NPK PH1 User manual

HYDRAULIC HAMMER
OPERATORS MANUAL
PH SERIES HAMMERS
PH1 PH2
PH3 PH4
“Use Genuine NPK Parts”
© Copyright 2016 NPK Construction Equipment, Inc. www.npkce.com H050-9660C PH1, PH2, PH3,
PH4 Operators Manual 3-16
7550 Independence Drive
Walton Hills, OH 44146-5541
Phone [phone]
Toll-free [phone]
Fax [phone]

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CONTENTS
SAFETY..........................................................................................................................3
INTRODUCTION.............................................................................................................5
CARRIER MACHINE COMPATIBILITY ..........................................................................6
HAMMER SPECIFICATIONS .........................................................................................7
STRUCTURE..................................................................................................................8
STRUCTURAL DRAWING..........................................................................................8
HAMMER SERIAL NUMBER LOCATION.......................................................................9
SERIAL NUMBER LOCATION (sn1) ......................................................................... 9
HYDRAULIC INSTALLATION.......................................................................................10
PREVENTION OF CONTAMINATION......................................................................12
HYDRAULIC QUICK DISCONNECTS......................................................................13
MOUNTING INSTALLATION........................................................................................15
REMOVAL FROM THE CARRIER............................................................................ 15
REMOVAL FROM THE SKID STEER.......................................................................16
MOUNTING TO THE CARRIER...............................................................................16
MOUNTING TO THE SKID STEER..........................................................................16
LUBRICATION..............................................................................................................17
GREASING PROCEDURE....................................................................................... 17
CORRECT GREASE AND GREASE INTERVALS...................................................18
CORRECT GREASE FOR HYDRAULIC HAMMERS............................................... 19
NPK HAMMER GREASE.......................................................................................19
AUTO LUBE SYSTEMS.........................................................................................19
AUTO LUBE GREASE LINE PRE-FILLING.............................................................. 20
HAMMER MOUNTED AUTO LUBE GREASE LINE PRE-FILLING.......................... 23
LUBRICATION..............................................................................................................25
LUBRICANT TERMS AND DEFINITIONS................................................................ 25
START-UP OPERATION..............................................................................................28
HAMMERS THAT ARE NEW, REBUILT, OR HAVE BEEN INACTIVE ....................28
BEFORE STARTING THE HAMMER.......................................................................29
DAILY START-UP PROCEDURE............................................................................. 29
OPERATION.................................................................................................................30
OPERATING TECHNIQUES & PRECAUTIONS ...................................................... 31
IMPACT ENERGY TRANSMISSION THROUGH TOOLS............................................36
IMPACT STRESS WAVES AT THE END OF THE TOOL........................................ 37
TOOL BREAKAGE........................................................................................................38
TOOL BREAKAGE DUE TO EXCESSIVE BENDING MOMENT.............................. 38
TOOL BREAKAGE DUE TO EXCESSIVE WEAR OF THE TOOL HOLDER
BUSHINGS............................................................................................................... 39
CHIPPING IN RETAINING PIN SLOT ...................................................................... 41
DEFORMATION OF THE RETAINING PIN SLOT SIDES........................................ 41
DEFORMATION OF THE TOOL TIP........................................................................ 42
CHIPPING OF A MOIL POINT TOOL TIP................................................................ 43
CHIPPING OF A CHISEL TOOL TIP........................................................................ 43
TEMPERATURE RELATED TOOL PROBLEMS...................................................... 44
TOOL BREAKAGE DUE TO CORROSION..............................................................45
TOOL BREAKAGE DUE TO DEFECTIVE MATERIAL............................................. 45

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CONTENTS
ROUTINE INSPECTION AND MAINTENANCE............................................................ 46
WEEKLY INSPECTION ................................................................................................47
TOOLS..........................................................................................................................48
STANDARD TOOLS................................................................................................. 48
ACCESSORY TOOLS .............................................................................................. 48
TOOL IDENTIFICATION...........................................................................................49
CHANGING THE TOOL............................................................................................50
MAXIMUM TOOL TO TOOL BUSHING CLEARANCE.............................................52
TOOL INSPECTION................................................................................................. 54
CHISEL TOOL RESHARPENING............................................................................. 55
STANDARD LENGTH FOR NPK TOOLS................................................................. 56
TOOL RETAINING PIN INSPECTION...................................................................... 57
GAS CHARGE .............................................................................................................. 59
NITROGEN GAS PRESSURE..................................................................................59
GAS CHARGING KIT ............................................................................................... 60
CHECKING THE GAS PRESSURE..........................................................................61
CHARGING THE HAMMER...................................................................................... 63
DISCHARGING THE GAS PRESSURE ................................................................... 64
STORAGE OF HYDRAULIC HAMMER........................................................................65
WARRANTY REGISTRATION FOR NEW UNITS ........................................................ 66
TOOL WARRANTY.......................................................................................................67
WARRANTY STATEMENTS.........................................................................................69
NOTES AND RECORDS ..............................................................................................73

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SAFETY
Safety notices in NPK Instruction Manuals follow ISO and ANSI standards for
safety warnings:
DANGER (red) notices indicate an imminently hazardous situation
which, if not avoided, will result in death or serious injury.
WARNING (orange) notices indicate a potentially hazardous situation
which, if not avoided, could result in death or serious injury.
CAUTION (yellow) notices indicate a potentially hazardous situation,
which, if not avoided, may result in minor or moderate injury.
ATTENTION (blue) notices in NPK Instruction Manuals are an NPK
standard to alert the reader to situations which, if not avoided, could
result in equipment damage.
WARNING and BASIC OPERATING INSTRUCTIONS decals are included with each
NPK hammer and installation kit. Decals must be installed in the cab, visible to the
operator while operating the hammer.
STAY CLEAR, PRESSURE VESSEL, GAS PRESSURE and TOOL SHARPENING
decals are installed on all NPK hammer models. Keep them clean and visible. NPK will
provide decals free of charge as needed.
1. Operator and Service personnel must read and understand the NPK INSTRUCTION
MANUAL to prevent serious or fatal injury.
2. FLYING DEBRIS CAN CAUSE SERIOUS OR FATAL INJURY.
Keep personnel and bystanders clear of hammer while in operation.
Do not operate HAMMER without an impact resistant guard between HAMMER
and operator. NPK recommends LEXANor equivalent material, or steel mesh.
Some carrier manufacturers offer demolition guards for their machine. Check
with the carrier manufacturer for availability. If not
available, please call NPK.
3. Do not hardface or sharpen the tool point with a cutting
torch. Excessive heat from torching or welding can
cause embrittlement, breakage, and flying pieces.
Resharpen by milling or grinding only, using sufficient
coolant.

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SAFETY
4. Fully extend the tool while charging the HAMMER with nitrogen gas. Be sure that
the retaining pin is installed. STAY CLEAR OF TOOL POINT WHILE CHARGING.
5. Do not disassemble a HAMMER before discharging the hammer gas pre-charge.
6. USE NITROGEN GAS ONLY! Store and handle nitrogen tanks per OSHA
regulations.
7. Avoid high pressure fluids. Escaping fluid under pressure can penetrate the skin
causing serious injury. Relieve pressure before disconnecting hydraulic or other
lines.
8. Operate HAMMER from operator’s seat only.
9. Match HAMMER size to carrier according to NPK recommendations. The carrier
must be stable during hammer operation and during transport.
See CARRIER MACHINE COMPATIBILITY section of the NPK instruction manual.
10. Do not make any alterations to the TOOL without authorization from NPK
Engineering.
11. Use proper lifting equipment and tools when handling or servicing the HAMMER.
12. Wear ear protection and safety glasses when operating the hammer. Consult
OSHA/MSHA regulations when applicable.
13. Beware of flying metal pieces when driving mounting pins.
14. If modifications are to be made, do not alter the HAMMER without authorization
from NPK Engineering!
15. Use only genuine NPK replacement parts. NPK specifically disclaims any
responsibility for any damage or injury that results from the use of any tool or parts
not sold or approved by NPK.
For further safety information, consult the AEM Hydraulic Mounted Breakers Safety
Manual, AEM form MB-140 (NPK P/N H050-9600), which is furnished with every NPK
hammer. To request an additional copy, please contact NPK at 800-225-4379 or
Internet at www.npkce.com.

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INTRODUCTION
NPK is a leading manufacturer of HYDRAULIC HAMMERS, and has the most complete
product line available anywhere. The success of NPK is due to our commitment to
quality, dependability and long life. The HYDRAULIC HAMMER has many unique
designed features and it is a company philosophy that the NPK HYDRAULIC HAMMER
can be brought to "like new” condition long after competitive products are scrapped.
You can feel confident that you have purchased the best value available.
This comprehensive operator’s manual contains instructions for operating and
maintaining NPK HYDRAULIC HAMMERS. This manual includes helpful information for
obtaining the full potential and efficiency from NPK HYDRAULIC HAMMERS. Please
read this manual thoroughly to understand the NPK HAMMER and its operating
principles before using it.
For additional information or help with any problem encountered, please contact your
NPK authorized dealer.
Whenever repair or replacement of component parts is required, only NPK parts should
be used. NPK is not responsible for failures resulting from substitution of parts not sold
or approved by NPK.
This manual will also assist NPK Dealers and Customers to obtain the longest possible
life from the NPK Demolition Tools.
Customers can use this manual to take corrective action when tool breakage occurs.
Dealers can use this manual to determine if tool breakage can be claimed under
warranty.
Refer to the NPK Demolition Tool Warranty statement found later in this manual for the
specifics of the warranty coverage.

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CARRIER MACHINE COMPATIBILITY
These carrier weight ranges are intended as a guideline only. Other factors, such as
stick length, counterweights, undercarriage, etc., must be taken into consideration.
Mounting a HAMMER that is too heavy for the carrier machine
can be dangerous and damage the machine. Verify carrier
stability with hammer before transport or operation.
Mounting a HAMMER that is too small for the carrier machine can damage the
HAMMER, cause tool breakage and void Warranties. Please consult NPK Engineering
for specific detailed information.
CARRIER WEIGHT lbs. (kg)
HAMMER MOUNTING RECOMMENDED RANGE
MODEL STYLE lb (kg)
PH1 Excavator 4,850 - 5,955 (2,200 - 2,700)
Skid Steer 4,850 - 5,955 (2,200 - 2,700)
PH2 Excavator 5,955 - 8,820 (2,700 - 4,000)
Skid Steer 5,955 - 8,820 (2,700 - 4,000)
PH3 Excavator 8,820 - 13,228 (4,000 - 6,000)
Skid Steer 8,820 - 13,228 (4,000 - 6,000)
PH4 Excavator 13,228 - 19,842 (6,000 - 9,000)
Skid Steer 13,228 - 19,842 (6,000 - 9,000)
*Specifications are subject to change without notice.

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HAMMER SPECIFICATIONS
HAMMER IMPACT FREQUENCY MOUNTING WORKING TOOL
MODEL ENERGY STYLE WEIGHT DIA. WORKING
CLASS LENGTH
ft. lb. bpm lbs. (kg) in. (mm) in. (mm)
PH1 350 550 - 1,100 Excavator 423 (192) 2.24 (57) 14.0 (356)
Skid Steer 674 (306)
PH2 500 500 - 1,200 Excavator 487 (221) 2.60 (66) 15.1 (384)
Skid Steer 735 (333)
PH3 750 500 - 1,150 Excavator 825 (374) 2.99 (76) 16.5 (419)
Skid Steer N/A
PH4 1300 400 - 1,000 Excavator 1,064 (483) 3.39 (86) 18.5 (469)
Skid Steer N/A
HAMMER OIL FLOW HYDRAULIC OPERATING MINIMUM CIRCUIT
MODEL PRESSURE1RELIEF2
gpm (lpm) psi (bar) psi (bar)
PH1 7 - 15 (25 - 55) 2,175 - 2,465 (150 - 170) 2,965 (204)
PH2 7 -16 (25 - 60) 2,175 - 2,465 (150 - 170) 2,965 (204)
PH3 12 - 27 (45 - 100) 2,175 - 2,465 (150 - 170) 2,965 (204)
PH4 13 - 32 (50 - 120) 2,175 - 2,465 (150 - 170) 2,965 (204)
NITROGEN GAS PRECHARGE
HAMMER AT AMBIENT TEMPERATURE
(cold before operating) AT OPERATING TEMPERATURE (hot, after 1 to 2 hrs. operation)
MODEL
*psi (bar) *psi (bar)
PH1 175 (12) 220 (15)
PH2 175 (12) 220 (15)
PH3 175 (12) 220 (15)
PH4 175 (12) 220 (15)
*The gas charge tolerances plus 0, minus 25 psi (2 bar).
*Specifications subject to change without notice.
NOTES:
1. Hydraulic operating pressure maximum is inlet pressure at the hammer with the oil at
operating temperature and with the gas charge set at the hot operating pressure. See
CHECKING THE HYDRAULIC PRESSURES section in the Service Manual.
2. Circuit relief pressure is at least 500 psi (35 bar) above hammer operating pressure.
3. Cold gas charge is the initial set with the hammer at ambient temperature.
4. Hot gas charge is checked after 1 to 2 hours of running and with a system oil temperature of
140to 180F (60
 to 80  C). This is the preferred check.
5. Pressures listed are the maximum allowed. Use tolerance of minus 25 psi (2 bar).

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STRUCTURE
STRUCTURAL DRAWING
MODELS PH1 – PH4
30 GREASE FITTING
A MAIN BODY
BB PLUNGER
D RETAINING PIN
E RETAINING RING
G TOOL BUSHING
HH TOOL
L GAS HEAD
M CHARGE VALVE
N PISTON
O MAIN BODY SLEEVE (A)
P MAIN BODY SLEEVE (B)
Z VALVE SPOOL

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HAMMER SERIAL NUMBER LOCATION
SERIAL NUMBER LOCATION (sn1)

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HYDRAULIC INSTALLATION
NPK can produce INSTALLATION KITS for virtually all compatible backhoe loaders,
excavators, and skid steers. Complete parts and instructions for the hydraulic
installation of the NPK HYDRAULIC HAMMER including valves and/or controls, hoses
and fittings, boom and stick tubing, and clamps are provided.
HAMMER LINES (BACKHOE and
EXCAVATOR)
Typically, the pressure line is arranged on the left side of the
boom and routed to the hammer “IN” port (6) and the return line
is routed from the hammer “OUT” port (5) on the right side. Flow to the hammer is
controlled from an auxiliary valve on the carrier or from an NPK supplied valve.
Hydraulic oil, generally, is routed back to the tank thru the carrier’s oil cooler and filter.
HAMMER LINES (SKID STEER)
Flow to the hammer (m3) is directed from an
auxiliary valve on the skid steer. NPK hammer
ports are marked “IN” and “OUT”. On skid
steers where the auxiliary flow is excessive for
the hammer model, a flow control valve (ma3) is
recommended. Return oil (m4) is routed back to
tank through the skid steer return circuit.
HAMMER CONTROL VALVE
NPK uses two general types of control systems,
depending upon the carrier model:
1. CONTROL SYSTEM USING THE CARRIER AUXILIARY OR SPARE VALVE
SECTION.
This type of installation utilizes an existing carrier valve. Any additional parts, such
as a mechanical linkage, hydraulic pilot actuators, flow control valves, etc., are
furnished in the NPK HYDRAULIC INSTALLATION KIT. Special hydraulic pressure
control valves are not required. The NPK HYDRAULIC HAMMER operating
pressure is self-regulating.
2. CONTROL SYSTEM USING THE NPK MULTIVALVE.
For carriers not equipped with a suitable auxiliary or spare valve section, the NPK
HYDRAULIC INSTALLATION KIT includes a solenoid operated, priority flow control
valve to operate the NPK HYDRAULIC HAMMER. The NPK MULTIVALVE is
specifically designed for the operation of boom mounted attachments.

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HYDRAULIC INSTALLATION
SKID STEER HAMMER FLOW CONTROL VALVE (OPTIONAL)
Be sure that the pressure (m3) and return lines (m4) are properly routed.
Inlet pressure connects to port “P” on the NPK flow control valve (ma3). Regulated flow
from valve port “H” (m5) connects to the “IN” port on the NPK hammer. The “OUT” port
on the hammer connects to port “T2” (m6) on the flow control valve. “T1” connects to
the return line (m4) on the skid steer.

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HYDRAULIC INSTALLATION
PREVENTION OF CONTAMINATION
1. A hydraulic hammer is harder on oil than using a bucket, so the oil is apt to
deteriorate and breakdown sooner. Neglect of the oil system can not only damage
the hydraulic hammer but also cause problems in the carrier which could result in
damaged components. Care should be taken to check for contamination of the oil
and to change it if it is found contaminated. Oil sampling at regular intervals is
highly recommended.
When the hydraulic oil shows low viscosity and bubbles, this indicates that the oil
is deteriorated. If the oil is dark brown and gives off an offensive odor, it is
severely deteriorated. Change the oil immediately!
When the oil is clouded, or the oil filter has become clogged, it indicates that the
oil is contaminated. Change the oil immediately!
To change the contaminated hydraulic oil, drain the hydraulic system completely
and clean components. Do not mix new oil with the old.
2. Do not allow any contamination to mix with the oil. Take special care in preventing
contamination from entering the hydraulic system through the hose or tube
connection when changing the hydraulic hammer with the bucket.
3. Low oil level will cause heat build-up, resulting in deterioration of the oil. Also, it may
cause cavitation due to air mixing with the oil, leading to a damaged hydraulic
hammer and carrier components. Keep the oil at the proper level at all times.
4. Do not use the hydraulic hammer at an operating temperature higher than 180°F
(80°C). The proper operating oil temperature range is between 120°F (50°C) and
180°F (80°C). Since contaminated cooler fins causes reduced efficiency of the
cooler, keep the cooler fins clean at all times. Check the hydraulic oil cooling system
to be sure it is working effectively. The use of a heat gun is the best way to evaluate
if the cooler is working properly.
5. Water in the hydraulic oil will lead to damage of the hydraulic hammer and carrier.
Drain off water and foreign matter from the hydraulic tank at specified intervals.
When out of service, the hydraulic hammer should be stored indoors.
CHANGING THE FILTER ELEMENT AND HYDRAULIC OIL
Change the filter element and hydraulic oil at the intervals described in the operation
manual of the skid steer or excavator, when using a hydraulic implement. Another
method is to set up an oil sampling schedule and change accordingly.

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HYDRAULIC INSTALLATION
HYDRAULIC QUICK DISCONNECTS
NPK recommends against the use of non-NPK quick
disconnects on hydraulic circuits operating NPK Products.
1. The hydraulic pulsations caused by hydraulic hammer operating can cause internal
pieces of non-NPK quick disconnect to disintegrate. These pieces would migrate
into the hammer, causing damage.
2. If quick disconnects are not used when the hammer is removed from the excavator,
the hose ends should be capped to keep them clean. If this is not done,
contamination in the hose ends will be flushed into the hammer when re-connected.
This, again, can cause damage.
3. Most quick disconnects create a restriction in the circuit. NPK Hammers are not
backpressure sensitive, but restrictions cause unnecessary heating of the oil. Also,
the pressure required to operate the hammer, plus the restriction in the quick
disconnects may push an older, low pressure, carrier machine to the limit of its
hydraulic system. This would interfere with proper hammer operation. However,
the NPK approved quick disconnects are properly sized so that the hammer
operation is not affected.
APPROVED CONNECTION (39) NOT RECOMMENDED CONNECTION Non-NPK Quick Disconnects (32)
NPK APPROVED CONNECTION QUICK DISCONNECTS
CONTACT YOUR NPK DEALER FOR ADDITIONAL INFORMATION ABOUT
NPK QUICK DISCONNECTS (DX)

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HYDRAULIC INSTALLATION
HYDRAULIC QUICK DISCONNECTS
If hydraulic quick disconnects are used with the NPK Hammer, it is recommended that
the following precautions be followed.
1. Periodic inspection of both male
(DXm) and female (DXf) ends is
recommended to ensure the
couplers are in good working
condition. Failure to inspect
couplers may result in pieces from
a damaged or failed coupler to be
injected into the hammer or parts
of the coupler returned to the
machine.
2. Check for dirt, dust, and debris on
both male and female couplers
before coupling.
3. Be sure that the couplers are
completely seated together (38).
4. When replacing couplers, be sure
that couplers are replaced as a set,
male and female. Do not use one
new end and one used end.

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MOUNTING INSTALLATION
NPK Mounting Installation Kits include the parts required to adapt the NPK HYDRAULIC
HAMMER to the carrier. NPK mounting kits include the hammer mounting bracket,
mounting pins (optional), flow control valve (optional), and hoses to connect to the
carrier hydraulic system (optional).
BACKHOES and EXCAVATORS
AF Hex Head Cap Screw (if required)
g20 Male Adapter (if required)
m12 Hex Nut (if required)
DXm Male Quick Disconnect (if required)
DXf Female Quick Disconnect (if
required)
m1 Stick Pin (if required)
m2 Link Pin (if required)
m3 (Whip) Pressure Hose
m4 (Whip) Return Hose
m7 Top Bracket
m8 Hammer Bolt Package
m9 Klik Pin (if required)
SKID STEERS
NPK Mounting Installation Kits for skid
steers include parts required to adapt the
NPK HYDRAULIC HAMMER to the
carrier. NPK mounting kits include the
hammer mounting bracket (m7), and
hoses (m3 and m4) to connect to the
carrier hydraulic system. The flow control
valve (ma3) is optional.
REMOVAL FROM THE CARRIER
BACKHOES and EXCAVATORS
1. Close pressure and return line shut-off
valves (k4) if available.
2. Disconnect hydraulic hoses (m3 and
m4) before laying the hammer down.
3. Cap the pressure and return lines on
the carrier and connect the hammer
whip hoses to the hammer bracket.
4. Position the hammer (DR) horizontal
on wood blocks (t20) and remove stick
(m1) and link (m2) pins.

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MOUNTING INSTALLATION
REMOVAL FROM THE SKID STEER
1. Position the hammer (DR) horizontally
onto the ground or wood blocks (t20)
as shown.
2. Disconnect both inlet and outlet hoses.
3. Unlatch the mechanism holding the
hammer bracket to the carrier’s
coupler plate. (Consult the machine
manufacturer’s operator/instruction
manual for this procedure.
The tool end of the hammer should be set lower than the head end to prevent
moisture from entering the hammer through the tool area.
MOUNTING TO THE CARRIER
BACKHOES and EXCAVATORS
1. Place the hammer assembly (DR)
horizontally on wood blocks (t20) as
shown.
2. Align the stick pin bore (m26). Install
the stick pin. Then align the link pin
bore (m25).
3. Connect the pressure side hose (m3)
and the return side hose (m4).
4. Open the shut-off valves (k4) if
available.
MOUNTING TO THE SKID STEER
1. Place the hammer (DR) horizontally
onto wood blocks (t20) as shown.
2. Align the carrier’s coupler plate with
the hammer bracket. Couple the two
per the machine manufacturer
recommendations.
3. Connect the hoses.
Consult the skid steer manufacturer’s operators manual to
review the mounting and removal process!
The hydraulic lines must be handled carefully and sealed to
prevent contamination from entering the hammer or the
carrier’s hydraulic system.

- 17 -
LUBRICATION
GREASING PROCEDURE
1. Place the hammer in a vertical position, applying enough down force to push the tool
up into the hammer.
2. Turn the machine off.
3. Grease the hammer until grease begins to come out around the tool and lower
bushing.
4. Grease hammer at least once an hour. See “Correct Grease and Grease Intervals”
for a more exact greasing procedure.
APPLY DOWN FORCE TO PUSH TOOL UP INTO HAMMER
NOTE: USE A GOOD QUALITY EP #2 LITHIUM BASED GREASE WITH WEAR
INHIBITING ADDITIVES, SEE PAGES 18 AND 19.

- 18 -
LUBRICATION
CORRECT GREASE AND GREASE INTERVALS
Proper hammer maintenance requires a sufficient supply of the correct grease to the
tool (chisel). The tool must be pressed against a hard surface until it stops up inside the
hammer. This prevents grease from entering piston impact area and ensures proper
distribution of grease between the tool and tool bushings.
GREASE INTERVALS
If the hammer is not connected to an Auto Lube System, see page 19, the hammer
must be greased at regular intervals to get the best life from the tool and tool bushings.
There are two ways to determine grease intervals:
First, grease the hammer at the beginning of the job until grease comes out between
the tool and the lower tool bushing. Run the hammer until the shank of the tool starts to
look dry. This determines the time interval for the greasing of this particular hammer on
this particular job. Typically, this is 1 to 4 hours. Also, note the amount of grease
needed to re-grease the tool. This gives you the amount of grease and how often it
must be applied. An example would be that a particular hammer, on a particular job,
requires half a tube of grease every 3 hours. This would be the greasing schedule you
would set up. If this hammer was moved to another job, another grease schedule may
have to be determined.
Second, if you can’t control the grease schedule, such as rental units, then have the
operator grease the hammer once every hour of hammer operation. Again, grease the
hammer until grease comes out between the tool and tool bushing. This is usually more
often than required, but is far cheaper than replacing prematurely worn tools and tool
bushings.
CORRECT GREASE
The type of grease used is very important. NPK recommends a lithium soap base EP
(Extreme Pressure) NLGI #2 Grease, with Moly (Molybdenum Disulfide) or other
surface protecting additives. A high drop point 500°F (260°C) grease is desirable.
There are many manufacturers of grease that meet NPK’s recommendations. NPK
does not endorse any one brand as being superior to another. If you or your customers
question a brand to be used, please call the NPK Service Department at 800-225-4379.

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LUBRICATION
CORRECT GREASE FOR HYDRAULIC HAMMERS
NPK HAMMER GREASE
NPK now offers hammer grease specially formulated to meet severe job requirements.
The grease is available in three different temperature ranges - 350°, 500°, and 2000°.
Universal Plus and Super Duty are lithium soap based products that resists washout
and contain NPK-10 additive for surface protection in friction affected areas.
Chisel Paste is an aluminum complex soap base with 12% graphite and copper
additives for extreme operating conditions.
AUTO LUBE SYSTEMS
An automatic greasing system is
recommended to reduce hammer tool and
tool bushing wear. THE NPK AUTO LUBE
SYSTEM is designed to automatically
provide a continuous supply of grease to
the hammer tool and tool bushing –
increasing tool and tool bushing life by
reducing wear. The AUTO LUBE pump is
capable of pumping EP2 grease in cold
weather. The pump output is adjustable
according to the requirements of the
hammer model and to compensate for tool
bushing wear.
26 – AUTO LUBE PORT
29 – GREASE LINE
30 – GREASE FITTING FOR MANUAL
LUBRICATION
NPK GH Series hammer models have a connection port (26) for an automatic greasing
system. Refer to the NPK AUTO LUBE Instruction Manual for details. If the AUTO
LUBE is not used, you can grease unit through fitting (30) as shown.
UNIVERSAL PLUS NPK PART
350 deg NUMBER
14 oz. (.397 kg) CARTRIDGE G000-1010
120 lb. (54 kg) KEG G000-1020
35 lb. (16 kg) PAIL G000-1030
400 lb. (181 kg) DRUM G000-1040
SUPER DUTY NPK PART
500 deg NUMBER
14 oz. (.397 kg) CARTRIDGE G000-1011
120 lb. (54 kg) KEG G000-1021
35 lb. (16 kg) PAIL G000-1031
400 lb. (181 kg) DRUM G000-1041
CHISEL PASTE NPK PART
2000 deg NUMBER
14 oz. CARTRIDGE G000-1050
35 lb. (16 kg) PAIL G000-1060
400 lb. (181 kg) DRUM G000-1070