DIODE AS 5N4988 - 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, "Operational Checks" for the engine speed and 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, "Pressure Specifications".
Table 1
Required Tools    
Part Number    Description    Qty    
    Stopwatch     1    Preparation
Place the machine on level ground.Test (Boom Cylinders)
Fully extend the stick cylinder.Extension Test
Start with the end of the stick on the ground. Measure the time that is required for the boom cylinders to reach full extension.
Illustration 1 g00746709
(A) Extension test (B) Retraction testRetraction Test
Start with the boom cylinders at full extension. Measure the time that is required for the end of the stick to come in contact with the ground.Test (Stick Cylinder)
Position the upper surface of the boom parallel to the ground.Extension Test
Start with the stick cylinder in the full retracted position. The end of the stick should be approximately 1 m (3 ft 3 inch) from the ground. Measure the time that is required for full extension of the stick cylinder.
Illustration 2 g00746733
(A) Extension test (B) Retraction testRetraction Test
Start with the stick cylinder in the full extended position. Measure the time that is required to retract the stick cylinder.
Table 2
Cylinder Speed (seconds)    
Item    New    Rebuild    Service Limit    
Boom     Extension     4.1 0.5     5.3 max.     6.2 max.    
Retraction 3.0 0.5     3.9 max.     4.5 max.    
Stick     Extension     4.3 0.5     5.6 max.     6.5 max.    
Retraction 2.9 0.5     3.8 max.     4.4 max.