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4.2 Automatic Locking Differential (ASD)   >   33 Hydraulic Test Program - Test

Test step Test scope Test connection Test condition Nominal value Possible cause/Remedy 1.0 ASD w/o pressure reservoir only Pressure test 250 bar at ring cylinder Engine: at Idle 50 - 63 bar Inspect hydraulic oil pump; SMS Job No. 32-0530, Hydraulic unit, Hydraulic oil pump. 2.0 ASD with pressure reservoir only Gas pressure in pressure reservoir 250 bar at test connection (M) or pressure release screw (83c) on hydraulic unit Engine: at Idle System depressurized. Rapid pressure buildup up to 22 bar followed by slow buildup up to 33 bar. If rapid pressure buildup stops at 10 bar, replace pressure reservoir. 3.0 ASD with pressure reservoir only Pressure test 250 bar at test connection (M) or pressure release screw (83c) on hydraulic unit Engine: at Idle 27 - 33 bar Pressure < 27 bar: 3.2 32 1.0 Pressure > 38 bar: Replace hydraulic unit.