Checking hydraulic pump - AR32.30-P-0510A

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

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

Fig 1: Identifying Hydraulic Pump Components (Model Series 140, 202, 208)

Fig 2: Identifying Hydraulic Pump Components (Model Series 210)

Fig 3: Identifying Hydraulic Pump Components (Model 203.2)

	Removing
1.1	Disconnect return line (T) from fluid reservoir (2) Connect one end of the drain hose to the return line (T) and place the other end in the graduated container	Model Series 140, 202, 208, 203.2 To measure the hydraulic pump's supply rate.
		Ensure that hoses are routed securely. When the bypass valve in the suspension-control module opens the fluid pressure in the return line rises to approximately 2 bar.
1.2	Use clamp to close return line (T). Connect drain hose (061) to the return line (T) and place the other end in a graduated container (The engine compartment cover has been removed at this juncture)	Model 210 To measure the hydraulic pump's supply rate. Ensure that hoses are routed securely. When the bypass valve in the suspension-control module opens the fluid pressure in the return line rises to approximately 2 bar.
		Clamp	Fig 6
2	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 Start engine and allow to idle	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
3	Checking delivery rate of pressure oil pump Route hose attached to return line (T) into a suitable graduated container	Ensure that the reservoir contains sufficient fluid. Never let the pump suck air. If supply rate is below ↓	*BE32.30-P-1002-02A
		Replace hydraulic/tandem pump	AR46.30-P-0500A
4	Switch off engine
5.1	Connect return line (T) to fluid reservoir (2)	Model Series 140, 202, 203.2, 208
5.2	Connect hose to return line (T)	Model 210
	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
6	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
7	Connect tester to suspension-control module (3)		AR32.30-P-0530-01A
8	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	Fig 5
		Models 140, 202, 208 Fluid conforming to specifications found in Specifications for Service Products	BB00.40-P-0343-00A
		Model Series 203.2, 210 Fluid conforming to specifications 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
9	Start engine and allow to idle
10	Press suspension-control module lever (3a) to "fill" (F) position.
11	Check hydraulic pump supply rate	Because the pressures are considerable, keep the test as brief as possible. 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
		if the bypass valve's opening pressure is substantially lower than specification ↓ and supply rate at idle	*BE32.30-P-1002-02A
		Replace hydraulic/tandem pump	AR46.30-P-0500A
		if the bypass valve's opening pressure is substantially higher than specification check rear suspension-control module	AR32.30-P-0520A
12	Set level controller lever to center position
	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
13	Disconnect tester at level controller		AR32.30-P-0530-01A
14	Recharge hydraulic system		AR32.30-P-0630A

Rear axle level controller

Rear axle level controller

Rear axle level controller

Fig 4: Identifying Tester (126 589 14 21 00)

Fig 5: Identifying Funnel (126 589 12 63 00)

Fig 6: Identifying Clamp (000 589 40 37 00)