This is a genuine OEM approved replacement part designed for use with Hitachi nailers. The piston is a central component of an engine. It both provides compression within the engine, as well as transfers the energy from combustion to the crankshaft (which creates rotation). This assembly includes the metal piston, ring, two retainers and the pin. Replacing the piston assembly is not the simplest repair, but it is definitely something you can do yourself. You will need a screwdriver to remove the cover and a set of sockets and wrenches for the rest of the repair.
1. Removed shrouds
2. Removed engine from trimmer mount
3. Removed cylinder from block
4. Removed retaining rings from piston, pushed piston pin out, removed piston.
5. Reversed above procedure installing new piston
6. Installed piston ring, oiled piston and ring, then slid cylinder over piston
7. Bolt
... Read morecylinder down
8. Remove accessories from first cylinder and install on new cylinder
9. Reinstall engine on trimmer mount, reinstall shrouds
10. Start engine and adjust carburetor
I disassembled the outer plastic housing to gain access to the motor. Once I had access to the motor I performed the disassembly in the following order:
Removed the carburetor and spacer, held in with two screws. Removed and replaced paper gaskets.
Removed the exhaust and heat shield, held in with two screws. Rep
... Read morelaced exhaust gasket
Removed the cylinder, held in with two machined screws. Replaced rubber base gasket
Removed piston assembly and ring.
Cleaned and checked the piston and cylinder bore for gouges. Removed and replaced cylinder ring.
This part is in stock in our warehouse and will ship out within 1 business day of the order being placed.
New stock is on the way! On order parts usually ship within 7 business days.
Item is not in stock and usually ships 10-15 business days from the time you place your order.
This item is no longer being made by the manufacturer, and cannot be added to your shopping cart.
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Mail-In Recycling Rebate
Some of the parts we sell are eligible for mail-in rebates since we can recycle them. We will display any applicable rebates in your shopping cart. To redeem your rebate, contact Customer Service after you have received your part.
