2013 SSANGYONG NEW ACTYON SPORTS power steering

12-20
Measure the oil pressure with the gauge valve
fully open. 7.
Pressure at no load
3 to 5 bar
If the pump pressure is in specified range, the
pump is normal. If not, replace the power
steering pump 8.
Turn the steering wheel right or left until it
stops with the engine idling and valve fully
open. 9.
Oil pressure78 to 83 bar
To prevent the internal damage, do not close
the gauge valve for over 10 seconds.
Keep the oil temperature at proper range. -
-

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1. SYSTEM DESCRIPTION
The power steering has been designed to make the wheel move more easily than in a manual steering
system. The hydraulic power assists the process utilizing hydraulic fluid. The fluid increases pressure in
the power steering pump and aids the movement of the steering mechanism. The power steering
system consists of pump, oil reservoir, rack and gear box. The power steering pump is a vane type and
delivers hydraulic pressure to operate the power steering system. The pressure relief valve in the pump
controls the discharging pressure. The rotary valve in the rack and the pinion gear directs the oil from the
power steering pump to one side of the rack piston. The integrated rack piston converts the hydraulic
pressure to linear movement. The operating force of the rack moves the wheels through the tie rod, the
tie rod end and the steering knuckle. Even though the hydraulic pressure cannot be generated, a driver
can steer the vehicle without power assist but it needs very high steering force. In this case, the
operating force of the steering wheel is conveyed to the pinion, and the movement of the pinion moves
the rack through the pinion gear combined to the rack gear.

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2. SYSTEM LAYOUT
The steering pump is driven by the engine power through a belt. This pump circulates the power steering
oil from the reservoir -> steering pump -> oil supply pipe -> steering gear box -> oil return pipe ->
reservoir to perform steering operations
Return hose & tube
Steering pump &
reservoir
High pressure hose
Linkage gear box Steering wheel
Lower shaft Column & shaft
Return hose & tube
Steering pump &
reservoir
High pressure hose
Linkage gear box Steering wheel
Lower shaft Column & shaft
HPS model
SSPS model

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1. SPECIFICATIONS
Item Item Specification
SSPS solenoid valveRated voltage DC 12 V
Rated voltage 1.0 A
Resistance6.7 ±1 Ω
Power steering oil pump
(with SSPS)Operating temperature-40℃~150℃
Release pressure 90 bar
Displacement 9.3 cc/rev
Flow velocity 9.75~6 l/mn
Pulley sizeØ115
Pulley type 6 groove
Housing material Aluminium
Power steering fluid reservoir
(with SSPS)Fracture pressuremin 8kgf/㎠
Air leakage2 kgf/㎠×min
Cap open torque 9.8 to 14.2 Nm
Oil capacity FULL 550cc
Power steering gear box
(with SSPS)Gear type Rack & pinion type
Gear ratio 40.245
Fixed rack 3.78
Gear weight 12.800 kg
Steering angleInner36.2°
Outer32.4°

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1. OVERVIEW
The speed-sensitive power-assisted steering system can automatically adjust the boosts according to
the speed changes, automatically induct the high-speed or low-speed status, and relatively adjust the
reasonable steering boosts, enhance the operation precision, reduce the driving pressure of drivers. No
matter for steering, parking or reversing, it becomes much easier. The adjustable safety steering column
attached possesses the functions of electrically adjusting height and transverse position, has brought
much more abundant and comfortable spaces for legs, and has provided the great convenience to get in
or out the car.
The Speed Sensitive Power Steering (SSPS) unit controls the SSPS solenoid vale in steering gear box
to get proper power steering force.

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Power steering gearbox &
solenoid valve for SSPS model
SSPS control unit
Installed view Unit components
It is installed at the bottom of the ECU inside the passenger's floor mat
foot protector cover and receives data related to the vehicle speed and
throttle position through the CAN communication and controls the
solenoid valves to obtain optimal steering force.
SSPS Solenoid Valve
Tie Rod End
Tie Rod
Bellows
SSPS Solenoid Valve
Valve Assembly
Feed Tube
Mounting Bracket
Cylinder Tube
Rack Housing
Adjusting Plug 1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
2. LAYOUT

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SSPS warning lamp
Comes on when SSPS system has a fault
Power steering supply hose and return hose for
SSPS model
Power steering pump with SSPS
Installed view Pump components

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4) System Control
ECPS system, according to the vehicle speed,
enables to achieve proper steering
characteristics by controlling hydraulic
pressure to reaction plunger located in input
shaft of power steering gear box. In other words,
ECPS control unit enhances the parking
conveniences by controlling duty type current
control. It provides heavy steerability with low
current as the vehicle speed increases. And, it
provides light steerability with high current as the
vehicle speed decreases.
▶During parking and low speed driving
During parking and driving in low speed, the control unit supplies approx. 1 A of electric current to
solenoid valve. Then, the spool located in PCV compresses the upper spring and elevates upward and,
the working pressure from oil pump (A port) is not able to flow to the reaction plunger (C port). As a
result, the pressing force from reaction plunger disappears and the steerability enhances.