freightliner M2 Plus 2023 Manual page 259

8. Attempt to start the engine of the vehicle with the
batteries receiving the charge. Do not operate
the starter longer than 30 seconds, and wait at
least two minutes between starting attempts to
allow the starter to cool.
9. When the engine starts, let it idle a few minutes.
WARNING
Do the next step exactly as instructed and do not
allow the clamps of one cable to touch the
clamps of the other cable. Otherwise, a spark
could occur near a battery, possibly resulting in
severe personal injury from explosion or acid
burns.
10. Disconnect the negative (grounded) jumper cable
from the vehicle that needed the jump start. See
Fig. 23.4, ref. B.
11. Then disconnect the other end of the jumper
cable from the vehicle that provided the jump
start.
12.
Disconnect the positive jumper cable from the
positive battery or jump start post of the vehicle
that provided the jump start.
13. Then disconnect the other end of the positive
jumper cable from the positive battery or jump
start post of the vehicle that received the jump
start. See Fig. 23.4, ref. A.
14. Install the battery box cover; be sure it is
positioned properly before fastening the latches.
Raising and Lowering a
Vehicle
Raising a Vehicle with Air Suspension
1. Park the vehicle on a level surface, set the
parking brakes, and shut down the engine.
Chock the tires.
WARNING
Remove the air from the suspension. Failure to
remove the air from the suspension may cause
the vehicle to move or shift on the jack stands as
air pressure drains from the system; this could
cause the vehicle to fall, resulting in damage to
the vehicle, serious injury, or death.
2. Exhaust all air from the air suspension.
In an Emergency
WARNING
Do not use bottle jacks to raise the vehicle.
Always use floor jacks. Bottle jacks can slip,
allowing the vehicle to fall, which could result in
damage to the vehicle, serious injury, or death.
IMPORTANT: Only lift unloaded vehicles and
vehicles disconnected from trailers. Unload
vehicles with bodies (drilling rigs, mixers) as
much as possible.
3. Place a floor jack under the axle housing, the
clamp group, or the frame rail.
NOTICE
NOTICE: Do not place jack stands under any of
the suspension components; doing so could
cause suspension component damage. Jack
stands can be placed at any point below the axle,
including the differential area.
4. Raise the vehicle. Add additional jack stands, as
needed, under the axles to support the vehicle.
Lowering a Vehicle with Air
Suspension
WARNING
Do not use bottle jacks to raise the vehicle.
Always use floor jacks. Bottle jacks can slip,
allowing the vehicle to fall, which could result in
damage to the vehicle, serious injury, or death.
NOTICE
NOTICE: Do not place jack stands under any of
the suspension components; doing so could
cause suspension component damage. Jack
stands can be placed at any point below the axle,
including the differential area.
1. Using the floor jack, raise the vehicle to remove
any jack stands used to support the vehicle.
2. Slowly lower the vehicle to the ground.
3. Inflate the air suspension, and check for proper
operation.
23.4