TRUNNION 9U4681 - Caterpillar

Specification
Table 1
Cylinder Operating Speed
Item Specification
Boom Extension 3.3 0.4 sec
Retraction 3.6 0.4 sec
Stick Extension 2.9 0.4 sec
Retraction 2.2 0.4 sec
Bucket Extension 2.5 0.4 sec
Retraction 1.8 0.4 sec
Blade Extension 1.2 0.4 sec
Retraction 1.2 0.4 sec Introduction
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
Table 2
Required Tools
Description Qty
Stopwatch 1 Test Procedure
Boom Cylinder
Illustration 1 g03332678
(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 cylinder. Stick Cylinder
Illustration 2 g03332662
(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
Illustration 3 g03332639
(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