TUBE AS 3727526 - Caterpillar

Removal Procedure
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines.Dispose of all fluids according to local regulations and mandates.
Illustration 1 g00448807
Remove three bolts (1), (2) and (3) and the brackets from the fuel injection lines.
Illustration 2 g00448808
Disconnect six fuel injection line nuts (4) from the fuel injection pumps.
Do not allow the tops of the nozzles to turn while the fuel lines are loosened. The nozzles will be damaged if the top of the nozzle turns in the body. Defective fuel nozzles will damage the engine due to incorrect spray patterns.
Illustration 3 g00448809
Hold the tops of fuel injector nozzles (5) with a wrench, as shown. Loosen the six fuel injection line nuts at fuel injector nozzles (4) .
Disconnect the fuel injection line nuts at the fuel injector nozzles and remove the fuel injection lines. Put caps and plugs on all openings immediately in order to prevent dirt from contaminating the fuel system.Installation Procedure
Table 1
Required Tools    
Tool    Part Number    Part Description    Qty    
A     5P-0144     Fuel Line Socket     1    
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Do not allow the tops of the nozzles to turn while the fuel lines are loosened. The nozzles will be damaged if the top of the nozzle turns in the body. Defective fuel nozzles will damage the engine due to incorrect spray patterns.
Remove the protective covers from the fuel line connections. Place the fuel injection lines in position on the engine. Tighten the fuel injection line nuts on the fuel injection pump and the fuel injector nozzles finger tight.Note: The nozzle assembly must be supported with a wrench.
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Hold the tops of fuel injector nozzles (1) and use Tool (A) in order to tighten the fuel injection line nuts to a torque of 40 7 N m (30 5 lb ft).
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Tighten six fuel injection line nuts (2) at the fuel injection pumps to a torque of 40 7 N m (30 5 lb ft).
Illustration 6 g00475546
Install the brackets and three bolts (3), (4) and (5) that hold the fuel injection lines in position.
Prime the fuel system. Refer to the Operation and Maintenance Manual, "Fuel System - Prime" topic (Maintenance Section).