On Job (OJT) Training for overhaul personnel



The following personnel are required to undertake D 30 howitzer overhaul to the required level:

  • Welder
  • Lathe operator
  • Hydraulics technician for counter-recoil mechanism and recoil brake
  • Specialist in overhaul of breechblock and semi-automatic loader
  • Specialist in overhaul of cheeks and upper/lower carriage
  • Specialist in overhaul of chassis and braking system
  • Specialist in overhaul of barrel, breech and cradle assembly.
  • Electrical equipment technician
  • Gun sight specialist
  • Quality controller
  • Assembly and disassembly specialist

Expertise levels

  • Each individual should be familiar with both the theory and practice of the following:
  • Structure and technical characteristics of the D30
  • Operating principle and structure of their specific components
  • List of equipment and tools
  • Sequence of disassembly and assembly of components
  • Troubleshooting and fault detection
  • Safety measures to be observed during overhaul


In order to achieve this trainees will require the following basic skill sets:

  • To be able to read technical procedure manual and apply the procedure as stated.
  • Be familiar with the instruments and tools used for repair/overhaul.
  • Be able to prepare/ update service record for the gun or component concerned.
  • Be familiar with the correct use of general-purpose equipment – lifting and handling gear, cleaning equipment etc used in the overhaul process.

Organization of Training

Whilst it is appreciated that the aim is to carry out as much training as possible on an OTJ basis considerations of practicability and safety dictate that some degree of theoretical instruction will be required to bring trainees to the level of competence necessary for them to function effectively on the overhaul line.

In terms of basic qualifications the major requirements for trainees are as follows

  • technical secondary education;
  • not less than 2 years prior experience working with technical equipment.


For those in this category it is proposed to organize trainees into two groups of 12 individuals and each group will undertake a maximum of four hours of theoretical training or six hours of practical training on any one day. Practical training will commence after trainees have demonstrated an understanding of the theoretical elements.


Theory Training


This will take place in a classroom environment equipped with tables, seating, white-board, and overhead projector.

Documentation will be provided on overhaul and operation of D30 supplemented by illustrative wall posters.


Training will be provided by a combination of short lectures and classroom discussion. Tests on theoretical knowledge will be made on a regular basis to determine candidate’s suitability to proceed to the practical stage.


Practical Training


Practical training will take place on the established overhaul line, the content and structure of which is dealt with in the main proposal.


After completion of the initial five howitzers under close supervision, each group of trainees will undergo practical examination carrying out an independent overhaul of a further three howitzers.

For this purpose an examining committee will be formed, which in addition to the instructor for each discipline will also include customer representatives.

Technicians who successfully pass this practical examination will be nominated as artillery mechanical engineer level 3.

With further on the job training it is anticipated that able individuals will progress to level 6.

Trainees will also take part in post overhaul testing of the howitzer at the nominated firing range in the presence of customer representatives/mentors.

Lathe operators and welders will require additional practical training, which can be provided during the overhaul process. (OTJ)


Training Session Content


Each training session lasts 50 minutes, and the total comprises 292 hours, split between process practical training 212 hours and theoretical 80 hours.


Module 1 – 12 hours

  • General information on physical structure, tactical deployment and operational use of D-30 howitzer.
  • Gun crew tasks, and component composition of howitzer.
  • Marking and numbering of parts
  • Type, frequency, and content of maintenance and repair program
  • Preparation of howitzers for storage
  • Conservation and de-preservation
  • Running repairs and materials


Module 2- Overhaul Fundamentals – 48 hours

  • Overhaul specifications
  • Technology for disassembly/ reassembly
  • Technical assessment of defects
  • Technical charts
  • List of parts for mandatory replacement
  • Purpose structure and operating principles of tooling and equipment used in overhaul
  • Workshop premises and overview and operating requirements
  • Preparation of workstations.
  • List of mandatory checks for defective parts and components
  • Safety considerations
  • Use of special equipment for: cleaning, washing, diagnostics, disassembly/assembly, cutting, hydraulic fluid replacement, lubrication, lifting, material handing, installation and adjustment.
  • Testing stand construction
  • Post overhaul howitzer test firing
  • Theoretical Exam


Module 3- Process Practical Training – 212 hours

  • Documentation overview
  • Practical performance of overhaul tasks including:
    pre-overhaul cleaning, diagnostic tests, disassembly/assembly, cutting, hydraulic fluid replacement, lubrication, adjustment, and painting.
  • Stand testing for counter-recoil and recoil brake mechanisms
  • Overhaul record completion
  • Testing procedures for individual components


Module 4 – Quality Enhancement and Training of Trainers – 20 hours

  • Innovation and information exchange
  • Organization of training courses and qualifications
  • New technology and methodology
  • Final exam

Supporting Materials

  • Training literature on composition and assembly of D30
  • Technical documentation D30 howitzer
  • Training display posters
  • Equipment and tools.



Tonnes of iron
Shot at Siege of Sebastopol during Crimean War


Revolutions per minute
Does a bullet fired from Lee Enfield rifle, as used in both world wars


The Nizam of Hyderabad raised in 1975 for his war against the Marathas


Is an effective range of Big Bertha, the World War I howitzer

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Contact Information


State Foreign Trade Enterprise “SpetsTechnoExport” is a fully state-run entity incorporated by the Government of Ukraine in 1998 for export-import activities at foreign armaments markets.


7, Stepana Bandery Avenue
Kyiv, 04073, Ukraine
tel: +380 44 5685070
fax: +380 44 5685068


B-5/147 Safdarjung
110057, New Delhi
tel: +91 11 26153792
fax: +91 11 26153830


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