0438054 JOHNSON PISTON & DIAPHRAGM ASSY.

Table 1
Required Tools    
Tool    Part Number    Part Description    Qty    
A     1U-7307     Governor Repair Fixture (1)     1    
B     1P-1855     Retaining Ring Pliers     1    
C     1P-1857     Retaining Ring Pliers     1    
D     1U-7606     Servo Block (1)     1    
E     1U-7277     Pin Punch     1    
F     1U-7635     Clevis Driver (1)     1    
( 1 ) Part of former 1U-9088 Governor Tool Group
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Note: Inspect all parts of the governor upon disassembly. For information on the reusability of components in the governor, refer to the Guideline For Reusable Parts And Salvage Operations, SEBF8434, "3100 Governor Inspection and General Information for Mechanical Governor Groups Used in 3114, 3116, and 3126 Engines Equipped with Mechanical Unit Injectors (MUI)". For information on cleaning the components in the governor, refer to the Cleaning Guide, SEBF8354, "Equipment And Chemical Recommendations Reference Manual".Note: Refer to Chart A "Parts to be Replaced During Rebuild" in Guideline For Reusable Parts And Salvage Operations, SEBF8434 for a list of components that need to be replaced during a governor rebuild. It is not necessary to replace the components in Chart A "Parts to be Replaced During Rebuild" if the governor is in the shop for a bench test or for minor repair.Note: Refer to Chart B "Parts Replacement Chart" in Guideline For Reusable Parts And Salvage Operations, SEBF8434 for a list of components that need to be replaced when the servo assembly is serviced.
Illustration 1 g00521797
Typical Governor (1) Bolt (2) Orifice for the dashpot (3) O-ring seal (4) Bolt (5) Cover (6) Cover assembly (7) O-ring seal (8) Shims (9) Rear spring seat (10) Retaining ring (11) Spacer (12) Piston assembly for the dashpot (13) Shims for the high idle governor (if equipped) (14) Spring pair (15) Spring seat assembly
Mount the drive gear end of the governor on the 1U-7307 Governor Repair Fixture (Tool (A) ).
Illustration 2 g00521798
Remove three bolts (4) .
Remove cover (5) .
Illustration 3 g00521800
Remove O-ring seal (3) from cover (5). Inspect the O-ring seal for wear or damage. If the O-ring seal is worn or damaged, use a new part for replacement.
Illustration 4 g00521801
Ensure that orifice (2) for the dashpot is not plugged. Also ensure that orifice (2) is tight in the casting.Note: The orifice for the dashpot may be drilled directly into the governor housing or the orifice may be a fitting that is staked into the governor housing. Ensure that all orifice fittings are staked into the governor housing before reassembly.