VALVE GROUP 8J5398 - Caterpillar

Make sure all lines and hoses are correctly connected and all connections are tight.
Start the machine and operate the engine at low idle. Check and make sure that none of the hose coupling and/or filter cart connections are leaking. If the cart is mounted onto the vehicle, securely fastened to the machine.
Actuate the hydraulic implements to bring the hydraulic system and oil up to operating temperature. Any remaining contamination in the oil will be placed in suspension.
Perform a particle count test to establish a baseline contamination level.
If the hydraulic oil is being cleaned with the machine in a stationary position, put the throttle at medium idle, and operate the implements for 5 to 10 times repeatedly.Note: Do not operate the travel circuits, unless the filter cart is mounted to the machines frame.
Continue to actuate the implements during the filtering process. Actuation keeps the contaminants in suspension and causes the oil in remote lines, cylinders, motors, and valves to go back to the cart for filtering.
Perform a particle count test and compare the results to previous tests. Refer to the ""Oil Cleanliness"" Section for additional information. If the hydraulic system is being filtered while the machine is operating (mobile), perform particle count analysis after 1 hour of operating time. Compare the results to previous tests.
Continue filtering the oil and taking particle count checks until the range number has decreased by one number (refer to Table 1). Because of the differences between machine hydraulic systems, a time estimate for oil cleanup is not possible.
Illustration 7 g02798868
"Dirty Filter " IndicatorNote: The filter carts are equipped with "Dirty Filter " indicators that must be periodically checked as the filter cart operates. Replace the filter elements whenever the indicators show filters are dirty or plugged. When the filter elements on the filter cart are changed, the return filter in the machines hydraulic tank should also be changed.Parts for High-Pressure Hose Assemblies
Table 3
Parts for High-Pressure Hose Assemblies    
Part No.     Desc.     Specification    
Threaded Adapter -
41340 kPa (6000.0 psi)    
4C-5088     Coupling     1 NPTF internal thread x 1 5/8-12 STOR external thread    
4C-5087     1 5/8-12 STOR x 1 5/8-12 STOR
4C-5091     1 5/16-12 STOR external thread x M30 x 2 external thread
4C-5090     1 5/16-12 STOR external thread x M30 x 2 internal thread swivel
4C-5089     1 5/16-12 STOR external thread x 1 3/16-12 ORFS internal thread 90 degree swivel
4C-5092     1 5/16-12 STOR internal thread x 1 5/8-12 STOR external thread
Hose End Fittings    
4C-8767     Reusable
Coupling     1.00 XT-5 Hose (1 5/16-12 STOR external thread) used with 5P-0477 Sleeve    
4C-6461     1.25 XT-5 Hose (1 5/8-12 STOR external thread) used with 5P-0477 Sleeve
4C-6462     1.25 XT-5 Hose (1 5/16-12 STOR external thread) used with 5P-0477 Sleeve
Quick Disconnect Couplers and Nipples    
9U-5076     QD Coupler Nipple     3/4-12 internal thread    
9U-5075     3/4-12 external thread
4C-6481     1-12 internal thread
4C-6482     1-12 external thread
4C-5094     1 1/4-12 internal thread
4C-5093     1 1/4-12 external thread
Hydraulic