Caterpillar: Servicemen's Reference book for Diesel engines, D2 Tractor Parts book and D2 Tractor operation and maintenance instruction manual. $75. for all three. Caterpillar D333 and G333 engines service manual $50. Caterpillar No.44 Hydraulic Control Parts book $25. Caterpillar D333 engine parts book $15. Wisconsin air cooled heavy duty engines instruction book and parts list Model VG4D $25. Oliver OC-4 and OC-46 Tractor shop manual $25.