Hydraulic Fluid Regulator: Service and Repair

REMOVING AND INSTALLING POWER FLOW REGULATOR
- With the engine stopped, discharge the hydraulic reservoir by operating the brake pedal about 20 times with the force required for full stop braking and Pull off wires on circulating pressure warning switch (5) and hydraulic pressure switch (6).





- Unscrew:
- pipe (1) from power flow regulator to tank
- pipe (2) from power flow regulator to power steering gear
- pipe (3) from power flow regulator to power steering pump
- pipe (4) from power flow regulator to brake booster





- Unscrew power flow regulator mounting bolts.

CAUTION: Fine particles of dirt in the system could impair the function of the power flow regulator, which in turn could lead to failure of hydraulic steering and braking support. Make sure that all pipes and hoses are clean before connecting.





Installation Note:
Tighten pipe (1) with Special Tool 34 3 154, pipes (2 and 4) with Special Tool 343 151 and pipe (3) with Special Tool 34 3 152, In each case, use special tools together with a torque wrench.

Tightening torque:
- Pipe (1) coupling of power flow regulator return to oil tank = 16 Nm (12 ft lb)
- Pipe (4) power flow regulator to brake booster = 31 Nm (23 ft lb)
- Expansion (2) hose from power flow regulator to steering gear = 50 Nm (37 ft lb)
- High pressure hose (3) from power flow regulator to power steering pump = 40 Nm (29.5 ft lb)
- Hydraulic switch (warning switch) to power flow regulator = 18 Nm (13 ft lb)

- Bleed H31 Hydraulic system. Service and Repair