302.5C Mini Hydraulic Excavator Hydraulic System Caterpillar

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.

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".

Table 1

Required Tools
Description	Qty
Tape Measure	1
Stopwatch	1

Test Procedure for Boom, Stick, and Bucket Cylinders

Illustration 1	g00816216

1. Start the engine.

2. Position the machine on level ground.

3. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).

4. Load the bucket.

   Weight of bucket load ... 105 kg (231.5 lb)

5. Fully extend the bucket cylinder. Retract the bucket cylinder 10 mm (0.4 inch) from the fully extended state.

6. Fully retract the stick cylinder. Extend the stick cylinder 10 mm (0.4 inch) from the fully retracted state.

7. Raise or lower the boom until the bucket to stick pin is the same height as the boom foot pin. Refer to Illustration 1.

8. Measure each cylinder's length from cylinder pin to cylinder pin.

9. Stop the engine.

10. Leave the machine in this position for three minutes. Measure each cylinder's length from cylinder pin to cylinder pin for drift.

Table 2

Cylinder Drift
Item	Specification
Boom Cylinder	10 mm (0.39 inch) or less
Stick Cylinder
Bucket Cylinder	5 mm (0.2 inch) or less

Test Procedure for Blade Cylinder

Illustration 2	g00816222

1. Start the engine.

2. Position the machine on level ground.

3. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).

4. Position the stick so that the stick is perpendicular to the ground. Lower the stick to the ground. Refer to Illustration 2.

5. Fully retract the blade cylinder. Extend the blade cylinder 10 mm (0.4 inch) from the fully retracted state.

6. Measure the blade cylinder's length from cylinder pin to cylinder pin.

7. Stop the engine.

8. Leave the machine in this position for three minutes. Measure the blade cylinder's length from cylinder pin to cylinder pin for drift.

Table 3

Cylinder Drift
Item	Specification
Blade Cylinder	3 mm (0.12 inch) or less