| Bulldozer Lift Cylinders Speed Test | ||
|---|---|---|
| Specification | Actual | |
| RAISE (ground level to maximum height) | 2.0 ± 0.2 | |
| LOWER powerdown (maximum height to ground level) | 1.3 ± 0.2 | |
| LOWER float (maximum height to ground level) | 1.1 ± 0.2 | |
| Bulldozer Tilt Cylinder Speed Test | ||
|---|---|---|
| Specification | Actual | |
| TILT (full retraction to full extension) | 0.8 ± 0.2 | |
| TILT (full extension to full retraction) | 0.7 ± 0.2 | |
| Bulldozer Angle Cylinders Speed Test | ||
|---|---|---|
| Specification | Actual | |
| ANGLE (full left to full right) | 2.0 ± 0.2 | |
| Ripper Cylinder Speed Test | ||
|---|---|---|
| Specification | Actual | |
| RAISE (ground to maximum height) | 2.0 ± 0.2 | |
| LOWER (maximum height to ground) | 2.5 ± 0.2 | |
| Power Pitch Cylinder Speed Test | ||
|---|---|---|
| Specification | Actual | |
| EXTEND (full retraction to full extension) | 1.1 ± 0.2 | |
| RETRACT (full extension to full retraction) | 1.1 ± 0.2 | |
| Lift Cylinder Drift | |||
|---|---|---|---|
| Oil Temperature | 28°C to 48°C (80°F to 120°F) | 49°C to 68°C (120°F to 155°F) | 69°C to 88°C (155°F to 190°F) |
| Maximum Allowable Drift | |
|
|
| Time Interval (minutes) | 5.0 | 2.75 | 1.75 |
| Tilt Cylinder Drift | |||
|---|---|---|---|
| Oil Temperature | 28°C to 48°C (80°F to 120°F) | 49°C to 68°C (120°F to 155°F) | 69°C to 88°C (155°F to 190°F) |
| Maximum Allowable Drift | |
|
|
| Time Interval (minutes) | 5.0 | 2.75 | 1.75 |
| Ripper Cylinder Drift | |||
|---|---|---|---|
| Oil Temperature | 28°C to 48°C (80°F to 120°F) | 49°C to 68°C (120°F to 155°F) | 69°C to 88°C (155°F to 190°F) |
| Maximum Allowable Drift | |
|
|
| Time Interval (minutes) | 5.0 | 2.75 | 1.75 |
The Operational Checks can be used to find any of the following problems: leakage in the system, a bad valve, and a bad pump. The speed of the rod movement can be measured to check the condition of the cylinders and the condition of the pump.
The oil in the hydraulic system must be the oil which is recommended in the Operation and Maintenance Manual, and at a temperature of
- Move the machine to a smooth, horizontal location that is away from operating machines and away from personnel.
- Permit only one operator on the machine. Keep all other personnel away from the machine or in the operator sight.
- Place the steering control lever in the NEUTRAL position.
- Engage the parking brake.
- Lower the attachments to the ground.
- Stop the engine.
Extend the cylinder and retract the cylinder. Repeat several times for each cylinder.
- Watch the operation of the cylinder. Movement must be uniform and regular.
- Listen for noise from the pump.
- Listen for the sound of the relief valves. The relief valves must not open while the attachment cylinders are in motion.
The oil in the system must be the oil which is recommended in Operation and Maintenance Manual, and at a temperature of
Identify the speed of each cylinder. Compare these values to the values in the chart. Equal values indicate normal circuit operation.
If the speed of a cylinder is too slow, check that circuit for cylinder drift.
The drift rates change with different conditions of the hydraulic components. The drift rates change with machine operation, hydraulic oil temperature, etc. Before you measure drift of the cylinder rods, the cylinders must be extended at least five times.
Cylinder rod drift is caused by the following conditions:
- Loose oil line connections or damaged oil lines with oil leaks
- Leakage around the piston seals in the cylinder
- Leakage in the control valve (worn valve section and worn spool valve)
- Leakage through check valves or makeup valves
Measure lift cylinder rod drift by using the following procedure:
- Check hydraulic oil temperature.
- Lift the bulldozer until the cutting edge is approximately
254 mm (10.0 inch) off the ground. With the lift control lever in the HOLD position, stop the engine. - Obtain a measurement of the distance of cylinder drift over time. Compare the values to the values in the chart.
Note: The drift distances in the chart are for new machines.
Note: Take a measurement from the blade to the ground for this chart.
Measure tilt cylinder rod drift by using the following procedure:
- Check hydraulic oil temperature.
- Fully retract the tilt cylinder.
- Lower the bulldozer to lift the front idlers off the ground. Move the control levers to the HOLD position and stop the engine.
- Obtain a measurement of the distance of cylinder drift over time. Compare the values to the values in the chart.
Note: The drift distances in the chart are for new machines.
Note: Take a measurement from the blade to the ground for this chart.
Drift Test for Ripper Cylinder
Measure ripper cylinder rod drift by using the following procedure:
- Check hydraulic oil temperature.
- Lift the ripper so that the ripper teeth are approximately
254 mm (10.0 inch) off the ground. Move the ripper control lever to the HOLD position. Stop the engine. - Obtain a measurement of the distance of cylinder drift over time. Compare the values to the values in the chart.
Note: The drift distances in the chart are for new machines.
Note: Take a measurement from the blade to the ground for this chart.