- Track-Type Tractor:
- D8T (S/N: J8B1-UP; KPZ1-UP)
Introduction
This special instruction contains the procedure for reworking the pump body of the power train oil pump. A 3 mm (0.118 inch) drain hole has been added to the pump body in order to reduce pressure from behind the seal. This procedure will extend the service life of the lip seal for the pump and the drive shaft flange. The newly designed pump body is effective with machines D8T (S/N: J8B1323-1324,1330-1338,1344-UP; KPZ2508-UP).
Safety
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Do not attempt to disassemble or assemble this machine until you read and understand the disassembly and assembly instructions. Improper disassembly and assembly procedures could result in injury or death. |
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Accidental engine starting can cause injury or death to personnel working on the equipment. To avoid accidental engine starting, disconnect the battery cable from the negative (−) battery terminal. Completely tape all metal surfaces of the disconnected battery cable end in order to prevent contact with other metal surfaces which could activate the engine electrical system. Place a Do Not Operate tag at the Start/Stop switch location to inform personnel that the equipment is being worked on. |
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| NOTICE |
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Do not allow any dirt or foreign material to get into the power train system during assembly, connection of lines, when components are filled with fluid, or during any maintenance operation. |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
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Maintain the oil in the power train system at the correct level in order to prevent pump cavitation. |
Required Parts
| Required Parts | |||
|---|---|---|---|
| Item | Part Number | Description | Qty |
| 212-2301 | Flange | 1 | |
| 111-4919 | Lip Type Seal | 1 | |
| 6V-1179 | O-Ring Seal | 1 | |
| 118-8706 | O-Ring Seal | 3 | |
| 5P-8066 | O-Ring Seal | 1 | |
| 1U-8846 | Gasket Sealant | 1 | |
| 4 | 1U-8138 | Drill Bit | 1 |
| 5H-4279 | Cup Plug | 1 | |
| 4C-9506 | Retaining Compound | 1 | |
Rework Procedure
- Remove the 206-8703 Gear Pump Gp from the machine.
ReferenceRefer to Disassembly and Assembly, RENR7481, "Power Train Oil Pump - Remove" for the procedure on removing the power train oil pump.
- Disassemble the power train oil pump.
ReferenceRefer to Disassembly and Assembly, RENR7481, "Power Train Oil Pump - Disassemble" for the procedure on disassembling the power train oil pump.
- Remove 206-8681 Oil Pump Body As (1) from the pump.
Note: Pump body (1) can only be removed when the entire pump has been disassembled.
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| Illustration 1 | g01443397 |
- Put spot face (2) on both sides of pump body (1). Refer to dimension (A), dimension (B), dimension (D), and dimension (E) in Illustration 3 for the location of spot face (2) .
Note: Spot face (2) will ensure that a flat surface is available for drilling.
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| Illustration 2 | g01440350 |
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| Illustration 3 | g01440351 |
(2) 8 + 0.30 − 0.10 mm (0.315 + 0.012 − 0.004 inch) diameter for spot face (3) 3 + 0.25 − 0.10 mm (0.118 + 0.10 − .004 inch) hole diameter (A) 85 mm (3.3 inch) (B) 28 mm (1.1 inch) to the center line of the spot face (C) 30 mm (1.2 inch) to the center line of the hole (D) 24 mm (0.9 inch) (E) 9 mm (0.4 inch) | |
- Drill through hole (3) with drill bit (4). Refer to dimension (A) and dimension (C) in Illustration 3 for the location of through hole (3). If necessary, deburr through hole (3) and spot face (2) .
- Clean pump body (1) in order to avoid contamination of the power train system.
- Replace 212-2301 Flange , 111-4919 Lip Type Seal , and 6V-1179 O-Ring Seal . Apply 4C-9506 Retaining Compound to the 5H-4279 Cup Plug and the 212-2301 Flange . Then press the 5H-4279 Cup Plug into the 212-2301 Flange .
ReferenceRefer to Disassembly and Assembly, RENR7481, "Power Train Oil Pump - Assemble" for the procedure on installing these parts.
- Assemble the power train oil pump. If necessary, replace 5P-8066 O-Ring Seal , 118-8706 O-Ring Seal , and/or 1U-8846 Gasket Sealant .
ReferenceRefer to Disassembly and Assembly, RENR7481, "Power Train Oil Pump - Assemble" for the procedure on assembling the power train oil pump.
- Install the power train oil pump.
ReferenceRefer to Disassembly and Assembly, RENR7481, "Power Train Oil Pump - Install" for the procedure on installing the power train oil pump.
- Check the system pressures for the power train.
ReferenceRefer to Testing and Adjusting, RENR7526 for the various test for the power train system.