320D RR Excavator and 320D RR Forest Machine 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	g00298378

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

2. Load the bucket.

   Weight of bucket load

   320D RR ... 1050 kg (2310 lb)

   320D LRR ... 1200 kg (2640 lb)

3. Raise the boom until the top stick pin is the same height as the boom foot pin.

4. Fully extend the bucket cylinder.

5. Fully retract the stick cylinder.

6. Extend the stick cylinder rod 70 mm (2.8 inch) from the fully retracted position.

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

8. Stop the engine.

9. 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 (Loaded Bucket)
Item	New	Rebuild	Service Limit
Boom Cylinder	6.0 mm (0.24 inch) or less	12.0 mm (0.47 inch) or less	24.0 mm (0.95 inch) or less
Stick Cylinder	12.0 mm (0.47 inch) or less	18.0 mm (0.71 inch) or less	30.0 mm (1.18 inch) or less
Bucket Cylinder	18.0 mm (0.71 inch) or less	27.0 mm (1.06 inch) or less	45.0 mm (1.77 inch) or less