37 20 001 Removing and Installing/Replacing Dynamic Drive Valve Block

37 20 001 Removing and installing/replacing DYNAMIC DRIVE valve block

Special tools required:





Warning!
Danger of poisoning if oil is ingested/absorbed through the skin!
Risk of injury if oil comes into contact with eyes and skin!

Important!
Adhere to the utmost cleanliness. Do not allow any dirt to enter the hydraulic system.





Note:
In all warranty cases you must always provide a fault memory printout, even where there is no fault memory entry, with the defective part. In addition, the valve block openings must be sealed with the protective caps (of the new part).





Necessary preliminary tasks:
^ Draw off and dispose of hydraulic fluid from fluid reservoir
^ Partially remove front right wheel arch cover (rear section)
^ Remove right underbody panelling





Removing valve block:
Disconnect plug connections (1) and expose wiring harness up to valve block.

Release screw pins (1), open holder and suspend hydraulic lines to one side.








Open holder (1) and remove control lines to rear axle oscillating motor.





Important!
Hydraulic line and connection on valve block must be fitted with suitable sealing plugs immediately after removal!

Release hollow nuts of control lines (1, 2) to front axle oscillating motor with special tool 37 1 151.





Release hollow nuts of control lines (3, 4) to rear axle oscillating motor with special tool 37 1 151.

Release hollow nut of pressure line (5) with special tool 13 5 020.

Release hollow nut of return line (6) with special tool 37 1 152.





Unclip wiring harness (1).

Release nuts (2) and remove valve block.





Installing valve block:
Replace self-locking nuts.

Mount valve block with new nuts (2) on body.

Tightening torque 37 14 10AZ.

Secure wiring harness (1) to floor plate.

Important!
When assembling, make sure that only the sealing plugs of the line to be fitted are removed.





Do not damage sealing surfaces of hydraulic lines.

Note:
Make sure hydraulic lines are laid without tension and with sufficient spacing to adjoining components.





Installation sequence for hydraulic lines:
1. Install control lines (3, 4)
Tightening torque 37 14 14AZ.
2. Install pressure line (5)
Tightening torque 37 14 11AZ.
3. Install return line (6)
Tightening torque 37 14 12AZ.
4. Install control lines (1, 2)
Tightening torque 37 14 13AZ.





Check seating and position of line clip (1), correct if necessary.

Replace screw pins (1).





Insert hydraulic lines in holder and seal holder with screw pins (1).

Tightening torque 37 14 22AZ.





Insert control lines in holder (1) and seal holder.

Note:
Replace damaged holder.





Connect plug connections (1) and lay wiring harness up to valve block.

After installation:
^ Fill and bleed hydraulic system





^ Check pipe connections for leaks
^ Carry out initial Dynamic Drive operation

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