Steering Gear Case Construction; P/S Pump Construction - Suzuki GRAND VITARA Owner's Manual

6C-2 Power Assisted Steering System:

Steering Gear Case Construction

The steering gear case consists of two sections: one
including a cylinder and the other a valve. Main
components of the cylinder section are a gear case (7), a
rack (8) and a tube and those of the valve section are a
valve case (10), a sleeve (4) and a stub shaft (2). The
sleeve is linked with the pinion (6) through a pin (1) and
the valve and stub shaft are integrated into one unit.
Then the pinion and the stub shaft are linked to each
other by means of the torsion bar (3).
Thus, when the stub shaft moves, the valve changes its
position, thereby switching the hydraulic passage from
the pump to the cylinder to help steering operation.
When turning the steering wheel feels heavy due to P/S
fluid leakage or for some other reason (i.e., when in the
manual steering mode), the stub shaft and pinion are in
direct linkage and the force is output directly through the
pinion and rack.

P/S Pump Construction

The power steering pump is a vane type and is driven by the V-ribbed belt from the crankshaft.
Power steering (P/S) pump specifications
Model
Relieved
Hydraulic pressure
pressure
control
Control device
Power steering pressure switch
Flow Control Valve (Relief Valve)
As the discharge rate of the P/S pump increases in proportion to the pump revolution speed, a flow control valve is
added to control it so that the optimum amount of fluid for steering operation is supplied according to the engine speed
(driving condition).
S5JB0A6301002
6370 kPa (63.7 kg/cm 2 , 906 psi) for M16 engine
6860 kPa (68.6 kg/cm 2 , 975 psi) for J20 engine
Flow control valve and relief valve
Switch turns on (closes) when the pressure is higher than 2500 –
3000 kPa (25 – 30 kg/cm
ECM uses this signal for idle speed control.
1
2
3
4
7
5. Bearing 9. Ferrule
Vane type
2 , 356 – 427 psi).
9
10
5
6
8
I5JB0A630002-01
S5JB0A6301003