TUBE AS 2551939 - Caterpillar

Removal Procedure
Table 1
Required Tools    
Tool     Part Number     Part Description     QTY    
A     311-1362     Vacuum Gauge Gp     1    Start By:
Release the hydraulic system pressure.
Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
Open the engine hood.
Illustration 1 g03735881
Illustration 2 g03735891
Remove bolts (2), bolt (3), bolt (4), and sheet assembly (1) .
Illustration 3 g03736088
Illustration 4 g03736089
Remove bolts (7) and sheet assembly (5) .
Remove bolts (8) and sheet assembly (6) .
Illustration 5 g02545425
Typical Example.
Remove the cap from the hydraulic tank. Install Tooling (A) onto the hydraulic tank. Attach an air supply hose to Tooling (A). Apply 276 to 414 kPa (40 to 60 psi) of air. This procedure will pull vacuum on the hydraulic system.
Illustration 6 g03792502
Illustration 7 g03792503
Disconnect hose assemblies (10) from control valve (9) .
Remove three bolts (11) and control valve (9) .Installation Procedure
Install control valve (9) in the reverse order of removal.