Cylinder Speed - Check
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" 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".
- Perform the following steps in order to test the operating speed of the boom cylinders.
- Place the machine on level ground.
Show/hide tableIllustration 1 g00298498
(A) Extension test
(B) Retraction test
- The bucket should be empty.
- Fully retract the bucket cylinder and the stick cylinder.
- Position the bucket on the ground. With a stopwatch, measure the time that is required to fully extend the boom cylinders.
- Position the boom cylinders at full extension. With a stopwatch, measure the time that is required for the bucket to come in contact with the ground.
- Refer to the specifications in Table 1 for the operating speed of the boom cylinders.
- Perform the following steps in order to test the operating speed of the stick cylinder.
- Place the machine on level ground.
Show/hide tableIllustration 2 g00298558
(A) Extension test
(B) Retraction test
- The bucket should be empty.
- Position the upper surface of the boom parallel to the ground.
- Fully extend the bucket cylinder.
- Retract the stick cylinder. With a stopwatch, measure the time that is required to fully extend the stick cylinder.
- Extend the stick cylinder. With a stopwatch, measure the time that is required to fully retract the stick cylinder.
- Refer to the specifications in Table 1 for the operating speed of the stick cylinder.
- Perform the following steps in order to test the operating speed of the bucket cylinder.
- Place the machine on level ground.
Show/hide tableIllustration 3 g00298598
(A) Extension test
(B) Retraction test
- The bucket should be empty.
- Position the upper surface of the boom parallel to the ground.
- Position the stick so that the stick is perpendicular to the ground.
- Fully retract the bucket cylinder.
- With a stopwatch, measure the time that is required to fully extend the bucket cylinder.
- Position the bucket cylinder at full extension. With a stopwatch, measure the time that is required to fully retract the bucket cylinder.
- Refer to the specifications in Table 1 for the operating speed of the bucket cylinder.
Show/hide table
Cylinder Operating Speed (seconds)     | ||||
---|---|---|---|---|
Item     | New     | Rebuild     | Service Limit     | |
Boom     | Extension     | 3.5 ± 0.5     | 4.0 (1)     | 4.6 (1)     |
Retraction | 2.7 ± 0.5     | 3.1 (1)     | 3.5 (1)     | |
Stick     | Extension     | 3.2 ± 0.5     | 3.7 (1)     | 4.2 (1)     |
Retraction | 2.4 ± 0.5     | 2.6 (1)     | 3.0 (1)     | |
Bucket     | Extension     | 3.3 ± 0.5     | 3.8 (1)     | 4.3 (1)     |
Retraction | 1.8 ± 0.5     | 2.1 (1)     | 2.3 (1)     |
Show/hide table
( 1 ) | Maximum |
Caterpillar Information System:
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