305E CR and 305.5E CR Mini Hydraulic Excavators Hydraulic System Caterpillar

Cylinder Speed - Check

Usage:

Specification

Show/hide table

Table 1
Cylinder Operating Speed
Item		Specification
Item		305E CR	305.5E CR
Boom	Extension	2.6 ± 0.4 sec	2.8 ± 0.4 sec
Boom	Retraction	2.7 ± 0.4 sec	2.5 ± 0.4 sec
Stick	Extension	3.5 ± 0.4 sec	3.6 ± 0.4 sec
Stick	Retraction	2.6 ± 0.4 sec	2.9 ± 0.4 sec
Bucket	Extension	3.1 ± 0.4 sec	3.1 ± 0.4 sec
Bucket	Retraction	2.0 ± 0.4 sec	2.0 ± 0.4 sec
Blade	Extension	1.1 ± 0.2 sec	1.0 ± 0.2 sec
Blade	Retraction	1.0 ± 0.2 sec	1.0 ± 0.2 sec
Boom Swing (without stop)	Extension	5.8 ± 0.4 sec	6.3 ± 0.4 sec
Boom Swing (without stop)	Retraction	5.9 ± 0.4 sec	6.0 ± 0.4 sec

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

Show/hide table

Table 2
Required Tools
Description	Qty
Stopwatch	1

Test Procedure

Boom Cylinder

Show/hide table




Illustration 1	g02794310
(A) Extension test (B) Retraction test

Start the engine.
Place the machine on level ground.
Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
Empty the bucket.
Fully extend the bucket cylinder and fully retract the stick cylinder. Refer to Illustration 1.
Position the bucket on the ground. With a stopwatch, measure the time that is required to extend the boom cylinder to full extension.
Note: Do not include the time of the snubber operation of the boom cylinder.
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.

Stick Cylinder

Show/hide table




Illustration 2	g02797729
(A) Extension test (B) Retraction test

Start the engine.
Place the machine on level ground.
Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
Empty the bucket.
Position the upper surface of the boom parallel to the ground.
Fully extend the bucket cylinder. Refer to Illustration 2.
Fully retract the stick cylinder. With a stopwatch, measure the time that is required to extend the stick cylinder to full extension.
Fully extend the stick cylinder. With a stopwatch, measure the time that is required to retract the stick cylinder to full retraction.
Note: Do not include the time of the snubber operation of the stick cylinders.
Refer to the specifications in Table 1 for the operating speed of the stick cylinder.

Bucket Cylinder

Show/hide table




Illustration 3	g02797744
(A) Extension test (B) Retraction test

Start the engine.
Place the machine on level ground.
Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
Empty the bucket.
Position the upper surface of the boom parallel to the ground.
Position the stick so that the stick is perpendicular to the ground. Refer to Illustration 3.
Fully retract the bucket cylinder. With a stopwatch, measure the time that is required to extend the bucket cylinder to full extension.
Fully extend the bucket cylinder. With a stopwatch, measure the time that is required to retract the bucket cylinder to full retraction.
Refer to the specifications in Table 1 for the operating speed of the bucket cylinder.

Blade Cylinder

Show/hide table




Illustration 4	g02797773
(A) Extension test (B) Retraction test

Start the engine.
Place the machine on level ground.
Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
Position the stick so that the stick is perpendicular to the ground.
Lower the stick to the ground. Refer to Illustration 4.
Fully retract the blade cylinder. With a stopwatch, measure the time that is required to lower the blade to the ground.
Position the blade on the ground. With a stopwatch, measure the time that is required to retract the blade cylinder to full retraction.
Refer to the specifications in Table 1 for the operating speed of the blade cylinder.

Boom Swing Cylinder

Show/hide table




Illustration 5	g02797228
Top View (A) Retraction test (B) Extension test

Start the engine.
Place the machine on level ground.
Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
Position the stick so that the stick is perpendicular to the ground.
Fully retract the boom swing cylinder. With a stopwatch, measure the time that is required to extend the boom swing cylinder to full extension.
Position the boom swing against the swing stop. With a stopwatch, measure the time that is required to retract the boom swing cylinder to full retraction.
Refer to the specifications in Table 1 for the operating speed of the boom swing cylinder.