SUPPORT AS-FRONT 1757327 - Caterpillar

3508 (95Y, 68Z, 70Z);
3512 (49Y, 65Z, 67Z);
3516 (27Z, 71Z, 73Z) Industrial: 3508 (23Z, 1ZF);
3512 (24Z, 3YF);
3516 (25Z, 4XF) Generator Set: 3516 (3RC) Spark-Ignited EnginesSUPPLEMENT: June 1994Engine News, December 1991, Page 1; "New Spider Assembly Used In Fan Groups".The picture caption "New 4P2522 Spider Assembly" is not correct. The correct picture caption is "New 4P7190 Spider Assembly".
The first sentence in the Adaptable To section of the article is not correct. The correct information follows: The new 4P7190 Fan Spider Assembly is a direct replacement for the former 7W3475 Fan Spider Assembly in the 7W5639 and 7W5642 Fan Groups.
--------------- END SUPPLEMENT ---------------Description of Change: A new fan spider assembly is used in the [1829 mm (72.0 in) diameter] fan groups. The new fan spider assembly has narrower blades. In addition, the new fan spider assembly has laminations which are narrower and progressively smaller in diameter. This results in lighter blades which reduce the stress on the rivets that fasten the blades to the fan hub. Although the new fan spiders have narrower blades, the air flow is the same for both the new and former fan spider assemblies. In addition to the blade changes, the hub of the new fan spider assembly is made from a stronger steel.
New 4P2622 Spider Assembly.
Former 7W3475 Spider Assembly.Adaptable To: The new 4P2622 Spider Assembly is a direct replacement for the former 7W3475 Spider Assembly in the 7W5639 and 7W5642 Fan Groups. The former fan spider assembly is canceled.