New E-Stop Contact Blocks Are Now Used on Certain Cat® Engines {1408, 7418} Caterpillar

Electric Power Generation

3512B GENSET (S/N: K7E1-140)

3516B GEN SET (S/N: K7F1-131)

3516C GEN SET (S/N: SBK1-2549)

C175-16 GEN SET (S/N: WYB1-2112)

Engine

3512 (S/N: JM21-112; YBA1-448; YAX1-1343)

3512B (S/N: JM31-118; JM41-102; LY81-234; YBB1-588; YBC1-148; 8RM1-2239; YAN1-92004; YAY1-92002; YAZ1-870)

3512C (S/N: YBD1-527; LYH1-203)

3516 (S/N: JCG1-107; YAL1-719; YAS1-1016)

3516B (S/N: GD31-157; JCH1-152; JCN1-409; 7RN1-2266; YAP1-92030; ZBP1-306; YAR1-938; GZS1-954; GZT1-178)

3516C (S/N: SCJ1-1007; SFJ1-934; SCK1-1007; SEK1-1280)

3516E (S/N: LCK1-119)

C175-16 (S/N: WYC1-2013)

C175-20 (S/N: BXR1-1969)

Generator Set

C27 GEN SET (S/N: 2A31-296; GDS1-1066; T4Z1-483)

C32 GEN SET (S/N: AL61-251; K7C1-975; NRC1-538; SXC1-92020; JSJ1-92001; FLX1-351; JAZ1-4190)

Power Module

PM3516 (S/N: NBR1-952)

XQC1200 (S/N: N1G1-120)

XQC1600 (S/N: N1M1-315)

Description Of Change: The new contact blocks are gold plated and can operate on low voltage and low current. Also, the new contact blocks have an improved ability to recognize the emergency stop event resets in the engine ECM and EMCP.

Adaptable To:

Show/hide table

Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.

The following changes are adaptable to the products within the listed serial numbers, and are effective with all products after the listed serial numbers.

The new and former contact blocks are listed in Table 1.

Table 1

New Part Number	Part Name	Former Part Number
539-6661	Contact Block	442-6218
539-6662	Contact Block	442-6215
539-6663	Contact Block	442-6213

The 539-6661 Contact Block has 2 Normally Closed contacts.

The 539-6662 Contact Block has 1 Normally Open contact and 1 Normally Closed contact.

The 539-6663 Contact Block has 1 Normally Open contact.

Illustration 1	g06285875
Correct position of the 539-6663 Contact Block

Illustration 2	g06285879
Incorrect position of the 539-6663 Contact Block

Ensure that the 539-6663 Contact Block is used in middle. Incorrect placing of this block may lead to contact sticky operation.