SUNWARD SWDM40 - Kelly Disassembly

SWDM40 OPERATION & MAINTENANCE MANUAL
140
Causes of Followed Kelly：
1. Kelly bend caused by various reasons.
2. Inclined piling hole
3. Tiny sediment in the Kelly
4. Collision of edge curl in the Kelly and inner wall of steel pipe
5. Lift before confirmation of complete unlocking and no continuous anticlockwise rotation
during lifting
Lift while keeping rotation anticlockwise: While lifting, negative pressure is easy to form on the
hole bottom or drill bucket collides with the hole wall, thus, causing Kelly rotates clockwise at
small extent. If it’s right on the pressure area, the inclined key bar will be withstood by the drive
sleeve inner spline and leading to Kelly lifted in advance.
7.1.4 Kelly Disassembly
Disassembly：
1. Place the Kelly on the crosstie.
2. Remove bolts on the clamp plate, separate the plate and pull out the core pin set ring, clean
out small parts, such as nut spacer, don’t leave them in the Kelly.
3. Insert a pin shaft ( diameter 25) into the Kelly drive sleeve and fix the 1
st
, 2
nd
and 3
rd
section
Kelly.
4. Reeve wire rope through Kelly square head and install bucket teeth on two ends of the rope.
5. Travel excavator rearward to pull out the core bar.
6. Withstand the 3
rd
drive sleeve with one end of a rebar, and the other end is withstood by the
excavator, and then push the 3
rd
section of Kelly for half a meter to one meter with the bucket.
7. Twine the set ring with a cotton tape and drag out with the excavator.
8. Use above same procedures for the 2
nd
section.
9. Don’t place the parts of Kelly freely after disassembly to avoid damaged or buried while
taking out.