Testing pressure at rear axle level controller - AR32.30-P-0530A: Notes

MODEL 140, 210 with CODE (217a) Self-levelling suspension on rear axle with ADS with CODE (480) Level control system at rear 

MODEL 202, 203.2, 208 with CODE (480) Level control system at rear 

Fig 1: Identifying Pressure At Rear Axle Level Controller (Layout Of Suspension-Control Module On Model Series 140, 202, 208, 210)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Identifying Pressure At Rear Axle Level Controller (Layout Of Suspension-Control Module On Model Series 203.2)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Removing
	Risk of injury  to skin or eyes from hydraulic fluid spraying out under pressure. Risk of poisoning  from swallowing hydraulic fluid.	Render the hydraulic system pressureless before commencing work on system. Wear protective clothing and eye protection.	AS00.00-Z-0013-01A
1	Drain hydraulic system		AR32.30-P-0630A
	General notes for working on vehicles with level control/ADS	All models with Code 216b, 216c, 217a, 480	AH32.00-P-0002-01A
	Inspecting
2	Connect tester to level controller		AR32.30-P-0530-01A
3	Fill the reservoir with fluid (2)	Raise the fluid level to approximately 0.5 liters above the MAX graduation (a) on the dipstick (2a) for the test.
		Funnel	Figure
		Models 140, 202, 208 Fluid conforming to criteria found in Specifications for Service Products	BB00.40-P-0343-00A
		Model Series 210, 203.2 Fluid conforming to criteria found in Specifications for Service Products	BB00.40-P-0344-00A
	Risk of accident  from vehicle starting off by itself when engine running. Risk of injury  from contusions and burns if you insert your hands into the engine when it is started or when it is running	Secure vehicle to prevent it from moving off by itself. Wear closed and close-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
4	Start engine and allow to idle	4
5	Press suspension-control module lever to position "fill" (F)
6	Check the release pressure of the bypass valve in the hydraulic suspension-control module Note release pressure indicated by gauge.	Because the pressures are considerable, keep test as brief as possible. Ensure that the reservoir contains sufficient fluid. Never let the pump suck air.
		The suspension-control module's bypass valve limits the supply pressure of the hydraulic pump. The bypass valve emits a whistling noise as it opens ↓
		Bypass valve release pressure	*BE32.30-P-1001-03A
7	Set level controller lever to "Empty" position (L).
8	Switch off engine
9	Check base pressure of discharge valve in hydraulic suspension-control module Read base pressure on pressure gauge.	Leave tester connected. The system should reach base pressure after no more than a maximum of 3 minutes.	*BE32.30-P-1002-03A
10	Allow the system to settle for approximately 5 minutes, then read the base pressure again.	The base pressure should not drop during this period with the system in its passive state. If pressure falls ↓	*BE32.30-P-1002-03A
		Replace the suspension-control module.	AR32.30-P-0670A
	Installing
	Risk of injury  to skin or eyes from hydraulic fluid spraying out under pressure. Risk of poisoning  from swallowing hydraulic fluid.	Render the hydraulic system pressureless before commencing work on system. Wear protective clothing and eye protection.	AS00.00-Z-0013-01A
11	Disconnect tester at level controller		AR32.30-P-0530-01A
12	Recharge hydraulic system		AR32.30-P-0630A

Rear axle level controller

Rear axle level controller

Rear axle level controller

Fig 3: Identifying Tester (126 589 14 21 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 4: Identifying Funnel (126 589 12 63 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.