SHAFT 3F4598 - Caterpillar

Wheel Tractor-Scraper:
621H (S/N: DBK1-UP; HKK1-UP; NYY1-UP; EAZ1-UP)
623H (S/N: EDJ1-UP; DBF1-UP)
627H (S/N: LCT1-UP; DBW1-UP)
A new steering line assembly is now available on the machines listed above. The new steering line will not have any hoses attached to weldments on it when using certain starting arrangements, increasing its service life.The new steering line assembly is not a direct replacement. Additional parts are required to perform this update. Refer to the Rework Procedure and Required Parts List below.
Illustration 1 g03694435
New 455-0971 Line Assembly (1) replaces the former 383-3529 Line Assembly and 362-3549 Line Assembly in the 310-5528 Steering Lines Gp .Note: Use new hardware that is listed in Table 2 of rework procedure to install the new 455-0971 Line Assembly. The improved steering lines group will have the location change for the hydraulic oil sample port.New 455-0998 Hose As (2) replaces the former 382-9826 Hose As in the 382-2780 Hydraulic Oil Lines Gp. This improvement is applicable only on machines using 384-9430 Cold Weather Starting Ar and 382-2789 Cold Weather Starting Ar .The new 455-0971 Line Assembly and 455-0998 Hose As are adaptable to machines that are listed in Table 1.
Table 1
Sales Model     Adaptable to Machines    
621H     S/N:DBK1-UP    
S/N:HKK1-UP
S/N:NYY1-UP
S/N:EAZ1-UP
623H     S/N:EDJ1-UP    
S/N:DBF1-UP
S/N:LCT1-UP
627H     S/N:DBW1-UP    
Use the following rework procedure in order to update the steering lines group and hydraulic oil lines group on the machines listed above:Rework Procedure
Table 2
Required Parts List    
Item     Quantity     Part Number     Description    
1     1     455-0971     Line Assembly    
2     1     455-0998     Hose As    
3     2     6V-9746     O-Ring Seal    
4     1     6V-8076     Elbow    
5     2     3J-1907     O-Ring Seal    
6     1     6V-9877     Elbow    
7     2     3K-0360     O-Ring Seal    
8     1     9W-1686     Spacer    
9     1     4J-0522     O-Ring Seal    
10     1     5K-9090     O-Ring Seal    
11     1     1P-3704     Rectangular Seal    
12     4     8T-4178     Bolt    
13     4     8T-4121     Hard Washer    
14     1     7K-1181     Cable Strap    
-     1     9S-4185 (1)     O-Ring Plug    
-     1     3K-0360 (1)     O-Ring Seal    
( 1 ) Use part, if the machine is equipped with Standard Start Arrangement
Put a vacuum on the tractor hydraulic tank to minimize oil loss and disconnect all hydraulic lines.
Illustration 2 g03694442
View A
Remove the secondary steering flow switch (A), if equipped, from the former line assembly (B). Save the part.