BOLT 8T0667 - Caterpillar

Generator Set:
C15 (S/N: PEC1-UP; C5E1-UP)
C18 (S/N: PEE1-UP; PEJ1-UP; EKW1-UP)
C27 (S/N: EGG1-UP; R8W1-UP)
C32 (S/N: SXC1-UP)
3512B (S/N: ZAH1-UP)
Engine:
3126B (S/N: BEJ1-UP)
3412E (S/N: 4CR1-UP)
3508B (S/N: S2A1-UP; CNB1-UP; S2B1-UP; 3DM1-UP; PTN1-UP; 2HW1-UP; 3DW1-UP)
3512B (S/N: PTF1-UP; S2G1-UP; S2H1-UP; PTM1-UP; 8EM1-UP; 1PW1-UP; 4AW1-UP)
3512C (S/N: LLK1-UP; RMS1-UP; LLT1-UP)
3516B (S/N: PTC1-UP; LEK1-UP; CBN1-UP; 7RN1-UP; S2P1-UP; S2R1-UP; S2W1-UP; 1NW1-UP; 2FW1-UP; S2Z1-UP)
3516C (S/N: PAG1-UP; JTS1-UP)
C-10 (S/N: BCX1-UP)
C-12 (S/N: BDL1-UP)
C-9 (S/N: CLJ1-UP)
C175-16 (S/N: M6A1-UP; M6B1-UP; P6L1-UP)
Industrial Engine:
3412E (S/N: BDT1-UP)
C-15 (S/N: BEM1-UP)
C-16 (S/N: BFM1-UP)
Marine Engine:
C280-12 (S/N: TSJ1-UP; RDW1-UP)
C280-16 (S/N: NKB1-UP; TDX1-UP)
C280-6 (S/N: SCB1-UP; LDL1-UP)
C280-8 (S/N: PKA1-UP; NDT1-UP)
Petroleum Engine:
3508C (S/N: LLC1-UP; C8E1-UP)
3512C (S/N: LLA1-UP; LLB1-UP)
3516C (S/N: PES1-UP)
Petroleum Power Train Package:
C32 (S/N: PEF1-UP; PEK1-UP)
Engine News SEBD9414, 25 September 2006, "Calibration of the 175-4998 Signal Converter ". The original article has been revised to add effectivity. Also, the part number of a wicking sealant was canceled. Refer to the effectivity above and the information below.
Illustration 1 g01306182
A new calibration procedure is now used on the 175-4998 Signal Converter. The new calibration procedure adjusts both of the potentiometers on the signal converter. The new procedure also secures the offset potentiometer in place once the adjustments have been made. The procedure ensures that the signal converter is properly calibrated.A functional test that verifies the zero, the middle point, and the maximum of the performance curve is performed at the factory. The functional test checks the operation of the 175-4998 Signal Converter. The effective date of the functional testing is 11August 2006.Calibration Procedure for the 175-4998 Signal Converter
Table 1
Required Tools    
Part Number     Tool    
146-4080     Digital Multimeter Gp    
9S-3263     Thread Lock Compound    
n/a     Loctite Threadlocker 290 50mL    
n/a     0 – 200 mA Current source    
Do not exceed 230 mA of current into the converter input. Electrical damage to the module will occur.
Remove electrical power from the Electronic Instrument Panel (EIP).
Illustration 2 g01304591
Typical example (1) "OFFSET" potentiometer (2) "SPAN" potentiometer
Remove the input wire for the system and any input signal that is connected to terminal 1 of the converter.Note: Do not remove the wires from terminal 10 or from terminal 12. Terminal 10 and terminal 12 are the outputs for the converter. For proper operation of the converter, terminal 10 and terminal 12 must remain connected to the Electronic Control Module (ECM). The converter will not function without completing the above circuit.
Restore power to the EIP.
Use the 146-4080 Digital Multimeter Gp to measure the duty cycle of the converter output. The duty cycle of the converter output is measured across terminal 10 and terminal 12.
Verify that the input wire is disconnected from terminal 1. Adjust "OFFSET" potentiometer (1) in order to provide a 5 percent duty cycle. Once the potentiometer is set for an output of 5 percent duty cycle, apply Loctite Threadlocker 290 in order to secure the potentiometer in place. Securing the potentiometer at 5 percent will ensure that the offset is calibrated correctly.Note: When an external current source is used for testing, disconnect the signal lines from the Silicon Controlled Rectifier (SCR). Also,