Hofmann Geodyna 2350 User manual

Operation manual Car wheel balancer
geodyna 2350
Hofmann Werkstatt-Technik
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2Operation manual geodyna 2350 - 9413 126
Contents ·Safety rules and function
Contents Page
1. Safety rules and function 2.........................
2. Installation of the machine 5........................
3. Electrical connection 7.............................
4. Controls and displays 8............................
5. Turning on the machine 14.........................
6. Clamping the wheel 16.............................
7. Entry of balancing mode and wheel size 18...........
8. Balancing the wheel 28............................
9. Hidden spoke placement 32........................
10. Changing modes of operation 35....................
11. Error codes 42....................................
12. Pro-Match/weight minimisation 48...................
13. User calibration 59................................
14. Maintenance 60...................................
15. Technical data 60.................................
16. Electrical diagram 61..............................
1. Safety rules and function
1.1 Special hints for the reader
A few special features were used in this manual to facilitate
reading and understanding of pictures and written instructions:
warns the operator of injuries and damage
and names the consequences, if the operator does
not follow the instructions.
Dsignals the operator where to act.
Safety rules are highlighted in grey.
Arrow showing where to look
Arrow showing the direction to move
1.2 Scope of application
The off-the-vehicle wheel balancer is designed for static and/or
dynamic balancing of car and light-truck wheels weighing up to
150 lbs and having an overall diameter of 44”. An optional wheel
guard is available especially for balancing wheels with a rim di-
ameter of more than 20”, but not mandatory for wheels of less
than 20” rim diameter as the balancer has a maximum speed of
98 rpm only. With optional wheel guard the maximum wheel di-
ameter is reduced to 37”.
In addition to conventional balancing operations, irregular run-
ning conditions of the wheel caused by geometric deformations
of the rims and unbalances of the tires, hence unsmooth ride,
can be identified, improved or, if possible, even eliminated. By
exact adjustment of the two wheel components relative to each
other optimum wheel running conditions or at least balance
weight minimisation can be achieved.

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Operation manual geodyna 2350 - 9413 126
Safety rules and function
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geodyna
2350
HOFMANN
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Fig. 1 View of wheel balancer
Front view
1Function keys and display
2Weight tray
3Gauge arm for distance rim/machine
4Main arbor
5Pedal for main shaft lock
Rear view
6Power switch and line cord
1.3 General safety rules
Only properly trained and authorised personnel shall be al-
lowed to operate the wheel balancer.
The machine must not be used except for the scope of ap-
plication and in the way specified in this manual.
Unauthorised changes and modifications to the machine re-
lieve from any liability for damages and injuries that might re-
sult therefrom.
On no account should safety features be removed or made
inoperative.
In general any work on the electrical system such as fitting
of a plug or changing of connections, if necessary, must be
carried out by a qualified electrician in line with relevant
national standards and the regulations of the local power
station.
It should be noted that working with technical equipment
may involve an unforeseeable acceptable risk.
Therefore the operator should eliminate such dangers in ad-
vance by proper and wise behaviour.
The following special points should be observed:
Use technical equipment for its specified scope of applica-
tion only.
Always use suitable and proper equipment and tools.
Follow the instructions, notes and technical data of the ma-
chine manufacturer or manufacturer of the wheels to be bal-
anced.
Wear suitable protective clothing and accessories (e. g.
goggles, safety shoes, helmet).
For further safety rules to be observed, please refer to the
individual chapters.

4Operation manual geodyna 2350 - 9413 126
Safety rules and function
1.4 Description of function
Display and key pad
The display and key pad are arranged on the ergonomic front
panel.
Distance gauge arm
The distance between left correction plane and machine is de-
termined by means of an integrated gauge arm with scale. The
reading shown on the scale is also entered via the key pad in the
same way as for rim diameter and rim width.
Entry of rim diameter and rim width is via the key pad, whereby
the relative function key is held pressed while the wheel is ro-
tated to change the desired value. On releasing the key the
chosen input is stored.
The input range is identical with the working range of the ma-
chine (see §15. Technical data).
Balancing modes
Readings in different balancing modes (weight position on the
rim) can be given on the display, depending on the type of wheel
to be balanced (car, light truck, PAX, steel or alloy rim).
Measuring run and measured values
All measurements are taken and stored in one run during the
automatic program. On completion of measurement two aud-
ible signals are given.
Amounts and locations of unbalance are read out separately for
each correction plane.
Main shaft lock
The machine has a pedal-operated main shaft lock which is
used to retain the wheel in the correction position so that the
balance weights can be fitted. This lock is designed only to fa-
cilitate orientation of the wheel and must not be used for braking
the main shaft.
Store wheel profiles
Wheel profiles permit the storage of values for wheels that are
balanced frequently in order to save having to enter the wheel
data etc. each time. It is possible to store up to 4 wheel profiles.
Error codes
Errors in operation or failures in the electronic or mechanical
system are signalled via respective error codes (see §11.
Error codes).
Readjustment by the operator
If several measuring runs are necessary to balance a wheel be-
cause balance weight size and position have to be adjusted re-
peatedly, this is often due to insufficient measurement accu-
racy.
In such case the operator has the possibility of readjusting the
machine (see §13. User calibration).
Optional wheel guard
As the maximum speed of the wheel during balancing is below
100 rpm a wheel guard is not mandatory in Germany, however
an optional wheel guard can be supplied. With mounted wheel
guard, the electronic unit can be programmed via code C13 so
that measurement is started by closing of the guard.

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Operation manual geodyna 2350 - 9413 126
Installation of the machine
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2. Installation of the machine
When choosing the site, Health and Safety at Work regulations
and the regulations on working environment should be taken
into account.
The wheel balancers can be installed on any firm and level
ground. For the weight and space requirement of the machines
refer to §15. Technical data. For installation on an upper floor,
check and observe the permissible load capacity of the floor.
It is recommended, though not absolutely necessary, that the
machine be secured to the floor. For this purpose three holes
(Fig. 2) are provided in the base of the machine by which the
latter is fixed on the floor with 3/8”anchor bolts. Fig. 2 shows the
center-to-center distance of the holes. Make sure that the ma-
chine has a stable position, i.e. that it is supported on three
seatings. If not, ensure three-point contact on ground by insert-
ing appropriate spacers between the floor and machine base.
For transport the wheel balancer is provided with special pack-
ing (on pallet).
2.1 Unpacking the machine
The machine should be unpacked by two persons.
Note
When unpacking the machine make sure that the pedal fitted on
the machine base and the whole pedal assembly is not dam-
aged.
DCut the strips of the packing (Fig. 3, item 1), lift off the
packing and set aside the small parts packed in the sep-
arate small box (Fig.3,item2).
DUsea1/2”wrench to unscrew the three hexagon screws
which hold the machine on the pallet (Fig.4,arrows).
DLift the machine by tube of the vibratory system and turn
around by 180 degrees on the pallet (Fig. 4).
DThen lower one side of the machine laterally on the floor
(Fig. 5).
DRemove the pallet from underneath the machine and
gently lower the entire machine onto the floor (Fig. 6).

6Operation manual geodyna 2350 - 9413 126
Installation of the machine
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2.2 Fit (optional) wheel guard and holder
The holder for the optional wheel guard is fitted on the rear of
the wheel balancer, the wheel guard itself is fitted on the right of
the balancer.
DSwitch off the balancer.
DUndo the two M5 hexagon head screws and remove the
rear cover plate of the wheel balancer (Fig.7,arrow).
DFit the pre-assembled wheel guard holder (Fig. 8,
item 1) to the outside of the cabinet using the 4 hexagon
bolts M8.
DReach into the opening in the cabinet, pull out the lead
with plug located to the right ofthe opening and connectit
with the plug of the wheel guard switch.
DReplace the plug connector into the cabinet.
DStick the adhesive clip (Fig. 8, item 2) on the rear of the
cabinet in a central position relative to the wheel guard
holder and insert the connecting lead of the microswitch.
DFit the wheel guard spring (Fig.9,item1)into the spring
holder (Fig.9,item2).
DPass the holder for the wheel guard spring through the
opening, tilting it in the process, and then fit it verticallyso
that the recesses in the holder are located in the cabinet
panel.
DExtend the wheel guard spring and fit it into the bolt on
the wheel guard arbor (Fig.9,item3).
DSlide the wheel guard (Fig. 10, item 1) on the arbor and
raise it until the fastening holes of wheel guard and wheel
guard arbor coincide.
DInsert the M10 setscrew (Fig. 10, item 2) with washer
(Fig. 10, item 3) from below, and tighten the hexagon nut
(Fig. 10, item 4) and washer.
DTurn on the wheel balancer at the switch.
DCheck wheel guard switch for correct setting:
When the wheel guard is open the wheel guard switch must be
pressed. The balancer must not start.
DPlace the cover (Fig. 10, item 5) onto the holder for the
wheel guard arbor and fasten by means of tapping
screws.

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Operation manual geodyna 2350 - 9413 126
Installation of the machine ·Electrical
connection
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Correct the switch point of the wheel guard switch
If the measuring run is not started (preset with C13), check the
switch point as follows:
DUnscrew the cover from the holder of the wheel guard
arbor.
DUndo the setscrew on the switch ring (Fig. 11, item 1).
DAdjust the switch ring so that it is contacting the
tongue of the microswitch underneath (Fig 11, item 2)
and the measuring run is started on closing the guard
(Fig. 12).
DRe-tighten the setscrew.
DPlace the cover onto the holder for the wheel guard arbor
and tighten with tapping screws.
The optional wheel guard influences the following modes
of operation:
- The measuring run is started by closing the wheel guard
(code C13).
- The wheel is braked on lifting the wheel guard during a
measuring run (code C5).
These modes of operation can be changed either permanently,
or only as long as the machine is switched on, by means of
codes (see §10. Changing modes of operation).
3. Electrical connection
In general any work on the electrical system such as fitting of
a plug or changing of connections, if necessary, must be car-
ried out by a qualified electrician in line with relevant national
standards and the regulations of the local power station.
Electrical standard equipment and drive motor of the wheel ba-
lancer are provided for operation on 50/60 Hz, 100-120 V
(-15 %, +10 %).
The connecting cable of the machine is designed as a separate
power cord. For connection to the power mains the cable is pro-
vided with a NEMA 5-15P (U.S.) or C22.2 No. 42 (Canada)
plug.
Fusing is by the customer before the plug connector, using a
15 amp circuit breaker.
The electrical diagram is illustrated in §16.
The machine operates internally on a line voltage of 230 V be-
cause the voltage is regulated by an integrated transformer.

8Operation manual geodyna 2350 - 9413 126
Controls and displays
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4. Controls and displays
Fig. 13 Overview
1 START key
Start a measuring run
2 STOP key
- Interrupt the measuring run
- Delete an error code
- If input of a mode of operation is completed with
the STOP key, the new state is deselected
automatically and the former state is re-established.
3Function keys (see Fig. 14 to 16)
4Display (see Fig. 17 to 20)
Fig. 14 Function keys on the left
1Function key for distance rim / machine
2Function key for rim width
3Function key for rim diameter
Fig. 15 Function keys in the middle
4 PRO MATCH
- Starts an optimisation program (LED PRO MATCH
lights).
- In the Pro-Match program:
enter valve position.
5 CLEAR/RESTORE
CLEAR (key pressed briefly): Setting the factory adjusted
modes of operation. All settings are deleted and the display
returns to standard.
RESTORE (key pressed for 3 seconds): Restores all
modes the way they were before clear was pressed.
6 CALIBRATE/CODE
CALIBRATE (key pressed briefly): Sets the machine in the
user calibration mode (see §13. User calibration).
CODE (key pressed for 3 seconds): Switches to changing
modes of operation.
7G/OZ
Switches over the weight unit for unbalance readings
(grammes or ounces).
GReadings in grammes
Oz Readings in ounces
When the machine is switched on the weight unit set with
code C3 is active.

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Operation manual geodyna 2350 - 9413 126
Controls and displays
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16a
Fig. 16a Function keys on the right
8 ALU/ALU+ toggle key (ALU key) for balancing modes.
ALU (key pressed on top):
Toggles through the ALU and standard balancing modes.
While in any ALU mode the ALU status LED lights.
ALU+ (key pressed on bottom):
Sets the machine in the ALU+ mode. This enables the au-
tomatic distance gauge arm to measure first the left-hand
distance and then the righthand hidden weight. Pressing
this key disables one-plane and patch balancing and en-
ables only hidden weight balancing.
First push: Enables lefthand hammer-on weight and
lights lefthand hammer-on LED for balanc-
ing mode ALU 3P in wheel position display.
Second push: Enables lefthand adhesive weight and lights
lefthand adhesive weight LED for balancing
mode ALU 2P.
Third push: Returns to standard balancing.
9 SPOKE/OPERATOR
SPOKE: Enters the number of spokes for the hidden spoke
placement mode.
Keep the key pressed on top and rotate the wheel to set, or
change, the number of spokes.
When the key is pressed without rotating the wheel, the
current setting is entered.
OPERATOR: Recalls and stores wheel profiles.
RCL: Keep the key pressed on bottom. RCL (recall)
comes up in the left-hand section of the display and 1
comes up in the right-hand section for the first wheel
profile to be stored.
Keep the key pressed on bottom and rotate the wheel.
Profiles 2 through 4 are read out in the right-hand dis-
play. The stored wheel profile is entered once the key is
released.
STO: If a wheel profile is to be stored, keep on pressing
the key after the rcl readings have come up and continue
rotating the wheel. Now STO (store) comes up in the
left-hand display, and#1through 4 can be set in the
right-hand display by rotating the wheel. The current
profile is stored once the key is released.
10 RV-S/D
RV (key pressed on top):
Changes the fine resolution to increments for RV/Light
truck.
- Switches resolution to 2 instead of 1/4 ounce.
- Switches suppression minor unbalance readings to a
selectable value (using service code).
Readouts stay in RV mode until deselected by pressing the
key again.
S/D (key pressed on bottom):
- Function key to select display of dynamic or static
unbalance (S/D key).

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Controls and displays
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Fig. 16b Function keys on the right
11 FINE/INT
FINE (pressed on top):
- Show amount reading with higher resolution:
1 gramme instead of 5 grammes or 0.05 oz instead of
0.25 oz (only for as long as the key is pressed)
- Display residual wheel unbalance below the threshold
for suppression of minor unbalance readings:
As long as the key is pressed the suppression of minor
unbalance readings is switched off and the actual unbal-
ance in the wheel is read out.
- Display unbalance for standard balancing mode:
if balancing mode Alu 1 to Alu 5 is selected, press and
hold the FINE key and then press the function key for
balancing mode (ALU, ALU+). The unbalance readings
switch over to those for standard balancing mode and
the relative rim symbol appears.
- In the OP and Un programs the FINE key serves as
change-over key.
INT (pressed on bottom):
Switches to the patch balance mode.
All wheel data must have been entered. In addition the
height-to-width ratio specified on the tire has to be en-
tered by pressing the diameter key and rotating the
wheel.
Readout display changes to single-plane. Both location
displays are active and work in parallel. Distance and di-
ameter dimensions have no effect and are preset to
nominal values. All special functions are inactive and
cannot be selected.