HUB-CRANKSHAFT 7W5687 - Caterpillar

All Industrial EnginesDescription of Change: New clutch groups are used in the rear power take-off groups for Caterpillar-built Industrial Engines. The new clutch groups have: ... a sealed ball-type pilot bearing,... non-metallic clutch plates, and... main bearings that use grease as a lubricant instead of oil.Formerly, 3400 Series Industrial Engines used a two-piece roller bearing for the pilot bearing. Power take-offs for other industrial engines used a ball-type bearing. Some of these bearings were sealed and some needed lubrication at regular intervals. The new pilot bearing will give a common bearing design for all power take-off clutch groups. The new bearing will also give a longer service life in applications where the two-piece roller bearing was formerly used.
The clutch plates in the former clutch groups were made of sintered iron. In some applications, there was a problem with too much wear on the teeth of the clutch plate and drive ring. The result was a higher repair cost. The new non-metallic clutch plates will keep this wear to a minimum.
Some former clutch groups had a main bearing with oil lubrication. The new main bearings use grease as a lubricant. This will give a longer service life for the main bearing.
Adaptable As: The new clutch groups are a direct replacement for the former clutch groups. The part number of the new clutch groups and new power take-off groups are shown in the chart. INTERMEDIATE DUTY: Defined as two seconds slip per engagement maximum, but not more than one such engagement per hour.
HEAVY DUTY: Defined as four seconds slip per engagement maximum, but not more than one such engagement per hour.
Refer to "Technical Information File" TD6009 and TD6005 for horsepower and slide load capabilities of the new clutches.The following earlier IBF series clutches can be converted from oil lubricated main bearing to grease lubricated main bearings using information given in Special Instruction, Form No. SMHS8189.
Earlier clutches can be converted from "metallic" to "non-metallic" clutch plates to correct drive ring and clutch plate tooth wear problems. A cross reference of the improved clutch plates is as follows:
When the non-metallic clutch plates are installed, always inspect the drive ring teeth and replace if worn.
Engine News dated March 17, 1982, gives information on the new 5P3499 Pilot Bearing to replace 5P381 Pilot Bearing in clutches for use on 3406, 3408 and 3412 Engines.