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About Jacks

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The Locomotive Engineering Workshop at Jamalpur (as it was originally known) was established on the 8th of February, 1862. Jamalpur Jacks, manufactured at the Jamalpur Locomotive Workshop, are specialized hydraulic jacks used in Indian Railways for lifting locomotives and rolling stock during maintenance and repair. They are designed for various tasks, including lifting locomotives for inspection and maintenance, wheeling and de-wheeling operations in workshops, and other lifting purposes with appropriate adaptors.  There are mainly two types of Jamalpur Jack – 25 Ton JMP Jack (Ty-U Modified)
35 Ton JMP Jack (Ty-H Modified)

Technical Highlights

25 Ton JMP Jack (Ty-U Modified)

  1. 1. Application: Suitable for ICF, LHB & EMU Coaches, Wagons, ALCO Diesel Locos, DEMU/DPC
  2. 2. Claw Lift Range: 700 mm (min) to 2310 mm (max); 1610 mm total lift
  3. 3. Claw Size & Projection: 300×257 mm; 870 mm from beam center, 647 mm from screw spindle
  4. 4. Ground Clearance: 20 mm when resting on wheels
  5. 5. Hoisting Speed: ~200 mm/min
  6. 6. Weight & Dimensions: Approx. 2.0 Tonnes; 2800×1550×950 mm
  7. 7. Screw Spindle Specs: 100 mm dia, 2730 mm length, 1926 mm threaded, 25 mm pitch
  8. 8. Load Nut Height: 203 mm

25 Ton JMP Jack (Ty-U Modified)

  1. 9. Motor Power: 7.5 HP with 25 Amp DOL Starter
  2. 10. Bearings: SKF 53416 U (Thrust), SKF 2310 (Self-aligned), SKF 6215 (Deep Groove)
  3. 11. Drive & Chain Mechanism: Duplex sprockets and chain
  4. 12. Beam Type & Wheels: Double ‘U’ beam with spring-loaded wheels
  5. 13. Safety & Interlocking: Integrated interlocking mechanism
  6. 14. Load Surface Area: 800×1160 mm
  7. 15. Estimated Unit Cost: ₹29,94,875 (with transportation)
  8. 16. Estimated Cost for 5 Jacks: ₹2,49,74,375 (with transportation)


35 Ton JMP Jack (Ty-H Modified)

  1. 1. Application: Designed for HHP Locos, Electric Locos, ALCO Locos, LHB Coaches & Wagons
  2. 2. Claw Lift Range: 895 mm (min) to 2655 mm (max); 1760 mm total lift
  3. 3. Claw Size & Projection: 135×267 mm; 810 mm from beam center, 587 mm from screw spindle
  4. 4. Ground Clearance: 20 mm when resting on wheels
  5. 5. Hoisting Speed: ~220 mm/min
  6. 6. Weight & Dimensions: Approx. 2.0 Tonnes; 3273×1550×950 mm
  7. 7. Screw Spindle Specs: 110 mm dia, 3128 mm length, 2236 mm threaded, 25 mm pitch
  8. 8. Load Nut Height: 305 mm

35 Ton JMP Jack (Ty-H Modified)

  1. 9. Motor Power: 10 HP with 40 Amp DOL Starter
  2. 10. Bearings: SKF 53420 U (Thrust), SKF 2312 (Self-aligned), SKF 6217 (Deep Groove)
  3. 11. Drive & Chain Mechanism: Triplex sprockets and chain
  4. 12. Beam Type & Wheels: Double ‘U’ beam with spring-loaded wheels
  5. 13. Safety & Interlocking: Integrated interlocking mechanism
  6. 14. Load Surface Area: 800×1160 mm
  7. 15. Estimated Unit Cost: ₹13,53,739 (with transportation)
  8. 16. Estimated Cost for 5 Jacks: ₹67,68,695 (with transportation)

Jacks Faq's


How do I synchronize all four jacks during lifting?

  • Connect all jacks using the designated power/control cables.
  • Use the “UP” button on the master control panel of Jack No. 1.
  • Ensure claws of all jacks touch the lifting pads before lifting together.
  • Visually supervise for any height differences and correct individually if needed.

Note:-Download User Manual For More Detail .

How should I test the jacks before operation?

  • Conduct a no-load test after verifying electrical connections and gear oil levels.
  • Ensure correct alignment, check direction of motor rotation, and test limit switches.


Note:-Download User Manual For More Detail .

What should be done before commissioning a new jack set?

  • Clean components using kerosene.
  • Fill 15L of gear oil (e.g., RR-606MG or Servo Mesh SP 257).
  • Tighten bolts, clean electrical components, check gear oil levels, and perform a no-load test.


Note:-Download User Manual For More Detail .

What is the recommended lubrication schedule?

  • Weekly to monthly lubrication depending on the part (refer to lubrication diagram on Pg. 36).

  • Use Servo Mesh SP 257 for gearboxes, Servo Way 68 for screws/wheels, and Servo Gem 2 for bearings


Note:-Download User Manual For More Detail .

The jack's lifting movement is jerky. What could be wrong?

Potential issues include:

  • Lack of lubrication 
  • Rollers too tight
  • Broken roller pins  

Solution: Lubricate properly, check roller alignment, and replace damaged pins.

Download User Manual

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