- Machine Control and Guidance Products:
- ACCUGRADE (S/N: LGC1-UP)
- CAES ULTRA (S/N: 2TZ1-UP)
Introduction
This Special Instruction provides information for determining the state of the seal for the antenna of a TC900B or a TC900C radio.
Important Safety Information
Work safely. Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. A person must be alert to potential hazards. This person should also have the necessary training, skills, and tools in order to perform these functions properly.
Safety precautions and warnings are provided in this instruction and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons. Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. Therefore, the warnings in this publication and the warnings that are on the product are not all inclusive.
If a tool, a procedure, a work method, or an operating technique that is not specifically recommended by Caterpillar is used, you must ensure that it is safe for you and for other people to use. You should ensure that the product will not be damaged or the product will not be made unsafe by the operation, lubrication, maintenance, or repair procedures that are used.
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Do not operate or work on this machine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manuals. Failure to follow the instructions or heed the warnings could result in injury or death. Contact your Caterpillar dealer for replacement manuals. Proper care is your responsibility. |
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Accidental engine starting can cause injury or death to personnel working on the equipment. To avoid accidental engine starting, disconnect the battery cable from the negative (−) battery terminal. Completely tape all metal surfaces of the disconnected battery cable end in order to prevent contact with other metal surfaces which could activate the engine electrical system. Place a Do Not Operate tag at the Start/Stop switch location to inform personnel that the equipment is being worked on. |
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| Illustration 1 | g00037860 |
Use steps and handholds whenever you mount the machine. Use steps and handholds whenever you dismount the machine. Before you mount the machine, clean the step and the handholds. Inspect the step and handholds. Make all necessary repairs.
Face the machine whenever you mount the machine and whenever you dismount the machine. Maintain a three-point contact with the step and with handholds.
Note: Three-point contact can be two feet and one hand. Three-point contact can also be one foot and two hands.
Do not mount a moving machine. Do not dismount a moving machine. Never jump off the machine. Do not try to mount the machine when you carry tools or supplies. Do not try to dismount the machine when you are carrying tools or supplies. Use a hand line to pull equipment onto the platform. Do not use any controls as handholds when you enter the cab or when you exit the cab.
Preparation
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Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. Prevent possible injury by performing the procedure that follows before working on the machine. Move the machine to a smooth horizontal location. Move away from working machines and personnel and lower the bucket to the ground. Permit only one operator on the machine. Keep all other personnel away from machine or in view of the operator. Engage the parking brake. Stop the engine. Move the hydraulic control levers to all positions to release the pressure in the hydraulic system. |
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In addition to the normal safety precautions that are taken in the day to day operation of heavy machinery, the following steps are recommended:
- Move the machine to a suitable location. The location should be smooth, level, and out of direct sunlight.
- Lower all of the work tools to the ground.
- When possible, maintain ownership of the keys for the machine.
Required Tools
- 1 1/2 inch wrench or an adjustable wrench
- 291-1384 Wiring Harness
- General materials for cleaning
Parts List
- 211-0100 Antenna
General Information
If the seal of the antenna is not intact, then the antenna could contain moisture. Excess moisture can cause the following problems:
- The radio does not receive corrections.
- The operating range of the radio is reduced.
Note: The typical operating range of the radio is 4 ± 1 km (2.5 ± 0.6 miles) for line of sight with the radio at the GPS base station.
Before inspecting the antenna, perform general troubleshooting of the radio. Resolve any issues before inspecting the antenna. If the inspection indicates that the antenna contains moisture, replace the antenna.
Troubleshooting the Radio
- Verify that there is power to the radio. The amber light is ON if there is power to the radio.
- Verify that the other radios on the site are receiving corrections, and that the radio which is being troubleshot is not receiving corrections.
- Verify that the onboard systems are properly connected to the radio.
The radio should be listed in the "Diagnostic" display in the onboard AccuGrade or the CAES system.
ReferenceFor CAESultra Systems, refer to Systems Operation, KENR6338, "CAES".
ReferenceFor AccuGrade Systems with a CD550 Display, refer to Troubleshooting, KENR5966, "AccuGrade GPS".
ReferenceFor AccuGrade Systems with a CD700 Display, refer to Troubleshooting, KENR5966, "AccuGrade - CD700 Grade Control System (GPS/ATS/Laser)".
- Attach the 291-1384 Wiring Harness to the radio. Use MCGFlash in order to verify that the radio is properly configured for the following parameters:
- "Country"
- "Rover"
- "Network Number"
- "Protocol"
ReferenceRefer to Special Instruction, REHS2585, "MCGFlash User Guide".
- "Country"
Inspecting the Antenna
- Remove power to the radio.
- Disconnect the wiring harness from the radio.
- Remove the radio from the machine.
- By using the wrench flats (3) of the plastic barrel on the antenna, remove the antenna from the radio. Use a 1 1/2 inch wrench or use an adjustable wrench.
Note: Only use the wrench flats to loosen the antenna. Damage may occur to the antenna if any other location is used.
Note: Stop this procedure if the antenna cannot be easily unscrewed from the radio. Damage may occur to the radio if the antenna is vigorously removed.
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| Illustration 2 | g01540814 |
The 211-0100 Antenna is shown. (1) Junction at cap and barrel (2) Junction at barrel and base (3) Wrench flats | |
- Inspect the antenna connector (4) on the radio. Check for corrosion. Check for debris. Clean the connector of all debris.
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| Illustration 3 | g01540878 |
The antenna connector (4) on the radio is shown. No corrosion is present. | |
- Observe the barrel of the antenna for possible areas of entry of moisture. Refer to Illustration 2.
Leaks can occur if there are large gaps or cracks in the following areas:
- Junction at cap and barrel (1)
- Junction at barrel and base (2)
OK - Gaps or cracks are not present.
Not OK - Gaps or cracks are present.
If the antenna is not OK, replace the antenna with a 211-0100 Antenna .
- Junction at cap and barrel (1)
- Inspect the interior of the antenna for signs of moisture entry. Refer to Illustrations 4 and 5.
OK - The brass center conductor (6) is shiny. No corrosion is present. The red O-ring is in place and undamaged. There is no debris.
Not OK - The brass center conductor (6) is a dull gray or green in color. There is white corrosion on the connector of the antenna.
If the antenna is not OK, replace the antenna with a 211-0100 Antenna .
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| Illustration 4 | g01540854 |
The interior of the antenna is shown. The brass center conductor (6) is undamaged. | |
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| Illustration 5 | g01540873 |
The interior of the antenna is shown. The brass center conductor (6) indicates damage due to moisture. | |
Installation
- If this is a new antenna, verify that there is a green dot on the interior of the antenna.
Note: New antennas are marked with a green dot. The dot indicates that the antenna has received additional testing from the supplier.
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| Illustration 6 | g01540353 |
New antenna with green dot (7) | |
- Verify that the red O-ring (8) is fully seated in the groove of the antenna.
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| Illustration 7 | g01540813 |
An antenna with a properly seated O-ring (8) is shown. | |
- Carefully thread the antenna onto the radio. Use the wrench flats (3). Refer to Illustration 2. Torque the antenna to 8 N·m (6 lb ft).
Note: Only use the wrench flats to tighten the antenna. Damage may occur to the antenna if any other location is used.
- Mount the radio on the machine.
- Connect the wiring harness to the radio.
- Supply power to the radio.
- Verify that there is power to the radio. The amber light is ON if there is power to the radio.
- Verify that the radio is synchronized with the base station and that the radio is receiving corrections. The green LED is ON if these conditions are TRUE.
Note: One or two minutes may be required to complete the synchronization process.
- Verify that the operating range of the radio is 4 ± 1 km (2.5 ± 0.6 miles) for line of sight with the radio at the GPS base station.