AS4173 Asphalt Screed Machine Systems Caterpillar

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Diesel engine exhaust contains products of combustion which may cause personal injury. Always start and operate the engine in a well ventilated area, and, if in an enclosed area, vent the exhaust to the outside.

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Hot parts or hot components can cause burns or personal injury. Do not allow hot parts or components to contact your skin. Use protective clothing or protective equipment to protect your skin.

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In order to prevent personal injury from accidental screed movement, lock the screed in the RAISED position by using the travel lock lever in order to extend the lock pins, after the screed is fully raised.

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Shock/Electrocution Hazard! Do not work on this equipment 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 serious injury or death.

Specifications

Illustration 1	g03431185
Left Junction box (4) Black Wire - Tamper Bar Heater (5) Black Wire - Screed Plate Heater (6) Blue Wire - Tamper Bar Heater (7) Blue Wire - Screed Plate Heater

Illustration 2	g03431336
Right Junction box (4) Black Wire - Tamper Bar Heater (5) Black Wire - Screed Plate Heater (6) Blue Wire - Tamper Bar Heater (7) Blue Wire - Screed Plate Heater

Illustration 3	g03431276
Center Junction box (4) Black Wire - Tamper Bar Heater (5) Black Wire - Screed Plate Heater (6) Blue Wire - Tamper Bar Heater (7) Blue Wire - Screed Plate Heater

Illustration 4	g03431285
Center Junction box (a) Left Tamper Bar Heater (b) Left Screed Plate Heater (c) Right Tamper Bar Heater (d) Right Screed Plate Heater

Introduction

Each section of the screed has two heating elements, one for the plate and one for the tamper bar. This procedure describes the steps to test any of the heating elements.

Required Tools

Test Preparation

1. Drive the machine to a smooth, horizontal surface.

2. Lift the screed and fully extend the screed extenders. Refer to the Operation and Maintenance Manual of the tractor for this procedure.

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Illustration 5	g03430501

3. Move screed lock levers (1) into the LOCKED position. Refer to the Operation and Maintenance Manual of the tractor for this procedure.

4. Stop the engine. Refer to the Operation and Maintenance Manual of the tractor for this procedure.

5. Move the electrical disconnect switch to the OFF position. Refer to the Operation and Maintenance Manual of the tractor for this procedure.

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Illustration 6	g03430515
Right Extender Shown, Other Boxes Similar

6. Remove four screws (2). Remove cover (3) from the electrical box on the screed section being tested.

7. Perform the test procedure.

Test Procedure for Screed Plate Heaters

1. Disconnect blue wire (7) from the contact block for the heater being tested. Refer to "Specifications" for wire location.

2. Disconnect black wire (5) from the contact block for the heater being tested. Refer to "Specifications" for wire location.

3. Use Tool (A) to measure the resistance between the blue wire and the black wire. The resistance should be 32 to 37 Ohms. If the resistance is outside the specified range, replace the screed plate heater.

4. Reconnect blue wire (7) to the contact block. Reconnect black wire (5) to the contact block.

5. Position cover (3), and install four screws (2) .

Test Procedure for Tamper Bar Heaters

1. Disconnect blue wire (6) from the contact block for the heater being tested. Refer to "Specifications" above for wire location.

2. Disconnect black wire (4) from the contact block for the heater being tested. Refer to "Specifications" above for wire location.

3. Use Tool (A) to measure the resistance between the blue wire and the black wire. The resistance should be 97 to 111 Ohms. If the resistance is outside the specified range, replace the tamper bar heater.

4. Reconnect blue wire (6) to the contact block. Reconnect black wire (4) to the contact block.

5. Position cover (3), and install four screws (2) .