====== Replacing 190E Steering Gearbox ======

This article is a reference for replacing the steering gearbox on a 190E and may be applicable to similar models. Remanufactured steering gearboxes may be purchased from [[http://www.candmhydraulics.com|C & M Hydraulics]] based in Las Vegas, Nevada. 

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^ Time | 2 hours |
^ Cost | {{icon>dollar?color=#008000}} {{icon>dollar?color=#008000}} {{icon>dollar?color=#008000}} {{icon>dollar?color=#000000}} {{icon>dollar?color=#000000}} |
^ Difficulty | {{icon>cog?color=#0000ff}} {{icon>cog?color=#0000ff}} {{icon>cog?color=#000000}} {{icon>cog?color=#000000}} {{icon>cog?color=#000000}} |
^ Parts Required | Power steering fluid - 1 46 0001 \\ Power steering filter - 000 466 2104 \\ Steering coupler - 123 460 0210 \\ Renew locking hex nuts for tie rod ends - N913002010010 |
^ Applicable models |  All 190Es with left hand drive  |
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===== Special Tools =====

[[https://www.amazon.com/OTC-6297-Ball-Joint-Separator/dp/B0015PN010 | Balljoint separator]] - Used for removing the left tie rod and center drag link

[[https://www.amazon.com/TEKTON-5685-4-Inch-3-Jaw-Puller/dp/B000NPUKAM | Gear puller]] - Removing pitman arm from steering gearbox output shaft

[[https://www.amazon.com/Lumax-LX-1185-Black-Suction-Vinyl/dp/B000MD4YNY | Suction gun]] - Used to remove old power steering fluid

[[https://www.amazon.com/Lisle-49200-Heavy-Duty-Plier/dp/B0009OR8ZM | Snap ring plier]] - Remove snap ring from pitman arm shaft 

===== Power Steering Fluid =====

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<caption>**Part number**: 1 46 0001 \\ **Fill capacity**: 0.6 L \\ **Cost (as of 12/2015)**: $8.70 / unit </caption>
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===== Procedure =====

==== Preparation ====
  - Lift front end of vehicle in the air
==== Siphon / Drain Old Fluid ====


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  - Remove power steering fluid reservoir cap
  - Remove filter
    - Filter is held in place by a 10mm nut under spring tension. Caution when removing this 10mm nut as it may spring out once unthreaded
  - Pull old filter out with pliers
  - Use a suction gun to remove old fluid.
    - Rotate steering wheel left and right to pump more fluid back into the reservoir. Remove as much as possible.
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<caption>Suction gun on power steering fluid reservoir</caption>
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<caption>Removing old power steering filter</caption>
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==== Steering gearbox removal ====

  - Center steering wheel and lock in place
  - Remove power steering hoses
    - Remove the hose closer to the engine via the 17mm nut
    - Remove the hose farther away via hose clamp farther down the line
    - You will be removing the steering gearbox with one hose left attached
  - Looking up the steering shaft input, there should be a 6mm bolt visible for the steering coupler.
    - A stubby 1/4" 6mm hex bit may be required to remove this
  - Remove drag link and driver side tie rod from pitman arm
    - 17mm nuts must be renewed
  - Remove driver side wheel to access 3x 15mm frame bolts inside the wheel well
  - Pull steering gearbox out with pitman arm attached
  - Remove pitman arm on the bench
    - Use snap ring plier to remove snap ring
    - Use gear puller if necessary
    - Take note on where the pitman arm is mounted on the output shaft. This affects front toe settings.

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<caption>17mm nut on steering gearbox</caption>
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<caption>Power steering hose clamp </caption>
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<caption>6mm steering coupler bolt</caption>
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<caption>Pitman arm detached from tie rod and drag link</caption>
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<caption>Steering gearbox frame bolts in wheel well</caption>
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<caption>Steering gearbox removed from vehicle</caption>
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<caption>Removing pitman arm snap ring with pliers </caption>
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==== Installation ====

  - Install upper power steering hose with 19mm nut onto the replacement steering gearbox
  - Install pitman arm (this can be deferred to after the gearbox has been mounted in the car for easier gearbox installation)
    - Use centering mark to align and install
    - Tighten down at the same depth as previously measured
    - Install snap ring
  - Install steering coupler to steering shaft
    - Note the flat end on the steering shaft when installing the new coupler. This is where the bolt runs through
  - Install steering gearbox to coupler, do not turn steering wheel to install bolt yet
  - Install the 3 frame bolts in wheel well
  - Tighten power steering hoses
    - 17mm hose nut
    - Hose clamp
  - Install tie rod and drag link
    - Use new self locking hex nuts
  - Turn steering wheel and install other 6mm coupler bolt
  - Install power steering filter in reservoir
  - Fill power steering reservoir to capacity
    - Steering may need to be fully rotated a few times for correct fill

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<caption>19mm hose on steering gearbox</caption>
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<caption>Pitman arm centering mark</caption>
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<caption>Steering shaft</caption>
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<caption>Steering coupler installed</caption>
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<caption>Steering gearbox installed onto coupler</caption>
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<caption>Power steering filter</caption>
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