NetterVibration NHG Series User manual

Serving industry with vibration
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NetterVibration
Operating Instructions for Juli 2007
Netter Hydraulic External Vibrators BA Nr. 850E
Series NHG
These operating instructions apply for: NHG 500 (L)
NHG 600 R (L)
NHG 900 (L)
NHG 3000 (L)
NHG 500 – 900 with and without leak oil connection
NHG 3000 with and without leak oil connection
Important Note:
Before use of the hydraulic external vibrators series NHG read this operating
instruction carefully and store afterwards.
Netter GmbH does not assume liability for damage or injury resulting from technical
modifications to the product, or failure to observe the instructions and warnings in
this operating manual.
This documentation is subject to copyright. All rights e.g. for the translation, printing
or reproduction of this operating manual, or parts thereof, are strictly reserved.

2
Table of Contents
1 GENERAL NOTES ..............................................................................................3
2 TECHNICAL SPECIFICATIONS .........................................................................3
3 DESIGN AND WORKING PRINCIPLE................................................................5
4 SAFETY...............................................................................................................6
5 TRANSPORT AND STORAGE ...........................................................................7
6 INSTALLATION...................................................................................................8
7 OPERATION......................................................................................................10
8 MAINTENANCE.................................................................................................12
9 TROUBLESHOOTING.......................................................................................13
10 SPARE PARTS..................................................................................................14
11 APPENDIX.........................................................................................................14
11.1 Accessories ..... 14
11.2 Disposal ..... 14
11.3 Enclosures ..... 14
Scope of delivery:
Examine the packaging for possible shipping damage.
If damage to the packaging is found check the content
for completeness and possible damage. In case of
damage inform the delivery service. Check the scope of
delivery against the delivery note.

3
1 General notes
Hydraulic external vibrators series
NHG comply with the EC-machine
regulation 89/392/EEC. The standards
DIN EN 292, part 1 and 2 must be
observed in particular.
These hydraulic vibrators generate
multi-directional oscillations.
The general field of application is the
emptying of bulk material, especially
for transport vehicles such as trucks,
silo busses and ships, also against
bridging and rat holes.
The drive medium is hydraulic oil or
engine oil respectively.
2 Technical Specifications
Drive medium:
Clean hydraulic oil DIN 51524/25 or engine oil DIN 51511
Viscosity range:
13 to 200 mm²/s
Recommended range: 15 to 45 mm²/s
Filtration:
≤10 μm, NAS 1638 class 10, ISO/DIS 4406 class 19/16
Tank breather filter: ≤10 μm
Permitted speed for continuous duty:
NHG 500, NHG 600: Max. 6000 rpm
NHG 900: Max. 4000 rpm
NHG 3000: Max. 3500 rpm
Optimum operating pressure:
120 bar
Environmental temperature:
NHG 500 to NHG 900: -20°C to 80°C
NHG 3000: -20°C to 60°C
Drive medium temperature:
-15°C to 90°C
Working temperature:
-20°C to 130°C
Lubrication:
NHG 500 to NHG 900: Lifetime lubricated ball bearings
NHG 3000: Oil mist lubrication with SAE 22
NHG 500, NHG 900 and NHG 3000
have a fixed unbalance. Adjustable
eccentric weight and larger types of
vibrators on request.
Speed and centrifugal force can be
regulated via the oil flow.
Type NHG 600 R (reversible) has an
unbalance that can be adjusted in
seven steps. Adjustment of the
eccentric is accomplished from outside,
no opening of covers required.
The designations of the hydraulic
external vibrators NHG partly have the
extension (L). The letter indicates that
the drive has a leakage bore.
Noise level:
The noise level is less than 80 dB(A).
Depending on the application a noise
level of S85 dB(A) may be reached.

4
Technical Specifications
Long term operation
AT/h > 60%
Short term operation
AT/h < 60%
Weight
Unbalance Speed Centrifugal
force Flow Speed Centrifugal force Flow
Type [kg][cmkg][rpm][N][l/min][rpm][N][l/min]
NHG 500 (L) 6,4 2,06 6.000 4.070 12 7.000 5.550 14
NHG 600 R (L)** 8,2 3,00 6.000 5.922 12 7.000 5.723* 14
NHG 900 (L) 7,7 6,64 4.000 5.870 85.000 9.100 10
NHG 3000 (L) 29,0 29,18 3.500 19.600 20 4.000 25.600 22
*) In this case the unbalance must be reduced to 2,19 cmkg.
**) See table of eccentric adjustments on page 11.
Note:
In order to protect the vibrators against too high speeds, a flow control
valve should be used to limit the oil flow to the permitted quantity (see
required oil).
As a control measure check the frequency with a sirometer.

5
Dimensions:
NHG 500, NHG 600 R and NHG 900
NHG 3000
A B C D E F Ø G H I K Ø L M Ø P Ø R
Type [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm]
NHG 500
NHG 600R
NHG 900
194 120 120 160 24 36 17 212 80 37 G1/4 47 G1/4 G3/8
NHG 3000 260 190
(210) 140 200 30 60 (80) 17 320 70 50 M12×1,5 94
(114) G3/8 G1/2
3 Design and Working Principle
On hydraulic external vibrators of
series NHG a hydraulic motor drives
a shaft with eccentrically weight.
The eccentric weight revolving at high
speed creates high centrifugal forces
(infinitely adjustable on type NHG 600 R).
The external vibrator NHG mainly
consists of a housing with a shaft
running in radial bearings carrying an
eccentric in its middle. The motor
flange serves as receptacle for the
hydraulic motor.
The over-dimensioned bearings are
designed for heavy loads and high
speeds.
The housing of NHG 500 to NHG 900
is made of an aluminium alloy. The
housing of the NHG 3000 is made of
high strength nodular cast iron.
The bearing plates and the housing of
the hydraulic drive are made of
aluminium.
The shafts of hydraulic drive and
eccentric are made of alloyed
tempering steel.

6
4 Safety
The hydraulic external vibrators of series
NHG work with operating pressures of up to
300 bar.
Make sure that the hydraulic unit is
switched off and secured against
unintended switching on during installation
and before other work on the hydraulic
external vibrator and the supply lines.
Main switch
Before starting operation al hoses (P; T; [L])
must be tightly connected.
A hose under pressure coming loose can
cause severe injury and environmental
damage.
The hydraulic external vibrator as well as
part of the structure may come loose
because of vibration. Falling parts can
cause damage to persons, environment
and material. Locking devices must be
used.
Screw connections must be checked and, if
necessary, retightened after 1 hour of
operation and then at regular intervals
(normally every three months).
For critical mounting situations safety
measures with clamp and wire rope are
beneficial, so that the vibrator cannot drop
down and damage the hydraulic hoses.
A suspension set is available on request.
In the vicinity of the structure connected to
the hydraulic external vibrator the noise
level may exceed 85 dB(A). When working
in the noise area ear defenders are required,
if the noise level exceeds 85 dB(A).
Technical changes to the equipment may effect the characteristics of
these hydraulic external vibrators or even damage the units and will cause
the rejection of any warranty claims.

7
Permissible operating conditions:
Optimum operating pressure: 120 bar
Starting pressure: 20 bar to 40 bar
Maximum permissible operating pressures and speeds:
Type Pressure side Return flow Frequency for
continuous duty
NHG 500 200 bar ≤0,5 bar 6.000 rpm
NHG 600 R 200 bar ≤0,5 bar 6.000 rpm
NHG 900 200 bar ≤0,5 bar 4.000 rpm
NHG 3000 300 bar ≤2 bar 3.500 rpm
Type Pressure
side
Return
flow
Leakage
line
Frequency for
continuous duty
NHG 500 L 200 bar 20 bar ≤1 bar 6.000 rpm
NHG 600 R L 200 bar 20 bar ≤1 bar 6.000 rpm
NHG 900 L 200 bar 20 bar ≤1 bar 4.000 rpm
NHG 3000 L 300 bar 30 bar ≤2bar 3.500 rpm
Environmental temperature:
NHG 500 to NHG 900: -20°C to 80°C
NHG 3000: -20°C to 60°C
Drive medium temperature:
-15°C to 90°C
Working temperature:
-20°C to 130°C
Lubrication:
NHG 500 to NHG 900: Lifetime lubricated grooved ball bearings
NHG 3000: Oil mist lubrication with SAE 22.
During operation the temperature of the vibrator can reach
such high values, that there is a risk of burning. > 80°C
5 Transport and Storage
The units are packed ready for installation.
The nameplate is attached to the
hydraulic external vibrator.
If not specified differently accessories and
attachments will be supplied loosely.
Special transport conditions are not
specified.
The units should be stored in a dry and
clean environment.
For operation the hydraulic external
vibrator must be bolted on.
The storage temperature may be between
-40°C and 120 °C. (This does not apply
for the operating temperature, compare
with chapter 2 page 3 and chapter 4
„Safety – Permissible Operating
Conditions” on page 7).

8
6 Installation
During installation or other work on the
hydraulic external vibrator make sure that
the hydraulic unit is switched off and
secured against unintended switching on.
Installation of hydraulic external vibrators:
Hydraulic external vibrators NHG 500 to
NHG 900 may be mounted in any position.
The hydraulic external vibrators NHG are
bolted to stiffening sections (U-section with
fastening plate).
During installation ensure tension free
fastening of the unit.
The fastening plate must be exactly flat!
Tighten the fastening screws only when the
motor flange is sitting correctly.
Please observe already during installation: During operation the
permissible temperature range must not be exceeded, see chapter 4,
“Safety”. Versions for other temperature ranges on request.
For fastening use self-locking nuts or a locking fluid.
Use tightening torques according to the following table.
Higher tightening torques may cause fracture of screws or tearing of
threads. Inadequate screw connections may cause loosening by
vibration. This can cause damage to persons and material!
Recommended mean tightening torques for screws of strength class 8.8
(screws as supplied, without additional lubrication):
Type Thread/drill pattern (mm) Torque
NHG 500, 600 and 900 M 16 / 160 x 80 220 Nm
NHG 3000 M 16 / 200 x 70 220 Nm
In order to assure free operation the contamination in the oil must be
maintained at an acceptable level. The recommended max. degree of
contamination is 19/16 (see ISO 4406).

9
Standard installations for hydraulic external vibrators of series NHG
Connect NHG vibrators only with hoses! When using tubes these may be
damaged during operation. The length of hoses shall be as short as
possible and as long as necessary, however, it shall not exceed 10m.
The permissible direction of rotation ( P è
èè
èR ) must be observed
when connecting the hoses!
Conventional way valves (2/2 way, 4/2
way etc.) or ball valves may be used
to control the vibrator.
The components used must be
approved for pressure medium and
system pressure.
Avoid sudden starting or stopping of
hydraulic external vibrators, as otherwise
premature wear of motor shaft,
coupling, and vibrator shaft may occur.
For control purposes we recommend
the use of a progressive way valve.
For frequent switching on and off a by-
pass line should be installed, so that
the gear motor cannot create a
vacuum in the supply line.
NHG
M E
Hose
Hose
Possible control for a hydraulic
external vibrator without leak oil port.
Possible control via ball valve or 2/2-
way valve.
Attention:
Do not exceed the maximum flow of
oil. There is a risk of overloading
the NHG (see chapter 2 page 5
Technical Data).
NHG
M E
Hose
Hose
Possible control for a hydraulic
external vibrator without leak oil port
with by-pass line, flow control and way
valve for high cycle frequencies.
M
NHG L
E
Hose
Hose
Possible control for a hydraulic
external vibrator without leak oil port
with by-pass line, flow control and way
valve for high cycle frequencies and
two directions of rotation.

10
Direction of rotation:
Hydraulic vibrators of type NHG without leak oil port must only be operated
with the specified direction of rotation. With these units a loading of the
return flow with system pressure must be ruled out.
Connecting data
Pressure Return side Leakage line
Type Thread NW [mm] Thread NW[mm] Thread NW[mm]
NHG 500 G 1/4 8-12 G 3/8 12-15 - -
NHG 600 R G 1/4 8-12 G 3/8 12-15 - -
NHG 900 G 1/4 8-12 G 3/8 12-15 - -
NHG 3000 G 3/8 12-15 G 1/2 15-18 - -
NHG 500 L G 1/4 8-12 G 3/8 12-15 G 1/48
NHG 600 R L G 1/4 8-12 G 3/8 12-15 G 1/48
NHG 900 L G 1/4 8-12 G 3/8 12-15 G 1/48
NHG 3000 L G 3/8 12-15 G 1/2 15-18 M12×1,5 8
Checklist for installation:
1)
2)
3)
4)
Consider the expected operating temperature.
Tighten the fastening screws for the NHG.
Assemble way and flow control valve, supply, return and by-pass lines.
Check!
Has the direction of rotation of the hydraulic motor been observed?
Have the hoses been tightened?
Have the specifications on nominal diameters been observed?
Has the unit been secured against falling down?
7 Operation
Flushing:
Before starting hydraulic external
vibrators all corrosion protection
residues or impurities that have
entered during transport and storage
must be flushed out with the hydraulic
fluid to be used.
Filter:
During the running-in phase use a
filter R5μm for 2-3 hours, then
change to R10μm (19/16 ISO 4406).
Leak oil port:
If NHG have to be operated with
higher pressures in the return flow, the
version with leak oil port must be used
(for permissible operating pressures
refer to chapter 4 safety page 7).
The leakage line must be routed in a
size and should end in the tank below
the fluid level, so that the unit stays
filled, but no siphon effect is created
inside the tank.
Direction of rotation:
Hydraulic external vibrators without
leak oil port (L) have only one
permissible direction of rotation. A
change in the direction of rotation can
only be made by Netter GmbH.
Hydraulic external vibrators with
leakage port can be used for both
directions of rotation.
Regulating the speed:
Regulation of the speed can only be
accomplished by an external control
with adjustable flow control valve.
Possible controls see chapter 6
"Assembly” on page 9.

11
When using adjustable flow control valves for overload protection and
frequency control the max. oil flow quantity must not be exceeded
(danger of overloading the unit).
When using static flow control valves the preadjustment must be
adapted to the maximum oil flow quantity for the hydraulic external
vibrator.
Adjusting the unbalance on the NHG 600 R:
For the adjustment of the unbalance a
special socket wrench (16) for the
shaft (3) as well as 4 mm hexagon
spanner (17) is required. The socket
wrench (16) is used to rotate the shaft
(3), until it can be inserted into the
bore in the eccentric (12).
Now the Allen screw (14) must be
loosened. This requires four
revolutions.
The socket wrench (16) remains
plugged in until the eccentric (12) is
locked.
The shaft (3) can now be turned and is
adjusted to the desired position by
means of the socket wrench (16) (see
Technical Data chapter 2 page 4). The
hexagon spanner (17) is now turned
for one revolution in clockwise
direction, while the shaft (3) is turned
to and fro for a few mm, until the
locking bore in the shaft (3) can be
felt. Then tighten the screw (14) for
the last three turns (torque 15 Nm!).
Type NHG 600 R (reversible) has an unbalance that can be adjusted in seven steps.
Eccentric adjustment Unbalance Centrifugal force [N]
Pos. [%] [¨°] [cmkg] 6000 rpm 7000 rpm
117 160 0,52 1026 1397
2 38,3 135 1,15 2270 3090
350 120 1,50 2961 4030
4 70,6 90 2,13 4205 5723
586,6 60 2,60 5133 6986
6 92 45 2,8 5528 7523 *)
7100 03,00 5922 8061 *)
*) Speeds higher than 7000 rpm and centrifugal forces higher than 6000 N causes excessive wear on bearings and shaft
seal.

12
Checklist for starting operation:
1)
2)
3)
4)
Check all hose connections before starting.
If necessary adjust the required speed on the flow control.
Observe specified values, particularly max. speeds and max.
pressures.
After filling all lines and vibrators the suction line of the pump must still
be sufficiently below the fluid level.
The fastening screws must be retightened or checked after one
operating hour. After this the fastening screws must be checked and, if
necessary, retightened at regular intervals (normally every three
months).
8 Maintenance
Hydraulic external vibrators of series NHG are
equipped with gear motors. Hydraulic gear
motors do generally not require any
maintenance.
Changing the pressure fluid:
If only used for the vibration drives approx. 1000 operating hours.
With additional motors or cylinders approx. 500 – 800 operating hours, depending
on load.
Lubrication NHG 500(L), 600 R(L), 900 (L):
The bearings are lifetime lubricated. In case of
wear they must be replaced. If experiences
(speed dependent running time, cycle time,
temperature, impacts) are available a
preventive replacement may also be made.
Lubrication oil change in NHG 3000:
The NHG 3000 is fitted with oil mist lubricated
roller bearings. The lubrication oil inside the
NHG 3000 should be changed after approx.
1000 operating hours. At this occasion the
bearings should be checked and, if necessary,
replaced. Lubrication oil quantity for oil mist for
roller bearings approx. 0,15 litres of SAE 22.

13
Maintenance and repair on hydraulic external vibrators can be performed by
Netter GmbH.
During installation or other work on the
hydraulic external vibrator make sure that
the hydraulic unit is switched off and
secured against unintended switching on.
Check the fastening and the hose connections as well as the oil level
and the filter units on the hydraulic unit at regular intervals – ideally
every month.
When servicing the unit please observe the safety regulations.
Important: All maintenance work must be performed in a clean
and dust protected environment.
Avoid environmental hazards caused by hydraulic oils. When working
on hydraulic components avoid spillage of oil. Collect running out oil in
suitable vessels and return it for waste disposal (supplier).
9 Troubleshooting
Symptom Possible cause Corrective action
No power.
The eccentric housing
is filled with hydraulic
oil.
Premature wear on
motor shaft seal.
Too high pressures in tank or
leak oil line.
(See chapter 2 operating
pressure and temperature)
Replace the motor shaft
seal.
Too high speed, i.e. too high
flow volume.
(See chapter 2 Technical
Data)
Replace the motor shaft
seal.
Premature wear of the
vibrator bearing.
Too high speed, i.e. too high
flow volume.
(See chapter 2 Technical
Data)
Replace the bearings the
eccentric weight.

14
10 Spare Parts
When ordering spare parts please give the following details:
1. Order No.
2. Required quantity
3. Description and position of the spare part
4. Type of unit
11 Appendix
11.1 Accessories
The following accessories are available for the NHR vibrators (on request):
Description Remark
Flow control valve „static“
Limits the flow of pressure fluid to the permissible oil
requirement for the hydraulic external vibrator.
(Overload protection)
Flow control valve
„adjustable“ Speed regulation of the hydraulic external vibrator.
Way valves To switch hydraulic external vibrators on and off.
Duty/pause controls Setting of cycle times (duty and pause times) of
hydraulic external vibrators.
Safety suspension Clamp with steel rope and spring hook, see chapter 4,
page 6.
11.2 Disposal
Depending on the material, the parts must be disposed of according to regulations.
Material specifications:
• Housing,
NHG 500-900 ÞAluminium
NHG 3000 (0-series) ÞSteel
NHG 3000 (1-series) ÞGrey cast iron
• Eccentric, shaft, bearings, screws ÞSteel
• Hydraulic motors ÞSteel and aluminium
• Seals ÞPTFE, PU, VITON
• Flanges, covers ÞAluminium
All units can be disposed off through Netter GmbH.
The valid disposal prices are available on request.
11.3 Enclosures
Enclosure(s):
Declaration of manufacturer
Further information available on
request: Leaflet no. 3254 (NHG),
spare parts list and more.