STEM AS-VALVE 5578120 - Caterpillar

Disassembly Procedure
Table 1
Required Tools    
Tool    Part Number    Part Description    Qty    
A     FT-1820     Fixture Assembly     1    
B     1P-1855     Retaining Ring Pliers     1    
C     6V-9072     Guide     1    Start By:
Remove the fuel ratio control. Refer to Disassembly and Assembly, "Fuel Ratio Control - Remove".
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Illustration 1 g00460737
Remove cover (1) and O-ring seal (2) .
Personal injury can result from parts and/or covers under spring pressure.Spring force will be released when covers are removed.Be prepared to hold spring loaded covers as the bolts are loosened.
In order to release the spring force, hold cover (3) in position and slowly remove the two bolts that hold cover (3) in place.
Illustration 2 g00460791
Remove spring (4), washer (5) and diaphragm (6) from retainer (7). Remove retainer (7) from housing (8) .
Illustration 3 g00460793
Remove nut (13) from valve extension (12) and remove valve extension (12) from retainer (7). Remove stem (9) from valve extension (12). Remove spring (10) and O-ring seal (11) from valve extension (12) .
Illustration 4 g00460795
Remove spring (14) and retainer (15) from housing (8) .
All parts should be cleaned and inspected. Replace all parts that are worn or damaged.