2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 310Get this manual
2B-15 Front Suspension: Lower wishbone arm Inspect the knuckle end boot and lower wishbone arm for wear or damageIf any defects are found, replace the lower wishbone arm with new oneInspect the knuckle end smooth movementIf there are any abnormalities, replace the knuckle end with new oneDust seal Inspect the dust seal lips for wear or damageIf any defects are found, replace the dust seal with the new ones I933H1220064-01