Process for Removal and Installation of Screed Plates and Nose Bars{6640, 6643} Caterpillar

Extend-A-Mat Screed:

8B (S/N: 3GL1-UP; 3JM1-UP; 3KM1-UP; 3LM1-UP; 5PL1-UP; 7NR1-UP)

8-16B (S/N: 2JN1-UP; 7MR1-UP; BLK1-UP; BWL1-UP)

10B (S/N: 3EL1-UP; 3FL1-UP; BKB1-UP; 3MM1-UP; 3NM1-UP; 3PM1-UP; 3RM1-UP)

10-20B (S/N: 2KN1-UP; 2LN1-UP; AGT1-UP; 3HL1-UP; BWN1-UP)

10-20WB (S/N: 2MN1-UP; 3KL1-UP)

Introduction

This Special Instruction, REHS0821 provides the information that is necessary in order to install the Screed Plates and the Nose Bars on Asphalt Screeds.

Removal of the Main Plate

Note: All of the torque values in the following instructions supersede any previous specifications.

Note: Tools needed: You will need a 127-0380 Fixture Assembly . You will need a 127-0383 Straight Edge .

Illustration 1	g00703913

1. Install the pins in the tow arms. Lower the screed on a surface that is flat. You must use the thickness controls in order to level the screed.

Show/hide table



Illustration 2	g00703919

2. Place a level on the pre-strike-off and verify that the pre-strike-off is vertical. If the pre-strike-off is not vertical, use the thickness controls until the pre-strike-off is vertical.

Show/hide table



Illustration 3	g00703924

3. Raise the screed and lower the screed so that the screed is on the travel locks.

Show/hide table



Illustration 4	g00703930

Show/hide table



Illustration 5	g00703934

4. Position a straight edge lengthwise on the bottom of the leading edge of the screed plate. The leading edge should have no crown. Use the crown control in order to eliminate any crown in the leading edge of the screed plate. Refer to Operation and Maintenance Manual, "Crown Control" for information on adjusting the crown. If no crown is present proceed to the next step.

   Note: The straight edge should be the same length as the main screed plate. If the straight edge is not the same length as the main screed plate you should use a straight edge. No shorter than 1524 mm (5 ft) can be used. Verify the flatness at the center of the screed plate. After you verify the center of the screed plate you should verify each side of the screed plate. After any adjustments are made, verify that the adjustments did not adversely affect the area that was previously leveled.

   Note: If a straight edge is not available, you can use a stringline. The stringline is not as accurate as a straight edge.

Show/hide table



Illustration 6	g00703946

5. When all of the crown is eliminated from the screed plate, start the engine and extend the screed. Lower the screed to a flat surface and stop the engine.

   Note: The screed extensions should be extended. This will allow access for removal of two of the nuts that are used in order to hold the deflector plates to the main screed.

Show/hide table



Illustration 7	g00703948

6. Remove the six nuts and the six washers that hold the center splice in place.

Show/hide table



Illustration 8	g00703955

7. Remove the three allen head bolts from the right side covers and remove three allen head bolts from the left side covers. Remove the covers.

8. On the 8-16B screed, remove the 16 nuts and the 16 washers from the studs on the back of the deflector plates. On the 10-20B screeds, remove twenty nuts and twenty washers.

Show/hide table



Illustration 9	g00703971

9. Remove the right hand deflector plate. Remove the left hand deflector plate.

Show/hide table



Illustration 10	g00704286

10. Install the retaining bolts and install the retaining spacers between the main frames at the rear of the screed.

Show/hide table



Illustration 11	g00704272

Note: The nose bar will support the front of the main frames until the new plates are installed. Do not remove the nose bar until you are instructed to remove the nose bar.

Show/hide table



Illustration 12	g00704371

11. Remove the twelve nuts and remove the twelve washers that hold the front of the screed plate to the main frames.

Show/hide table



Illustration 13	g00704016

12. Remove the twelve nuts and remove the twelve washers that hold the trailing edge of the screed plate to the main frame.

Note: For easier installation of the screed plate, You should mark the number of shims or you should note the number of shims that are under each stud.

13. Start the engine. Raise the screed from the screed plate. Move the machine forward. Move the machine away from the screed plate. Stop the engine. Apply the parking brake.

14. Move the old screed plate to a safe work area.

Prior to Installation

Show/hide table



Illustration 14	g00704018

1. Scrape old asphalt from the main frame. Scrape any asphalt from the area of the stud seats.

2. You should use thread cleaner in order to remove any oil, dirt, and asphalt from the nuts, washers,and the studs on the deflector plates.

3. Inspect the burner chambers for wear. Examine the chambers for warping. Examine the chambers for holes. Examine the chambers for burned insulation. If any of these conditions exist, refer to the Disassembly and Assembly Manual, KENR2615, "Remove and Install Lower Burner Chamber".

Show/hide table



Illustration 15	g00704022

4. Inspect the adjuster nuts for the rear for free movement. If the adjuster nuts do not move freely, you must replace the old adjuster nuts with new adjuster nuts.

5. Tap the holes in the new screed plate. You should thread cleaner in order to clean the tapped holes. You should thread cleaner in order to clean the studs. Apply 4C-9507 Compound or Loctite 272 to the threads of the studs. Torque the studs to 51 ± 3 N·m (38 ± 2 lb ft).

   Note: Caterpillar® should be at the top and in the front when you install the studs and when you align the plates. The part number should be at the top and in the front when you install the studs and when you align the plates. If this is not done properly, the plate will not line up correctly.

Show/hide table



Illustration 16	g00704028

Note: The long studs should be installed in the holes on the trailing edge of the screed plate. The short studs should be installed on the leading edge.

6. Grind any portion of the studs that protrude beyond the screed plate so that the studs are flat with the screed plate.

   Note: The studs must be ground flat with the screed plate before the 4C-9507 Compound is set. The studs must be ground flat with the screed plate before the Loctite 272 is set. Heat is generated when the studs are ground. Heat could cause the 4C-9507 Compound to lose locking properties.

Installation of the Main Plate

Show/hide table



Illustration 17	g00704033

1. Place the new screed plate on a flat surface.

Note: You can help level the screed plate if you install the shims in the same location.

Show/hide table



Illustration 18	g00704034

2. Start the engine and back up the tractor until the screed is directly above the new plate. Slowly lower the screed. Verify that the studs in the plate line up with the holes in the main frame.

Show/hide table



Illustration 19	g00704039

3. Install the twelve nuts and install the twelve washers that hold the trailing edge of the screed plate to the main screed frames. Apply 5P-3931 Anti-Seize Compound to the nuts.

Show/hide table



Illustration 20	g00704409

4. Install the six outermost nuts and install the six outermost washers that hold the front edge of the screed plate to the main screed frames. There will be three nuts and there will be three washers from the left side and three nuts and three washers from the right side. Apply 5P-3931 Anti-Seize Compound to the nuts.

Show/hide table



Illustration 21	g00704043

5. Raise the screed from the ground and set the screed on the travel locks.

6. Install the six inside nuts and install the six inside washers that hold the front edge of the screed plate to the main screed frames. Apply 5P-3931 Anti-Seize Compound to the nuts.

Removal of the Main Nose Bars

1. Remove the twelve nuts and remove the twelve washers from the front row of nuts that hold the nose bars to the main frame.

Show/hide table



Illustration 22	g00704047

2. Remove the three nose bars from the main screed frames.

   Note: There will be shims between the screed frame and the nose bars. The location of the shims should be noted. The information should be used in future assembly.

Level the Leading Edge of the Main Plate

Note: You will need a straight edge that is the length of the main screed. You will need two screed leveling fixture assemblies. You will need a straight edge that is the length of the main screed. You will need a stringline that is the length of the main screed. You will need one of the three options.

Note: A straight edge and two screed leveling fixture assemblies are the preferred tools for this procedure. A stringline or a straight edge can be used. A stringline or a straight edge will be less accurate.

Show/hide table



Illustration 23	g00704049

1. Lower the screed on the travel locks.

Show/hide table



Illustration 24	g00704057

2. Place the straight edge and the fixture assemblies on the leading edge of the screed. Make sure that no crown is present. If no crown is present, proceed to step 4.

   Note: If you use a straight edge that is shorter than the width of the plate, begin measuring and begin adjusting in the middle of the plate. After you level the center of the plate, move to either the left side of the plate or move to the right side of the plate. Then move to the remaining side. After you complete this sequence, start the sequence again. Start in the middle in order to ensure that the adjustments did not affect the other parts of the plate.

Show/hide table



Illustration 25	g00704173

3. Use the crown controls in order to adjust the screed plates. No crown should be present at the front of the screed.

Show/hide table



Illustration 26	g00704179

4. You should check the flatness of the screed plate by measuring the gap between the screed plate and the straight edge or by measuring the gap between the plate and the stringline. If the leading edge is not flat within 0.75 mm (0.030 inch), shims must be added or shims must be removed between the leading edge of the screed plate and the screed frame. When you add shims, you should loosen the nuts on either side of the stud that needs to be shimmed. When you reinstall the nuts on the studs of the screed plate, use 5P-3931 Anti-Seize Compound . The studs of the screed plate should be torqued to 105 N·m (77 lb ft). Remove the retaining bolt from the back of the screed.

Reinstalling and Adjusting the Nose Bars

Illustration 27	g00704180

1. Tap the holes in the new nose bars. Clean the tapped holes with thread cleaner. Clean the studs with thread cleaner. Apply 4C-9507 Compound or Loctite 272 to the threads of the studs. Torque the studs to 51 ± 3 N·m (37 ± 2 lb ft).

Show/hide table



Illustration 28	g00704312

2. In order to install the three nose bars to the main screed frame, you must install the twelve nuts and you must install the twelve washers that hold the nose bars to the main frames. Apply 5P-3931 Anti-Seize Compound to the nuts during assembly.

Show/hide table



Illustration 29	g00704317

3. Use a scale or use calipers in order to verify the nose bar overhang. The nose bar should be between 0 to 0.75 mm (0 to 0.030 inch) below the screed plate. If the nose bar is above the screed plate, shims can be added between the nose bar and the screed frame in order to bring the overhang within specifications.

Show/hide table



Illustration 30	g00704317

4. Check the flatness of the nose bar with a straight edge or check the flatness of the nose bar with a stringline. The nose bar must be flat within 1.5 mm (0.060 inch). Flatness is adjusted by shimming the nose bar. Torque the nuts to 105 N·m (77 lb ft).

   Note: After you shim the nose bar, verify that no part of the nose bar hangs over the screed plate by more than 0.75 mm (0.030 inch). If an excessive overhang is created during assembly, you should replace the nose bar.

Level the Trailing Edge of the Main Plate

Illustration 31	g00704458

1. Remove the retaining bolts and remove the spacers between the main frame at the rear of the screed.

Show/hide table



Illustration 32	g00704329

2. Adjust the two outermost adjusters until there is a 9.525 mm (0.3750 inch) gap. The gap is between the screed plate spacer bar and the welded nuts on the bottom of the main frames. Torque the two outer adjuster nuts to 105 N·m (77 lb ft).

   Note: After you have adjusted the two outer adjusters to a 9.525 mm (0.3750 inch) gap, do not adjust the two outer adjusters again. All remaining adjustments must be made with the inner adjusters.

3. Move the straightedge and move the fixture assemblies to the trailing edge of the screed. Move the stringline to the trailing edge of the screed. Move the straightedge to the trailing edge of the screed. Move one of the three methods. The trailing edge of the screed should have no crown. The trailing edge of the screed must be flat within 0.75 mm (0.030 inch).

4. If the trailing edge is not flat within 0.75 mm (0.030 inch), you must loosen the nuts. Use the screed plate leveling adjusters in order to bring the screed plates within tolerance. One full turn of the hex nut will allow 2.108 mm (0.083 inch) of vertical plate motion. Torque adjuster nuts to 105 N·m (77 lb ft).

Remove the Extender Plates

1. Start the engine. Extend the screed. Lower the screed on a level surface. Stop the engine.

   Note: The instructions that follow refer to only ONE extender. In order to complete the entire procedure, follow the same process for the other side.

Show/hide table



Illustration 33	g00704338

2. Remove the four allen head screws that hold the extender deflector to the frame.

Show/hide table



Illustration 34	g00704346

3. Remove the deflector plate.

4. On the 8-16B Screed, remove the five nuts and remove the five washers that hold the extender screed plate leading edge to the extender frame. On the 10-20B Screed, remove six nuts and remove six washers.

5. On the 8-16B Screed, remove the five nuts and remove the five washers that hold the trailing edge of the screed plate to the extender frame. On the 10-20B Screed, remove six nuts and remove six washers.

6. Start the engine and raise the screed off the screed plate. Move the machine forward and stop the engine.

   Note: Verify the quantity of shims under each stud. Installation of the new screed plates will be less difficult.

7. Move the old screed to a safe area.

Prior to Installation

Show/hide table



Illustration 35	g00704354

1. Scrape any asphalt from the extender frame. Scrape any asphalt from the stud seat areas.

2. Use thread cleaner to remove oil, dirt, and asphalt from the nuts and from the washers that were removed.

   Note: Inspect the burner chambers. Examine the burner chambers for warping, holes, or burned insulation. If any of these conditions exist, refer to Disassembly and Assembly Manual, KENR2615, "Remove and Install Lower Burner Chamber".

Show/hide table



Illustration 36	g00704466

3. Inspect the rear adjuster nuts. The rear adjuster nuts should move. Replace the adjuster nuts if the nuts do not move freely.

Show/hide table



Illustration 37	g00704468

4. Tap the holes in the new screed plate. Clean the tapped holes and clean the studs with thread cleaner. Apply 4C-9507 Compound or Loctite 272 to the threads of the studs and torque the studs to 51 ± 3 N·m (37 ± 2 lb ft).

   Note: The Caterpillar® part number should be positioned on the top. The Caterpillar® part number should be positioned on the front and on the outside when you install the studs and when you align the plate. If this is not done properly, the plate will not line up.

   Note: The long studs should be installed in the holes on the trailing edge of the screed plate. The short studs should be installed on the leading edge.

5. Grind any portion of the studs that protrude beyond the screed plate. The studs should be flat with the screed plate.

   Note: You must grind the studs before the 4C-9507 Compound or the Loctite 272 has hardened. Heat is generated when the studs are ground. Heat could cause the 4C-9507 Compound or the Loctite 272 to lose locking properties.

Installation of the Extender Plate

1. Place the new screed plate on a flat surface.

   Note: The location of the shims should be noted. The information should be used in future assembly.

2. Start the engine. Back up the tractor until the screed is directly above the new plate. Slowly lower the screed. Verify that the studs in the plate line up with the holes in the extender frame.

3. On the 8-16B screed, install the five nuts and install the five washers that hold the trailing edge of the screed plate to the extender screed frame. Apply 5P-3931 Anti-Seize Compound to the nuts. On the 10-20B screed, install six nuts and install six washers.

4. On the 8-16B screed, install the five nuts and install the five washers that hold the leading edge of the screed plate to the extender screed frame. Apply 5P-3931 Anti-Seize Compound to the nuts. On the 10-20B screed, install six nuts and install six washers.

Show/hide table



Illustration 38	g00704479

5. Raise the screed from the ground and set the screed on the travel locks.

Removal of the Extender Nose Bar

Show/hide table



Illustration 39	g00704485

1. On the 8-16B screed, you should remove the front row of five nuts. On the 8-16B screed, you should remove the front row of five washers. The five nuts and the five washers hold the nose bar to the extender frame. On the 10-20B screed, remove the seven nuts and remove the seven washers that hold the nose bars to the extender frame.

Show/hide table



Illustration 40	g00704493

2. On the 8-16B screed, you should remove the nose bar from the extender screed frame. On the 10-20B screed, you should remove the nose bars from the extender frame.

   Note: There will be shims between the screed frame and the nose bar(s). The location of the shims should be noted. The information should be used in future assembly.

Leveling the Extender Plate Leading Edge

Note: You will need a straight edge. You will need twoleveling fixture assemblies. You will need a straight edge, and you will need a stringline. All of the measuring devices should be the length of the main screed.

Note: A straight edge and two screed leveling fixture assemblies are the preferred tools for this procedure. A straight edge or a stringline can be used if the combination of a straight edge and two leveling fixture assemblies are not available. A straight edge or a stringline will not be as precise as a straight edge and the two leveling fixture assemblies.

Show/hide table



Illustration 41	g00704501

1. Check the flatness of the screed plate by measuring the gap between the screed plate and the straight edge or the gap between the stringline and the screed plate. If the leading edge is not within 0.75 mm (0.030 inch) of being flat, you must add shims. If the leading edge is not within 0.75 mm (0.030 inch) of being flat you must remove shims. You must add the shims between the leading edge of the screed plate and the screed frame. You must remove the shims between the leading edge of the screed plate and the screed frame. You should loosen the stud nuts in order to add shims. When you reinstall the nuts on the screed plate studs, you should use 5P-3931 Anti-Seize Compound . Screed plate stud nuts should be torqued to 105 N·m (77 lb ft).

Reinstalling and Adjusting Extender Nose Bars

Illustration 42	g00704603

1. Tap the holes in the new nose bars. Clean the tapped holes and clean the studs with thread cleaner. Apply 4C-9507 Compound or Loctite 272 to the threads of the studs. Torque the studs to 51 ± 3 N·m (37 ± 2 lb ft).

2. Install the nose bar to the extender screed frame. You should use the five nuts and the five washers that hold the nose bar to the frame. When you install the nose bar, you should use 5P-3931 Anti-Seize Compound on the nuts. On the 10-20B screed, you should install the seven nuts and you should install the seven washers that hold the nose bars to the extender frame.

3. You should use a scale or you should use calipers in order to verify the nose bar overhang. The nose bar or bars should be between 0 to 0.75 mm (0 to 0.030 inch) below the screed plate. If the nose bar or bars are above the screed plate, you can add shims between the nose bar or bars and the screed frame in order to bring the overhang to specifications.

4. Check the flatness of the nose bars with a straight edge or check the flatness of the nose bars with a stringline. The nose bars must be flat within 1.5 mm (0.060 inch). You can use shims in order to adjust the nose bars.

   Note: After you shim the nose bars, you should verify that no portion of the nose bars overhang the screed plate by more than 0.75 mm (0.030 inch). Replace the nose bars if excessive overhang is created.

Leveling the Trailing Edge of the Extender Plate

Illustration 43	g00704612

1. Adjust the inside adjusters and adjust the outermost adjusters until there is a 9.525 mm (0.3750 inch) gap between the screed plate spacer bar and the welded nuts on the bottom of the extender frames. Torque the two adjuster nuts to 105 N·m (77 lb ft).

   Note: When you have adjusted the two adjusters to a 9.525 mm (0.3750 inch) gap, do not readjust the adjusters. All remaining adjustments must be made with the remaining adjusters.

Show/hide table



Illustration 44	g00704617

2. Place a straightedge or place a stringline on the trailing edge of the screed. Check the flatness of the screed plate by measuring the gap between the screed plate and the measuring device.

3. If the trailing edge is not within 0.762 mm (0.0300 inch) of being flat, loosen the remaining nuts and use the screed plate leveling adjusters in order to bring the screed plates in tolerance. One full turn of the hex nut will result in 2.1080 mm (0.0830 inch) of vertical motion. Torque the adjuster nuts to 105 N·m (77 lb ft).

4. Repeat the procedure for the other extender.

   Note: Refer to the following procedures: Specifications Systems Operation Testing and Adjusting, KENR2615, "Sloper Stop Adjustment", Specifications Systems Operation Testing and Adjusting, KENR2615, "Angle of Attack Adjustment", Specifications Systems Operation Testing and Adjusting, KENR2615, "Prestrikeoff Adjustments".

Adjust the Screed Plate for the Extenders

1. Determine if the nose plate leading edge and the screed plate leading edge elevation is parallel relative to the extension tubes.
   • This step determines whether the extender rises when the extender is moved inward.

   • This step determines whether the extender falls when the extender is moved inward.

   • This step determines whether the extender raises when the extender is moved outward.

   • This step determines whether the extender falls when the extender is moved outward.

2. Two methods can be used.
   • One method utilizes a magnetic dial indicator that is mounted to the main screed plate. The dial indicator is positioned 89 mm (3.5 inch) from the outside edge. The dial indicator is used to measure any deviation between the height of the front of the extender screed plate and the main screed. Measure any deviation when the extender is moved from the full in position to the full out position. The total indicator reading should be less than 1.5 mm (0.060 inch). If the difference between the extender nose bar and the main screed plate is greater than1.5 mm (0.060 inch), you might need to add shims to the extender nose bar and the extender screed plate. If the difference between the extender nose bar and the main screed plate is greater than1.5 mm (0.060 inch), you might need to add shims to the extender nose bar and the extender screed plate.

   • You can use a magnetic level or you can use a straight edge as a fixed reference in order to measure the deviation in elevation. The magnetic level or the straight edge should be positioned 89 mm (3.5 inch) from the outside edge of the main screed plate. The gap between the straight edge and the leading edge of the extender plate can be checked when the extender is moved from the full inposition to the full outposition.

3. The angle of attack can be checked and the angle of attack can be adjusted. Use a straight edge or use a magnetic level as a fixed reference located 89 mm (3.5 inch) from the outside edge of the main screed. The magnetic level will go back under the extender plate. You should move the extender until the outermost inboard trailing edge adjuster lines up with a straight edge or a magnetic level. The height of the adjuster must be adjusted so that there is a 3.1 mm (0.125 inch) gap from the fixed reference to the extender nose bar. The inboard trailing edge adjuster must be adjusted so that the trailing edge of the screed plate contacts the fixed reference. The fixed reference is the straight edge or the magnetic level. Move the extender inward. The outside trailing edge adjuster must be aligned with a fixed reference. You must adjust the trailing edge until the plate contacts the straight edge. You must adjust the trailing edge until the plate contacts the magnetic level. The angle of attack is now adjusted at both ends of the extender.

4. You must check the flatness of the trailing edge between the outboard trailing edge adjusters.

5. You must check the transverse flatness of the trailing edge between the inboard trailing edge adjusters.

6. You must adjust the transverse flatness of the trailing edge between the outboard trailing edge adjusters.

7. You must adjust the transverse flatness of the trailing edge between the inboard trailing edge adjusters.

Reassembly of Deflectors, Side Covers and Splice Plate

Show/hide table



Illustration 45	g00704663

1. Reinstall the extender deflector plate by installing the four allen head screws that hold the extender deflector to the frame.

   Note: Repeat the first step for both extenders.

Show/hide table



Illustration 46	g00704667

2. Reinstall the right hand main deflector plate. Reinstall the left hand main deflector plate. On the 8-16B screed, reinstall the 16 nuts and reinstall the 16 washers that hold the deflector plates to the main frame. On the 10-20B screed, reinstall 20 nuts and reinstall 20 washers.

Show/hide table



Illustration 47	g00704694

3. In order to reinstall the right side cover, install the three allen bolts on each side. In order to reinstall the left side cover, install the three allen bolts on each side.

Show/hide table



Illustration 48	g00704696

4. In order to reinstall the center splice plate, install the six nuts and install the six washers that hold the plate.