- Underground Articulated Truck:
- AD55 (S/N: ANW1-UP; DNW1-UP)
Description of Change: An improved monitoring system is now used to monitor primary and secondary steering pump flow.
Adaptable To: The new monitoring system is effective in production with the following machines:
- AD55 (S/N: DNW608-UP)
- AD55 (S/N: ANW1-UP) (S/N: DNW1-607)
| Required Parts | ||
| Qty | Part Number | Description |
| 1 | 9EQ7629 | Manifold |
| 1 | 3E-6429 | Flow Switch |
| 2 | 7X-0325 | Bolt |
| 1 | 4J-0523 | O-Ring Seal |
| 1 | 6EL1677 | Warning Lamp Panel |
| 1 | 1DE3868 | Control Unit |
| 1 | 6EL7461 | Harness Assembly |
| 1 | 6EL7462 | Harness Assembly |
| 1 | 6EL7463 | Harness Assembly |
| 1 | 6EL7067 | Harness Assembly |
| 1 | 1DE0064 | Cable Tie |
| 2 | 130-5300 | Clip |
| 6 | 4D-7794 | Clip |
| 1 | 116-0118 | Clip |
| 1 | 119-6105 | Grommet |
| 1 | 7G-7053 | Grommet |
Procedure to Install Primary and Secondary Steering Monitoring System
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Personal injury or death can result from machine articulation or movement. Machine frames can move and a person can be crushed. Connect the steering frame lock link between the front and rear frames before working on machine. Do not disconnect the lock link until the machine is made operational and the commissioning procedure is completed. |
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Personal injury or death can result from escaping fluid under pressure. Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue, causing serious injury, and possible death. Always use a board or cardboard when checking for a leak. Do not check for pin hole leaks in pump or motor hoses during a steer stall condition. If fluid is injected into your skin, it must be treated by a doctor familiar with this type of injury immediately. |
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| NOTICE |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates. |
- Move the machine to a smooth horizontal location that is away from operating machines and away from personnel.
- Engage the parking brake. Place wheel blocks in front of the wheels and behind the wheels.
- Install the steering frame lock.
- Turn the disconnect switch and the key start switch to the OFF position.
- Ensure all oil pressure is released before any fitting, hose or component is loosened, tightened, removed, or adjusted.
- Disconnect hose assembly (1). Remove connector (2), two bolts (3) and manifold (4). Discard bolts (3) and manifold (4) .
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| Illustration 1 | g01343944 |
Secondary steering diverter valve | |
- Install items (5) through (9) .
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| Illustration 2 | g01343946 |
Secondary steering diverter valve (1) Hose Assembly (2) Connector (5) 7X-0325 Bolt (6) 130-5300 Clip (7) 3E-6429 Flow Switch (secondary steering) (8) 9EQ7629 Manifold (9) 4J-0523 O-Ring Seal | |
- Install connector (2) and connect hose assembly (1) .
- Disconnect flow switch (10) from the machine harness.
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| Illustration 3 | g01343943 |
Steering pump | |
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| Illustration 4 | g01343945 |
Steering pump | |
- Connect harness assembly (13) to primary and secondary steering flow switches.
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| Illustration 5 | g01343508 |
Cross beam (11) 6EL7461 Harness Assembly (12) 4D-7794 Clip (13) 6EL7067 Harness Assembly (A) To secondary steering flow switch (B) To primary steering flow switch | |
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| Illustration 6 | g01345745 |
(13) 6EL7067 Harness assembly (A) Connect to 3E-6429 Flow Switch (secondary steering) (B) Connect to 3E-6429 Flow Switch (primary steering) | |
- Connect harness assembly (11) to harness assembly (13). Install three clips (12) to secure the harness.
- Connect harness assembly (15) to harness assembly (11). Install three cable ties (14) to secure harness assembly (11) .
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| Illustration 7 | g01343512 |
Side view (11) 6EL7461 Harness Assembly (14) 1DE0064 Cable Tie (15) 6EL7462 Harness Assembly | |
- Install three clips (12) and one clip (16) to secure harness assembly (15) .
Note: Harness assembly (15) to be installed inside cover assembly.
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| Illustration 8 | g01343926 |
Outside cab (covers removed) (11) 6EL7461 Harness Assembly (12) 4D-7794 Clip (15) 6EL7462 Harness Assembly (16) 116-0118 Clip (17) 119-6105 Grommet (18) 6EL7463 Harness Assembly | |
- Install grommet (17).
- Connect harness assembly (18) to harness assembly (15). Install harness assembly (18) through grommet (17) .
- Install harness assembly (18) as shown in Illustration 9.
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| Illustration 9 | g01343934 |
Inside cab (17) 119-6105 Grommet (18) 6EL7463 Harness Assembly | |
- Install harness assembly (18) as shown in Illustration 10 and Illustration 11.
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| Illustration 10 | g01343935 |
Front of cab with cover removed (14) 1DE0064 Cable Tie (18) 6EL7463 Harness Assembly (19) 7G-7053 Grommet (H) (wire L912-WH) (J) (wire E987-WH) | |
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| Illustration 11 | g01343936 |
View of dash from seating position (with dash removed) (14) 1DE0064 Cable Tie (18) 6EL7463 Harness Assembly (20) Frame Ground | |
- Install nine cable ties (14) and grommet (19) .
- Attach frame ground (20) .
- Remove harness connector J2-38 (wire L912-WH) from the Powertrain Electronic Control Module (ECM).
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| Illustration 12 | g01344478 |
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| Illustration 13 | g01345744 |
(18) 6EL7463 Harness Assembly (H) (wire L912-WH) (J) (wire E987-WH) (K) Connector | |
- Install harness connector (H) (wire L912-WH) to Powertrain ECM J2-38.
- Install (wire L912-WH) that was removed in Step 20 to harness connector 3 (wire L912-WH) of connector (K) .
- Remove harness connector J2-24 (wire E987-WH) from the Powertrain ECM.
- Install harness connector (J) (wire E987-WH) to Powertrain ECM J2-24.
- Install (wire E987-WH) that was removed in Step 23 to harness connector 4 (wire E987-WH) of connector (K) .
- Install warning lamp panel (21) .
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| Illustration 14 | g01343937 |
(18) 6EL7463 Harness Assembly (21) 6EL1677 Warning Lamp Panel (H) Connects to cab harness | |
- Connect harness assembly (18) to warning lamp panel (21) .
- Connect harness connectors (H) to cab harness.
- Install control unit (22) .
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| Illustration 15 | g01343938 |
Foot rest underside (18) 6EL7463 Harness Assembly (22) 1DE3868 Control Unit | |
- Install harness assembly (18) as shown in Illustration 15.
Operation of the Steering Warning Indicator
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| Illustration 16 | g01365694 |
| Primary/Secondary Steering Indicator - Steering System Failure (23) - This indicator will be on when there is a steering system failure in either the primary or secondary steering systems. Stop the machine immediately and investigate the cause. |
Note: The secondary steering system only operates while the machine is moving.
| NOTICE |
|---|
If the primary/secondary steering indicator flashes, cease operation, quickly move the machine to a safe area and shut the machine down. Inspect and rectify the cause of the problem before recommencing operation. |