SWDM40 OPERATION & MAINTENANCE MANUAL
groove to avoid interference.
Positioning ring repair:
1. Do gas-cutting for the positioning ring, and remove the damaged part without breaking the
steel pipe and polish it to shine.
2. If it’s a structure of two positioning rings, do ring gas-cutting on the steel pipe between two
rings, and then install the new positioning ring.
3. Mount the new part, don’t weld the O-ring, which is a movable part, weld the kidney slot of
the positioning ring together with the other side.
4. If the steel pipe has been cut with gas, it should be weld together again for the same axial less
than 1.5mm.
Repair for the crack of Kelly center pressurized block or inclined plate:
1. Find the crack position to determine whether the steel pipe body is damaged.
2. If the crack doesn’t damage the pipe body, change or weld on the spline or pressurized block
directly.
3. If the crack damage the pipe body but the distance is not over than 1/5 circle, the operation
should be done skillful professional personnel. Figure out the crack source on two ends,
eliminate the crack source completely, repair the crack into a V-shaped groove, and then weld it
again and polish the surface.
4. The middle part of steel pipe and accessories should be changed if the crack is too long, cut
the damaged part with gas and weld it.
Repair of Kelly Drive Sleeve
1.If the end surface is uneven, rub it down to flat.
2. If then end surface is too rough, cut it with gas into a plane, open a ring groove, and then
weld it with a special part for drive sleeve end surface.
3. Change the drive sleeve and arc plate spline if it’s damaged severely.
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