308D CR 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. 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".

Table 1

Required Tools
Description	Qty
Measuring Tape	1
Stopwatch	1

Illustration 1	g00727765

1. Position the machine on level ground. Refer to Illustration 1.

2. Empty the bucket.

3. Raise the boom high enough so that the stick can be positioned perpendicular to the ground.

4. Fully extend the bucket cylinder.

5. Fully retract the blade cylinder.

6. Measure the length of the blade cylinder from cylinder pin to cylinder pin.

7. Stop the engine.

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

Table 2

Cylinder Drift (Blade)
Item	New	Rebuild	Service Limit
Blade Cylinder	7.0 mm (0.28 inch) or less	10.5 mm (0.41 inch) or less	17.5 mm (0.69 inch) or less