- Underground Articulated Truck:
- AD55B (S/N: JNW1-UP)
The information in the above module has changed for AD55B (S/N: JNW117-127). Include the following information with the existing information.
Piston Pump (Hydraulic Fan) Pressure - Test and Adjust
| Required Tools | ||
| Part Number | Part Description | Qty |
| 177-7861 | Hose As | 1 |
| 6V-4143 | Coupler | 2 |
| 8T-0855 | Pressure Gauge (0 to 4,000 kPa (0 to 580 psi)) | 1 |
| 8T-0859 | Pressure Gauge (0 to 25,000 kPa (0 to 3600 psi)) | 1 |
 |
Rotating fan blades can result in personal injury or death. Stop the engine and allow the fan to come to a complete stop before making any test or adjustment. Before starting the engine, make sure all of the finger guards are installed and the guard door is closed. Do not allow any tools or test equipment to protrude or vibrate into the path of the rotating fan blades. |
 |
|
Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
|
|
Personal injury or death can result from sudden machine movement. Sudden movement of the machine or release of oil pressure can cause injury to persons on or near the machine. To help prevent possible injury or death, refer to the information in Testing and Adjusting, "Machine Preparation for Troubleshooting". |
|
| NOTICE |
|---|
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "AVSpare Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on AVSpare products. Dispose of all fluids according to local regulations and mandates. |
Minimum Controlled Pump Pressure - Test and Adjust
Note: When the hydraulic fan piston pump is producing minimum pump pressure, the fan motor will rotate at the minimum rpm.
- Park the machine on a smooth, level surface.
- Place the transmission control lever in the NEUTRAL position.
- Engage the parking brake.
- Stop the engine.
- Connect a 8T-0855 Pressure Gauge to a 177-7861 Hose As .
 | |
| Illustration 1 | g01387946 |
(1) Hydraulic fan piston pump (2) Pressure tap | |
- Remove the protective cover from pressure tap (2). Connect the pressure gauge to pressure tap (2) on hydraulic fan piston pump (1) .
- Connect the AVSpare Electronic Technician (ET) to the diagnostic port in the operator station.
- Start the engine. Warm the hydraulic oil to a minimum temperature of 65° ± 3°C (150° ± 5°F).
- Select the Diagnostic tab in ET.
 | |
| Illustration 2 | g01479293 |
- Set the engine fan bypass to 100%.
 | |
| Illustration 3 | g01479312 |
- Run the engine at high idle.
- The minimum controlled pump pressure should read 1400 ± 100 kPa (200 ± 15 psi).
- If the pressure is not correct, stop the engine.
- Hold adjustment screw (3) in place and loosen the locknut.
 | |
| Illustration 4 | g01827993 |
(3) Adjustment screw | |
- Turn adjustment screw (3) clockwise in order to increase the pressure, or turn adjustment screw (3) counterclockwise in order to decrease the pressure.
- Repeat Step 8 through Step 15 until the minimum controlled pump pressure is obtained.
Maximum Controlled Pump Pressure - Test and Adjust
- Park the machine on a smooth, level surface.
Note: When the hydraulic fan piston pump is producing maximum controlled pump pressure, the fan motor will rotate at the maximum rpm.
- Place the transmission control lever in the NEUTRAL position.
- Engage the parking brake.
- Stop the engine.
- Connect a 8T-0859 Pressure Gauge to a 177-7861 Hose As .
| | |
| Illustration 5 | g01387946 |
(1) Hydraulic fan piston pump (2) Pressure tap | |
- Remove the protective cover from pressure tap (2). Connect the pressure gauge to pressure tap (2). Pressure tap (2) is located on hydraulic fan piston pump (1) .
- Connect the AVSpare Electronic Technician (ET) to the diagnostic port in the operator station.
- Start the engine. Warm the hydraulic oil to a minimum temperature of 65° ± 3°C (150° ± 5°F).
- Select the Diagnostic tab in ET.
| | |
| Illustration 6 | g01479293 |
- Set the engine fan bypass to 0%.
| | |
| Illustration 7 | g01479312 |
- Run the engine at 2000 rpm.
- Check the maximum controlled pump pressure.
- The maximum controlled pump pressure should read 22000 ± 700 kPa (3200 ± 100 psi).
- If the maximum controlled pump pressure is not correct, stop the engine.
 | |
| Illustration 8 | g01827994 |
(4) Adjustment screw | |
- Hold adjustment screw (4) and loosen the locknut.
- Turn adjustment screw (4) clockwise in order to increase the pressure. Turn adjustment screw (4) counterclockwise in order to decrease the pressure.
- Repeat Step 8 through Step 16 until the maximum controlled pump pressure is obtained.
Note: Do not adjust the minimum controlled pump pressure once the maximum controlled pump pressure is obtained.