CARE AND MAINTENANCE 7
MHL380 D 7.3
7.3 Discharging residual pressure in the
hydraulic circuit
Danger of injury due to residual
energy
• When performing maintenance
and repair work on the hydraulic
system, the residual pressure in
the hydraulic circuit must be dis-
charged.
• Before performing this task, the
loading equipment must be safely
lowered to the ground.
In an emergency: Administer first
aid, seek treatment from a doctor
The ignition must be switched on (ignition key in
position I). The left armrest (155/13) must be
folded down and the maintenance ladder closed.
Travel and work functions must be enabled
(control light on button toggle (155/79) must light
up). The "Travel and work functions disabled"
indicator (155/46) must not light up.
The following must be performed at least five
times to also relieve the control pressure:
1) Lower the four-way control levers (155/12)
and (155/20), lower the loading equip-
ment, slew the uppercarriage, open/close
the grab.
2) Service brake pedal (155/16) (press 20
times).
3) Pushbutton (155/65) for parking brake
4) Pushbutton (155/66) for swing brake
5) Accelerator pedals (155/17) and (155/18)
6) Emergency lowering function (155/10) or
(106/1) for cab lift
7) Lever (155/11) to extend/retract 4-point
outrigger
8) Pushbutton (155/2) and (155/3) for grab
rotation right/left
9) Pushbutton (155/78) for oscillating axle
lock release
MHL-NBXX-612
13
12
11
10
16 17 18
20
65
66
79
46
3
2
Fig. 155 Discharging residual pressure
Dischar
ging
residual
pressur
e in the
hydrauli
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