Numa Patriot RC50 Maintenance manual

MANUFACTURER OF DOWN HOLE HAMMERS AND BITS
©2020 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
Patents 4,530,408 4,919,221 4,962,822 5,205,363 5,984,021 5,992,537 6,021,856 7,422,074
PatriotRC50
CARE & MAINTENANCE
INSTRUCTIONS

Patriot®RC50
TABLE OF CONTENTS Page
Section I Description ..................................................................... 1
Functional Description ............................................................. 2
1. Connector Tube .............................................................. 2
2. Collection Tube ............................................................... 2
3. Backhead ........................................................................ 2
4. Pin ..................................................................................... 2
5. Backhead Bearing.......................................................... 2
6. Check Valve Seat........................................................... 2
7. Check Valve ................................................................... 2
8. Check Valve Spring ....................................................... 2
9. Feed Tube ........................................................................ 3
10. Piston ................................................................................ 3
11. Case ................................................................................. 3
12. Snap Ring......................................................................... 3
13. Bit Bearing........................................................................ 3
14. Bit Retaining Rings........................................................... 3
15. Chuck............................................................................... 3
16. Metering Sleeve .............................................................. 3
Section II Maintenance......................................................................... 4
Disassembly .............................................................................. 4
Hammer Disassembly .............................................................. 4
Inspection.................................................................................. 6
General Hammer Assembly.................................................... 9
Hammer Assembly ................................................................... 9
Section III Parts Identication ............................................................. 12
Patriot RC50 Exploded View .................................................. 12
Part Number Reference ......................................................... 12
Section IV Air Consumption Charts ................................................... 13
Section V Lubrication .......................................................................... 14
Section VI Storage............................................................................... 15
Short Term................................................................................ 15
Long Term ................................................................................ 15
Restarting................................................................................. 16
Section VII Button Bit Maintenance ................................................... 17
General.................................................................................... 17
Sharpening .............................................................................. 17
Section VIII Patriot RC50 Recommended Spares............................. 18

04/23/10
MANUFACTURER OF DOWN HOLE HAMMERS AND BITS
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.

11/06/20 Page 1
Patriot®RC50
SECTION I
DESCRIPTION
GENERAL DESCRIPTION
The Patriot RC50 is a valveless, pneumatically operated reverse circulation drill designed
to utilize Numa 5-1/4" to 5-3/4" (133 mm to 146 mm) diameter reverse circulation bits in a
wide range of rock sampling applications.
The Patriot RC50 hammer design incorporates a hardened reversible case and a large
diameter collection tube. Backheads having threads compatible with the major reverse
circulation drill rods are available for the Patriot RC50. The large bore design of the Patriot
RC50 provides uncontaminated rock sampling without sacricing the high performance levels
associated with Numa down hole hammers.
The Patriot RC50 was specically designed to provide maximum performance on the
drill rigs most commonly used in rock sampling applications. The Patriot RC50 hammer
is designed to operate using air pressure from 150 PSI to 500 PSI (10.2 Bar to 34.5 Bar) with
compressors ranging in size from 425 CFM to 1050 CFM (201 to 496 Litres/Second). When
drilling conditions require supplementary hole cleaning, additional hole cleaning air can be
passed through the feed tube by removing the o-rings from the end of the feed tube which
seals on the collection tube. Refer to page 13 for the air consumption charts and pages 5
and 9 to facilitate the removal and installation of the o-rings.
Patriot RC50
Weight w/o Bit: 156 lbs. (71 kg)
Outside Diameter: 4-7/8" (124 mm)
Hammer Length:
Shoulder to Shoulder 41-13/16" (106 cm)
Shoulder to Bit Face 46-15/16" (119 cm)
Backhead API Thread Available for Reverse Circulation
4-1/2 OD Drill Rod
Table 1-1 General Hammer Specications
5-1/4" (133 mm) 33 lbs. (14.9 kg) 5-5/8" (143 mm) 34 lbs. (15.4 kg)
5-3/8" (137 mm) 33 lbs. (15.0 kg) 5-3/4" (146 mm) 35 lbs. (15.8 kg)
5-1/2" (140 mm) 34 lbs. (15.2 kg)
Table 1-2 General Bit Specications
NOTE
NUMA 5-1/4" TO 5-3/4" (133 MM TO 146 MM) BITS ARE AVAILABLE IN A
REVOLUTIONARY CONCAVE FACE DESIGN TO TAKE ADVANTAGE OF THE PATRIOT
RC50 PERFORMANCE. OTHER SIZES MAY BE AVAILABLE UPON REQUEST.

Page 2 11/06/20
Patriot®RC50
FUNCTIONAL DESCRIPTION
1. CONNECTOR TUBE
The connector tube ts in the backhead and on top of the collection tube to connect
the drill to those reverse circulation drills rods that use connector tubes.
2. COLLECTION TUBE
The collection tube extends from the check valve seat to the bit and transfers the
collected formation sample to the inner drill pipe of the reverse circulation drill rod.
The collection tube is designed to be easily replaced.
3. BACKHEAD
The backhead connects the hammer to the drill rod. Standard backheads are
available with threads that are compatible with most 4-1/2 reverse circulation drill
rod. Wrench ats are provided for disassembling.
4. PIN
Two pins align the feed tube into the backhead. They are made of hardened steel to
ensure long life.
5. BACKHEAD BEARING
The backhead bearing alligns and seals the backhead into the case bore.
6. CHECK VALVE SEAT
The check valve seat provides the sealing surface for the check valve and is located
in the backhead. The check valve seat locates the collection tube in the proper area.
7. CHECK VALVE
The 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.
8. 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.

11/06/20 Page 3
Patriot®RC50
9. FEED TUBE
The feed tube supplies the main air into the chambers located in the piston. It is
connected to the backhead by two pins. The feed tube is designed with a long
bearing surface to maintain alignment in the backhead.
10. 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.
11. CASE
The case is designed to contain the internal parts which make up the hammer
assembly. The case is reversible and hardened to resist wear and to extend life in
abrasive conditions.
12. 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 and bit are removed.
13. BIT BEARING
The bit bearing guides the bit to insure proper alignment between the piston and the
bit. The bit bearing is a slip t with a bit bearing retainer o-ring in the chuck end of the
case. The bit bearing is located by a snap ring which is inserted into the main bore.
14. 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.
15. CHUCK
The chuck threads into the bottom end of the case wit a large cross section thread
form. It has internal splines that mesh with the splines on the bit body to transmit
rotation. Wrench ats are provided for disassembling.
16. METERING SLEEVE (SOLD SEPARATELY)
The metering sleeve facilitates sample ow through the collection tube. It should
always be 1/8" (3 mm) smaller than bit diameter. The sleeve seats on a shoulder
located on the OD of the chuck.

Page 4 11/06/20
Patriot®RC50
SECTION II
MAINTENANCE
DISASSEMBLY
•If at all possible, the backhead and chuck / metering sleeve 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. The connector tube, if used, should be removed at this time. Cap
the backhead to reduce external contamination. Using a small screwdriver pick the
o-rings from the inside diameter of the small end of the connector tube.
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: overhead crane, hammer stand, chain vise, 2" (51 mm) diameter brass
rod, rubber mallet, snap ring pliers, press, a small screwdriver and a scribe.
•Clean the outside of the hammer. This will insure a good surface to clamp on.
•Using an overhead crane place the hammer horizontally on a hammer stand and
secure the hammer with a chain vise. Place the chain vise on the area of the case
where the bit bearing is housed when working on the chuck end of the hammer. When
working on the backhead end of the hammer, place the chain vise on the area of the
case where the backhead bearing is housed.
CAUTION
THE ACCEPTABLE CLAMPING AREAS START 4-1/2" (114 MM) FROM EITHER CASE END,
TO AN ADDITIONAL 2-1/2" (64 MM) BEYOND THIS POINT. PLACING THE CHAIN VISE
ON THE AREA OF THE CASE WHERE THE PISTON CYCLES OR ON THE THREADED AREAS
CAN DISTORT THE CASE AND THE CASE THREADS, RESTRICT PISTON MOVEMENT AND
VOID THE WARRANTY.
HAMMER DISASSEMBLY
•Break the bit and chuck loose from the case.
•Remove the bit, chuck and bit retaining rings from the case. Remove the metering
sleeve from the chuck.
•Using a small screwdriver, remove the o-ring from the chuck.

11/06/20 Page 5
Patriot®RC50
•Using a small screwdriver, remove the o-ring from the bit retaining rings.
•Break the backhead loose from the case.
•Remove the connector tube from the backhead. Use a small screwdriver to remove
the o-rings from the connector tube inside diamter.
•Using a rubber mallet, tap the bottom of the collection tube until it protrudes out the
backhead. Grab with both hands and remove.
•When the collection tube is removed, unscrew the backhead from the case.
CAUTION
REMOVING THE BACKHEAD ALSO REMOVES THE FEED TUBE, CHECK
VALVE SPRING, CHECK VALVE AND CHECK VALVE SEAT. TWO PINS
WITH A HOLE IN THE CENTER HOLD THESE PARTS IN THE BACKHEAD.
•To remove the feed tube, check valve spring, check valve and check valve seat
from the backhead, stand the backhead on the end so the feed tube is pointing up
and vertical. Place a scribe in the pin hole. While pushing the feed tube into the
backhead to relieve any force created by the check valve spring, wiggle the scribe
as you pull the pin from the backead. Repeat to remove other pin.
•Remove the check valve seat, check valve, check valve spring, and feed tube from
the backhead. Using a screwdriver, remove the backhead bearing from the groove
located on the outside diameter of the backhead. Remove the backhead o-ring from
the backhead.
•Using a small screwdriver, pick the feed tube o-ring from the outside diameter and
two collection tube o-ring rings from the inside diameter of the feed tube.
•Using a small screwdriver, pick the check valve seat o-ring from the outside diameter
and the collection tube o-ring form the inside diameter of the check valve seat.
•Using the 2" (51 mm) diameter brass rod from the chuck end of the case, push the
piston out of the backhead end of the case.
•Removal of the bit bearing and bottom end snap ring is not necessary for routine
maintenance. If necessary, use a small pick to remove the bit bearing retainer o-ring.
Using a long 2" (51 mm) diameter brass rod, go through the backhead end of the
case and tap the bit bearing out of the chuck end of the case. The bit bearing is a
slip t. To remove the snap ring, insert the piston into the backhead end of the case
with the serial numbers toward the snap ring. Using a 2" (51 mm) diameter brass rod,
tap on the piston until the snap ring comes out of the chuck end. Remove the piston
from the case.

Page 6 11/06/20
Patriot®RC50
INSPECTION
•All parts should be washed in a clean solvent before they are inspected and
reassembled.
WARNING
USE CLEANING FLUIDS THAT ARE NONFLAMMABLE AND AVOID
BREATHING THE FLUID VAPORS.
•Handle all parts carefully, hardened parts may chip if dropped on a hard surface.
COLLECTION TUBE
•Inspect the outside diameters for nicks, burrs and scoring.
•Remove all minor irregulatities with emery cloth.
•Check the length and I.D. size (at the chuck end) of the collection tube. The tube I.D.
should be no bigger than 1-5/8" (41 mm) and the length should be al least 37-1/2" (95
cm).
NOTE
- Due to the angle of the exhaust into the collection tube two
sides will show increased wear.
- To increase the life of the collection tube, it is important to
index the bit 90° away from the worn area of the collection
tube. This should be done after each hole.
- The wear on the collection tube is determined by a visual
inspection on the last two inches of the bit end of the
collection tube.
BACKHEAD
•Inspect the threads and pin hole for cracks and burrs.
• Remove all burrs on the thread with a ne le.
•Replace if necessary.
BACKHEAD BEARING
•Check for gouges or irregularities.
•Replace if necessary.

11/06/20 Page 7
Patriot®RC50
CHECK VALVE SEAT
•Inspect the outside diameters for nicks, burrs and scoring.
•Remove all minor irregularities with emery cloth.
•Replace if necessary.
CHECK VALVE
•The check valve should be smooth and free from abrasions.
•Replace if necessary.
•Replace the check valve spring if it is worn or broken.
FEED TUBE
•Inspect the outside diameter for nicks, burrs and scoring.
•Inspect all makeup surfaces for indentations or nicks caused by wear.
•Remove all minor irregularities with emery cloth.
•Replace if necessary.
SNAP RING
•Inspect the snap ring for severe wear indications.
•Remove or round over any sharp edges.
•Replace if necessary.
PISTON
•Inspect the striking face, inside and outside diameters for nicks, scoring and cracks.
•Polish the piston with emery cloth to remove all minor irregularities. Cracked pistons
should be replaced.
•Wash the piston thoroughly, inside and out, to remove all emery dust.
•Replace if necessary.

Page 8 11/06/20
Patriot®RC50
CASE
•Inspect the outside diameter for excessive wear or cracks. Inspect the internal case
bore for scoring.
• Remove all minor irregularities with ne honing stones.
•Clearance between the piston and the case should not exceed .012" (.30 mm).
•Select the larger diameter end of case to be the chuck end. Replace if the outside
diameter is worn to 4-1/2" (114 mm) or less near the chuck end.
BIT BEARING
•Inspect the inside and outside for nicks and burrs.
• Remove all internal irregularities with a ne honing stone.
•Remove all external irregularities with an emery cloth.
•Clearance between the bit shank and bit bearing should not exceed .020" (.51 mm).
•Replace if necessary.
BIT RETAINING RINGS
•Inspect for cracks or deformations.
• Remove all irregularities with a le or emery cloth.
•Replace if necessary.
CHUCK
•Inspect for cracks and burrs.
•Collar length should not be less than 1-7/8" (48 mm).
CAUTION
IF THE COLLAR LENGTH IS LESS THAN 1-7/8" (48 MM) AND THE BIT IS UNDER LOAD
CONDITIONS, CONTACT BETWEEN THE SHOULDER OF THE BIT RETAINING RINGS
AND THE BOTTOM OF THE BIT RETAINING RING AREA ON THE BIT COULD CAUSE
THE BIT TO SHANK IN THIS AREA.
•Replace if necessary.

11/06/20 Page 9
Patriot®RC50
GENERAL ASSEMBLY INSTRUCTIONS
•Assembly should be performed in a clean environment.
•All parts should be cleaned thoroughly and wiped dry before assembly.
•Oil all parts by hand using Rock Drill Oil to insure easy assembly.
•Coat all thread connections with a thread compound to allow joints to thread easily.
HAMMER ASSEMBLY
•Select the larger outside diameter end of the case to be the chuck end.
•Insert the snap ring into the groove located in the chuck end of case, making sure
it seats properly in the groove. Slip the bit bearing into the chuck end of the case.
Make sure the bit bearing is in contact with the snap ring in the case.
•Insert the bit bearing retainer o-ring into the groove located just above the bit bearing.
•Slide the piston in the backhead end of the case. Push the piston all the way to the
chuck end. The piston should rid in the case very smoothly.
•Install the backhead o-ring in the groove located at the shoulder end of the case
thread of the backhead. Install the backhead bearing on the outside diameter groove
at the end of the case thread of the backhead.
•Install the check valve seat o-ring in the groove on the outside diameter of the check
valve seat. Install the collection tube o-ring in the inside diameter groove of the check
valve seat.
O-RINGS / BACKHEAD BEARING
•Inspect for damage such as cracks and deformations.
•Replace if necessary.
METERING SLEEVE
•Inspect for cracks.
•Measure OD and always make sure it is a minimum of 1/8" (3 mm) under the bit size.
•Replace if necessary.

Page 10 11/06/20
Patriot®RC50
•With the large diameter of the check valve seat toward the backhead bore, insert the
check valve seat into the backhead.
•With the rubber end of the check valve facing the backhead bore, insert the check
valve into the backhead and over the small diameter of the check valve seat so it
meets with the check valve seat shoulder.
•Insert the check valve spring.
•Install the collection tube o-rings into the inside diameter grooves of the feed tube.
Install the feed tube o-ring in the groove of the outside diameter of the feed tube.
•Insert the large diameter of the feed tube in the backhead so the pin holes on the feed
tube align with the pin holes of the backhead. As the feed tube contacts the check
valve spring in the backhead, apply just enough force to keep the pin holes aligned
while inserting the pins.
•Install the backhead with the check valve seat, check valve, check valve spring,
feed tube, and pins already installed into the backhead end of the case.
•Oil the outside surface of the collection tube. Insert the collection tube through the
backhead, until refusal. Using a rubber mallet, tap on the collection tube until it
protrudes out of the chuck end. Using both hands, pull the collection tube down until
it stops.
CAUTION
THE O-RINGS WHICH SEAL AROUND THE COLLECTION TUBE WILL BECOME WORN
OVER TIME. DISASSEMBLY OF THE HAMMER WILL BE NECESSARY ON A PERIODIC
BASIS TO ENSURE THERE IS A SEAL AND AIR IS NOT LEAKING BY, CAUSING A
LOWER OPERATING PRESSURE.
CAUTION
WHEN CONNECTING THE RC HAMMER TO THE RC DRILL PIPE, MAKE SURE THE
CORRECT CONNECTOR TUBE IS SEATED PROPERLY BETWEEN THE COLLECTION
TUBE AND THE DRILL ROD.
•Insert the bit retaining rings, with the o-ring installed, in the chuck end of the case.
•Install the o-ring into the outside diameter groove of the chuck located above the
shoulder.
•Place the metering sleeve over the chuck and seat against shoulder of chuck.
• Thread the chuck into the case and hand tighten. The chuck shoulder should sit at
against the bottom of the case.

11/06/20 Page 11
Patriot®RC50
CAUTION
DUE TO CLOSE TOLERANCES BETWEEN THE PATRIOT RC50 INTERNAL PARTS AND
THE CASE, NUMA CAN NOT ACCEPT RESPONSIBILITY FOR DAMAGE CAUSED BY
WELDING ON THE CASE OD. WELDING ON THE CASE CAN CREATE DISTORTION,
CAUSE PREMATURE FAILURE AND VOID THE WARRANTY. CONTACT NUMA FOR
SPECIAL INSTRUCTIONS IF WELDING THE CASE BECOMES UNAVOIDABLE.
•Insert the o-rings into the inside diameter groove of the connector tube.
•With the small outside diameter of the connector tube toward the backhead, install
the connector tube on the end of the collection tube.

Page 12 11/06/20
Patriot®RC50
SECTION III
PARTS IDENTIFICATION
EXPLODED VIEW
Hammer Assembly
4 IJ B&M Box #018111 / DR115 Box #018113
Figure 3-1
Case
017081 (1)
Snap Ring
012992 (1)
Bit Bearing
012991 (1)
Bit Bearing Retaining
O-Ring
005764 (1)
Bit Retaining Rings
O-Ring
005571 (1)
Bit Retaining Rings
018089 (1)
Chuck O-Ring
008207 (2)
Chuck
018090 (1)
Backhead
4 IJ B&M Box - 017917 (1)
DR115 Box - 017080 (1)
Backhead O-Ring
008207 (2)
Backhead Bearing
015200 (1)
Pin
015207 (2)
Collection Tube O-Ring
015422 (5)
Check Valve Seat
O-Ring
008208 (1)
Check Valve Seat
012995 (1)
Check Valve
012998 (1)
Check Valve Spring
015409 (1)
Feed Tube Assembly
017803 (1)
Feed Tube O-Ring
005566 (1)
Feed Tube
015201 (1)
Collection Tube O-Ring
015422 (5)
Piston
012994 (1)
Connector Tube
O-Ring - Drill String End
4 IJ B&M - 016173 (2)
DR115 - 005738 (2)
Connector Tube
4 IJ B&M - 017763 (1)
DR115 - 016351 (1)
Connector Tube O-Ring
015422 (5)
Collection Tube
Assembly
017695 (1)

11/06/20 Page 13
Patriot®RC50
SECTION IV
AIR CONSUMPTION CHARTS
PATRIOT RC50
DRILL PRESSURE (BAR)
6.9 13.6 20.4 27.6 34.5
1400
1200
1000
800
600
400
200
CFM
661
566
472
378
283
189
94.4
L/SEC
100 200 300 400 500
DRILL PRESSURE (PSI)
1
2
ORIFICE O-RING
ORIFICE O-RING
INSTALLED 1
REMOVED
2
NOTE
Numa RC hammers utilize feed tube o-rings as a choke. Removal of the feed
tube o-rings allow additional air to pass through the hammer for hole cleaning/
ushing purposes.

Page 14 11/06/20
Patriot®RC50
SECTION V
LUBRICATION
The Patriot RC50 hammer requires a continuous supply of the correct type Rock Drill
Oil or an adequate application of Numa Enviro Lube. The Patriot RC50 hammer consumes at
least two quarts (2 litres) of Rock Drill Oil per hour in order to maintain adequate lubrication.
See table 5-1 for recommended Rock Drill Oil.
As an alternative to Rock Drill Oil, Numa Enviro Lube provides continuous protection
for the Patriot RC50 when 3 oz. (.09 litres) are used every 300' (92 m) or four hours of drilling,
whichever occurs rst. Numa Enviro Lube is utilized in 3-1/2" to 6" hammers only.
Medium SAE 30 Heavy SAE 50
Shell Air Tool Oil S2 A 150 Air Tool Oil S2 A 320
Chevron Aries 150 Aries 320
Conoco Conoco 150 Conoco 320
Numa Bio Blend RDP 150 RDP 320
Table 5-1
Recommended Rock Drill Oil
CAUTION
ROCK DRILL OILS AND NUMA ENVIRO LUBE ARE THE ONLY ACCEPTABLE
LUBRICANTS. SAE 50 ROCK DRILL OIL SHOULD BE USED IN AMBIENT
TEMPERATURES OF 80° FAHRENHEIT (27° CELSIUS) OR HIGHER. CONTACT
NUMA FOR ACCEPTANCE OF ALTERNATIVE ROCK DRILL LUBRICANTS.
CAUTION
THE PATRIOT RC50 HAMMER, AS WITH ANY MACHINE, REQUIRES
CONTINUOUS LUBRICATION. THE FAILURE TO SUPPLY ADEQUATE
LUBRICATION TO THE HAMMER CAN CAUSE PREMATURE FAILURE AND MAY
VOID THE WARRANTY.

11/06/20 Page 15
Patriot®RC50
SECTION VI
STORAGE
When storing a Patriot hammer, it is important to take the necessary steps in order to
insure a smooth operation after restarting.
When the hole is completed and the hammer is to be inactive for several weeks or
longer the following steps should be followed:
Each drill rod should be blown clear of all water. During this process, turn on the in
line lubricator and blow until the rock drill oil can be seen from the bottom end of each drill
rod. In addition, each rod (pin and box end) should be wiped clean and capped to prevent
foreign contaminants from sticking to the connector ends.
SHORT TERM STORAGE
When the Patriot hammer will be stored for only a short period of time the following
steps should be taken:
•Blow the hammer clear of all water.
•Pour one cup of Rock Drill Oil into the backhead.
•Turn the air on and cycle for 10 seconds. This will lubricate the internal parts.
•Cap the backhead and chuck end.
•Store the hammer horizontally in a dry environment.
LONG TERM STORAGE
When the Patriot hammer will be stored for a long period of time the following steps
should be taken:
•Blow the hammer clear of all water.
•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 in the shop.
•Disassemble the hammer.
•Inspect and wipe all the parts clean.

Page 16 11/06/20
Patriot®RC50
•Lubricate all the internal parts with Rock Drill Oil. See table 5-1 on page 12 for suitable
Rock Drill Oils.
•Cap the backhead and chuck ends.
•Store the hammer horizontally in a dry environment.
RESTARTING
Before restarting the hammer after prolonged periods of inactivity, disassemble and
inspect all internal hammer parts.
If any internal hammer parts have oxidized, use an emery cloth to polish each part.
Wash each hammer part, wipe dry, relubricate with rock drill oil and reassemble the hammer.
CAUTION
FAILURE TO CHECK INTERNAL PARTS BEFORE RESTARTING THE HAMMER MAY CAUSE
SERIOUS DAMAGE TO THE HAMMER.