Introducción
Use this guide to service the Makita Jack Hammer HM1203C 2010. This includes replacing seals, grease, and motor brushes.
Wherever there’s grease, make sure to clean it off and replace it with new grease. The recommended grease is Makita 181490-7.
Throughout this guide, the service kit parts will be referred to by their part description in the service kit, i.e. “O-ring 23”.
Qué necesitas
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Use a Phillips #2 screwdriver to remove the three screws securing the motor cover.
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Pull the brush connector straight off of its spade to disconnect the brush.
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Use a Phillips #2 screwdriver to remove the six screws securing the handle assembly.
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Use a small pry bar or flathead screwdriver to pry the rubber front cap off of the hammer.
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Use an angled pick to pull the washer and rubber ring 39 out of the barrel.
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Lift the upper-most rubber ring straight up and remove it from the bolt holder.
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Separate the rubber ring 24 and the two metal sleeves from the bolt holder.
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Use an angled pick to lift the O-ring 35.5 out of its groove on the bolt holder.
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Remove the O-ring 35.5.
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Use a long punch, long flathead screwdriver, or a thin, long bar to push the bolt out of the bolt holder.
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Remove the bolt.
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Use an angled pick to pry the X-ring 21 out of its groove in the bolt.
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Remove the X-ring 21.
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Use an angled pick to pry the fluoride ring 28 out of its groove in the bolt.
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Remove the fluoride ring 28.
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Use an angled pick to pry the O-ring 23 out of its groove in the bolt.
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Remove the O-ring 23.
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Use a pick to pry the striker O-ring 31.5 out of its groove on the striker.
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Remove the striker O-ring 31.5.
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Use a 5 mm hex key to remove the six screws securing the aluminum housing.
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Use a Phillips #2 screwdriver to remove the four screws securing the piston cover.
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Use an arbor press and a custom punch to carefully press the crank shaft, bearing, and gear assembly out of the housing.
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If you don't have access to a press or custom tool, use a punch and a hammer to tap the crank shaft until the whole crank shaft, bearing, and gear assembly starts to slide out.
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Use a pick to pry the piston O-ring 31.5 out of its groove in the piston.
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Remove the piston O-ring 31.5.
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Use a pick to pry the O-ring 35 out of its groove in the piston.
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Remove the O-ring 35.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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