CONTROL GP-MACHINE 2277724 - Caterpillar

Table 2
Cylinder Operating Speed (seconds)    
Item    New    
Boom     Extension     3.7 0.3    
Retraction 3.9 0.3    
Stick     Extension     5.3 0.3    
Retraction 3.9 0.3    
Bucket     Extension     2.1 0.3    
Retraction 1.6 0.3    Boom Cylinders
Performance Test (Boom)
Perform the following steps in order to test the operating speed of the boom cylinders.
Illustration 1 g01226754
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 retract the bucket cylinder and fully retract the stick cylinder.
Position the boom cylinders at full extension. With a stopwatch, measure the time that is required for the bucket to come 2 m (6.6 ft) above the ground.
Refer to the specifications in Table 2 for the operating speed of the boom cylinders.Adjustment of the Boom Cylinders
Illustration 2 g01655493
(1) Slow return valve (2) Main control valve
Illustration 3 g01227077
(3) Slow return valve (6) 1P-2852 Spanner Wrench (7) 4C-4066 Wrench
In order to set the boom's slow return check valve, the "Performance Test (Boom)" must first be performed.
If the cycle time of the boom cylinders was not within the specification, position spanner wrench (6) at location (4) . Position wrench (7) at location (5) . Use wrench (7) in order to hold the slow return check valve stationary. Adjust the valve by rotating spanner wrench (6) . To increase the rate of travel, rotate spanner wrench (6) in a counterclockwise direction. In order to decrease the rate of travel, rotate the spanner wrench (6) in a clockwise direction.
Repeat the procedure for "Performance Test (Boom)" in order to verify the setting.Stick Cylinder
Performance Test (Stick)
Perform the following steps in order to test the operating speed of the stick cylinders.
Illustration 4 g01226873
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 retract the bucket cylinder and fully retract the stick cylinder.
Position the boom cylinders at full extension. With a stopwatch, measure the time that is required for the stick to fully extend the stick cylinder.
Refer to the specifications in Table 2 for the operating speed of the stick cylinders.Adjustment of the Stick Cylinder
Illustration 5 g01227191
(8) Slow return valve (9) Boom
Illustration 6 g01227077
(3) Slow return valve (6) 1P-2852 Spanner Wrench (7) 4C-4066 Wrench
In order to set the stick's slow return check valve, the "Performance Test (Stick)" must first be performed.
If the cycle time of the stick cylinder was not within the specification, position spanner wrench (6) at location (4) . Position wrench (7) at location (5) . Use wrench (7) in order to hold the slow return check valve stationary. Adjust the valve by rotating spanner wrench (6) . To increase the rate of travel, rotate spanner wrench (6) in a counterclockwise direction. In order to decrease the rate of travel, rotate the spanner wrench (6) in a clockwise direction.
Repeat the procedure for "Performance Test (Stick)" in order to verify the setting.