Hydraulic Pump Supply Pressure, Checking, 100 And A6

-- Install hose clamps, Snap-On Model YA2850 or equivalent, on suction and pressure hoses.

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-- Press spring clamp and disconnect harness connector from fuel injector.

Fig 1: Removing Line From Pressure Hose

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-- Tightly hold hex fitting on flexible pressure hose, and disconnect threaded connection (arrow).

-- Install adapter US 1074/4C in the line in place of pressure hose.

Fig 2: Identifying Adapter V. A. G 1402/3

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-- Install hose of pressure gauge US 1074 on adapter US 1074/4C.

Fig 3: Screwing Power Steering Test Unit V. A. G 1402 Onto Adapter V. A. G 1402/3

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-- Close locking valve of gauge (lever to left).

-- Install connector on fuel injector.

-- Remove hose clamps from suction and pressure hoses.

-- Start engine.

-- At idle, read pump pressure on gauge.

Measurement must last no longer than 10 seconds.

Specified value: 120-130 bar (1740-1885 psi)

-- Stop engine (switch ignition off).

NOTE:

If specified value is not obtained, replace hydraulic pump.

-- Install hose clamp on suction and pressure hose.

-- Disconnect harness connector from fuel injector.

-- Remove pressure gauge hose from adapter and put gauge aside.

-- Take adapter off pressure line.

-- Connect pressure hose to line by holding pressure hose hex.

-- Install connector on fuel injector.

-- Remove hose clamps from pressure and suction hoses.

-- Let engine idle for approx. 2 minutes with front wheels pointed straight ahead.

-- Stop engine (switch ignition off) and immediately check power steering fluid level, noting marks on reservoir or dipstick, if necessary top off to MAX mark.

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-- Check steering system for leaks.