This article introduces Caterpillar 311D LRR EXCAVATOR CLA Duo-Cone Universal Floating Seal – Installation
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Assembly and installation procedures
warn!
Avoid prolonged skin contact with isopropyl alcohol. Try to avoid breathing air in confined spaces and do not smoke. Isopropyl alcohol is flammable. Do not use near open flames, welding operations, or around heated surfaces exceeding 482°C (900°F).
- Remove any oil film, dust or other foreign matter from the following components:
◦ Rubber toric ring (2)
◦ Housing ramp (4)
◦ Seal bevel (7)
◦ Housing retaining lip (3)
◦ Seal retaining lip (8)
◦ Seal housing (5)
NOTE:
The seal has very sharp edges. Avoid injury by wearing protective gloves. Use the cleaner in Tooling (B) or isopropyl alcohol or other approved cleaner. Wipe with a clean, lint-free cloth. All parts should be completely dry before continuing work.
NOTE: Be careful not to allow oil to contact the rubber toric ring (2), housing ramp (4), or seal ramp (7) until both seals (1) are assembled in their final position.
- Place the rubber toric ring (2) onto the seal (1). Make sure the rubber toric ring is at the bottom of the seal bevel (7). The rubber toric ring must seat onto the retaining lip (8). The rubber toric ring must be straight inside the seal.
The toric ring must not be twisted. NOTE: Use caution when handling the rubber toric ring. Nicks, cuts, and abrasions can cause leaks. 3. Refer to Special Instructions, SEHS8484, “Tooling and Technical Data Sheets for Universal DuoCone Seals” to select the correct installation tool.
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- Install the rubber toric ring (2) onto the seal (1) using the installation tool (9). Lightly lubricate the lower portion of the rubber toric ring (2) with a suitable lubricant. Refer to “Acceptable assembly lubricants” in this document for more information. Lubricate the rubber toric ring using the following steps: ◦ Wipe the seal with a lint-free cloth. ◦ Place a foam towel or pad in the bottom of a container. Saturate the towel or pad with lubricant. Immerse the rubber toric ring in the container. Note: Check the installation tool regularly for damage. Replace the installation tool if necessary.
- Ensure that the lower part of the rubber toric ring (2) is still wet. Using the installation tool (9), press the seal (1) and rubber toric ring (2) straight against the seal housing (5). When pressing down on the smaller diameter toric ring, ensure that you apply sudden and even pressure. Press the rubber toric ring (2) under the housing retaining lip (3) that is part of the seal housing (5). Install the larger diameter rubber toric ring using the following steps: ◦ Push the rubber toric ring over the seal retaining lip on one side. ◦ Use a rubber hammer to tap the installation tool on the opposite side of the rubber toric ring. Keep tapping until the rubber toric ring slides over the housing seal retaining lip.
Figure 6 Tools (A) (B) Assembly height (10) Dial gauge (11) Collet assembly (12) Dial gauge holder (plastic) (13) Contact
- Use Tool (A) to check the assembly height (B) at four locations at 90 degrees. The height difference must not exceed 1.0 mm (0.04 in). Refer to Figure 6.
- Never adjust the seal (1) by pushing or pulling it. Use the installation tool (9) to press down the seal.
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8 if the seal is not fully wetted or if the housing retaining lip (3) that is part of the seal housing (5) has burrs or fins, the rubber toric ring (2) may have twisted during installation. Misalignment, twisting, and bulging of the rubber toric ring will result in damage to the DuoCone seal. If improper installation is suspected, remove the toric ring from the housing and repeat the installation procedure.
- Use a lint-free cloth to wipe the seal face (6) that is part of the seal (1). No particles should remain on the sealing surface. A small piece of paper towel can separate the seal face and cause leakage. NOTE: The rubber toric ring (2) must not slip on the bevel of the seal (1) or the bevel of the seal housing (5). To prevent slipping, allow sufficient time for the lubricant to evaporate before continuing the procedure. Once the rubber toric ring is properly positioned, it can only roll on the bevel.
