- 45 -
7.9. Replacing the through bolts
The through bolts connect and retaining the body sections of the hydraulic hammer.
The through bolts for PRB008 ~ PRB150 models are directly assembled directly into the female threads
in the front-head.
The through bolts for PRB170 ~ PRB700 models use the separate nuts (the front-head nuts) at the front-
head.
The through bolts can be checked visually, once the sealing plugs in the inspection holes in the top of the
bracket have been removed.
If the through bolts get loose or damaged during operation, stop hammer work. And, repairs must be done
immediately in the following manner:
1. Place the hammer on flat and firm ground. Separate the power-cell of the hammer from the bracket.
2. Discharge the nitrogen gas from the back-head completely.
3. Remove all the through bolts, and inspect for the presence of any cracks at the threads and the shank of
the bolts.
4. Always apply thread paste, made of molybdenum disulphide (MoS2), to the threads of the through bolts
before installing.
5. At first, tighten the entire bolts to the
half of the specified torque
in diagonal pattern.
6. Tighten the bolts to the specified torque in diagonal pattern.
7. Repeat 1~2 times in the same way.
7.10. Checking the bottom of the piston
CAUTION!
Be sure to turn off the power switch of the carrier and to shut off the stop valves before
checking the bottom of the piston. Never insert hands into the front-head. Check only by
sight.
Check the bottom of the piston, which impact the chisel directly, every week, at least every 50 hours or
whenever the chisel is changed. Check the impact surfaces of the piston for wear, sinking or cracking.
If the hammer is continuously used once the bottom of the piston has any failure or crack, the hammer can
be seriously damaged.
Permissible dent depth:
PRB008 ~ PRB150: less than 1mm
PRB170 ~ PRB700: less than 2mm
Any modification such as re-machining, welding or heat treatment is not allowed.
Use only genuine replacement parts, or it may invalidate the warranty.
To Next Page
Loading...