PISTON AS 2959692 - Caterpillar

Check differential pressure gauge (5) follower needles for readings above 172 kPa (25.0 psi) to help identify which filters are restricted.
Once all restrictions are corrected, reset slug valve (18) by moving lever from "TRIPPED" position to "SET" position.
Illustration 41 g02727570
Typical Slug Valve (18) Shown in SET PositionNote: If slug valve (18) will not reset, or immediately closes again, refer to the ""Troubleshooting"" Section in this manual, or contact your local Cat dealer for assistance.
Slug valve is factory set to 172 kPa (25.0 psi) differential pressure. Do NOT adjust factory setting. Changing the setting can result in improper fuel filtration and damage to bulk fuel filtration system components.
Note: To ensure fuel quality, have fuel cleanliness tested on a regular basis. For more information on fuel quality testing, refer to the latest version of Special Instruction, SEBU6250, "Caterpillar Machine Fluid Recommendations".Service Parts
Illustration 42 g02727573
Typical Filter Elements
Table 3
Service Parts    
Item     Part No     Description     Qty    
(24)     323-0183     Pre-filter Element Kit 1     1    
(25)     299-2372     Coalescer Element Kit 2     1    
(26)     301-9814     Separator Canister 3     8    
    307-0655     Optional Heater (120 VAC)     1    
    307-2569     Optional Heater (240 VAC)     1    
1 Includes three pre-filter elements and one pre-filter vessel o-ring seal. 2 Includes eight coalescer elements and one coalescer vessel o-ring seal. 3 Separator canisters do not require replacement unless damaged or corroded.    Troubleshooting
Table 4
Troubleshooting Chart    
Problem     Possible Cause     Possible Solution    
No fuel flow.     Inlet or outlet valve is closed.     Completely open inlet/outlet valve.    
Fuel hose is kinked. Straighten hose and/or provide larger hose.    
Automatic slug valve shutdown. Check differential pressure gauge follower needles for differential pressure reading greater than
172 kPa (25.0 psi). The slug valve will close if filters are restricted. Change filter elements and reset slug valve.    
Check sight glass for high water accumulation. Wait until system purges water or drain water manually. Reset slug valve.
Differential gauge reading greater than
69 kPa (10.0 psi) at start-up.     Air in the system.     Open vent valve at top of pre-filter vessels to release trapped air.    
Differential gauge reading greater than
172 kPa (25.0 psi).     Filter elements are restricted.     Replace filter elements and clean vessels. Reset slug valve, if necessary.    Maintenance Record
Replace filters at least every 6 months. Clean debris from vessels annually, or as needed to maintain cleanliness.
Table 5
295-0048 Bulk Fuel Filtration Group Maintenance Record    
Date     Maintenance Description     Performed By