See part E-28 in the diagram

Lower Retaining Washer 147490

Works with your model 51909!

$22.48

Works with your model 51909!

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This part works with the following brands:

This part works with the following products:

Part# 147490 replaces these:

147490,

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This part works with the following models:

ERP Number: ERP9262780
Manufacturer Part Number: 147490

Brand	Model Number	Description
Toro	51620	Trimmer - 31cc Curved Shaft Trimmer
Lawn Boy	51638	Trimmer - 28 cc Curved Shaft Trimmer
Toro	51653	Trimmer - 28cc Straight Shaft Trimmer
Lawn Boy	51908	Trimmer - 18" Brush Cutter
Toro	51909	Trimmer - Trimmer
Lawn Boy	51918	Trimmer - 18" Brush Cutter
Toro	51919	Trimmer - 18-Inch Brush Cutter
Lawn Boy	61620	Trimmer - 16" Gas Trimmer
Lawn Boy	61638	Trimmer - 16" Gas Trimmer
Lawn Boy	61653	Trimmer - 18" Gas Trimmer
Ryobi	GBC2818	Leaf Blower / Vacuum - Singer Gbc2818 - Blowers
Ryobi	IDC580	Trimmer - Ryobi Idc580 (206042751) Parts
Ryobi	IDC580-1	Trimmer - Ryobi Idc580-1 (910019701-009093700) Parts
Ryobi	IDC580-2	Trimmer - Ryobi Idc580-2 (009093701-105073600) Parts
Ryobi	LE720R	Edger - Lawn Edger
Ryobi	SUPREME	Trimmer - Ryobi Idc580 Supreme (811097001-910019700) Parts