Inspection of the Rear of the Engine on Certain C4.4 Machines {1201} Caterpillar

Asphalt Compactor

CB64B (S/N: 4771-UP)

CB66B (S/N: 4751-UP)

CB68B (S/N: 4961-UP)

Asphalt Paver

AP500F (S/N: 5031-UP; AF51-UP)

AP555F (S/N: 5F51-UP; RBM1-UP)

Backhoe Loader

420E (S/N: PRA1-UP; PHC1-UP; GEK1-UP; DJL1-UP; DAN1-UP)

430E (S/N: SWC1-UP; SCD1-UP; RLN1-UP)

450E (S/N: RBA1-UP; EBL1-UP)

Electric Power Generation

C4.4 DE88E3/DE1 (S/N: ECK1-UP)

C4.4 GEN SET (S/N: TX21-UP; CN41-UP; LC41-UP; LC51-UP; CN61-UP; D4B1-UP; D4D1-UP; GLD1-UP; MZT1-UP)

Engine

C4.4 (S/N: TXB1-UP; L4R1-UP; L4T1-UP)

Excavator

318D2 (S/N: AB71-UP; SGB1-UP; JHE1-UP; HBP1-UP; M8P1-UP; M8R1-UP)

320 GC (S/N: BR41-UP; DKJ1-UP; ZBT1-UP)

320D2 (S/N: EG11-UP; PFE1-UP; NBH1-UP; ZBH1-UP; YBJ1-UP)

Generator Set

XQP100 (S/N: PRD1-UP)

Paving Compactor

CB10 (S/N: MS21-UP)

CB7 (S/N: AT51-UP)

Pneumatic Compactor

CW12 (S/N: RHJ1-UP)

CW16 (S/N: N6J1-UP)

CW34 (S/N: 3G41-UP; B7L1-UP)

Telehandler

TH357D (S/N: TD71-UP)

TH408D (S/N: TH41-UP)

TL1055D (S/N: MNT1-UP)

TL1255D (S/N: MYW1-UP)

TL642D (S/N: MLG1-UP)

TL943D (S/N: MLD1-UP)

Track-Type Tractor

D3K2 (S/N: FT31-UP; LT31-UP)

D4K2 (S/N: MT31-UP; RT31-UP)

D5K2 (S/N: WT31-UP; YT31-UP)

D6N (S/N: LJR1-UP)

Vibratory Asphalt Compactor

CB13 (S/N: LP91-UP)

CB15 (S/N: NPB1-UP)

Vibratory Soil Compactor

CP44B (S/N: GTT1-UP)

CP54B (S/N: GP51-UP; PM51-UP; P5F1-UP)

CS44B (S/N: RGE1-UP)

CS54B (S/N: G541-UP; 5M41-UP; M5B1-UP; MFC1-UP)

CS64B (S/N: DH61-UP; TF61-UP)

Wheeled Excavator

M315D2 (S/N: CA41-UP)

M317D2 (S/N: CA61-UP)

M320D2 (S/N: CH91-UP)

Introduction

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

Use this procedure to identify the source of any leaks observed around the Rear End Oil Seal (REOS).

Safety Section

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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.

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Failure to follow all safety guidelines prescribed in this document and by governing authorities and regulatory agencies may result in severe injury or death of personnel or machine damage.

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When removing a major component or attachment, ensure that it is properly blocked or secured before removing mounting hardware. An assembly that is disconnected without proper blocking may shift or fall, resulting in serious injury or death of personnel or machine damage.

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Personal injury or death can result from improper maintenance procedures. To avoid injury or death, follow the procedures exactly as stated below.

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Personal injury can result from improper handling of chemicals. Make sure you use all the necessary protective equipment required to do the job. Make sure that you read and understand all directions and hazards described on the labels and material safety data sheet of any chemical that is used. Observe all safety precautions recommended by the chemical manufacturer for handling, storage, and disposal of chemicals.

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Climbing equipment may be required to access this service point. Refer to the Operation and Maintenance Manual, "Mounting and Dismounting" topic for safety information.

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Before servicing/performing maintenance on the machine, electrical power must be physically disconnected; battery plugs must be disconnected from the batteries, or the trailing cable must be unplugged, and warning tags and padlocks shall be applied by a certified electrician. Certified electricians shall perform or direct any electrical work, including any energized testing, repair work in controllers, motors, or other approved compartments, and shall insure that all compartments are properly closed and inspected prior to re-energization. All applicable lock out and tag out procedures must be followed.

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Do not operate the machine if any guards or covers are missing or inadequately secured. Personnel could be seriously injured or machine damage may occur.

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Observe the safe working load limits of all lifting and blocking devices and keep a safe distance from suspended/blocked loads. Personnel may be seriously injured or killed by falling loads.

Procedure

If a leak is suspected from the Rear End Oil Seal 232-7449, refer to this document to provide additional guidance in correctly identifying a leak from the Rear End Oil Seal.

Illustration 1	g06415510
Typical example

Illustration 2	g06415556
Typical example

Rear end oil leaks may originate from many different sources such as the following :

• Rear End Oil Seal (1)

• Oil rail plug (2)

• Camshaft plug (3)

• Dust seal (4)

• Bridge piece (5)

• Sump gasket joint (6)

Illustration 3	g06017560
Typical example

The leak may also be a water or coolant. Staining from engine preservative may also give the appearance of a leak. Refer to illustration 3

Perform the following procedure to troubleshoot the leak.

1. Clean the area of the engine affected by the leaking fluid.

2. Add an Ultraviolet (UV) fluorescent dye to the engine oil. Follow the dilution instructions provided by the manufacturer of the dye. Too much dye can cause permanent staining of the surfaces.

3. Operate the engine until the suspected leak appears again. Stop the engine.

4. Using UV light, and in dark ambient conditions, inspect the area of the leak. Confirm the nature of the leak.

   Note: UV sensitive dye will have a high intensity fluorescence. Some low intensity natural fluorescence may be visible for other fluids.

5. If the leak is visible but does not show high intensity fluorescence, investigate the source of the leak as the leak is not engine oil.

If the leak is identified as engine oil, perform the following procedure to identify the origin of the leak:

1. Perform a visual inspection of the REOS area.
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   Illustration 4	g06017610

2. Use the UV light to identify the leak location (see Illustration 4):

   • (A) Between the rotary seal and the crankshaft or between the rotary seal and the seal housing

   • (B) Through the bolt holes

   • (C) Between the static seal and the mating component

   Note: The REOS is a dynamic seal and a level of oil will present between the REOS's PTFE lip seal and the crank-palm.
   

3. Remove the REOS and inspect the crank palm. Look for any of the following:

   • Poor surface finish

   • Machining lead

   • Pitting

   • Scratches

   • Corrosion

   • Discoloration

   • Oil deposits

   • Excessive wear

   • Paint

   • Damage
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   Illustration 5	g06415613

4. Inspect REOS primary seal (7) for the following faults:

   • Uneven wear

   • Excessive wear

   • Deposits in the ridges of the seal

   • Scratches

   • Damage

   • Spring retention of the seal

   • Contamination

5. Check that the bridge piece is fitted correctly and that sealant is present.

6. Install a new 232-7449 Housing Assembly. Refer to Disassembly and Assembly, Crankshaft Rear Seal - Install for the correct procedure.