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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
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Note: Make sure that you read Systems Operation/Testing and Adjusting, "General Testing and Adjusting Information" before you perform the following procedure.
Shimming the Front Axle
Note: You will need a 1U-8865 Infrared Thermometer in order to complete the procedure for shimming.
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| Illustration 1 | g00566994 |
Front Axle (1) Shims (2) Idler wheel sidewall on the inboard side of the idler wheel (3) Idler wheel sidewall on the outboard side of the idler wheel | |
The rubber will scuff as the belts "break in " to the driver and idlers in the following conditions: very wet conditions and dry, clean conditions that are not dusty. The "break-in" scuffing of the belts can last up to 400 hours. The condition of the guide blocks may appear to have moderate wear to severe wear on the surface. Some material may be removed. Although scuffing affects the appearance of the material early, the overall life of the guide block should not be affected. No action should be needed unless scuffing of the guide blocks is associated with high temperatures of the guide block. The surface of the guide block will eventually be "healed over" and the edges will be rounded in the damaged area.
Note: A quick check of the belt alignment can be accomplished by driving the machine straight ahead without steering. The machine should be in sixth gear. Allow the machine to coast to a stop. Do not touch the steering wheel. Visually examine the location of the guide blocks relative to the idler wheel. This can give you a good estimate of the belt alignment. If the guide blocks are centered between the inner idler wheel and the outer idler wheel, alignment is good. If hard contact occurs between the guide blocks and the inner idler, alignment of the belt may be necessary. If hard contact occurs between the guide blocks and the outer idler, alignment of the belt may be necessary. You may want to check belt alignment in this manner before you run the temperature test. This will allow a good estimate in the future without running the temperature test.
If the scuffing of the guide blocks continues past 400 hours or the scuffing is associated with high temperatures, the belts may be misaligned.
Note: The machine should not be operated for at least 5 hours prior to the temperature measurement. Residual heat on the rubber surfaces could give erroneous temperature readings.
- Drive the machine on a paved, level surface. Drive the machine at maximum speed for a time period between 15 to 18 minutes. Make as few turns as possible.
Note: The undercarriage must be dry for proper results.
- As quickly as possible, record the maximum temperature of idler wheel sidewall (2) and idler wheel sidewall (3) on both sides of the machine. See Illustration 1 for the correct location for taking the temperatures.
Scan the rubber sidewalls that are part of the portion of the idler wheel that is not obscured by the belt. Use a 1U-8865 Infrared Thermometer. It is not necessary to scan the entire circumference of the idler wheel in order to find the maximum temperature.
Note: The temperatures should be measured within 2 minutes after the machine is stopped.
- See Tables 1 or 2 for the requirements for shimming. Use these tables if the temperature difference between idler wheel sidewall (2) and idler wheel sidewall (3) is 11.1 °C (20 °F) or more.
If the temperature difference between idler wheel sidewall (2) and idler wheel sidewall (3) is less than 11.1 °C (20 °F), there should not be a problem with aligning the belt. Operation of the machine may continue with regular observation of the guide blocks.
Note: See Tables 1 or 2 in order to use the correct information to change the angle.
Tables 1 or 2 should be used as a general guideline. The information in the tables should not be considered as a perfect measurement. The requirements for shimming vary depending on the manufacturing tolerances.
Show/hide tableTable 1 Left Side of Machine Outer Idler (1) Inner Idler (2) Temperature Difference Increase of Angle Temperature Difference Decrease of Angle
11.1 °C (20 °F)0.08 degrees
11.1 °C (20 °F)0.08 degrees
22.1 °C (40 °F)0.17 degrees
22.1 °C (40 °F)0.17 degrees
33.3 °C (60 °F)0.25 degrees
33.3 °C (60 °F)0.25 degrees
44.5 °C (80 °F)0.31 degrees
44.5 °C (80 °F)0.31 degrees
55.6 °C (100 °F)0.36 degrees
55.6 °C (100 °F)0.36 degrees
66.7 °C (120 °F)0.41 degrees
66.7 °C (120 °F)0.41 degrees
77.8 °C (140 °F)0.45 degrees
77.8 °C (140 °F)0.45 degrees Show/hide table( 1 ) Record the hottest temperature. ( 2 ) Record the hottest temperature. Show/hide tableTable 2 Right Side of Machine Outer Idler (1) Inner Idler (2) Temperature Difference Increase of Angle Temperature Difference Decrease of Angle
11.1 °C (20 °F)0.12 degrees
11.1 °C (20 °F)0.08 degrees
22.1 °C (40 °F)0.23 degrees
22.1 °C (40 °F)0.17 degrees
33.3 °C (60 °F)0.33 degrees
33.3 °C (60 °F)0.25 degrees
44.5 °C (80 °F)0.44 degrees
44.5 °C (80 °F)0.31 degrees
55.6 °C (100 °F)0.54 degrees
55.6 °C (100 °F)0.36 degrees
66.7 °C (120 °F)0.63 degrees
66.7 °C (120 °F)0.41 degrees
77.8 °C (140 °F)0.73 degrees
77.8 °C (140 °F)0.45 degrees Show/hide table( 1 ) Record the hottest temperature. ( 2 ) Record the hottest temperature.
- Determine the previous shim angle by removing the existing shim and by determining the shim angle. Use Table 3.
Show/hide table
Table 3 Shims for Challenger 65E, Challenger 75E, Challenger 85E, and Challenger 95E Agricultural Tractors Part Number Angle (1) 110-6352 .200 degrees 110-6353 .300 degrees 110-6354 .400 degrees 110-6355 .500 degrees 110-6356 .600 degrees 110-6357 .700 degrees 110-6358 .800 degrees 112-3761 .900 degrees Show/hide table( 1 ) Never stack more than two shims.
- When shims are required, the new shim angle can be determined by the following formula:
"New angle = Previous shim angle +/- Angle from Table 1 or Table 2."
Use one or two shims that are listed in Table 3. Increase or decrease the total shim angle by the amount that is indicated in Tables 1 or 2.
The guide blocks may have the following conditions:
- The machine has scuffing to the outside of the guide block on the right belt.
- The temperature differential is 33.3 °C (60 °F).
- The machine is equipped with a 110-6356 Shim (.600 degree) as standard equipment.
The solutions to the conditions that are mentioned above are the following adjustments:
- If the highest temperature is recorded on the belt on the right side of the machine and the idler wheel sidewall (3), the shim angle should be increased by approximately .33 degrees. See Table 2.
- The machine is equipped with a 110-6356 Shim (.600 degree). The total new angle should be .900 degrees.
The new angle (.900 degree) can be acquired by completing either of the following steps: