NPK C2D User manual

Compactors
Compactors
!Oil Splash Lubrication
!Integrated Flow Control and
Pressure Relieving Valves
!Optional Backfill Blades
!Industry’s Most Comprehensive
Field Service Corps
!Extensive Parts Distribution
System
!Network of Over 350
Distributor Outlets
NPK ATTACHMENTS...designed, built and backed by NPK.
NPK ATTACHMENTS...designed, built and backed by NPK.

Greater impulse energy for more
compactor/driver productivity!
Greater impulse energy for more
compactor/driver productivity!
NPK Compactor/Drivers are designed and built to meet today’s demands for greater jobsite productivity, expanding
and enhancing the versatility of your backhoe or excavator.
The leader in trench compaction technology, NPK delivers the industry’s
greatest impulse forces with overall superior performance through
hydraulically operated rotating eccentric action. Greater vibration
forces generate stress waves in granular or loose soil material,
bringing the soil’s air to the surface and packing the particles
closer together. Greater impulse action works together with
the carrier’s downward forces to compact cohesive
clay-type soils.
Do more work safely a boom’s length away
NPK’s versatile Compactor/Driver can work productively virtually anywhere your excavator or backhoe boom can
reach. In trenches, over and around pipe, to the top of piling and sheeting. Next to foundations and around
obstructions. Even on steep slopes or rough terrain where conventional rollers and other machines either can’t work
or would be hazardous to try. In fact, NPK’s Compactor/Drivers can keep workers a full boom’s length from the
compaction or driving action, away from the danger of cave-ins or equipment contact.
Select the NPK Compactor/Driver
that’s right for your application
NPK’s full selection of Compactor/Drivers
gives you the exact power you need
for your jobs and jobsite conditions.
The right model for carriers
ranging from the smallest
mini-excavators and
backhoe/loaders
to the larger excavators.
Headlining the list of models
is NPK’s C-12C, largest
and most powerful
boom mounted plate
Compactor/Driver
available anywhere.
NPK’s Compactor/Drivers
deliver the industry’s
greatest impulse forces
with hydraulically
operated rotating
eccentric action.
Durable rubber shock
mounts, solid welds and self aligning,
double row, spherical roller bearings
guarantee overall superior performance.
Optional swivel top to minimize carrier repositioning
(not available on the Model C-2D), or optional dedicated
top brackets available for quick-attach applications.
Heavy-duty, high-efficiency gear motor.
Self-aligning, double row
spherical roller bearings.
Oil splash lubrication,
eliminates routine greasing.
Rubber shock
mounts to
isolate vibration.
Direct drive
eccentric
mass.

Cost saving versatility
that is more than a promise!
NPK Compactor/Drivers actually deliver on the promise of greater cost-efficiency and jobsite versatility -
operating advantages that are absolutely required by today’s contractors and budget-conscious
municipalities. Utilizing your carrier’s hydraulic system, you save on fuel as well as the need for other costly ma-
chines and equipment, using your versatile NPK Compactor/Driver for:
!Compacting or driving anywhere a boom can go, and often where a man cannot.
!Driving wood and aluminum sheeting, fence posts, guardrail posts,
rail and I-beams, piling and seawalls, etc.
!Soil and aggregate compaction.
!Trench compaction, as deep as a bucket can dig.
!Steep slope compaction.
!Waste compaction at transfer stations, etc.
!Breaking up frozen coal, salt and other material.
!Extracting piling and sheeting.
Swivel feature to avoid machine repositioning
NPK’s optional self-aligning swivel can align your Compactor/Driver to nearly any job from nearly any carrier
position. With an excavator positioned over, parallel or perpendicular to the job, you can work productively in tight
quarters, narrow trenches next to foundation walls and around manholes or other obstacles. When it’s not needed,
the swivel can be locked in place, either parallel or perpendicular to the boom.
Designed and built for reliability
NPK Compactor/Drivers are designed
and built for optimum dependability
on the most demanding jobsites.
Rugged welds, heavy-duty direct drive
gear motors, durable rubber shock
mounts and self aligning, double row,
spherical roller bearings with a
heavy-duty roller cage.
Cost saving versatility
that is more than a promise!
Integrated flow control
and pressure relieving valves
protect the motor from
excessive flow
and pressure.
Hoses are routed out of the
back of the compactor,
safely away from the
trench wall.
Internally
routed hoses
for maximum
protection.
Optional backfill blade-
available on all models.
Dual backfill blades also
available improving your
ability to push or pull soil,
gravel and debris without
having to rotate the compactor
or reposition the excavator.
These backfill blades are
bolt-on and can be
easily removed
for trenchwork and
transport (note:
when the backfill
blade(s) are
removed the
backfill blade
bracket
does not
extend past
the baseplate).

COMPACTORS
COMPACTORS
More compacting power with excavators and backhoes
NPK Construction Equipment, Inc.
7550 Independence Drive
Walton Hills, OH 44146-5541
Phone [phone]
Toll-free [phone]
Fax [phone]
Internet: www.npkce.com
Each product sold by NPK is subject to an express written warranty. NPK makes no other warranty, express or implied, including any warranty of merchantability or fitness for any
particular purpose. NPK is not liable for any incidental or consequential damages.
Printed in U.S.A. Form No. B06-0100 (05/19) © Copyright 2019, NPK Construction Equipment, Inc.
Sold and Serviced by:
NPK...All the Right Attachments! With innovation throughout construction’s most extensive line.
Hydraulic Hammers Concrete Crushers Material Processors Demolition Shears Demolition Grabs Sheet Pile Drivers Pedestal Breaker Systems
* Operating pressures shown are with standard hydraulic motor. Operating pressures will be different with optional hydraulic motors.
Options are available for special applications. Weight does not include mounting bracket. Specifications subject to change without notice.
Specifications
NPK Model
C-2D C-3D C-4C C-6C C-8C C-10C C-12C
Impulse Force 3,500 lbf 6,000 lbf 7,800 lbf 16,000 lbf 24,000 lbf 34,000 lbf 45,000 lbf
Cycles per Minute 2400 2200 2100 2200 2200 2200 2200
Oil Flow Required (Standard) 13 gpm 16 gpm 22 gpm 33 gpm 43 gpm 51 gpm 70 gpm
(Low Flow Option) Please Contact NPK
Operating Pressure* 1500-2000 psi 1950-2450 psi 1700-2200 psi 1800-2300 psi 2000-2500 psi 2000-2500 psi 2000-2500 psi
Relief Pressure Setting 2500 psi 2600 psi 2600 psi 2600 psi 2600 psi 2600 psi 2600 psi
Swivel Feature N/A Optional Optional Optional Optional Optional Optional
Baseplate Dimensions 12 x 25 in 17 x 28 in 23 x 34 in 29 x 40 in 34 x 46 in 40 x 52 in 45 x 58 in
Compaction Area 2.1 sq ft 3.3 sq ft 5.4 sq ft 8.1 sq ft 10.9 sq ft 14.5 sq ft 18.1 sq ft
Narrow Baseplate N/A N/A Special Order Special Order Special Order Special Order Special Order
Weight (Fixed) 390 lb 700 lb 800 lb 1535 lb 2100 lb 3400 lb 4000 lb
(Swivel) N/A 800 lb 960 lb 1715 lb 2325 lb 3615 lb 4475 lb
Height (Fixed) 28 in 29 in 30 in 39 in 45 in 50 in 55 in
Width 12 in 17 in 23 in 29 in 34 in 40 in 45 in
Recommended 2.5-6 tons 3.5-9 tons 5-12.5 tons 8-21 tons 15-32.5 tons 30-50 tons 40-70 tons
Carrier Weight

HYDRAULIC
COMPACTOR/DRIVER
OPERATORS MANUAL
MODELS:
C2D, C2C, C2
C3D
C4C, C4B, C4A, C4
C6C, C6B, C6
C8C, C8B, C8
C10C, C10
C12C, C12
“Use Genuine NPK Parts”
© Copyright 2020 NPK Construction Equipment, Inc. www.npkce.com C000-9610C Compactor
Operators Manual 9-20
7550 Independence Drive
Walton Hills, OH 44146-5541
Phone [phone]
Fax [phone]

CONTENTS
- 1 -
SAFETY........................................................................................................................................2
FORWARD ...................................................................................................................................4
COMPACTOR/DRIVER APPLICATIONS.....................................................................................4
MAINTENANCE............................................................................................................................5
STANDARD PRACTICES.................................................................................................5
CARRIER COMPATIBILITY .........................................................................................................6
SPECIFICATIONS........................................................................................................................7
COMPACTOR/DRIVER STRUCTURE.......................................................................................10
C2D THROUGH C12C COMPACTOR/DRIVERS...........................................................10
COMPACTOR/DRIVER SERIAL NUMBER LOCATION ............................................................14
UNDERSTANDING COMPACTION ...........................................................................................15
COMPACTION FORCES............................................................................................................16
SOIL MATERIAL.........................................................................................................................17
SOIL DENSITY TESTING...........................................................................................................19
LABORATORY TESTS ...................................................................................................19
FIELD TESTS..................................................................................................................21
FIELD TEST REPORT....................................................................................................23
CLASSIFICATION OF COMPACTION EQUIPMENT.................................................................24
COMPACTION METHODS AND EQUIPMENT SELECTION ....................................................25
COMPACTOR MODEL SIZE vs PERFORMANCE ....................................................................25
PRODUCTIVITY .........................................................................................................................26
HYDRAULIC INSTALLATION.....................................................................................................27
BACKHOE/EXCAVATOR COMPACTOR LINES............................................................27
SHUT-OFF VALVES .......................................................................................................27
COMPACTOR CONTROL VALVE..................................................................................28
RETURN OIL...................................................................................................................28
PREVENTION OF CONTAMINATION............................................................................29
CHANGING THE FILTER ELEMENT AND HYDRAULIC OIL .........................................29
HYDRAULIC QUICK DISCONNECTS ............................................................................30
BACKFILL ATTACHMENT .........................................................................................................33
BEFORE OPERATION...............................................................................................................34
DECIDE IF SWIVEL LOCK FEATURE WILL BE USED ..................................................34
BEFORE OPERATION...............................................................................................................35
LUBRICATION................................................................................................................35
MAINTENANCE AND INSPECTION..........................................................................................36
DAILY MAINTENANCE...................................................................................................36
LUBRICANT TERMS AND DEFINITIONS..................................................................................37
OPERATION...............................................................................................................................39
SOIL COMPACTION.......................................................................................................40
LEAVE IT RUNNING.......................................................................................................41
COMPACTION AROUND PIPE ......................................................................................41
NARROW TRENCH COMPACTION...............................................................................42
SHEET/PILE DRIVING AND EXTRACTING ...................................................................43
SHEET/PILE AND POST/PIPE ADAPTERS...................................................................43
SWIVEL FEATURE.........................................................................................................44
STORAGE OF THE COMPACTOR/DRIVER .............................................................................45
WARRANTY REGISTRATION FOR NEW UNITS......................................................................46
WARRANTY STATEMENTS ......................................................................................................47
NOTES AND RECORDS............................................................................................................49

NPK
- 2 -
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.
1. Operators and service personnel must read, understand and comply with the NPK
INSTRUCTION MANUAL.
2. Keep personnel and bystanders clear of the COMPACTOR/DRIVER while in
operation.
3. Do not operate the COMPACTOR/DRIVER without an impact resistant shield
between the COMPACTOR/DRIVER and the operator.
4. The COMPACTOR/DRIVER must not be operated unless the operator is in full
control of the carrier. Operate the COMPACTOR/DRIVER from the operator’s seat
only.
5. Match the COMPACTOR/DRIVER size to carrier according to NPK
recommendations. See the CARRIER MACHINE COMPATIBILITY section of this
manual.
6. Service personnel must be cautious handling pins and bushings when exchanging
the bucket for the COMPACTOR/DRIVER. The carrier machine operator must
move the stick or boom only when directed by service personnel.
7. If it is necessary to hammer the boom pins in or out, beware of flying metal chips.
Eye protection be worn!
8. Do not operate the COMPACTOR/DRIVER if the hydraulic oil temperature exceeds
180° F (80° C), or at higher than specified flow rates.
9. Be especially cautious around hydraulic lines. Hydraulic oil can be extremely HOT!
Avoid skin contact with hydraulic oil! It can cause severe burns!
10. Protect hands and body from hydraulic fluids under pressure. Escaping high
pressure fluid can penetrate the skin, causing serious injury. Avoid the hazard by
relieving the pressure form the hydraulic system before disconnecting any lines.
Search for leaks with a piece of cardboard or other object. If an accident occurs,
seek medical attention immediately! Hydraulic fluid injected into the skin
must be surgically removed immediately or gangrene may result!

NPK
- 3 -
SAFETY
11. Make daily visual inspections of all fasteners, boom pins, hoses, etc.
12. Do not make any alterations to the COMPACTOR/DRIVER without authorization
from NPK Engineering.
13. Use only NPK supplied replacement parts. NPK specifically disclaims any
responsibility for bodily injury or COMPACTOR/DRIVER damage that results from
the use of parts not sold or approved by NPK.
14. Be careful when you torque fasteners. An overstressed or damaged component
may fail.
15. Use the proper lifting equipment and tools when handling or servicing the
COMPACTOR/DRIVER or components.
16. Important safety and operating decals are included with each
COMPACTOR/DRIVER and HYDRAULIC INSTALLATION KIT. Keep them clean
and visible. NPK will replace decals free of charge as needed.

NPK
- 4 -
FORWARD
This manual has been written to give the necessary instructions for operating,
maintaining, and servicing the NPK Compactor/Driver. Read this manual before start-
up.
For help with any problems encountered, or additional information, contact your NPK
authorized Distributor.
Use replacement parts sold by NPK only. NPK is not responsible for failures resulting
from alterations not approved by NPK or substitution of parts not sold by NPK. Do not
operate the Compactor/Driver underwater without instructions from NPK Engineering.
COMPACTOR/DRIVER APPLICATIONS
The excavator mounted Compactor/Driver is a mobile, self-contained unit that operates
anywhere a boom can reach. This versatile attachment compacts in the trench, around
and over pipe, or reaches to the top of piling and sheeting for driving or extracting in the
toughest of conditions and in rough terrain areas. The mounted Compactor keeps the
workers out of the trench and safe from cave-ins. Even slopes that are too steep for a
conventional roller can be easily reached for compaction.
APPLICATIONS INCLUDE:
•HIGH PRODUCTION SOIL AND AGGREGATE COMPACTION.
•DEEP TRENCH COMPACTION, AS DEEP AS A BUCKET CAN DIG.
•SLOPE COMPACTION.
•WASTE COMPACTION AT TRANSFER STATIONS, ETC.
•BREAKING UP FROZEN MATERIAL, SUCH AS COAL, SALT, ETC.
•DRIVING PILE, SHEET, FENCE POSTS, GUARDRAIL POSTS, ETC.
•EXTRACTION OF PILING AND SHEETING.
•COMPACTING OR DRIVING ANYWHERE A BOOM CAN GO . . . AND MAN
CANNOT.

NPK
- 5 -
MAINTENANCE
STANDARD PRACTICES
Maintenance of and repairs to the COMPACTOR/DRIVER should be performed by an
experienced service technician, thoroughly familiar with all standard practices and
procedures, and most importantly, all safety precautions. The following is a review of
common standard practices to be followed when working with hydraulic equipment, and
is not meant to be all-inclusive. Rather, this review is presented as a reminder as to
some of the unique characteristics of hydraulic equipment.
•The prevention of foreign contaminant damage is critical when working with hydraulic
equipment. Protect exposed holes and parts to guard against entry of contaminants.
Install metal or plastic plugs/caps where applicable to prevent entry of debris into the
hydraulic system.
•Mark the location and position of mating parts as an aid to re-assembly. Mark
corresponding parts uniquely to reflect their relationship, including proper location,
position, orientation, and/or alignment.
DO:
•During assembly, observe all markings made during disassembly, and all
corresponding features of mating parts to ensure proper location, position, orientation
and alignment.
•During disassembly of a sub-assembly, place removed components on a clean, dry
surface, in proper relative position as an aid in re-assembly.
•Always inspect threaded areas on components. Repair or replace as required.
Never apply uncured thread adhesive to a fastener that has cured adhesive on it.
Clean the fastener and the threaded bore. A tap and die may be helpful for this task.
Be sure to remove loose debris from the threaded bore.
•Use care to avoid scratches, nicks, dents, or other damage to machined surfaces of
mating components.
•When securing a component, always tighten cap screws gradually in an opposing
pattern, applying the specific torque.
•Grease can be used to temporarily hold a part in place while the abutting part is
placed into position.
•Always use common sense and exercise standard safety precautions when working
with all tools and equipment required to maintain, repair or troubleshoot the
COMPACTOR/DRIVER.