JET 0027930 - Caterpillar

Do not allow any dirt or foreign material to get into the hydraulic system during assembly, connection of lines, when components are filled with fluid, or during any maintenance operation.
Solution
The following procedure has been developed in order to correct the malfunction. The procedure involves changes to the 230-8750 Pilot Lines Gp , 237-4427 Pilot Lines Gp , and the 261-5833 Pilot Lines Gp .
Table 1
Required Parts for the Update to the System for the Blade Float    
Item     Qty     Part number     Description    
1     1     131-1867     Hose As    
2     1     6V-9828     Cap As    
3     1     6V-8397     O-Ring Seal    
4     1     6V-8934     Reducer As    
5     2     4J-5477     O-Ring Seal    
6     1     6V-9836     Swivel Tee    
Illustration 1 g01981533
(A) Remove the hose and cap the fitting. (B) Add a tee to the hose connection, and the new hose and a reducer to the tee. (C) Remove the existing hose and connect the new hose.
Illustration 2 g01981956
View of the pilot lines group
Illustration 3 g01979793
View of the bottom of the joystick and the steering control
Remove the 240-5816 Hose As (D) .
Illustration 4 g01979814
(A) The view of the area A is rotated 90 degrees and the cap is installed.
Place the 6V-9828 Cap As (2) on the connection.
Illustration 5 g01979973
The view of area C is rotated 90 degrees.
Assemble the 131-1867 Hose As (1) to the tee by using one 4J-5477 O-Ring Seal (5) .
Illustration 6 g01979815
A view of the bottom side of the platform and the differential steering pump is installed.
Disconnect the 236-2255 Hose As (E) from the fitting.
Illustration 7 g01979817
The view of area B and the swivel tee is installed.
Then install the 6V-9836 Swivel Tee (6) by using the 6V-8397 O-Ring Seal (3). Connect the new 131-1867 Hose As (1) by using a 4J-5477 O-Ring Seal (5) and a 6V-8934 Reducer As (4). Then connect the 236-2255 Hose As (E) to the tee Assembly.