Diagnostic Manual, Chassis and Drivetrain,
Volume 1
Hydraulic Test Program - Leveling Valve Pressure Test
Preparation for Test
1. Check oil level in oil reservoir, correct if necessary.
2. Unscrew connecting rod at leveling valve levers
(set levers to neutral position).
3. Depressurize hydraulic system by slowly opening bleeder screw (3p), connect drain hose and place into container, remove bleeder screw (3p).
4. Connect test gauge to leveling valve connection (S2).
|
 |
|
Test scope |
Test connection |
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
|
Opening pressure of relief valve
 WARNING!
High Pressure |
 250
Connect test gauge to S2. |
Engine: at Idle
Set leveling valve lever to "F" (fill). |
120 - 153 bar |
> 153 bar
Replace leveling valve.
< 120 bar
Replace hydraulic oil pump, see
 32
|
| 2.0 |
|
Overflow valve function |
250
Connect test gauge to S2. |
Engine: at Idle
Set leveling valve lever to "F" (fill) until gauge indicates approximately 80 bar.
Set leveling valve lever to "L" (empty)
|
30 - 36 bar |
Rear axle,
Replace leveling valve.
|
|
Printable version
