Checking level control pressure oil pump - AR32.31-P-0510A: Notes

MODEL 129 with CODE (216c) Adaptive damping system (ADS II) with electronic level control 

Fig 1: Checking Level Control Pressure Oil Pump

	Removal
	Risk of injury  to skin or eyes due to hydraulic fluid spraying out under high pressure. Risk of poisoning  due to consuming hydraulic fluid.	Before starting work on the hydraulic system, depressurize the system. Wear protective clothing and safety glasses.	AS00.00-Z-0013-01A
1	Empty pressure oil system at rear axle Testing		AR32.31-P-0630A
2	Connect tester to rear axle connecting piece (57)	Danger due to oil spraying out!	AR32.31-P-0510-01A
3	Pour oil into oil reservoir (2)	For testing, increase the quantity of oil to approx. 0.5 liters above the "max." marking (a) on the oil dipstick (2a).
		Funnel Oil in accordance with Specifications for Service Products, sheet 343	Fig 3
4	Disconnect return (flow) line (T) at oil reservoir (2), connect oil drain hose (061) to the return (flow) line (T) and guide into oil reservoir (2)	To measure the delivery rate of the pressure oil pump. Pay attention to secure hose routing. When the pressure relief valve in the valve unit opens, the oil pressure in the return (flow) line increases to approx. 2bar.
5	Connect Hand-Held Tester (089) with test cable (094) to data link connector (X11/4)		AD00.00-P-1000AZ
	Risk of accident  due to vehicle starting off automatically when engine is running. Risk of injury  due to being trapped and burns when intervening while starting the engine or when the engine is running.	Secure vehicle to prevent it from starting off automatically. Wear close-fitting, tight clothing Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
6	Start engine and allow to idle.
7	Hand-Held Tester (089) in "lift" position
8	Checking output of pressure oil pump	Only carry out the test briefly due to the high pressures. The delivery pressure of the pressure oil pump is limited by the bypass valve in the valve unit. Opening pressure of bypass valve	*BE32.31-P-1001-02A
		if the opening pressure of the pressure relief valve is clearly not achieved? ↓ and output at idle speed	*BE32.30-P-1002-02A
		Replace pressure oil pump/tandem pump	AR46.30-P-0500A
		Insufficient pressure at optimum delivery rate? ↓ Replace valve unit	AR32.31-P-0650A
9	Checking delivery rate of pressure oil pump	Ensure that there is sufficient oil in the oil reservoir. The pump must not draw in air under any circumstances.	*BE32.30-P-1002-02A
	Connect oil drain hose (061) to the return (flow) line (T) in a measuring vessel	When the delivery rate is not achieved? ↓ Replace pressure oil pump/tandem pump	AR46.30-P-0500A
		When the delivery rate is exceeded? ↓ and output is not achieved at idle speed? ↓	*BE32.30-P-1002-02A
		Replace valve unit	AR32.31-P-0650A
10	Switch off engine
	Installation
11	Disconnect Hand-Held Tester with test cable		AD00.00-P-1000AZ
	Risk of injury  to skin or eyes due to hydraulic fluid spraying out under high pressure. Risk of poisoning  due to consuming hydraulic fluid.	Before starting work on the hydraulic system, depressurize the system. Wear protective clothing and safety glasses.	AS00.00-Z-0013-01A
12	Disconnect tester on distributor fitting (57)		AR32.31-P-0510-01A
			*BA32.31-P-1001-01A
13	Connect return (flow) line (T) to oil reservoir (2)
14	Fill pressure oil system at front and rear axle	The front axle is also filled at the same time	AR32.31-P-0630A

DISTRIBUTOR FITTING

Fig 2: Identifying Tester (126 589 14 21 00)

Fig 3: Identifying Funnel (126 589 12 63 00)