Table of Contents
Advertisement
FUNCTIONAL DESCRIPTION
1.
BACKHEAD
The backhead connects the hammer to the drill rod. It is threaded into the top end of
the case with single start threads and into the drill rod with a standard 6-5/8" API REG
thread. Wrench flats are provided for disassembling. A 11-3/4" (298 mm) HD backhead
is available as an optional extra.
2.
PIN
The pin connects and aligns the feed tube assembly into the backhead. It is made
of hardened steel to insure long life.
3.
CHECK VALVE - ALUMINUM
The aluminum check valve maintains pressure in the hammer when the air supply has
been shut off. The pressure in the hammer balances the hydrostatic pressure in the
hole thereby preventing contaminants from entering the hammer.
4.
CHECK VALVE SPRING
The check valve spring provides tension under the check valve to keep it closed. It
is compressed as the air is turned on.
5.
FEED TUBE
The feed tube supplies the main air into the chambers located in the piston. It is
located in the backhead and held in place by a pin.
6.
CHOKE
The interchangeable choke is located in the tip of the feed tube and is held in place
with a press fit. A set of three chokes is supplied with each hammer. By installing the
correct choke, the hammer can be fine tuned to the compressor package. A hammer
with a plastic feed tube does not utilize a choke. A hole can be drilled in the bottom
tip of the plastic feed tube to facilitate hole cleaning, or pressure control. Use the chart
located on page 15 for proper hole size.
7.
PISTON
The piston functions as the only moving part in the hammer, control ling the operational
air cycle. The percussive action of the piston striking the bit transfers the energy
through the bit in order to fracture rock formations. A snap ring inserted in the main
bore prevents the piston from sliding out of the case when the chuck, bit, bit retaining
rings and bit bearing are removed.
Page 2
Patriot
125/125HD
02/09/23
Advertisement
Table of Contents
