PISTON 1195393 - Caterpillar

The new filters are for power train use only and not approved for hydraulic applications.
Adaptable To: The new 341-6643 Oil Filter Element, 343-4464 Oil Filter Element, 328-3655 Oil Filter Element As, and 343-4465 Oil Filter Element are Advanced Efficiency Filters for power train arrangements that can be used to replace the following filters:Caterpillar recommends using the transmission filters below for transmission applications in place of the previously recommended hydraulic filters.
Table 1
Transmission Filters    
New Part Number     Replaces    
341-6643     1G-8878    
343-4464     132-8875
1R-0773    
343-4465     132-8876
1R-0778    
328-3655     1R-1809 (1)    
( 1 ) This part number has been discontinued. The replacement for hydraulic application is 338-3540 Oil Filter Element Contamination is one of the major causes of transmission control system failure. Some power train oil systems were cleaned with fine cleanout filters. This use of fine cleanout filters frequently caused the oil to bypass the filter. The use of ultra high efficiency filters in power train oil systems is no longer recommended. Caterpillar now recommends the use Cat Advanced High Efficiency Transmission Filters for power train applications. These new filters feature a synthetic media designed to deliver a high level of filtration performance and to reduce pressure drop across the media. The Cat Transmission Filters will increase filter life, perform better in cold weather, and during cold starts the instances of filter bypass are greatly reduced.