PUMP G 6Y7494 - Caterpillar

Locate the existing center punch mark on the housings. This is shown in illustration 18.
Insert the correct drill into the spindle and secure the drill in place.
Clamp the housing onto the table and align the drill with the center punch.
Illustration 19 g01147507
Drilling of the external port face of the bearing carrier
Lower the drill into the housing. This is shown as "B" in illustration 19.
Drill until a complete connection with the internal passage is reached. Shown as "C" in illustration 19
Retract the drill from the housing.
Remove all burrs with a file or the de-burring tool.
Clean the passages with a solvent washout tank and cover with a 162-5791 lint free towel SAE Split Flange Porting
The table 8 shows the flange sizes, thread depth for the bolt holes and thread size for the bolt holes.
SAE split flange drill jig drawings are located on the HIS web site under the "Tooling tab".
Table 8
SAE Split Flange    
        Center Hole     Bolt Hole    
Flange Size     Drill Size     Thread Size     Drill Depth     Thread Depth    
3/4 inch    
19 mm (0.74 inch)     3/8 inch- 16    
25 mm (1.02 inch)    
14 mm (0.55 inch)    
1 inch    
25 mm (0.99 inch)     3/8 inch- 16    
25 mm (1.02 inch)    
14 mm (0.55 inch)    
1 1/4 inch    
32 mm (1.24 inch)     7/16 inch- 14    
30 mm (1.18 inch)    
17 mm (0.67 inch)    
1 1/2 inch    
38 mm (1.49 inch)     1/2 inch- 13    
32 mm (1.26 inch)    
19 mm (0.67 inch)    
Illustration 20 g01148221
Refer to the ""Jig Drawings "" in the ""Hydraulic Information System "" section of this guideline.
Locate the correct template. Lay out the pattern for the flange holes.Note: If the Jig Drawing templates are not available: Dimensions for the various flange bolt holes are found in tables 9, 10 and 11. Tables 9 through 11 correspond with illustration 21. Drilling and thread depth for the bolt holes are listed in Table 8.
Table 9
Caterpillar Split Flange bolt dimensions    
Flange Size     A     B     C     D    
3/4 inch -12    
23 mm (0.9 inch)    
51 mm (2.0 inch)    
12 mm (0.5 inch)    
25.4 mm (1.0 inch)    
1 inch -14    
28 mm (1.1 inch)    
57 mm (2.2 inch)    
14 mm (0.6 inch)    
28.7 mm (1.1 inch)    
1 1/4 inch -20    
32 mm (1.2 inch)    
67 mm (2.6 inch)    
16 mm (0.6 inch)    
33.3 mm (1.3 inch)    
1 1/2 inch -24    
37 mm (1.4 inch)    
80 mm (3.1 inch)    
18.3 mm (0.7 inch)    
38.1 mm (1.5 inch)    
Table 10
SAE Code 62 Split Flange bolt dimensions    
Flange Size     A     B     C     D    
3/4 inch -12    
23.9 mm (0.9 inch)    
50.8 mm (2.0 inch)    
11.9 mm (0.5 inch)    
25.4 mm (1.0 inch)    
1 inch