Numa Patriot 125 Maintenance manual

CARE & MAINTENANCE
INSTRUCTIONS
©2023 Numa All Rights Reserved
P.O. Box 348 •646 Thompson Road •Thompson, CT 06277 USA
US Toll Free: (800) 356-NUMA •Tel: [phone] •Fax: [phone]
E-mail: [email protected]
Website: www.numahammers.com
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Patriot
125/125HD

Patriot

125/125HD
TABLE OF CONTENTS
Page
Section I Description ............................................................................1
Functional Description ....................................................................2
1. Backhead ...............................................................................2
2. Pin ............................................................................................2
3. Check Valve - Aluminum .....................................................2
4. Check Valve Spring...............................................................2
5. Feed Tube ...............................................................................2
6. Choke .....................................................................................2
7. Piston .......................................................................................2
8. Case ........................................................................................3
9. Snap Ring ...............................................................................3
10. Bit Bearing...............................................................................3
11. Bit Bearing Bushing (HD model only) ...................................3
12. Bit Bearing Retainer................................................................3
13. Bit Retaining Rings..................................................................3
14. Thrust Washers - Brass............................................................3
15. Chuck......................................................................................4
16. Chuck Bushing .......................................................................4
17. Drive Plates .............................................................................4
Section II Maintenance........................................................................5
Disassembly .....................................................................................5
Inspection.........................................................................................8
General Assembly.........................................................................11
Hammer Assembly ........................................................................11
Backhead / Feed Tube Assembly ...............................................12
Section III Parts Identication ..........................................................14
Patriot 125/125HD Exploded View ...............................................14
Part Number Reference ................................................................14
Section IV Air Consumption Chart.................................................15
Section V Lubrication..........................................................................16
Section VI Storage................................................................................17
Short Term.......................................................................................17
Long Term .......................................................................................17
Restarting........................................................................................18
Section VII Button Bit Maintenance ..............................................19
General...........................................................................................19
Sharpening .....................................................................................19
Section VIII Patriot 125/125HD Recommended Spares........20

04/23/10
WARRANTIES AND REMEDIES
LIMITED WARRANTY
Numa warrants that the Product will be new and free from defects in material and workmanship
under normal use as contemplated by this Contract for a period of six (6) months from the date of
shipment.
Except for the foregoing warranty, Numa disclaims all warranties and representations wherever
made, including warranties of merchantability, durability, length of service, or tness for a particular
purpose.
Any alteration or modication of the original product without the express written consent of
Numa will void this warranty.
REMEDY
If, during such warranty period, Buyer promptly noties Numa in writing of any defect and
establishes that the above warranty is not met, Numa shall either repair or replace the Product or
credit the customer, as it deems necessary to meet the warranty.
Such repair, replacement, or credit of Product shall constitute complete fulllment of Numa's
obligation under this warranty, and upon the expiration of the original warranty period, all of Numa's
obligations hereunder shall terminate.
LIMITATION OF LIABILITY
Numa shall not be liable to Buyer whether in contract, in tort (including negligence and strict
liability), under any warranty or otherwise, for any special, indirect, incidental or consequential loss
or damage whatsoever, including (without limitation) loss arising from delay, cost or capital and loss
of prots or revenues. The remedies set forth in this Contract are exclusive, and the total cumulative
liability of Numa under this Contract or for any act or omission in connection therewith or related
thereto, whether in contract, in tort (including negligence and strict liability), under any warranty or
otherwise, is limited to the price paid by Buyer for the Product.
The WARNINGS, CAUTIONS and NOTES used throughout the text of this
instruction book are dened as follows:
WARNING A specic procedure or practice that must be strictly followed,
or a specic condition that must be met, to prevent possible
bodily harm.
CAUTION A specic procedure or practice that must be strictly followed,
or a specic condition that must be met, to prevent damage
to the equipment.
NOTE Important supplemental information.
Numa®,Champion, and Patriot
are registered trademarks of Numa.

02/09/23 Page 1
Patriot

125/125HD
SECTION I
DESCRIPTION
GENERAL DESCRIPTION
The Patriot 125/125HD is a valveless, pneumatically operated tool designed to utilize
Numa 12-1/4" to 20" (311 mm to 508 mm) diameter bits in rock formations under a wide range
of operating conditions. The Patriot 125HD utilizes bits from 13" to 20" (331 mm to 508 mm).
The Patriot 125/125HD hammer design incorporates a non-reversible, hardened case.
The single bore design allows for a maximum bore diameter in conjunction with optimum
life against abrasion. The simple design of the Patriot 125/125HD provides performance and
dependability without sacricing tool life.
The Patriot 125/125HD is designed for universal applications using air pressure from 150
PSI to 250 PSI (10.2 Bar to 17.0 Bar) with compressors having capacities of 1300 CFM (614 Litres/
Second) or more. When drilling conditions require supplementary hole cleaning, additional
hole cleaning air can be passed through the hammer by utilizing an interchangeable choke.
All standard hammers shipped from Numa have a blank choke installed. Refer to page 15
for correct choke selection and pages 7 and 12 to facilitate the removal and the installation
of the choke.
Patriot 125/125HD
Weight w/o Bit: P125 1133 lbs. (514 kg)
P125HD 1360 lbs. (618 kg)
Outside Diameter: P125 10-3/4" (273 mm)
P125HD 11-3/4" (298 mm)
Hammer Length:
Shoulder to Shoulder 66-3/4" (170 cm)
Shoulder to Bit Face 75-3/4" (192 cm)
Backhead API Thread 6-5/8 API REG
Table 1-1 General Hammer Specications
12-1/4" (311 mm) 433 lbs. (197 kg) 16" (406 mm) 581 lbs. (264 kg)
12-3/8" (314 mm) 437 lbs. (199 kg) 17-1/2" (445 mm) 619 lbs. (281 kg)
13" (330 mm) 450 lbs. (204 kg) 18" (457 mm) 646 lbs. (293 kg)
14" (356 mm) 509 lbs. (231 kg) 19" (483 mm) 781 lbs. (354 kg)
15" (381 mm) 533 lbs. (242 kg) 20" (508 mm) 833 lbs. (378 kg)
Table 1-2 General Bit Specications
NOTE
Numa 12-1/4" to 20" (311 mm to 508 mm) bits are available in concave face
design with large air ushing holes and chip ways to take advantage of the
Patriot 125/125HD performance. Other sizes may be available upon request.

Page 2 02/09/23
Patriot

125/125HD
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 ats 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 t. A set of three chokes is supplied with each hammer. By installing the
correct choke, the hammer can be ne 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, controlling 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.

02/09/23 Page 3
Patriot

125/125HD
8. CASE
The case is designed to contain the internal parts which make up the hammer
assembly. The case is non-reversible and hardened to resist wear and to extend life in
abrasive conditions. A 11-3/4" (298 mm) OD HD case is also available as an optional
extra.
9. SNAP RING
A snap ring positions the internal parts in the hammer and prevents the piston from
falling out when the chuck, bit retaining rings, bit bearing and bit are removed.
10. BIT BEARING
The bit bearing guides the bit to insure proper alignment between the piston and the
bit. The bit bearing is placed into the chuck end of the case and is located by a
snap ring which is inserted into the main bore. The HD model only has a bit bearing
designed for a bit bearing bushing.
11. BIT BEARING BUSHING (HD model only)
The bit bearing bushing is a nylon insert located in the bit bearing to provide a bearing
surface between the upper bit shank and bit bearing.
12. BIT BEARING RETAINER
The bit bearing retainer sits in a groove in the case and retains the bit bearing.
13. BIT RETAINING RINGS
The bit retaining rings are designed to allow the bit to move between the drilling and
cleaning positions and prevent the bit from coming completely out of the hammer.
The bit retaining rings consist of two matched halves and are held together with the
bit retaining ring o-ring.
14. THRUST WASHERS - BRASS
Two brass thrust washers, one located between the backhead and the case and one
between the chuck and the case, provide for easy disassembly.

Page 4 02/09/23
Patriot

125/125HD
15. CHUCK
The chuck threads into the bottom end of the case. It has internal splines that mesh
with the splines on the bit body to transmit rotation. A 11-3/4" (298 mm) HD chuck is
available as an optional extra.
16. CHUCK BUSHING
The chuck bushing is a nylon insert located in the bottom end of the chuck to provide
a bearing surface between the lower bit shank and chuck.
17. DRIVE PLATES
The plastic drive plates provide wear protection for the splines. They are inserted
between the chuck and the bit. A complete drive plate set is provided with each bit.

02/09/23 Page 5
Patriot

125/125HD
SECTION II
MAINTENANCE
DISASSEMBLY
•If at all possible, the backhead and chuck should be broken loose on the drill rig; this
is much easier than trying to do so after the drill has been removed from the drill rig.
CAUTION
USE CAUTION WHEN HANDLING DOWN THE HOLE HAMMER PARTS. NUMA HAMMER
PARTS ARE MANUFACTURED FROM HARDENED, HEAT TREATED MATERIALS. DROPPING
OR STRIKING THESE PARTS MAY CAUSE SEVERE DAMAGE. STRIKING THE HAMMER
PARTS WITH HAMMERS, CROWBARS OR LIKE INSTRUMENTS WILL VOID THE WARRANTY.
•Maintenance should be performed in a clean environment.
• Tools needed: appropriate hammer lifting device, a hammer stand, chain vise, 2" (51
mm) diameter brass rod, a press, a drift pin and a small screwdriver.
•Clean the outside of the hammer. This will insure a good surface to clamp on.
•With the hammer standing in the vertical postition, using an appropriate lifting device,
unscrew and remove the chuck/bit assembly from the case.
•Remove the bit retaining rings from around the bit.
•Remove the bit retaining rings from around the bit.
•Remove the o-ring from the bit retaining rings.
•Remove the drive plates from the bit and chuck splines.
•Remove the brass thrust washer from the chuck.
•Using an appropriate lifting device, unscrew and remove the backhead/feed tube
assembly from the case.
•Place the hammer horizontally on a hammer stand and secure the hammer with a
chain vise.

Page 6 02/09/23
Patriot

125/125HD
CAUTION
THE ACCEPTABLE CLAMPING AREAS START 8" (203 MM) FROM EITHER CASE END, TO
AN ADDITIONAL 5" (127 MM) BEYOND THIS POINT. PLACING THE CHAIN VISE ON
THE AREA OF THE CASE WHERE THE PISTON CYCLES CAN DISTORT THE CASE, RESTRICT
PISTON MOVEMENT AND VOID THE WARRANTY.
•With the case in a horizontal position and using a 2" (51 mm) diameter brass rod, slide
the piston out of the backhead end of the case.
•Removal of the chuck bushing is not necessary for routine maintenance. If necessary,
lay the chuck on its side so that the bit end is facing you. Locate the seam in the
chuck bushing. Insert a screwdriver into the slot in the middle of the seam and pry
the chuck bushing from the under cut. Remove the chuck bushing from the bit end
of the chuck.
•Removal of the bit bearing, bit bearing bushing (in HD model only), and snap ring from
the chuck end of the case is not necessary for routine maintenance. If necessary,
use a small screw driver or similar device to pick out the bit bearing retainer from the
groove. Insert the bit bearing press plate into the backhead end of the case with the
small diameter toward the chuck end. Using a 2" (51 mm) diameter brass rod, slide
the bit bearing press plate to the chuck end of the case until it rests against the bit
bearing. Remove the brass rod. Using a press, apply pressure to the bit bearing press
plate and force the bit bearing and snap ring out of the chuck end of the case. Use
a small screw driver or similar device to pick out the bit bearing bushing from the I.D.
of the bit bearing.
P125/P125HD Bearing Spacer/Press Plate
Figure 2-1
4 3/44 3/4
1 1/21 1/2
2 1/42 1/4
3 1/43 1/4
7 1/27 1/28 3/88 3/89 1/89 1/8
1/8R TYP1/8R TYP
1/8 X 45°1/8 X 45°