SEAL-LIP TYPE 5P0547 - Caterpillar

Engine: 3508B (S/N: CNB1-UP; PTN1-UP; BGX1-UP) 3512B (S/N: CMC1-UP; BLF1-UP; PTF1-UP; BRK1-UP; PTM1-UP) 3516B (S/N: CPA1-UP; BMB1-UP; BPJ1-UP; FDN1-UP; PPS1-UP)Introduction
This Special Instruction provides the information that is necessary to install the 234-8721 Box Group All 3500B Engines are controlled by an Electronic Control Module (ECM). The ECM monitors engine RPM. The ECM will also disable fuel injection when an overspeed condition occurs. The 234-8721 Box Group provides redundant overspeed protection through an independent speed sensing system. When the 234-8721 Box Group is activated, the Box Group interrupts power to the ECM. The engine will shut down.Note: Reference 236-2104 Mounting Group for cylinder head rocker box mounting details.The 236-2104 Mounting Group includes the parts that are listed in Table1.
Table 1
236-2104 Parts List (1)    
Quantity     Part Number     Part Name    
1     234-8721     Box Group    
1     1W-8129     Support    
1     236-1143     Bracket    
2     0S-1588     Bolt 3/8 - 16    
2     1A-5964     Bolt 3/8 - 16    
2     5N-2894     Washer - Hard    
4     5S-7349     Bolt 1/4 - 20    
4     8T-4205     Washer - Hard    
2     9S-8752     Nut Full 3/8 - 16    
( 1 ) 236-2104 Mounting Group is not available as a kit. The parts listed below need to be ordered separately.Operation
234-8721 Box Group is equipped with a two-position switch labeled OFF/RESET and ON. With the switch in the ON position, the green lamp labeled "SPEED SWITCH POWER" will be lit. In the event of an engine overspeed shutdown triggered by the 234-8721 Box Group , the red lamp labeled "ENGINE OVERSPEED" will be lit. After troubleshooting and correcting the cause for the overspeed, the selector switch needs to be momentarily placed in the OFF/RESET position. Placing the two-position switch in the OFF/RESETposition,will reset the speed switch.Return the selector switch to the ON position for normal operation.To disable the Box Group in the event of a component failure, perform the following two steps.
Place the two-position switch in the ON position.
Place the circuit breaker that is contained in the 234-8721 Box Group in the OFF position.By performing the two steps above, the 234-8721 Box Group is deactivated. This allows the engine to operate without the redundant overspeed protection system. The engine will continue to be protected by the ECM.Installation Instructions
Note: For EPG engines manufactured after 1January 2004, skip steps 2 through 5 and remove the ECM power connector jumper plug and install the 6 pin Deutsch connector in the ECM power connector. For engines manufactured before 1January 2004, use steps 2 through step 5.
Mount the 234-8721 Box Group on the side of the engine on the cylinder head rocker box. If the box group is not mounted on the engine, it must be located where the magnetic pickup harness will reach the flywheel housing. Also make sure the six wire ECM harness will reach the engine ECM
Remove