0390509 JOHNSON RING SET, Std. 235

Introduction
There have been isolated instances of issues with 353-3571 Filter Tube that are installed on certain 938H Machines with a C6.6 engine.The fuel system can have four different types of tube assemblies installed between the secondary fuel filter assembly and the fuel injection pump. Previous Special Instruction, REHS3755, "New Tube Assembly for the Low-Pressure Fuel System on Certain C6.6 Machine Engines" for further information.Inspect the machine in order to determine the configuration of the low-pressure fuel system. Refer to Illustration 1 and Illustration 5 in order to determine the configuration of the low-pressure fuel system.Refer to ""Removal Procedure for Type One Low Pressure Fuel System"" for the required parts for a type one low-pressure fuel system.Refer to ""Removal Procedure for Type Two Low Pressure Fuel System"" for the required parts for a type two low-pressure fuel system.Removal Procedure for Type One Low Pressure Fuel System
Required Parts
Table 1
Required Parts    
Tool     Part Number     Part Description     Qty    
A     278-4138     Fuel System Protection Gp     1    
Ensure that all adjustments and repairs that are carried out to the fuel system are performed by authorized personnel that have the correct training. Before beginning ANY work on the fuel system, refer to Operation and Maintenance Manual, General Hazard Information and High Pressure Fuel Lines for safety information. Refer to System Operation, Testing and Adjusting, Cleanliness of Fuel System Components for detailed information on the standards of cleanliness that must be observed during ALL work on the fuel system.
For the O-ring seal, flat face connections type tube assembly. A full replacement of all the fuel system components should be carried out.
Illustration 1 g03645462
O-ring seal, flat face connections type tube assembly
Turn the fuel supply to the OFF position.
Turn the battery disconnect switch to the OFF position.
Illustration 2 g03645634
Typical example
Illustration 3 g03645653
Disconnect tube assembly (5). Use Tooling (A) to cap the connection on the secondary fuel filer assembly. Use Tooling (A) to cap the tube assembly.
Disconnect plastic tube assembly (4). Use Tooling (A) to cap the connection on the secondary fuel filer assembly. Use Tooling (A) to plug the plastic tube assembly.
Disconnect plastic tube assembly (6). Use Tooling (A) to cap the connection on the fuel filer. Use Tooling (A) to plug the plastic tube assembly.
Remove bolt (8) the bracket. Remove the plastic tube assembly from clip (7) .
Remove existing secondary fuel filter base (3). Refer to Disassembly and Assembly, "Fuel Filter Base - Remove and Install (Secondary Fuel Filter)" for the correct procedure.
Discard the secondary fuel filter base. Retain the two 6I-0593 Bolts .
Remove bracket (2) 311-1737 Bracket As . Retain the bracket and the nuts.
Illustration 4 g03645417
Typical example
Remove crankcase breather canister (15). Refer to Operation and Maintenance Manual, "Crankcase Breather (Canister) - Replace" for the correct procedure.
Remove bolts (14). Remove fuel injection line (12). Refer to Disassembly and Assembly, "Fuel Injection Lines - Remove" for the correct procedure.
Remove and retain the fuel injection line mounting clips (13) .
Remove bolts (9) and remove bracket (10). Retain the three 6I-0260 Bolts .
Disconnect tube assembly (4) from the fuel injection pump. Remove connection (11) from the fuel injection pump. Use Tooling (A) to plug the fuel injection pump.Removal Procedure for Type Two Low Pressure Fuel System
For the tube assembly with plastic section incorporated between the two steel sections. Replacement of tube assembly only for fuel system should be carried out.Required Parts
Table 2
Required Parts    
Tool     Part Number     Part Description     Qty    
A     278-4138     Fuel System Protection Gp     1    
Ensure that all adjustments and repairs that are carried out to the fuel system are performed by authorized personnel that have the correct training. Before beginning ANY work on the fuel system, refer to Operation and Maintenance Manual, General Hazard Information and High Pressure Fuel Lines for safety information. Refer to System Operation, Testing and Adjusting, Cleanliness of Fuel System Components for detailed information on the standards of cleanliness that must be observed during ALL work on the fuel system.