20 MHP Operating & Maintenance Manual
1. Obtain the proper Swift-Lock tooth template. Refer to the parts manual for template part numbers.
2. Throughly clean the area to be build up. Grind off any existing hard-surface material.
3.
Preheat the area to 200° F (93.3° C) to remove moisture.
4.
Preheat the area to be build up to 300° - 400° F (149° - 204° C)
Note: Do not exceed 450° F (232° C).
5.
Use the tooth template to determine how much buildup is required.
6.
Using AWS E7018 welding rod, make hard surface beads, as shown in Figure 25.
7. Relieve stress and remove slag after each pass by peening vigorously with an air operated slag peener.
8. Repeat steps 6 and 7 until the tooth profile matches the build up template.
9. Grind edges square to match the template.
10.
Using AWS E7018, place underlayment passes, as shown in Figure 25.
11.
Apply a bead of Amalloy 814H rod on top of each of the underlayment beads.
Note: Do NOT apply Amalloy 814H to the base metal.
12.
Relieve stress after each pass by peening vigorously with an air operated slag peener.
13. Taper the end of each hard-surface bead by grinding.
Note: Do NOT undercut the weld.
14. When grinding is complete, peen the area until it is shiny or until the peener cannot dent the weld.
Note: About 5-10 minutes.
15. Cover the welded area with a heat blanket and allow to cool slowly.
MAINTENANCE
SWIFT-LOCK TEETH / LOWER TOOTH PLATEN BUILD UP
SWIFT-LOCK TOOTH & LOWER TOOTH PLATEN BUILD-UP
Figure 25
BUILD-UP TEMPLATE
HARD-SURFACE BEADS
0.50” (13 MM)
