Hydraulic System Checks
Listen for noise from the hydraulic pumps.
Swing and Travel Parking Brake Checks
The operational checks can be used to find leakage in the system. The checks can also be used to find a valve or a pump that is not functioning correctly.
Swing Parking Brake
- Install a tee, a test port, and a pressure gauge in the hydraulic line for the swing parking brake release. Install a pressure gauge in the swing pilot circuit.
- Gradually increase the swing pilot pressure. The swing parking brake should release and the pressure gauge should read at least 3000 kPa (435 psi) before the pilot pressure in the swing system reaches 600 kPa (87 psi).
- After the swing function is stopped, the pressure to the swing parking brakes should drop below 600 kPa (87 psi) within 8 seconds. This verifies that the swing parking brake is applied.
Travel Parking Brake
- Install a tee, a test port, and a pressure gauge in the hydraulic line for the travel parking brake release. Install a pressure gauge in the travel pilot circuit.
- Gradually increase the pilot pressure in the travel system. The travel parking brake should release and the pressure gauge should read at least 3000 kPa (435 psi) before the pilot pressure in the travel system reaches 600 kPa (87 psi).
- After the travel function is stopped, the pressure to the swing parking brakes should drop below 600 kPa (87 psi) within 8 seconds. This verifies that the travel parking brake is applied.
Implement and Swing Cycle Times
The speed of the cylinder rod movement can be used to check the condition of the cylinders and the pumps.
Note: If several of the cycle times are less than the times specified, the pump margin pressure settings or the pump destroking pressure settings may need adjustment.
Note: Cycle time is defined as the time between the starting and the stopping of implement movement.
Engine Settings
- High idle ... 1810 ± 20 rpm
- Oil temperature ... 40° to 60°C (104° to 140°F)
Extension of Boom Cylinder
The following time is required to lift the boom from the ground level to the maximum height with the stick and the bucket cylinders extended. Start with the bucket on the ground.
- Mass Excavator ... 7.4 ± 1.0 sec
- Front Shovel ... 5.1 ± 1.0 sec
Retraction of Boom Cylinder
The following time is required to lower the boom from the maximum height to the ground level. Start with the bucket at the maximum height.
- Mass Excavator ... 7.2 sec maximum
- Front Shovel ... 5.5 sec maximum
Extension of Stick Cylinder
The following time is required for full extension of the stick cylinders. Start with the boom up and the bucket in the curled position.
- Mass Excavator ... 7.4 ± 1.0 sec
- Front Shovel ... 5.2 ± 1.0 sec
Retraction of Stick Cylinder
The following time is required for the full retraction of the stick cylinders. Start with the boom up and the bucket in the curled position.
- Mass Excavator ... 4.3 ± 1.0 sec
- Front Shovel ... 3.4 ± 1.0 sec
Extension of Bucket Cylinder (load)
The following time is required for full extension of the bucket cylinders.
- Mass Excavator ... 5.4 ± 1.0 sec
- Front Shovel ... 5.1 ± 1.0 sec
Retraction of Bucket Cylinder (dump)
The following time is required for the full retraction of the bucket cylinders.
- Mass Excavator ... 2.4 ± 1.0 sec
- Front Shovel ... 2.2 ± 1.0 sec
Extension of Bottom Dump Cylinder (close bucket)
The following time is required for full extension of the bottom dump cylinders. ... 2.5 ± 1.0 sec
Retraction of Bottom Dump Cylinder (open bucket)
The following time is required for the full retraction of the bottom dump cylinders. ... 1.9 ± 1.0 sec
Swing
The following time is required to swing the upper structure for 3 full revolutions. Start with the upper structure in motion. ... 41 to 53 sec
Travel Time and Steering Drift
Operate the machine in the forward direction and the reverse direction. Check if the machine veers to the right or to the left in either direction.
The following time is required for the machine to travel 100 m (328 ft) from a moving start. The time is valid for travel in a forward or backward direction. ... 95 to 129 sec
The maximum drift in 100 m (328 ft) must not exceed 8 m (26 ft).
Times for Implement Drift for Boom, Stick and Bucket
Note: The following values are for the maximum allowable drift with the oil temperature at 38°C (100°F).
Boom in Raised Position
Start with the stick and boom cylinders at full extension. The allowable drift is 50 mm (1.97 inch) in 5 minutes.
Stick OUT
Start with the stick cylinders in the fully extended position for the front shovel. Start with the stick cylinders in the fully retracted position for the mass excavator. The following values are the maximum allowable drift in 5 minutes.
- Mass Excavator ... 60 mm (2.4 inch)
- Front Shovel ... 40 mm (1.57 inch)
Bucket in CURLED Position
Start with the bucket cylinders at full extension. The following values are the maximum allowable drift in 5 minutes.
- Mass Excavator ... 50 mm (1.97 inch)
- Front Shovel ... 40 mm (1.57 inch)
Times for Implement Drift at Other Oil Temperatures
Note: The minimum allowable time for the cylinder drift at other oil temperatures is specified in illustration 1. The specified time is for the value of the drift which is given in "Implement and Swing Cycle Times".
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| Illustration 1 | g00296667 |