8-6
Safety, Operation and Maintenance Manual-September 30, 2019
Category Failure analysis
Other common
misoperation
Kelly bar kinks or cracks due to pulling heavy load.
When installing Kelly bar, main winch lifting and rig travelling coordinates not
so well that Kelly guide collides with crowd cylinder and cylinder damages.
The boom is so high and backward when drilling that the drilling bucket
touches crawler when swinging and dumping soil.
Travel reducer is too heated and damaged because of traveling too long one
time.
Rotary drive rotation speed is too fast when drilling the floating rock. The
sudden resistance when hitting the floating rock results in square head
cracking.
When operating with lockout rod, the rod is locked and the rod may smash
rotary drive reducer and rotary drive oil seal (or even smash the cylinder
connecting rotary drive or wire rope, causing fall of rotary drive).
The operator uses auxiliary laterally, which causes wire rope slipping from
pulley.
Releasing rope so fast that the rope breaks or damages.
Releasing auxiliary rope so loose when lowering mast that cab roof steel
frame is scraped when raising the boom, or even the screws are torn.
The mast presses the wire rope into the mast holder when lowering the mast.
The wire rope damages.
After dumping soil, the Kelly bar is lowered directly without swing returning to
zero, which will cause larger borehole , more concrete and slip of casing.
When the engine output power is large, shut down the engine, and it may
shorten the life of turbocharger and engine.
The engine output power is large without heating the engine (especially when
the temperature is too low).
Welding the drilling tool without removing it. The electricity of the rig is not
switched off and harness or controller is damaged.
When removing the Kelly bar, swing to lower the Kelly bar. The wire rope and
mast is not parallel.
When operating the rig, answering telephone and chatting with people will
cause misoperation.
NOTE：
The table above is only for reference. If you have any questions, please feel free to contact
SANY after sales department.
Appendix SR400R Rotary Drilling Rig
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