312F and 313F Excavator Machine Systems Cylinder Speed - Check - Blade (If Equipped) Caterpillar

Specifications

Introduction

The performance level of the blade cylinders and the hydraulic oil flow through the system to the implements can be determined by the following procedure.

Note: The engine speed and/or the machine configuration that is used during this test can affect the results of this test. Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for the engine speed that was used for this test. Refer to Testing and Adjusting, "Operational Checks" for the machine configurations that were used for this test.

Note: The relief valve pressure settings must be set to the relief valve pressure specification before performing this operational check. Refer to Testing and Adjusting, "Specifications".

Required Tools

Test Procedure

1. Perform the following steps to test the operating speed of the blade cylinder.

   1. Start the engine.

   2. Place the hydraulic activation control lever in the UNLOCKED position.

   3. Place the machine on level ground.

   4. Place the machine controls at the following settings: Engine speed dial "10" and AEC switch OFF.

   5. The bucket should be empty.
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      Illustration 1	g00727786
      (A) Extension test (B) Retraction test

   6. Position the upper surface of the boom parallel to the ground.

   7. Position the stick so that the stick is perpendicular to the ground.

   8. Fully extend the bucket cylinder.

   9. Fully retract the blade cylinder.

   10. With a stopwatch, measure the time that is required to extend the blade cylinder fully.

   11. Position the blade cylinder at full extension. With a stopwatch, measure the time that is required to retract the blade cylinder fully.

   12. Refer to the specifications in Table 1 for the operating speed of the blade cylinder.