TK370 Wheel Feller Buncher, TK380 Wheel Feller Buncher, TK371 Industrial Tractor and TK381 Industrial Tractor Machine Systems Caterpillar

Note: The following procedure requires two people.

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Personal injury or death can result from escaping fluid under pressure. Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury. Always use a board or cardboard when checking for a leak.

1. Prepare the machine for troubleshooting.

   Reference: Refer toTesting and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.

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Illustration 1	g00865096
Typical Example (1) Implement pump. (2) Pressure tap (discharge pressure). (3) Pressure cutoff valve. (4) Pressure tap (load signal pressure).

2. Connect the 198-4240 Digital Pressure Indicator to pressure taps (2) and (4) .

3. Warm the hydraulic oil to normal operating temperature. Normal operating temperature is 45 °C (115 °F) to 70 °C (160 °F). Use the following procedure in order to warm the hydraulic oil.

   1. Operate the engine at 1800 RPM to 2000 RPM.

   2. Extend the lift arms until the cylinders bottom out.

   3. Operate the tilt cylinders back and forth until you reach the normal operating temperature.

4. Lower the work tool to the ground.

5. Increase the engine speed to 2350 ± 50 RPM.

6. Actuate any one of the following functions into a stall condition:
   • Lift cylinders

   • Tilt cylinders

   • Grapple arm cylinders

   • Collector arm cylinders

7. Record the readings from pressure taps (2) and (4). The pressure reading from both of the pressure taps should be approximately 26200 ± 175 kPa (3800 ± 25 psi).

8. If the recorded pressure for the high pressure cutoff is not correct, perform Steps 10 through 12.

9. If the recorded pressure of the high pressure cutoff is correct, perform Steps 14 through 16.

10. To adjust the high pressure cutoff setting, loosen the locknut on pressure cutoff valve (3) .

11. Actuate any one of the following functions into a stall condition:
    • Lift cylinders

    • Tilt cylinders

    • Grapple arm cylinders

    • Collector arm cylinders

12. Turn the adjustment screw on pressure cutoff valve (3) until the pressure reading from both of the pressure taps read approximately 26200 ± 175 kPa (3800 ± 25 psi).

13. Tighten the locknut on pressure cutoff valve (3). The high pressure cutoff is now set to the correct pressure.

14. Release the function that is in the stall condition.

15. Move the hydraulic lockout control to the LOCKED position.

16. Stop the engine. Remove the test equipment.