities without disassembly.
• 📏 Micrometer and nutrometer - to measure wear of gears and bearings.
• 🛠️ Filmmakers. - for the removal of bearings and gears.
• 🧴 Hydraulic washing kit - includes hoses, oil tanks and filters.
• 🔥 Gas burner - to heat parts when pressed (for example, bearings).

It'll be useful for field repairs. portable:

• 🔧 Divorce key And a set of heads.
• 🧰 A soft-boiled hammer (for working with aluminum enclosures).
• 🛢️ Lubricant syringe (e.g., oil-press).
• 🧲 Magnetic capture - to extract metal shavings.

When working with hydraulic systems, be sure to:

• 🛠️ Set of sealing rings (standard dimensions: 10×1.5, 15×2, 20×2.5 mm).
• 📉 Manometer To check the pressure in the system (normal for the 2C1 - 12-15 MPa.
• 🧴 Sealant anaerobic (e.g., Loctite 577) for sealing of threaded joints.

To diagnose electronic components (in modern ACS) will require:

• 💻 Laptop with software (e.g., "Kalina Diagnostics." for Russian equipment).
• 🔌 K-Line adapter - to connect to the onboard network.

How to make a bearing removable in the field

If there is no factory taker, use two M12 nut bolts and a metal plate. Fix the plate on the shaft, screw the bolts into the bearing holes and evenly tighten the nuts until the part comes down.

Modernization and tuning of the CSM: when it is justified

In some cases, CSM can be modernizeTo improve its characteristics. However, any changes should be made. justified and not to violate the combat qualities of the system. Let's see. most common modifications:

1. Replacement of mechanical CSM with hydraulic

Relevant to legacy systems (e.g., D-30). Pros:

• ⚡ More smooth guidance.
• ⏱️ Increased guidance speed 1.5 to 2 times.

Cons:

• 💰 High cost (The hydraulics kit for the D-30 costs ~500-700 thousand.) rub.
• 🛠️ Complexity of service in the field.

2. Installation of electronic feedback sensors

It allows you to integrate CSM with modern fire-control (CSW) For example, in 2C19 "Msta-S" After this, the accuracy of the shooting increases 15–20%.

3. Strengthening the corps of the CSM

It is relevant for machines operated in mountainous areas or under extreme loads. Methods:

• 🔧 Installation extra-ribbon.
• 🛡️ Replacement of the staff building by carbon-steel (e.g. stamp) 30xxx).

⚠️ Attention: Any upgrade of the CSF should be agreed with design documentation! For example, replacing gears with non-standard gears (with a different gear ratio) can lead to failures in the CAO and guarantee (If the equipment is on the balance sheet of the Ministry of Defense).

In the civilian segment (for example, when restoring museum exhibits) is often practiced. Replacement of worn parts with 3D printing. But for combat vehicles, it's unacceptable Only original parts or certified analogues.

FAQ: Frequent questions about KSM in artillery

🔧 How often should I change the oil in a hydraulic CSM?

In hydraulic systems (e.g., 2C3 "Acacia"oil ()AMG-10) it is recommended to change each 200-300 rounds. Or, once a year, whichever comes first. In extreme conditions (desert, highlands) the interval is reduced to 100 shots fired..

⚙️ Can I repair the CSF without a complete disassembly?

In the field, they are often limited. partial:

• Replacement of seals on drive shafts.
• Add or replace the oil.
• Adjustment of backlashes in manual drives.

But, in the meantime, seriousness (wear gears, cracks in the body) requires a complete disassembly.

💥 What if the KSM is stuck during the fight?

Algorithm of action:

1. Try it. flywheel back and forth Sometimes it helps to move the stuck mechanism.
2. If it didn't help, switch to backup manual drive (If it is designed according to the design).
3. In the extreme, Set the gun in its current position and fire with the deviations.

After the fight, you must follow. full-diagnostic!

🛠️ What parts for CSF can be made independently?

In the field, it is possible to manufacture:

• 🔧 Sealing gaskets - paronite or copper.
• 🛢️ High-pressure hose - using remixes for hydraulics.
• ⚙️ Splints and lock rings - with the wire.

However, gears, bearings and shafts It should only be manufactured in a factory!

📚 Where can I find technical documentation on the CSF?

Official sources:

• Operational manuals (Attached to each vehicle).
• Albums of drawings (available in repair parts).
• Electronic databases (e.g., Electronic Armament Directory for Russian equipment).

For civil professionals: some drawings can be found in open-source (e.g. forums) "Military Review" or Artillery Portal).