2. Make sure the parking brake is fully engaged.
3. Disconnect the supply lines:
■ Disconnect the lighting and signaling cable.
■ Disconnect the ABS cable and plug into the appropriate "parking socket".
■ Disconnect the hoses of the brake line and attach their coupling heads to the dummy cou‐
pling of the towing bar.
─ first supply line (red)
─ then brake line (yellow)
4. Prepare the jockey wheel for parking (see Ill. 97, Figure a).
■ Lift the jockey wheel and unhinge the fixing lever.
■ Pivot the jockey wheel downward.
■ Check whether the fixing lever touches the support pipe.
■ Lower the jockey wheel until the towing mechanism is stress-free.
5. Place chocks under the wheels.
6. Open the towing coupling of the towing vehicle.
7. Slowly forward the towing vehicle to separate from the parked machine.
12.2.3.2 Parking the machine (chassis axle load 7716 lb)
The towing mechanism of the machine is fitted with an "automatic jockey wheel".
In a parked machine which is separated from the towing vehicle, the machine's bearing load
affects the jockey wheel.
For this reason, the jockey wheel of a separated machine must be wound down until the
cam
2
no longer touches the bead
1
. The automatic folding of the wheel suspension is
thus blocked (see Ill. 105, figure a).
When the jockey wheel of a separated machine is wound up further, the bead pushes
against the cam of the retaining pin (see Ill. 105, figure b). The retaining pin
3
unlocks the
wheel suspension
4
which will abruptly fold (see Ill. 105, figure c), and drop the towing
mechanism to the ground.
A folding wheel suspension during winding up causes the towing device to suddenly crash
onto the ground,
potentially causing severe injuries to legs and/or feet.
➤ The operator must ensure that only authorised personnel has access to the machine.
➤ Wind the automatic jockey wheel only up when the machine is coupled to a towing vehi‐
cle.
➤ Wind the automatic jockey wheel up only as far as the bead does not touch the cam.
➤ Do not place your feet beneath the towing device.
12 Decommissioning, Storage and Transport
12.2 Transport
272
Operator Manual Screw Compressor
M250 SIGMA CONTROL MOBIL
No.: 9_9570 07 USE