325D Forest Machine Hydraulic System Caterpillar

Cylinder Speed - Check

Usage:

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Table 1
Cylinder Operating Speed (seconds)
Item		Specification
Boom	Extension	4.3 ± 0.7
Boom	Retraction	3.4 ± 0.7
Stick	Extension	5.4 ± 0.8
Stick	Retraction	4.4 ± 0.8
Heel	Extension	4.8 ± 0.6
Heel	Retraction	2.3 ± 0.6

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".

Perform the following steps with the engine set at high speed in order to test the operating speed of the boom cylinders.
1. Place the machine on level ground.
1. Position the grapple against the heel. Close the grapple.
1. Fully extend the heel cylinder.
1. Fully extend the stick cylinder.
1. Position the boom so that the heel is on the ground. With a stopwatch, measure the time that is required to extend the boom cylinders fully.
1. Position the boom cylinders at full extension. With a stopwatch, measure the time that is required for the heel to come in contact with the ground.
1. 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.
1. Place the machine on level ground.
1. Position the grapple against the heel. Close the grapple.
1. Fully retract the heel cylinder.
1. Fully retract the stick cylinder.
1. Position the boom cylinders so that the grapple is approximately 1 m (1.1 yd) above the ground.
1. With a stopwatch, measure the time that is required to extend the stick cylinder fully.
1. Extend the stick cylinder. With a stopwatch, measure the time that is required to retract the stick cylinder fully.
1. 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 heel cylinder.
1. Place the machine on level ground.
1. Position the grapple against the heel. Close the grapple.
1. Fully retract the stick cylinder.
1. Position the boom cylinders so that the heel is approximately 1 m (1.1 yd) above the ground during operation of the heel cylinder.
1. Fully retract the heel cylinder.
1. With a stopwatch, measure the time that is required to extend the heel cylinder fully.
1. Position the heel cylinder at full extension. With a stopwatch, measure the time that is required to retract the heel cylinder fully.
1. Refer to the specifications in Table 1 for the operating speed of the heel cylinder.