Fluid Pressure - Power Steering Pump, Check (Diesel Engines) Notice: If power steering malfunctions, it is often not immediately possible to tell if steering gear or power steering pump is faulty. Use Oil Pressure Gauge KM-354-B to check oil pressure.
 Install, Connect Connect Fluid Pressure Gauge KM-354-B to pressure line with KM-354-3 (1) and to power steering pump delivery connection (2). For X 17 DT with AC: Attach Adapter KM-903 to power steering pump. | 
|
 Remove, Disconnect For X 20 DTL, X 20 DTH, Y 20 DTH and Y 22 DTR: Remove relay box and air cleaner housing. Bolt Adapter KM-903-10 (1) into power steering pump. Attach the second Adapter KM-903 (2) to the screwed-in adapter and attach the Fluid Pressure Gauge KM-354-B (3) here. Connect the removed pressure line (4) to the fluid pressure gauge (6) with one of the two Adapters KM-354-3 (5) and the banjo bolt.
 Important! Fluid escapes - place collecting basin underneath. Top up fluid before pressure test. | 
|
 Inspect Start engine. In steering mid-position and with shut-off valve open, the pressure gauge indicates a pressure (at operating temperature) of approx. 2 to 5 bar. On turning steering wheel to the left or right, the pressure increases and reaches its maximum value just before the respective end stop - see "Technical Data". A slight difference in pressure between the left and right end stop has no significance.
Important! Never hold steering gear at full lock for longer than 10 seconds.
 Measure Read off exact maximum pressure with measurement gauge shut-off valve open (KM-354-B) and with steering wheel turned to right or left stop. Then close shut-off valve, steering in mid-position, and read off maximum pressure.
Important! When shut-off valve is closed, pump continues operating with maximum pressure. Close shut-off valve for short periods of time only, while reading off manometer simultaneously (10 seconds maximum). Perform three measurements. Average value indicates maximum pressure. If maximum pressure with shut-off valve closed is noticeably greater than at steering wheel stop: faulty steering gear hydraulics. If maximum pressure with shut-off valve closed is less than that given in Technical Data: faulty fluid pump.
Remove, Disconnect Remove Fluid Pressure Gauge KM-354-B and Adapter KM-354-3. For X 17 DT with AC: Remove Adapter KM-903 from power steering pump. For X 20 DTL, X 20 DTH, Y 20 DTH and Y 22 DTR: in addition, remove Adapter KM-903 and KM-903-10.
Install, Connect Attach pressure line with new seal rings to power steering pump - tightening torque for X 17 DT: 28 Nm / 21 lbf. ft., for X 20 DTL, X 20 DTH, Y 20 DTH and Y 22 DTR: 37.5 Nm / 28 lbf. ft.
Inspect Charge and bleed hydraulic system - see operation "Hydraulic System, Charge and Bleed".
|
