Procedure to Replace the Full Open Labyrinth with the Partial Open Labyrinth Motor Housing on the Final Drives for Certain Excavators and Mobile Hydraulic Power Units {4050} Caterpillar

Procedure to Replace the Full Open Labyrinth with the Partial Open Labyrinth Motor Housing on the Final Drives for Certain Excavators and Mobile Hydraulic Power Units {4050}

Usage:

352F-VG A9J

Excavator: 349D (S/N: FLA1-UP; JGB1-UP; WTD1-UP; GKF1-UP; NNF1-UP; KLH1-UP; RBJ1-UP; MEN1-UP; KHS1-UP); 349D2 (S/N: FH31-UP; CE41-UP; FE51-UP; XAC1-UP; PFD1-UP; YAE1-UP; ZAE1-UP; YAG1-UP; TAH1-UP; SDM1-UP; RAN1-UP; GAX1-UP); 349E (S/N: FJB1-UP; ETC1-UP; DGE1-UP; FKF1-UP; SPG1-UP; TFG1-UP; RGH1-UP; KCN1-UP; MZW1-UP; KFX1-UP; MPZ1-UP; WHZ1-UP); 349F (S/N: BZ21-UP; FH21-UP; KEA1-UP; HLB1-UP; HPD1-UP; SFG1-UP; RAX1-UP); 352F (S/N: SD21-UP; TS21-UP; NDC1-UP; YEG1-UP; A9J1-UP; XAL1-UP; KBP1-UP; MDR1-UP)
Mobile Hydraulic Power Unit: 349D MHPU (S/N: DKN1-UP; MCX1-UP); 349D2 MHPU (S/N: P271-UP); 349E MHPU (S/N: S3P1-UP)
OEM Excavator Based Specialty Solution: 352F OEM (S/N: B361-UP)

Reference: Disassembly and Assembly, "Sprocket - Remove and Install"

Reference: Disassembly and Assembly, "Final Drive - Disassemble"

Reference: Disassembly and Assembly, "Final Drive - Assemble"

Reference: Disassembly and Assembly, "Final Drive and Travel Motor- Remove and Install"

Reference: Disassembly and Assembly, "Duo-Cone Conventional Seals - Install"

Introduction

This special instruction provides a replacement procedure to replace the full open protected labyrinth (OPL) with a partial-OPL on the final drive housing. The new partial-OPL design of the final drives prevents mud packing which leads to final drive oil leaks at the duo-cone seals. The new partial-OPL final drive design should be used on hydraulic excavator that has had final drive oil leaks due to mud packing.

Do not perform any procedure in this Special Instruction until you have read the information and you understand the information.

Safety Section

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Do not attempt to assemble this machine until you read and you understand the assembly instructions.

Improper assembly procedures could result in injury or death.

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Personal injury or death can result from lifting a heavy component.
The heavy component can fall if using an incorrect hoist and/or sling or fastener to lift the load.

Be sure the hoist and other devices have the correct lifting capacity to lift a heavy component. The approximate weight of the heavy component is given below.

References

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Table 1
Sales Model	Publication Number
349D and 349D2	RENR9574
349E	KENR9848
349F and 352F	UENR0194

Required Parts

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Table 2
Required Parts
Item	Qty	Part Number	Part Name
1	1	452-3520	Motor Housing (RH)
2	1	452-3521	Motor Housing (LH)
3	2	255-2272	Duo-Cone Seal Gp
4	4	346-5556	Bearing Cone

Replacement Procedure

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Illustration 1	g06150999
OPL motor housing location (A) Full-OPL motor housing (B) Partial-OPL motor housing

Replace Full-OPL motor housing (A) with Partial-OPL motor housing (B). Refer to Table 1 for the appropriate Disassembly and Assembly.

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Illustration 2	g06151027
Partial-OPL housing slot - installation angle (1) Motor housing (RH) (2) Motor housing (LH) (C) Slot (RH) (D) Slot (LH)

When assembling the partial-OPL motor housing, replace Duo-Cone seal (3) and bearing cone (4). Ensure to install the bearing cone using the correct installation angle. Refer to Illustration 2.