KENT Nordco KF3BM Manuel utilisateur

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This manual applies to Kent Hammer S/N 5001 & Above

• The policy of Kent Demolition Tools is one of continual improvement. We reserve the right to change

design, materials, or specifications at any time, without notice or creating any obligation to previous or

future customers.

• The information contained in this manual is provided at no charge to the customers of the Kent Demolition

Tool Company, a Division of Gougler Industries, inc., Kent, Ohio.

• We hereby grant to our customers the right to reproduce individual pages, electronically or by photocopy,

when used in support of the Kent product described herein, provided that no changes are made to the

material information, no reproductions are sold, and no part of this manual is incorporated in any

publication without the specific written permission from the Kent Demolition Tool Company.

Last Revision: November 2005

NOV/2005 Preface – Page #1

KENT'S COMMITMENT TO ITS CUSTOMERS

For over 45 years, Kent has been dedicated to designing and manufacturing a broad

line of top-performing, quality tools for the demolition and construction industries. We are

continuously gathering experience from many work areas and using that experience to

manufacture the best tools available to meet the needs of ever-changing market

requirements.

Kent demolition tools have been designed from the inside out to deliver the rugged and

dependable day-in and day-out performance you need to get the job done, to minimize

downtime, and to keep the job moving on budget and on schedule. With our wide choice of

hydraulic hammers, pneumatic hammers, concrete crushers, pedestal units,

compactor/drivers, hand-held tools and accessories, you can always choose the right

combination for maximum job productivity.

Kent supports you every step of the way with things like on-site engineering for custom

design work, two strategically located warehouse facilities with extensive tool inventories

assuring on-time deliveries, experienced parts personnel who know how to listen, and a

nationwide distribution network for fast-access sales and service. These are just a few of

the reasons to rely on Kent to satisfy all of your demolition requirements.

Sincerely,

Kent Demolition Tool Co.

Preface – Page #2 NOV/2005

TABLE OF CONTENTS

SECTION A GENERAL INFORMATION

2 HAMMER SPECIFICATIONS

3 SAFETY PRECAUTIONS

4 HAMMER CONSTRUCTION

5 PRINCIPLE OF OPERATION

SECTION B MAINTENANCE

2 LUBRICATION

4 ACCUMULATOR DISASSEMBLY PROCEDURE

8 ACCUMULATOR RE-ASSEMBLY PROCEDURE

10 ACCUMULATOR CHARGING PROCEDURE

14 TORQUE REQUIREMENTS

SECTION C TROUBLESHOOTING

SECTION D PARTS LIST

2 KF3BM HAMMER PARTS

4 KITS:

4 HAMMER LIFTING EYE KIT

5 HAMMER CHARGE KIT

6 ACCUMULATOR KIT

7 SEAL KIT

NOV/2005 Section A – Page #1

SECTION A

GENERAL INFORMATION

Section A – Page #2 NOV/2005

KF3BM

350# Class Hammer

SPECIFICATIONS:

Mounting Style . . . . . . . . . . . . . . . Bare Hammer Power Unit

Weight . . . . . . . . . . . . . . . . . . . . . 162 lbs. (74 Kg)

Length . . . . . . . . . . . . . . . . . . . . . 33.3 in. (845 mm)

AEM Impact Energy Rating . . . . . . 162.0 ft./lbs. (219.6 joules)

AEM Test Flow Rate . . . . . . . . . . . 8.96 GPM (33.92 L/min)

AEM Test Frequency . . . . . . . . . . . 1158.60 BPM (19.31 Hz)

AEM Supply Line Pressure . . . . 1976.86 PSI (136.30 Bar)

Blows/Minute . . . . . . . . . . . . . . . 700 ~ 900

Acceptable Oil Flow. . . . . . . . . . . . 6.5 ~ 10.5 G.P.M.

Operating Pressure . . . . . . . . . . . . 1450 ~ 2500 P.S.I.

Chuck Diameter . . . . . . . . . 2 in. (52 mm)

NOV/2005 Section A – Page #3

SAFETY PRECAUTIONS

Before installation or operation of the hydraulic hammer, the operator and maintenance

personnel should read and understand the following safety precautions:

•The safety alert symbol

means ATTENTION! Your safety is involved!!

•No bystanders are allowed in the vicinity of the hammer while it is in use.

•Stay clear of the hammer while it is in operation. Flying objects can cause severe injuries, or

even death.

•Always wear safety glasses and ear protection when operating the hammer.

•Always wear safety glasses during installation, service or any activities associated with the

hammer.

•Operate the hammer only when the operator is seated with full control of the machine.

•Use the hammer for its intended purpose only.

•When installing or removing the hammer, keep hands and fingers clear of the mounting pin

holes and linkage.

•Make frequent inspections of the hammer and base machine as described in the "Daily

Inspection" section of this manual.

•Do not make any alterations to the hammer without the authorization of Kent's Product Support

Department.

•Anytime service is performed on the hammer, hydraulic pressure in the line must first be

released. Then disconnect the hydraulic lines themselves.

•Never disassemble the hammer without first releasing the gas charges. Failure to comply can

result in serious injuries or death.

•Use only Kent/Nordco replacement parts.

•Never use hands to search for hydraulic fluid leaks, use a piece of paper or cardboard.

Escaping fluid under pressure can be invisible and can penetrate the skin and cause a

serious injury. If any fluid is injected into your skin, see a doctor immediately. Injected

fluid MUST be surgically removed by a doctor familiar with this type of injury or

gangrene may result.

Section A – Page #4 NOV/2005

GENERAL CONSTRUCTION OF THE

HAMMER

1. ACCUMULATOR

The accumulator stores hydraulic fluid for use

during the hammering cycle. It also absorbs any

pulsations seen by the hydraulic circuit.

2. BACKHEAD

The hydraulic ports (pressure and return) are

built into the backhead.

3. THROUGH BOLTS

The three (3) major parts of the hammer, the

front head, cylinder and the backhead, are secured by

four (4) through bolts

4. VALVE

The valve fits over the piston inside the

cylinder, and controls the piston reciprocation.

5. PISTON

The kinetic energy of the piston during the

operation of the hammer, is converted into impact

energy when it is transmitted to the working steel.

6. CYLINDER

The hydraulic circuit for reciprocating the

piston is built into the cylinder. The cylinder is the

heart of the hammer.

7. FRONTHEAD

The fronthead supports the entire hammer.

Due to the shock transmitted by the working steel, the

thrust ring and thrust bushing are built-in.

8. ANVIL

The anvil transmits the piston’s impact energy

onto the spike head.

NOV/2005 Section A – Page #5

PRINCIPLE OF OPERATION

The impact energy is a product of the force acting on piston and the length of its stroke. The

piston is powered by the direct action of the hydraulic oil pressure and flow to the hammer.

The following illustration is a simplified sketch of the hydraulic oil porting of the hammer. Area

(A1) of the piston is larger than area (A2) of the piston. Area (A1) is alternately connected to the

pressure (IN) or the return (OUT) lines of the hammer by the valve. Area (A2) is always connected

to the pressure (IN) line. Area (A3) is an unpressurized chamber which allows for the free

movement of the piston.

The piston rises when area (A1) is

connected to the return (OUT) line. The oil

pressure on area (A2) is greater than the

oil pressure acting on area [A1], driving the

piston upward.

At the end of the return stroke, the

valve shifts, diverting the oil to area (A1) of

the piston. The oil pressure drives the

piston downward striking the working steel.

The kinetic energy of the piston at this

point is transferred to the working steel.

The working steel is then driven into the

material to be broken. At this point, the

valve shifts back to its original position,

causing the cycle to repeat.

To maintain continuous oil flow during

the valve shift, a bladder-type accumulator

is utilized. The accumulator acts as a

variable size reservoir for the oil, allowing

for continuous oil flow during the time the

piston is changing direction. This reduces

the pulsations in the hydraulic system.

Section A – Page #6 NOV/2005

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