Tension/Release Front Axle Spring - AR32.20-P-0200-05MFA

Model 118, 177, 243, 247 

Number	Designation		Model 118, 247.6/7	Model 177, 247 (except 247.6/7)
BA32.25-P-1001-04J	Self-locking nut, spring cup to piston rod	Nm	105	105

Number	Designation		Model 243
BA32.25-P-1001-04J	Self-locking nut, spring cup to piston rod	Nm	100

Courtesy of MERCEDES-BENZ USA

Positioning dimensions: 

Model 118, 177, 247 with code 485 (Comfort suspension) 

Model 118, 177, 247 with code 677 (AGILITY CONTROL suspension) 

The following special tools are required: clamping plate, adapter plate, cover, clamping plate, adapter plate, socket set, tensioning device.

Clamping plate contains: Clamping wedges (01), upper clamping plate (04), clamp screws (2), screws (3).

The clamping wedges (01, 02) must be attached to avoid unintended twisting of the front axle spring (1).

1. Attach clamping wedge (01) and spacer ring (03) to upper clamping plate (04) using screws (3).

   

   Clamping wedge (01) must be positioned in bore 09 and 17 relative to upper clamping plate (04).

   Courtesy of MERCEDES-BENZ USA

2. Attach protective mat (08) to lower clamping plate (05).
3. Attach protective mat (08) with lower clamping plate (05) to tensioning device (06) and move into assembly position.
4. Insert suspension strut (40) into upper clamping plate (04) and lower clamping plate (05).

   

   Insert the suspension strut (40) by turning between the upper clamping plate (04) and the lower clamping plate (05).

5. Align head bearing (7) to spacer ring (03) and adjust tensioning device (06) to positioning dimension "L4" (insert position).

   

   The head bearing (7) only fits in one position into the spacer ring (03).

   Courtesy of MERCEDES-BENZ USA

6. Secure clamping wedge (02) with clamp screws (2) to clamping wedge (01).

   

   Tighten clamp bolts (2) by hand until the clamping device (02) lies against the front axle spring (1).

7. Twist front axle spring (1) so that the start of the spring coil reaches positioning dimension "H" (arrow).
8. Tension front axle spring (1) until positioning dimension "L5" is reached.
9. Tighten clamp bolts (2).

   Always observe reference value of 5 Nm.

   Otherwise, the thrust bearing (5) may be damaged or the front axle spring (1) may become twisted during clamping.

   Courtesy of MERCEDES-BENZ USA

10. Tension front axle spring (1) using tensioning device (06) until positioning dimension "L3" is reached.
11. Counterhold piston rod and unscrew nut from piston rod .

    

    Counterhold piston rod with spline EV210.

    Replace nut.

12. Extend shock absorber (6).
13. Bring tensioning device (06) into positioning dimension "L1".
14. Remove clamping wedge (02).
15. Remove front axle spring (1) and head bearing (7).

    If the head bearing (7) is damaged,

    ↓

    replace head bearing (7).

    Courtesy of MERCEDES-BENZ USA