Diagnostic Manual, Chassis and Drivetrain,
Hydraulic Test Program - Leveling Valve Pressure Test
Preparation for Test
|1. Depressurize rear axle hydraulic system by slowly opening bleed screw (57a).
2. Connect test gauge (038) with hose (038e) to distribution fitting (57) in place of bleed screw (57a).
3. Check oil level in oil reservoir, correct if necessary.
4. Connect HHT (refer to section 0).
Monitor oil level during testing, air must not be allowed to enter the system through the hydraulic pump.
| 250 bar at rear axle distribution fitting
||Engine: at Idle
HHT activation: raise
HHT activation: lower
|180 - 190 bar
33-36 bar after 5 min.
|Delivery pressure > 190 bar Replace leveling valve.
Delivery pressure < 180 bar
Hydraulic pump test 32.
Replace leveling valve.