X0202 4 2006-05-31 0000029644 DONALDSON CO INC DCI 0001226577 COOK WILLIAM M 1400 WEST 94TH STREET BLOOMINGTON MN 55431 0 1 0 0 Chairman, President and CEO Common Stock 2006-05-31 4 A 0 29.217 32.91 A 7478 I By Benefit Plan Trust Common Stock 3900 I By Spouse Common Stock 4378 I By Benefit Plan Trust (401(k)) Common Stock 38038 I By Benefit Plan Trust Common Stock 219870 D Share total converted from the 401(k) Donaldson Stock Fund which has a unitized price. Individual holds 53,794 shares indirectly and 219,870 shares directly. Norman C. Linnell, Attorney-in-fact for William M. Cook 2006-06-01