BASE AS-OIL FILTER 1890981 - Caterpillar

Attach the fabricated particle counter "low pressure in" suction tube to the S O S valve (13) on the filter cart. Refer to Illustration 9.Note: The fabricated suction tube can be made with parts that are listed in Table 3 and as shown in Illustration 9.
Attach the other end of the fabricated suction tube to the "low pressure in" port on the portable particle counter as called for in the Tool Operating Manual.Bottle Sample Procedure
Illustration 10 g01237489
(13) S O S valve
(14) 169-8373 Fluid Sampling Bottle
If collecting a bottle sample, use the same S O S valve (13) and a 169-8373 Fluid Sampling Bottle (14). Refer to Illustration 10.
Record an oil sample from the S O S valve (13) on the filter cart at the beginning of the filter cycle. Refer to Illustration 10.
During the filter cart operation, cycle the lift cylinders at least four times per half hour of the cart operation. Operation of the cylinders will cycle the clean tank oil into the hydraulic system and flush the more contaminated oil back into the tank.Note: The filtration procedure can be performed while running the engine.
At the halfway point of filtering the machine, stop the procedure and change the filters on the machine.Note: Changing the machine hydraulic filters halfway through the filtering process avoids opening the filter housing after the system has been cleaned. If the filter housing is opened after the filtration process is complete, the filter housing will become an inlet for contamination. The new filters can remain in place until the next scheduled filter change.Note: Change the machine filters at the normal maintenance interval, or when the filters are not operating at optimal performance.
Cycle the oil until the portable particle analyzer indicates that the oil has reached an acceptable level of a minimum ISO 16/13 or cleaner. Take a final oil sample and record the final ISO level before the machine is returned to the field.Note: When a portable particle analyzer is not available, refer to "Oil Compartment Filtration Times for 204-7392 Filter Cart" at the end of this document.
When the target ISO level or the time interval has been met, close the air supply valve (8) and disconnect the air supply hose (9). Refer to Illustration 8.
Disconnect the filter cart suction hose (5) from the suction port (4). Install the dust caps on the coupler and the nipple. Refer to Illustration 6.
Disconnect the filter cart discharge hose (7) from the discharge port (6). Install the dust caps on the coupler and the nipple. Refer to Illustration 7.
Remove the filler cap adapter (3). Store the cap in a clean location. Refer to Illustration 5.
Install the strainer and the lock ring in the hydraulic tank filler neck.
Install a clean filler cap (2). Refer to Illustration 3.
Check the hydraulic tank oil level.
Remove the wheel blocks.
Return the machine to service.Oil Compartment Filtration Times for 204-7392 Filter Cart
If an on-line portable particle counter is not available to diagnose and track when the contaminant level has lowered to an acceptable point,