550E SCREED CROWN SETTING
1a. On a flat surface, find the null position of the screed depth handles by adjusting them until they
are free and not in tension.
1b. Run a string across the leading edge (front) of the main screed bottom, as close
as possible to the bullnose of the screed plate, and adjust the forward
ratchet jack until there is a slight gap (approximately ¼” – ⅜”)
between the screed plate and the string.
*String MUST be on the flat portion of the screed, not on the radius portion*
2. Place the string across the back of the main screed bottom, near the
trailing edge (rear) curvature of the screed plate, and adjust the rear ratchet jack until the
screed plate just touches the whole length of the string. Pull the string away, at one end, and bring it
back to verify that it contacts the entire length at the same time.
*String MUST be on the flat portion of the screed, not on the radius portion*
3. Place the string across the front of the screed bottom and double check the gap between the
screed bottom and the string. Re-adjust the forward ratchet jack as necessary to obtain the ¼” – ⅜”
gap between the string and screed plate.
4. Place the string across the rear of the screed bottom and double check
the gap between the screed bottom and the string. Re-adjust the rear ratchet
jack as necessary to verify the screed plate just touches the whole length of the string.
5. Repeat steps 3 and 4 until no adjustment is required.
550E EXTENSION SETTING
6. Run Extensions all the way out.
7. Loosen strike-off bolts and raise and raise strike-offs all the way up and “hand tighten” bolts.
8. Position extensions so they are at 1’ out on each side (paving width of 10’).
9. Lower screed onto four 24” long 2X4 boards. Lower screed so that the inside edge and outside
edge of each extension are resting on the boards.
10. Null the screed by rotating the cranks until you locate the position of free movement. This is a
limited area where the depth cranks will both rotate freely in either direction. This is the nulled
position. Then, rotate thickness screws 1 ½ rotations, (in the thicker direction).
11. Completely loosen the extension strike-off bolts so that the strike-offs freely rest on the setting
boards.
12. Use wrench to tighten strike-off bolts completely.
13. Start paving and make adjustments as required.
