SUNWARD SWDM240B - Checking Slewing Bearing Junction Bolts; Checking Bolts Tightening for Key Parts of Rotary Head; Checking and Changing Drive Key Bar for Kelly

SWDM240B OPERATION & MAINTENANCE MANUAL
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7.5.2 Checking Slewing Bearing Junction Bolts
●Slewing bearing junction bolts are applied with anti-loose glue. Normally, no need to tight up,
visual inspection is enough.
●Bolts with looseness, crack or defects, should be changed. If there’s one loosened, broken or
defective slewing bearing bolt, two bolts on both left and right side should be changed
simultaneously.
● Anti-loose glue should be applied under the surface of lower part of new bolt head.
7.5.3 Checking Bolts Tightening for Key Parts of Rotary Head
Clean rotary head with clean water after work to avoid the damage of inner oil seal and other
parts caused by debris or mud attaching on the rotary head and penetrating into the internal with
the rotation, and shorten the service lift of rotary head.
Check bolt and pin shaft for looseness at initial 10 hours and after that every 50 hours.
Note：
 Risk of damaging rotary head!
 Don’t unscrew these bolts unless necessary, failure to comply may result in bolt
looseness caused by seal glue breakage during operation. Visual inspection is enough.
 Visually check cushion device mounting bolts for secure and tank cover mounting
bolts.
 Unscrew loosened mounting bolts, apply thread glue onto changed bolt thread and
then tighten with specified torque.
 Check rotary head housing for bolt breakage when replacing oil.
7.5.4 Checking and Changing Drive Key Bar for Kelly
Note：Check rotary head key bar for loose and damage every 50 hours.
1）Clean drive key bar to avoid mud attaching on it and weaken use performance.
2）Check Kelly drive key bar for abrasion.
3）If abrasion exceeds 8mm, change Kelly drive key bar with a new one. Any abrasion is found,
briquetting block and mounting bolts should be changed together.