Fits JD Style AT153936 Arm Cylinder Bushing 490EOne New Aftermarket Replacement Arm Cylinder Wear Ring (Bushing) Fits John Deere (Fits JD) 490E Excavator This aftermarket replacement arm cylinder wear ring (also referred to as a cylinder bushing or guide ring) fits the arm cylinder on the Fits John Deere 490E crawler excavator. The wear ring centers the piston within the hydraulic cylinder bore, absorbs lateral and transverse forces, and prevents metal to metal contact protecting cylinder walls,
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