CASE-DIFFERENTIAL 3644390 - Caterpillar

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Note: Be sure to mark the orientation of each of the gears for installation purposes.
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Remove bolts (2) and thrust plate (1) .
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Remove seal assembly (3) and adapter (4) .
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Remove O-ring seals (5) and (6) from seal assembly (3) .
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Remove bolts (8), plate (9), and adjustable idler gear (7) .
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Check the condition of bearing (10) in adjustable idler gear (7). If bearing (10) is worn or damaged, use a new part for replacement. Use Tooling (A) to replace bearing (10) in adjustable idler gear (7) .
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Remove bolts (12), plate (13), and idler gear (11) .
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Check the condition of bearing (14) in idler gear (11). If bearing (14) is worn or damaged, use a new part for replacement. Use Tooling (A) to replace bearing (14) in idler gear (11) .
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Remove bolts (16), plate (17), and cluster gear (15) .
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Check the condition of bearing (18) in cluster gear (15). If bearing (18) is worn or damaged, use a new part for replacement. Use Tooling (A) to replace bearing (18) in cluster gear (15) .
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Note: Shaft assemblies (19) and (20) must be removed in order to remove plate (23) .Note: If the nuts and the bolt for shaft assembly (19) are loosened, or if shaft assembly (19) is removed or moved in any way, the backlash for the camshaft gear and adjustable idler gear (7) will need to be readjusted at assembly. The backlash will also need to be readjusted if the cylinder head was replaced. Refer to Testing and Adjusting, "Gear Group (Front) - Time".
Check the condition of shaft assembly (19). If the bearing diameter of the shaft is worn or damaged, remove the nuts and the bolt and replace shaft assembly (19) with a new part.
Check the condition of shaft assembly (20). If the bearing diameter of the shaft is worn or damaged, remove the nuts and the bolt and replace shaft assembly (20) with a new part.
Check the condition of shaft (21). If the bearing diameter of the shaft is worn or damaged, remove bolts (22) and replace shaft (21) with a new part.
Remove bolts (24) that hold plate (23) to the cylinder block. Remove plate (23) .
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Remove gasket (25) and O-ring seals (26) from the cylinder block.Note: On newer blocks, an integral seal is used instead of O-rings (26) and gasket (25) .