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Best Practices for Fluid Fill and Auditing Transmissions




I.Overview of fluid filling/leveling methods and their downfalls


II.Overview of the Wilkris fluid filling/leveling method.


III.Overview of why the Wilkris fluid filling method is more cost efficient, and faster and more accurate than current methods.


I. Common Fluid Filling Methods

There are four methods historically used to fill.

1. The vacuum Straw/vacuum stand pipe method.
2. The volumetric method.
3. The weight method.

The specification to verify these methods is by measuring the oil level. This is accomplished through the use of a sight gauge or a dip stick.


1. The Vacuum Straw/Stand Pipe method

There are five common reasons the tiny port on the level sensing straw is covered and the fill cycle is stopped:

A. Because the correct level has been reached.
B. Because foam has covered the hole.
C. Because splash has covered the hole.
D. Because turbulence has covered the hole.
E. Because temperature has expanded the oil and it now covers the hole.

The vacuum straw can measure only to one level, the vacuum port on the straw. This limits multiple levels to be set, and limits the number of items that can be filled by one set of tooling.


2. The Weight Method

The weight method weighs the transmission in order to verify the volume of oil. This system is very expensive to implement and maintain because it requires tracking the weight of each component of the transmission being filled, pallet, and in process dunnage. Once a transmission is filled it is extremely difficult to re-fill because of the residual oil contained in a re-operated item. In addition; The weight does not have a direct correlation to the level of oil.


3. The Volumetric Method

The volumetric method uses a known volume of oil and fills the transmission with oil. Volumetric fill is not reliable, the internal cavity and oil pan of transmissions can vary and affect the oil level considerably. Again; The volume of oil does not have a direct correlation to the level of oil in the transmission.


II. The Wilkris Method

The following are a few advantages of the Wilkris Method:

1. The Wilkris method is immune to turbulence, splash, and foam.

2. Level can be set to any set point. Different part or product types can be filled by the same system to the required level.

3. Fast response time. The Wilkris method fills to a predetermined level and then stops. Filling can be stopped at any level within the sensing range of the gauge, +/-1 mm. This can be demonstrated. There is no need to overfill and then bring down the level.

4. Temperature Compensation, expanding hot oil can be normalized to any temperature.

5. Easy to use, the Wilkris Method works like a digital dipstick.

6. Labor is reduced, the Wilkris method can be completely automated.

7. Reworks are reduced due to the precision level signal.

8. Material usage is reduced because there are no overfills with the Wilkris method.

9. Rejections are reduced, the method is accurate to +/-1 mm.

10. The method produces data that can be viewed and compared.

11. The Wilkris method makes filling more cost efficient.


III. Summary

1. The specification to verify the correct oil content is by measuring the oil level.

2. The volumetric method does not measure level.

3. The weight method does not measure level.

4. The Standpipe method is rigid and unreliable.

5. The dipstick method is subjective and prone to operator error.

6. The Wilkris method measures oil level accurately to +/-1 mm.

7. Wilkris fill systems are flexible, they can fill to multiple levels.

8. Wilkris fill systems are reliable, the calibration holds for months.

9. Wilkris fill systems are robust, they perform and last in rough manufacturing environments.

10. Wilkris fill systems can be fully automated.




Page last modified 19 January 2005