Preparation for Test

1. Check oil level in oil reservoir, correct if necessary. 2. Model 129 Unscrew connecting rods (54, 55) at front and rear leveling valve levers (set levers to neutral position). Model 140 Unscrew connecting rod at leveling valve lever (3a). 3. Depressurize rear axle hydraulic system by slowly opening bleeder screw (3p). Connect drain hose and place into container. 4. Connect test gauge (038a) to rear axle leveling valve bleeder screw (S2). 5. Model 129 Set both leveling valve levers to position "F" (fill). 6. Model 129 Open pressure supply screw (50a) by maximum of 1 turn. 7. Disconnect return line (T) at oil reservoir (2) and using a suitable hose, hold it in a measuring glass. To perform this rest, the oil fill quantity must be increased by 0.5 liters. If the oil reservoir was empty, the hydraulic oil pump must first be bled by disconnecting the high pressure flexible hose at the steel line. Run the engine and hold the hose into a container until the oil exits free of bubbles.

Test step	Test scope	Test connection	Test condition	Nominal value	Possible cause/Remedy 1)
1.0	Delivery pressure WARNING! High pressure	250 bar Connect test gague to rear axle leveling valve connection S2	Engine: at Idle Set leveling valve lever(s) to position "F" (fill). Observe test gauge needle until pressure no longer increases.	> 133 bar Delivery capacity at idle > 0.2 l/min.	Delivery pressure < 133 bar, Delivery capacity < 0.2 l/min: Replace hydraulic oil pressure pump (SMS, Job No. 32-640) Delivery pressure < 133 bar, Delivery capacity > 0.2 l/min: see 34

1) Observe Preparation for Test, see 22.