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- 4247 007 1002 STIHL Piston – Genuine OEM Pump Piston for SG 20 Sprayer
Description
4247 007 1002 STIHL Piston – Genuine OEM Pump Piston for SG 20 Sprayer
The STIHL Piston (4247 007 1002) is a genuine OEM replacement piston designed for select STIHL sprayers, including the SG 20 model. This piston is a critical internal component within the pump assembly, responsible for generating consistent pressure and ensuring reliable spray performance during professional spraying applications.
Pump pistons are essential for smooth operation and proper sealing inside the pump cylinder. Over time, pistons may wear, become damaged, or lose efficiency due to repeated pumping motion, chemical exposure, or aging seals. A worn piston can lead to reduced pressure, inconsistent spray output, or pump failure.
Replacing the piston with the correct genuine STIHL OEM part restores proper pump performance, pressure stability, and long-term reliability without needing to replace the complete pump unit.
Manufactured to STIHL factory specifications, this OEM piston ensures precise fitment, durable sealing performance, and dependable operation under demanding agricultural and landscaping conditions.
Product Details
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OEM Part Number: 4247 007 1002
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Brand: STIHL (Genuine OEM)
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Part Type: Pump Piston
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Application: Pump pressure generation and internal sealing
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Condition: New Genuine OEM Part
Function
This STIHL pump piston is designed to:
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Generate pressure within the sprayer pump assembly
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Maintain proper sealing inside the pump cylinder
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Replace worn, damaged, or inefficient pistons
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Restore consistent spray output and pump performance
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Support long-term reliability during repeated pumping cycles
⚠️ A worn piston may cause pressure loss, weak spraying, or pump malfunction.
Verify Fitment (Recommended)
Before ordering, confirm:
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OEM part number 4247 007 1002
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Your unit model matches those listed below
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Application matches your STIHL illustrated parts diagram
⚠️ Pump components are model-specific — always verify by OEM part number.
Compatibility
This genuine OEM piston fits:
Sprayers
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SG 20 (Pump assembly)
(Exact fitment depends on production version — always verify using OEM parts diagram.)
Installation Notes
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Relieve sprayer pressure before servicing
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Access pump assembly components as required
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Remove worn or damaged piston carefully
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Install new piston securely in correct position
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Reassemble pump and test for proper pressure output
⚠️ Ensure proper seating and lubrication for smooth operation.
Maintenance Tips
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Inspect pump pistons regularly during servicing
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Replace worn pistons promptly to prevent pressure failure
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Keep pump assembly clean to reduce debris wear
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Store sprayer in dry conditions to prevent corrosion
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Always use genuine STIHL OEM pump components for best performance

