Drilling rock is a very difficult process and during drilling some problems with hammers might be faced. In order to avoid such problem the following precautions are taken
Compressor Output is Checked for
Temperature & altitude are adjusted
Air pressure is checked with pressure gauge
Air filters are checked
Minimum Level of rock oil is maintained
Drill Rods are Checked for
Air leakage’s throughout
Pressure loss in hose
Weight on bit is checked for
Feed cylinder dropping
Proper rotation & feed
Control tube is checked for
Correct diameter and height
Chips at internal diameter
Burrs on outer diameter
Check valve is checked for
Proper seating
Level of rig is checked for
Level jacks leakage
Hydraulic pressure dropping at valve end
Problem
Cause
Solution
Thread Locking
Insufficient Lubrication
Use proper amount &type of thread lubricants
Damaged thread
Thread breakage
Improper or damaged mating parts
Check the mating parts with api thread gauge
Threads rust
Maintain Proper Rust Preventive Oil
Operated with damaged threads
Check the mating parts
Outer Diameter Body
Wear Out
Abrasive formation
Increase hole cleaning
Avoid the wear out bits
Body cut
Damaged threads
Remove the threads burrs
Hammer Case
Problem
Cause
Solution
Thread locking
Insufficient lubrication
Use proper amount & type of thread lubricants.
Thread breakage/Crack
Improper or damaged mating
parts Denting at hammer case
Check the mating parts with API thread gauge
Open proper breakout tools
Do not open with heat & hit
Threads rust
Maintain proper rust prevent oil
Operated with damaged threads
Check the mating parts
Od Body Wear Out
Abrasive formation
Increase hole cleaning
Avoid the wear out bits
Body Cut
Damaged threads
Remove the threads burs
To check control tube seating face perpendicular to honing bore in hammer case
Crack at Front Chuck End
Case worn below acceptable limit
Use new bit
Replace hammer case
Id Wear Out
Insufficient lubrication
Use proper amount & type of lubricants
To check compressor filter
To clean hammer case before assy
To check control tube id
To check coupler id
To check drill rods id
Cap drill rods after use
Foreign material contamination
Check Valve
Problem
Cause
Solution
Not sealing
Worn or cut seal surface
(Spring tension may less)
