2012/08/29 A Liquid Sealant Prevents Leaks at the Flywheel Housing on Certain Excavators and Mobile Hydraulic Power Units {1157} Caterpillar

Excavator:

320D (S/N: DFB1-UP; ZGB1-UP; HJC1-UP; MZD1-UP; DHE1-UP; TAE1-UP; A6F1-UP; A8F1-UP; A9F1-UP; KGF1-UP; KTF1-UP; KZF1-UP; MGG1-UP; TDH1-UP; XCK1-UP; FAL1-UP; RBL1-UP; KLM1-UP; PCM1-UP; SPN1-UP; WBN1-UP; WJN1-UP; BZP1-UP; GDP1-UP; SNS1-UP; YDS1-UP; EJT1-UP; SCW1-UP; GMX1-UP; PCX1-UP; PHX1-UP; BWZ1-UP; JFZ1-UP)

321D (S/N: TXA1-UP; PBD1-UP; MPG1-UP; KBH1-UP; NAS1-UP; MDT1-UP; JCX1-UP; KBZ1-UP)

323D (S/N: RAC1-UP; WGC1-UP; SED1-UP; YSD1-UP; NDE1-UP; PBE1-UP; WNE1-UP; GTF1-UP; NZF1-UP; ZMF1-UP; CWG1-UP; JLG1-UP; LFL1-UP; BYM1-UP; NES1-UP)

Mobile Hydraulic Power Unit:

323D MHPU (S/N: DCJ1-UP)

Service Magazine SEPD1113, 20 April 2010, "A Liquid Sealant Prevents Leaks at the Flywheel Housing on Certain Excavators and Mobile Hydraulic Power Units". Disregard this article, see the article that follows.

ReferenceDisassembly and Assembly, RENR8614, "Main Hydraulic Pump - Remove"

ReferenceDisassembly and Assembly, KENR8106, "Flywheel Housing - Remove"

ReferenceDisassembly and Assembly, KENR8106, "Flywheel Housing - Remove and Install"

ReferenceDisassembly and Assembly, RENR8614, "Main Hydraulic Pump - Install"

A liquid sealant ThreeBond #1212 is now used on the flywheel housing for the machines that are listed above. If a gap exists between the main bearing cap and the crankcase, use the following rework procedure to prevent leaks.

Rework Procedure

1. Remove the main hydraulic pump.

2. Remove the flywheel.

3. Remove the flywheel housing.

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Illustration 1	g03190296

4. Apply a liquid sealant ThreeBond #1212 to the cylinder block. Refer to Illustration 1. The order to apply the sealant should be 1, 2, 3.

   Note: Keep the liquid sealant out of the bolt holes and inside the engine.

5. Install a new 294-1739 Gasket .

6. Install the flywheel housing.

7. Install the flywheel.

8. Install the main hydraulic pump.