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Description and operating principle of the front suspension (Freelander 2)

 
  • Main
  • Freelander
  • Freelander 2
  • Chassis
  • Front suspension
  • Description and operating principle of the front suspension
 
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Contents: Arrangement of elements ⇩ Review ⇩ Spring and shock absorber ⇩ Lower control arm ⇩ Wheel knuckle and hub assembly ⇩ Anti-roll bar ⇩

Arrangement of elements


Arrangement of elements


Pos.Spare part numberName
1-Right (RH) spring and shock absorber assembly
2-Stabilizer bar stand
3-Anti-roll bar
4-Left (LH) spring and shock absorber assembly
5-Wheel cam
6-Hub and bearing assembly
7-Lower control arm
8-Stretcher

Review


The front suspension uses long-travel MacPherson struts to optimize dynamic performance on and off-road.

The suspension components are mounted on a subframe. The subframe is mounted on four bushings with variable compression ratios to absorb lateral and longitudinal loads. This provides a rigid platform to compensate for the loads acting on the front suspension during cornering, to absorb frontal impact loads, and to secure towing equipment during off-road recovery.

Spring and shock absorber


Spring and shock absorber


Pos.Spare part numberName
1-Rubber cuff
2-Upper support bolts (3 pcs.)
3-Upper support top plate
4-Bottom plate of the upper support
5-Buffer washer
6-Upper support bearing
7-Spring insulator
8-Spring
9-Spring insulator
10-Shock absorber housing
11-Spring seat
12-Shock absorber piston rod
13-Lock-nut
14-Auxiliary device of elastic element



The spring and shock absorber assembly is a twin-tube design, with a traditional coil spring located on a welded spring seat on the shock absorber tube. The lower end of the shock absorber body is located in the wheel knuckle, which is secured with a bolt.

The damping capacity of the shock absorber is determined by limiting the flow of the working fluid through the internal channels of the shock absorber. The shock absorber rod moves along the axis of the working cylinder, and due to the resistance to the flow of liquid, forces are created that prevent the relative movement of the rod and the working cylinder. These forces cause the damping of vibrations that occur when the car moves over uneven roads. A seal is installed between the rod and the working cylinder of the shock absorber, which, on the one hand, does not allow the working fluid to leak out, and on the other hand, prevents dirt and moisture from entering the shock absorber. In addition, the seal plays the role of a rod cleaner.

The shock absorber rod passes through the central hole of the upper support assembly. The outer end of the rod is threaded. A self-locking nut secures the shock absorber rod to the upper support. An auxiliary device of the elastic element is installed on the shock absorber rod. It prevents contact of the upper support with the upper part of the shock absorber when the suspension is fully compressed, and also helps to adjust the suspension. A rubber cuff is installed between the shock absorber body and the upper support; it protects the shock absorber piston rod from damage.



The spring installed depends on the vehicle specification. Each spring is color coded to indicate its rating and installation conditions.

The spring is located in a spring seat, which is an integral part of the shock absorber body and includes a spring insulator. The spring seat is designed to prevent the spring from rotating. The spring has a linear compression ratio and is inclined to counteract cornering forces. The opposite end of the spring is also located in a spring insulator, which is installed in the upper support assembly. Both spring insulators are made of rubber and prevent the transmission of noise to the vehicle body that occurs when the shock absorber and spring are stretched/compressed.

The upper support is equipped with a bearing, which is located between 2 upper support plates and the shock absorber rod. A self-locking nut secures the shock absorber rod to the upper support. The upper support bearing reduces the resistance of the steering gear, preventing the spring from twisting when turning the steering wheel. The upper support is attached to the reinforced dome of the strut on the chassis with 3 built-in studs and self-locking nuts.

Two brackets are welded to the shock absorber body. One bracket provides mounting for the stabilizer bar. The second bracket provides mounting for the brake hose and wheel speed sensor wire. This bracket also firmly mounts the shock absorber to the wheel knuckle and its position is critical to controlling the ride height of the vehicle.



Lower control arm


Lower control arm


Pos.Spare part numberName
1-Stretcher
2-Ball bushing
3-Front mount bolt
4-Rear mount bolt (2 pcs.)
5-Rear mount nut (2 pcs.)
6-Hydraulic bushing
7-Lock-nut
8-Conical ball joint


The lower control arm assembly consists of a control arm, rubber bushing, hydraulic bushing and ball joint.

The control lever is made of stamped steel. At the outer end there is a maintenance-free conical ball joint, mating with the wheel knuckle.

The 2 inner mounts are located in the subframe. The front mount is a maintenance-free rubber bushing pressed into the control arm. This joint is located in a socket in the subframe and is secured with a bolt screwed into a threaded protrusion on the subframe.

The rear mount is a hydraulic bushing located on the centering lug on the control arm. The hydraulic bushing has 2 welded brackets that secure the bushing to the subframe using 2 bolts and nuts. The hydraulic bushing contains hydraulic fluid and valves that allow the bushing offset to be controlled to improve damping and handling characteristics, as well as to reduce the transmission of road noise. The bushing gradually becomes more rigid as the forces acting on it increase (for example, under hard braking).



Wheel knuckle and hub assembly


Wheel knuckle and hub assembly


Pos.Spare part numberName
1-Clamp bolt
2-Wheel cam
3-Anti-lock Brake System (ABS) Wheel Speed Sensor Mount
4-Steering rod mount
5-ABS Wheel Speed Sensor Pulse Ring
6-Sealing
7-Wheel bearing
8-Hub
9-Wheel stud
10-Disc shield mounting
11-Brake caliper mount

The cast steel wheel knuckle provides mounting for the lower control arm, spring and shock absorber assembly, wheel hub and bearing assembly, and tie rod end.

The extended lower projection on the knuckle provides the attachment of the ball joint of the steering rod. The ball joint is a conical fitting and is secured with a lock nut. The steering rod allows adjustment of the toe-in angle of the wheels.

The upper part of the wheel knuckle has a mounting hole for the shock absorber housing. The shock absorber housing enters the hole and is located opposite the stop. The rear surface of the hole has a slot and allows you to fix the shock absorber housing in the wheel knuckle using a clamping bolt.

There are places for installing the brake caliper and brake disc shield. The upper surface of the wheel knuckle has a hole for installing the ABS wheel speed sensor, which is secured with a bolt.



Anti-roll bar


Anti-roll bar


Pos.Spare part numberName
1-Locknut (hidden)
2-Ball joint
3-Rack
4-Ball joint
5-Lock-nut
6-Clamp
7-Sleeve
8-Anti-roll bar
9-Bolt (2 pcs.)

The anti-roll bar is secured to the subframe with bushings and mounting brackets. The stamped steel brackets are located above the bushings and are secured to the crossmember with bolts that are screwed into threaded holes in the subframe. The stabilizer bar has "thrust" rings pressed into the inner side of the bushings. The rings prevent lateral displacement of the stabilizer bar.

The stabilizer is made from a 20.5 mm diameter manganese steel rod. The ends of the stabilizer are bent forward to attach to the ball joint on the stabilizer strut. Each stabilizer strut is secured with a lock nut to a bracket on the shock absorber body. The struts do not differ in the installation side and allow the stabilizer bar to move with the wheel travel, providing maximum efficiency.

The stabilizer bushings are compression type bushings that grip the stabilizer when compressed by the mounting brackets. When replacing the bushings, it is necessary to ensure that the bushings are correctly oriented in relation to the stabilizer. Incorrect bushing adjustment can result in excessive preload (twisting) in the bushings when the suspension is set to the nominal height position.


This article is available at russian, bulgarian, belarusian, ukrainian, serbian, croatian, romanian, polish, slovak, hungarian
Article review: Roman Mitrofanov


 

Previous article
Front Suspension Specifications

Current article
Description and operating principle of the front suspension

Next articles
Front wheel bearing
Lower arm
Front stabilizer bar
Front stabilizer bushing
Front stabilizer bar
Front wheel knuckle
Front shock absorber
Shock absorber assembly with spring

 
 

Similar articles from Land Rover repair manuals:
• Air suspension operating modes Discovery 3 (2004-2009)
• Front suspension — device Discovery 1 (1989-1998)
• Front and rear suspension Range Rover 3 (2001-2012)
• Description and operating principle of the front suspension Defender 2007+ (2007-2016)

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