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CS40EA Hitachi Chainsaw - Overview

Models starting with CS40EA

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Purge Bulb – Part Number: 12318139130
$9.80
In Stock
Purge Bulb
★★★★★
★★★★★
(3)
Part #12318139130
This OEM replacement part is used to pump fuel from the tank to the carburetor in order to start the engine. It may also be referred to as a Primer Bulb. It is made of durable black plastic and is sold individually. This part will be found in various locations, depending on your model; refer to your owners manual to locate it on your machine, but is commonly found on the side of the air cleaner or carburetor. To complete this repair, you will need a screwdriver. The Purge Bulb needs to be replaced when it is cracked or damaged. It will become fatigued through regular use and may leak fuel when it is malfunctioning. Customers rated this repair as Easy.
Return Grommet – Part Number: 6697846
No Longer Available
Return Grommet
Part #6697846
This individually sold grommet is a genuine OEM part and is used for a variety of different small engine/outdoor lawn equipment. The return fuel line from the carburetor is installed through this grommet, which creates a seal to prevent future leaks and ignition issues. Over time and through exposure to fuel, the grommet can wear down, leading to cracks, tears, and missing pieces. If you notice fuel is leaking during operation, or are having issues with starting the engine, this grommet may be the cause. Depending on your model, installing the return line in the grommet and then installing both together in the fuel tank may be easiest, rather than installing them separately.
Fuel Pipe – Part Number: 6699014
No Longer Available
Fuel Pipe
Part #6699014
This is a genuine OEM replacement part designed for Hitachi power equipment. The purpose of fuel line is to to return excess fuel back on the system. By pressing the primmer bulb it will fill the carburetor with fuel, once it is full the excess fuel will be forced back into the tank through the fuel return line. It is made out of rubber and it is sold individually. Over time the fuel lines will deteriorate and become brittle so they would need to be replaced.
Fuel Grommet (a) – Part Number: 6685308
No Longer Available
Fuel Grommet (a)
Part #6685308
This is a genuine replacement part sourced directly from original manufacturer. This grommet is connected to the fuel hose and the fuel filter helping to secure it to the fuel tank. It purpose is to secure the fuel shut off valve. It is made out of rubber and it is sold individually. No tools are needed to replace.
Metering Diaphragm – Part Number: 6684690
$18.86
Special Order
Metering Diaphragm
Part #6684690
This part is available as an individual replacement. The metering diaphragm goes between the diaphragm gasket and the diaphragm cover. During replacement, it may require a screwdriver to help install this item correctly. It is made of a thin material and will need to be replaced if it becomes broken. This is a genuine OEM sourced part which is specially designed for use with Tanaka and Hitachi blowers, chain saws, drills, trimmers, and saws.
Pump Gasket – Part Number: 6685212
$4.23
Special Order
Pump Gasket
Part #6685212
Pump Diaphragm – Part Number: 6685213
$8.31
Special Order
Pump Diaphragm
Part #6685213
Idle Adjust Spring – Part Number: 6690766
$6.40
Special Order
Idle Adjust Spring
Part #6690766
Stop Switch – Part Number: 6685364
No Longer Available
Stop Switch
Part #6685364
Trigger Lockout – Part Number: 6685350
$6.40
Special Order
Trigger Lockout
Part #6685350
Brake Link – Part Number: 6685388
$9.62
Special Order
Brake Link
Part #6685388
Tapping Screw D3X8 – Part Number: 6685415
$6.40
Special Order
Tapping Screw D3X8
Part #6685415
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Bulb was worn out and broken open
17 of 21 people found this instruction helpful.
  • Richard from SPRING HILL, FL
  • Really Easy
  • 15 - 30 mins
  • Pliers, Screw drivers
The unit is a press fit. To remove the old one required breaking the plastic compression tabs that hold it in place. That was simple enough. Replacing requires lining up in the correct position to meet the inner hose. Then push it in. The compression tabs on the replacement click in and hold.in place.
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