Connecting the battery jumper cables
1.
Clamp the first terminal clamp 3
of the red jumper cable to the positive pole of the engine's
battery.
2.
Clamp the second terminal clamp 2
of the red jumper cable to the positive pole of the assist‐
ing vehicle's battery.
3. DANGER!
Explosion hazard!
A spark may ignite an explosive gas mixture.
➤
Do not, under any circumstances, connect the negative pole of the assisting machine to
the negative pole of the battery in the machine to be started.
This can cause sparks when connecting and disconnecting the pole clamps of the jumper
cable.
➤ Work with caution.
4. Connect the first pole clamp 4
of the black jumper cable to the engine block or a connected,
solid and unpainted metal component of the engine 5 (as distant as possible to the batteries).
5.
Clamp the second terminal clamp 1
of the black jumper cable to the negative pole of the as‐
sisting vehicle's battery.
Starting the engine
1.
Start the engine of the assisting vehicle and run at high speed.
2. Start the compressor engine.
Upon a successful start, run both engines run for approximately 10 – 15 minutes.
This is important, in particular for fully discharged batteries. They will pick up little current only
in the beginning and have a high internal resistance. Any voltage peaks occuring in the en‐
gine generator in this state can be attentuated only by the batteries of the assisting vehicle.
The engine electronics in particular, of the machine is sensitive to overvoltages and could be
damaged easily.
Disconnecting the battery jumper cables
1.
Stop the engine of the assisting vehicle.
2. Disconnect the jumper cables in the reverse order, first negative (-) then positive (+).
3. Place the pole caps.
4. Close the maintenance panels and/or bonnet.
A stop of the compressor engine as soon as the cables are disconnected could indicate ma‐
jor damage to the alternator or batteries to be repaired by a specialised workshop.
7.4.2 Option ba, bb
Starting up low-temperature equipment
➤ Ascertain which low temperature equipment is fitted to the machine.
7 Initial Start-up
7.4 Low-temperature operation (winter)
No.: 9_6974 20 E
Service manual Portable compressor
M122
61
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