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Makita Jack Hammer HM1203C 2010 Striker Service

Prerequisite Only
This guide is only intended to be used as a prerequisite for other guides. It's incomplete by itself.

Introduction

Service the striker in a Makita Jack Hammer HM1203C 2010.

Wherever there’s grease, make sure to clean it off and replace it with new grease. The recommended grease is Makita 181490-7.

What you need

  1. Makita Jack Hammer HM1203C 2010 Striker Service, Remove the side handle: step 1, image 1 of 1

    • Unscrew the knob securing the side handle.

    Edit

  2. Makita Jack Hammer HM1203C 2010 Striker Service: step 2, image 1 of 2 Makita Jack Hammer HM1203C 2010 Striker Service: step 2, image 2 of 2

    • Remove the bolt securing the side handle.

    • Remove the side handle.

    Edit

  3. Makita Jack Hammer HM1203C 2010 Striker Service, Disassemble the front end: step 3, image 1 of 3 Makita Jack Hammer HM1203C 2010 Striker Service, Disassemble the front end: step 3, image 2 of 3 Makita Jack Hammer HM1203C 2010 Striker Service, Disassemble the front end: step 3, image 3 of 3

    • Use a small pry bar or flathead screwdriver to pry the rubber front cap off of the hammer.

    • This can be replaced as part of a service kit.

    Edit

  4. Makita Jack Hammer HM1203C 2010 Striker Service: step 4, image 1 of 2 Makita Jack Hammer HM1203C 2010 Striker Service: step 4, image 2 of 2

    • Use a pair of snap ring pliers to expand the snap ring on the front of the hammer.

    • Remove the snap ring.

    Edit

  5. Makita Jack Hammer HM1203C 2010 Striker Service: step 5, image 1 of 1

    • Remove the washer on the front of the hammer.

    Edit

  6. Makita Jack Hammer HM1203C 2010 Striker Service: step 6, image 1 of 1

    • Lift the front cover off of the front of the hammer.

    Edit

  7. Makita Jack Hammer HM1203C 2010 Striker Service: step 7, image 1 of 1

    • Lift the rubber ring off of the front of the hammer.

    Edit

  8. Makita Jack Hammer HM1203C 2010 Striker Service: step 8, image 1 of 1

    • Remove the inner front cover.

    Edit

  9. Makita Jack Hammer HM1203C 2010 Striker Service: step 9, image 1 of 3 Makita Jack Hammer HM1203C 2010 Striker Service: step 9, image 2 of 3 Makita Jack Hammer HM1203C 2010 Striker Service: step 9, image 3 of 3

    • Compress the spring and hold it down while you pull the two retainers out of their slots and remove them.

    Edit

  10. Makita Jack Hammer HM1203C 2010 Striker Service: step 10, image 1 of 2 Makita Jack Hammer HM1203C 2010 Striker Service: step 10, image 2 of 2

    • Remove the spring guide.

    • Remove the spring.

    Edit

  12. Makita Jack Hammer HM1203C 2010 Striker Service, Remove the barrel: step 11, image 1 of 2 Makita Jack Hammer HM1203C 2010 Striker Service, Remove the barrel: step 11, image 2 of 2

    • Remove the front barrel cover.

    Edit

  13. Makita Jack Hammer HM1203C 2010 Striker Service: step 12, image 1 of 1

    • Remove the 4 mm hex bolt securing the barrel cover.

    Edit

  14. Makita Jack Hammer HM1203C 2010 Striker Service: step 13, image 1 of 2 Makita Jack Hammer HM1203C 2010 Striker Service: step 13, image 2 of 2

    • Lift the barrel cover straight up and remove it.

    Edit

  15. Makita Jack Hammer HM1203C 2010 Striker Service: step 14, image 1 of 2 Makita Jack Hammer HM1203C 2010 Striker Service: step 14, image 2 of 2

    • Use a pair of snap ring pliers to expand the snap ring securing the bolt holder.

    • Remove the snap ring.

    Edit

  16. Makita Jack Hammer HM1203C 2010 Striker Service: step 15, image 1 of 2 Makita Jack Hammer HM1203C 2010 Striker Service: step 15, image 2 of 2

    • Lift the washer off of the bolt holder and remove it.

    Edit

  17. Makita Jack Hammer HM1203C 2010 Striker Service: step 16, image 1 of 1

    • Remove four 6 mm hex bolts securing the barrel.

    Edit

  18. Makita Jack Hammer HM1203C 2010 Striker Service: step 17, image 1 of 2 Makita Jack Hammer HM1203C 2010 Striker Service: step 17, image 2 of 2

    • Lift the barrel straight up and remove it.

    Edit

  19. Makita Jack Hammer HM1203C 2010 Striker Service, Remove the rubber ring 39: step 18, image 1 of 3 Makita Jack Hammer HM1203C 2010 Striker Service, Remove the rubber ring 39: step 18, image 2 of 3 Makita Jack Hammer HM1203C 2010 Striker Service, Remove the rubber ring 39: step 18, image 3 of 3

    • Use an angled pick to pull the washer and rubber ring 39 out of the barrel.

    Edit

  20. Makita Jack Hammer HM1203C 2010 Striker Service: step 19, image 1 of 1

    • Remove the rubber ring 39.

    • This can be replaced as part of a service kit.

    Edit

  21. Makita Jack Hammer HM1203C 2010 Striker Service, Remove the bolt holder: step 20, image 1 of 1

    • Lift the upper-most rubber ring straight up and remove it from the bolt holder.

    Edit

  22. Makita Jack Hammer HM1203C 2010 Striker Service: step 21, image 1 of 1

    • Lift the upper-most washer straight up and off of the bolt holder.

    Edit

  23. Makita Jack Hammer HM1203C 2010 Striker Service: step 22, image 1 of 2 Makita Jack Hammer HM1203C 2010 Striker Service: step 22, image 2 of 2

    • Grasp the bolt holder, rubber ring 24, and the two metal sleeves below it, and lift it off of the cylinder.

    Edit

  24. Makita Jack Hammer HM1203C 2010 Striker Service, Remove rubber ring 24: step 23, image 1 of 2 Makita Jack Hammer HM1203C 2010 Striker Service, Remove rubber ring 24: step 23, image 2 of 2

    • Separate the rubber ring 24 and the two metal sleeves from the bolt holder.

    Edit

  25. Makita Jack Hammer HM1203C 2010 Striker Service: step 24, image 1 of 2 Makita Jack Hammer HM1203C 2010 Striker Service: step 24, image 2 of 2

    • Separate the rubber ring 24 from the two metal sleeves.

    • Remove the rubber ring 24.

    • This can be replaced as part of a service kit.

    Edit

  26. Makita Jack Hammer HM1203C 2010 Striker Service, Remove the O-ring 35.5: step 25, image 1 of 2 Makita Jack Hammer HM1203C 2010 Striker Service, Remove the O-ring 35.5: step 25, image 2 of 2

    • Use an angled pick to lift the O-ring 35.5 out of its groove on the bolt holder.

    • Remove the O-ring 35.5.

    • This can be replaced as part of a service kit.

    Edit

  27. Makita Jack Hammer HM1203C 2010 Striker Service, Remove the bolt: step 26, image 1 of 2 Makita Jack Hammer HM1203C 2010 Striker Service, Remove the bolt: step 26, image 2 of 2

    • Use a long punch, long flathead screwdriver, or a thin, long bar to push the bolt out of the bolt holder.

    • Remove the bolt.

    • During reassembly, make sure all the seals on the bolt stay seated properly while you slide the bolt back into the holder.

    Edit

  28. Makita Jack Hammer HM1203C 2010 Striker Service, Remove the cylinder: step 27, image 1 of 2 Makita Jack Hammer HM1203C 2010 Striker Service, Remove the cylinder: step 27, image 2 of 2

    • Lift the cylinder straight out of the aluminum housing.

    • During reassembly, the cylinder will have to slide over the piston, which is sitting in the bottom of the aluminum housing. Make sure the piston is centered and pointing straight up so that it slides all the way into the cylinder.

    Edit

  29. Makita Jack Hammer HM1203C 2010 Striker Service, Remove the striker: step 28, image 1 of 2 Makita Jack Hammer HM1203C 2010 Striker Service, Remove the striker: step 28, image 2 of 2

    • Pull the striker out of the cylinder.

    • You may need to shake the cylinder until the striker slides out of the bottom of the cylinder.

    • During reassembly, install the cylinder first, then push the striker in through the top, as seen in the second photo. Make sure the cylinder is seated all the way down into the housing before inserting the striker.

    Edit

  30. Makita Jack Hammer HM1203C 2010 Striker Service, Remove the striker O-ring 31.5: step 29, image 1 of 2 Makita Jack Hammer HM1203C 2010 Striker Service, Remove the striker O-ring 31.5: step 29, image 2 of 2

    • Use a pick to pry the striker O-ring 31.5 out of its groove on the striker.

    • Remove the striker O-ring 31.5.

    • This can be replaced as part of a service kit.

    Edit
Conclusion

To reassemble your device, follow these instructions in reverse order.

Author

Adam O'Camb

Member since: 04/11/15

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