Assembly and Installation of Inverted Duo-Cone Seals{7561} Caterpillar

Caterpillar Products: All

Introduction

This special instruction provides the procedure for assembling and installing inverted Duo-Cone Seals.

When the Duo-Cone Seals are installed and assembled, you must use the correct procedures. The Duo-Cone Seal may fail from one or more mistakes that are made during assembly or during installation of the seal components.

Reference: Special Instruction, SEHS8974, "Tool and Specification Chart for Inverted Duo-Cone Seals"

Correct Assembly of Inverted Duo-Cone Seals

Illustration 1	g00389812
(1) Shaft (2) Shaft seal ring (3) Rubber toric ring (4) Toric stabilizer (5) Shaft ramp (6) Seal ring retaining lip (7) Seal ring ramp (8) Seal ring face (9) Installation tool

Illustration 2	g00389813
(10) Retainer (11) Retainer seal ring (12) Rubber O-ring

Assembly and Installation Procedure

1. Remove all oil film, all dust or other foreign material from the following components:
   • Rubber toric ring (3)

   • Shaft ramp (5)

   • Seal ring ramp (7)

   • Seal ring retaining lip (6)

   Use isopropyl alcohol or other approved lubricants for assembly. Use a clean lint free cloth for wiping. All components should be completely dry prior to proceeding.

   Note: Never permit oil to contact the following components before the shaft seal ring and the retainer seal ring is assembled in the final position:

   • Rubber toric ring (3)

   • Shaft ramp (5)

   • Seal ring ramp (7)

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Illustration 3	g00389814

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Illustration 4	g00389815

2. Put rubber toric ring (3) on shaft seal ring (2). Make sure that the rubber toric ring is positioned at the bottom of seal ring ramp (7) and that the rubber toric ring is resting against retaining lip (6). The rubber toric ring must be straight in the shaft seal ring. The rubber toric ring must not be twisted.

   Note: Be careful when you are working on the rubber toric ring. Nicks, cuts, or scratches may cause leaks.

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Illustration 5	g00389816

3. Put toric stabilizer (4) on shaft (1) .

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Illustration 6	g00389817
Refer to ""Alternate Methods for Installation of the Shaft Seal Ring" " section in this publication for additional information. (A) Towels

4. Refer to Special Instruction, SEHS8974, "Tool and Specification Chart for Inverted Duo-Cone Seals" in order to select the proper installation tool. Hold installation tool (9) with shaft seal ring (2) and rubber toric ring (3) .

   Note: Lubricating the shaft seal ring for installation is not recommended. However, lubricant may be used. Refer to ""Alternate Methods for Installation of the Shaft Seal Ring" " section in this publication for additional information.

   Note: Do not use any liquid that leaves an oil film. Do not use any liquid that does not evaporate quickly.

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Illustration 7	g00389818

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Illustration 8	g00389819

Note: If lubricant for assembly is used, all surfaces of rubber toric ring (3) must remain wet during installation.

5. Use installation tool (9) to position shaft seal ring (2) and rubber toric ring (3) squarely on the shaft. See Illustration 7 and Illustration 8.

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Illustration 9	g00389820

6. Check assembled height (B) at four locations that are 90 degrees from each other. The difference in height around the ring must not exceed 0.8 mm (0.03 inch). Check assembled height (B) by using a caliper, a calibrated ruler or any other calibrated measuring device.

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Illustration 10	g00389821

7. Do not push on shaft seal ring (2) or pull on shaft seal ring (2) in order to make small adjustments. Use installation tool (9) in order to push down on the seal. Use your fingers to uniformly pull up rubber toric ring (3) and shaft seal ring (2) .

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Illustration 11	g00389822

8. Rubber toric ring (3) may twist if the ring is not completely wet. Rubber toric ring (3) may twist during installation if there are burrs or fins on shaft (1). Misalignments, twists, and bulges of the rubber toric ring will cause Duo-Cone Seal failures. If correct installation is not obvious, remove the seal from the shaft and repeat the installation procedure.

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Illustration 12	g00389823

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Illustration 13	g00389824

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Illustration 14	g00389825

9. Rubber toric ring (3) must never slip on the ramps of either shaft seal ring (2) or shaft (1). Allow an adequate amount of time for evaporation of the lubricant. Allow time for evaporation before proceeding with the procedure. This will prevent slippage. Once rubber toric ring (3) is correctly in place, the rubber toric ring must roll only on the ramps.

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Illustration 15	g00389826
Correct installation Refer to ""Results of Incorrect Assembly" " section in this publication for additional information.

10. Put O-ring (12) on seal ring (11) that is for the retainer.

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Illustration 16	g00389827

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Illustration 17	g00389828

11. Lubricate rubber O-ring (12) for easier assembly into retainer (10). Refer to ""Acceptable Lubricants for Assembling the Retainer Seal Ring" " section in this publication for additional information. Use installation tool (9) and a press in order to insert retainer seal ring (11) and rubber O-ring (12) into retainer (10). Insert retainer seal ring (11) until the ring rests against the bottom of the bore that is in retainer (10) .

    Note: Do not use too much lubricant. Make sure that the lubricant does not contact shaft ramp (5) or make contact with rubber toric ring (3) during assembly.

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Illustration 18	g00389829

12. Check assembled height (C) with a depth gauge at four locations that are 90 degrees from each other. The difference in height around the ring must not exceed 0.6 mm (0.02 inch).

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Illustration 19	g00389830

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Illustration 20	g00389831

13. Wipe seal ring face (8) of shaft seal ring (2) and wipe seal ring face (8) of retainer seal ring (11). Use a clean lint free cloth. No particles of any kind are permissible on the sealing surfaces. A small piece of paper from a paper towel can force apart the seal ring face, which will cause a leak.

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Illustration 21	g00389872

14. Apply a thin film of clean oil on the entire seal ring face of one or both seals. Use a lint free cloth or brush in order to distribute the oil evenly. Be careful not to get any oil on the rubber toric ring. Lubricate the seal faces by using the same oil that was used during assembly. Dye may have been used in the oil that was used during assembly. Use the same kind of oil without dye in order to lubricate the seal faces.

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Illustration 22	g00389873

15. Select correct alignment sleeve (14). Make sure that O-ring (15) is installed in retainer (10). Insert alignment sleeve (14) into the bores of retainer (10) and retainer seal ring (11). Slip the assembly over shaft (1). Carefully move and slowly move alignment sleeve (14), retainer (10) and seal ring (11) to the final position.

    Note: Do not force the retainer and the retainer seal ring together in a sudden manner. The seal component could be scratched or the seal component could be broken if the components are slammed together.

16. Tighten the bolts after the components are in the correct position.

17. Remove alignment sleeve (14) .

Alternate Methods for Installation of the Shaft Seal Ring

The shaft seal ring may be installed without a lubricant. Refer to Step 5 for the procedure to use the installation tool in order to position the shaft seal ring and the rubber toric ring squarely on the shaft. Refer to Step 6 for dry assembly of the rubber toric ring that is for the shaft. Dry assembly is approved for only the shaft seal.

The shaft seal ring may be installed by using isopropyl alcohol as a lubricant for assembly. If isopropyl alcohol is used, the following conditions must be met:

• All guidelines for safety and guidelines for disposal that are for flammable liquids must be followed.

• Use a lint free cloth in order to wipe the rubber toric ring with the proper lubricant. You may dip the rubber toric ring in a container that has towels that are saturated with the lubricant for assembly.

• Time for sufficient drying must be available. Isopropyl alcohol needs at least ten minutes in order to dry. Allow the isopropyl alcohol to dry prior to further assembly. You may need to decrease the time that is needed for drying the isopropyl alcohol if there is not enough available time. Use compressed air that is dry and filtered in order to dry the shaft seal ring. Do not use more than 69 kPa (10.0 psi) in order to blow dry the shaft seal area.

Note: Do not use any liquid that leaves an oil film. Do not use any liquid that does not evaporate quickly.

Acceptable Lubricants for Assembling the Retainer Seal Ring

Note: Do not use too much lubricant. Never permit the lubricant to contact shaft ramp (5) or rubber toric ring (3) during assembly.

The following liquids are acceptable lubricants for assembly:

• Isopropyl alcohol

• Water that contains 15 PPM rust preventive can be used. Use this water with a hydraulic press that is designed to install the retainer seal ring and the installation tool. A rate of travel that is 12.7 mm (.50 inch) per second with a maximum force of 1779 N (400 lb) is adequate to assemble the retainer seal ring. The seal face should be wiped so that the seal face is clean prior to further assembly. Use a lint free cloth to wipe the seal face.

• Quaker Solvo Clean 68-0 or PF

Note: The shaft seal or any other toric ring should not be cleaned with Quaker Solvo Clean 68-0 or PF.

Results of Incorrect Assembly

Illustration 23	g00389874
Incorrect assembly

The slipping of the rubber toric ring on the shaft ramp or on the seal ring ramp may result in uneven pressure on the seal face. Uneven pressure on the seal face causes galling, scoring and leakage.

Illustration 24	g00389875
Incorrect assembly

If the retainer seal ring is cocked during the assembly of the rubber toric ring, the rubber toric ring will be cocked. A rubber toric ring that is cocked will oscillate as the ring is rotated. Seals that are cocked may cause uneven pressure on the seal face. The uneven pressure on the seal face may cause galling, scoring and leakage. Seals that oscillate may allow dirt into the seal joint. This is caused by the pumping action that is created by the toric ring that is oscillating.

Illustration 25	g00389876
Incorrect assembly

Illustration 25 shows a toric ring that is assembled incorrectly. The shaft and the lower rubber toric ring is stationary. The retainer and the upper rubber toric ring are rotating. Note the positions of points (A), (B), (X) and (Y).

Illustration 26	g00389877
Incorrect assembly

Illustration 26 shows the same rubber toric ring after the retainer seal ring and the shaft seal ring have rotated 180 degrees. In this position, there will be high pressure at point (A) and at point (Y). These points of high pressure may result in galling of the shaft seal ring and the retainer seal ring. There will be low pressure at point (B) and at point (X) which will result in possible leakage.