Schramm 500 Series Maintenance Manual

HAMMER MAINTENANCE
Service Kit (O-Ring Kit)
•
All new SH&B RC hammers are ready to operate upon delivery
•
It is recommended to have a rubber service kit on hand whenever dismantling hammers.
•
Deterioration of rubber parts will occur if the hammer is overheated. This may be due to
poor lubrication or when the hammer has been bogged. If this occurs, the hammer
should be stripped down for inspection. If the rubber components show any
deterioration they should be replaced. Under normal working conditions the rubber
components of a hammer should last 4000 m. It is recommended to service all
hammers after 4000 m. All internal parts should be checked and all rubber parts
replaced.
Certain operating conditions will require more frequent servicing:
•
Operating above 500 psi
•
Extremely hard ground conditions
•
Corrosive ground water conditions
Hammer Dissemble
500 Series
If possible, break the thread joints on the Drill Rig, otherwise use a hydraulic breakout bench.
Disassemble the hammer with the hammer lying horizontal if possible
Remove the Circlip that holds the Adaptor Nozzle.
1.
Remove the Adaptor Nozzle and the Inner Tube Together.
2.
Remove the Drive Sub, Percussion Bit and Bit Retainer Rings.
3.
Push the Piston Bearing Bush up the hammer to clear the Piston Retainer Ring.
4.
Remove the Piston Retaining Ring. A small tool with a pointed end can be used to pry
5.
the retaining ring from the groove. Slide the tool into the relief groove and flick the
retainer ring into the piston case. Care should be taken not to scratch the piston Case.
Slide the Piston Bearing Bush out of the hammer.
6.
Slide the Piston out of the bottom end of the hammer.
7.
Unscrew the Top Cylinder from the Piston case.
8.
By turning the Top Cylinder upside down the Check Valve and spring should fall out.
9.