JOINT 2H9250 - Caterpillar

Transmission Case Inspection
Illustration 1 g03404022
TH48-E80 transmission case
Measure the transmission case to find the lengths of (A) and (B) as shown in Illustration 1
If (A) measures 126.6 mm (5.0 inch) and (B) measures 254.4 mm (10.0 inch), then no case rework is required to update the transmission to the wide gear planetary set.
If (A) measures 101.6 mm (4.0 inch) and (B) measures 279.4 mm (11.0 inch), then case rework must be performed to update the transmission to the wide gear planetary set.Case Rework Procedure
Illustration 2 g03404367
The highlighted plate must be lengthened by 31.75 mm (1.25 inch) to allow clearance for the planetary.
Illustration 3 g03404955
(C) 92.075 mm (3.625 inch) (D) 133.35 mm (5.25 inch) (E) 221.8 mm (8.732 inch)
Make a cut in the transmission case next to the existing plate. Refer to Illustration 3 for dimensions of case material removal.
Illustration 4 g03405000
(E) 221.8 mm (8.732 inch) (F) 152.4 mm (6.00 inch) radius (G) 1.6 0.5 mm (0.063 0.0197 inch) (H) 17.3 degrees (I) 84 degrees (J) End of plate (K) 6.35 mm (0.250 inch) (1) Sidewall plate
Illustration 5 g03405587
(E) 221.8 mm (8.732 inch) (2) End plate
Fabricate the two plates needed to extend the sidewall plate and box it in. Refer to Illustration 4, Illustration 5, and table 1 for plate information.Note: Use only steel with a 250 MPa (36259.5 psi) yield strength combined with good weldability to fabricate plates (1) and (2).
Table 1
Sidewall Plate Bend Data    
Development length     I - J    
228.1 mm (8.980 inch)    
Straight length     IJ    
1.6 mm (0.063 inch)    
Angle     I     84 degrees    
Arc length     J    
226.5 mm (8.917 inch)    
Illustration 6 g03405699
(2) End plate
Tack the end plate to the transmission case as shown in Illustration 6.
Illustration 7 g03405982
(1) Sidewall plate (2) End plate
Tack sidewall plate (1) to the transmission case and end plate (2) .
Cut off excess from end plate (2) so that it is flush with the sidewall plate.
Illustration 8 g03406019
(1) Sidewall plate (2) End plate
Complete the welds between the transmission case, sidewall plate, and the end plate. Allow to cool naturally.
Illustration 9 g03406029
(2) End plate
Measure the dimension from the end plate to the transmission case flange. Ensure that the measurement is 254.4 mm (10.0 inch) after the modification is complete.
Illustration 10 g03406049
Once the seams have been fully welded, cooled, and are leak free, repaint the transmission case.