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Rear Hatch Lock and Latch Replacement
 
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Pelican Technical Article:

Rear Hatch Lock and Latch Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$125

Talent:

***

Tools:

13mm, 10mm socket, Philips head screwdriver

Applicable Models:

Mercedes-Benz 300TD (1979-85)

Parts Required:

Lock / latch assembly

Hot Tip:

Take your time, it's a tight fit

Performance Gain:

Working hatch lock

Complementary Modification:

Lubricate the lock system

The lock and latch in the rear hatch on the W123 wagons is in an area that can see a lot of moisture and corrosion due to the fact that the windshield wiper arm seal above it usually leaks. The lock itself usually does not fail unless you live in a climate that sees a lot of moisture. If you have to remove the lock to service it or replace it give yourself plenty of time, as it is a really tight fit in between the door panels and can be a pain to remove.

Over the years your car may have been serviced by multiple people including previous owners and this can lead to parts replaced with different size fasteners and hardware. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches. If something is different on your vehicle please let us know and share your info to help other users. If you have any questions or comments or even a different procedure you would like to share please leave it below and please leave your vehicle information.

The lock is inside the rear hatch and requires the removal of the rear hatch panel to access it.
Figure 1

The lock is inside the rear hatch and requires the removal of the rear hatch panel to access it. Please see our article rear hatch panel removal for additional assistance.

With the panel removed disconnect the wiring connection on the right side of the lock (red arrow).
Figure 2

With the panel removed disconnect the wiring connection on the right side of the lock (red arrow). Our car had a rear windshield wiper that has a support bracket for the motor (yellow arrow); this needed to be removed to get the lock out.

If your vehicle is equipped with this bracket you will need to remove the wiper to remove the bracket.
Figure 3

If your vehicle is equipped with this bracket you will need to remove the wiper to remove the bracket. Please see our article on rear wiper motor replacement for step by step instructions. You do not need to disconnect the wiring.

With the motor out use a 13mm and 10mm socket and remove the bracket (red arrow).
Figure 4

With the motor out use a 13mm and 10mm socket and remove the bracket (red arrow).

Working on the left side of the lock disconnect the locking rod from the assembly (red arrow) by pushing the end of the rod up and out of the assembly.
Figure 5

Working on the left side of the lock disconnect the locking rod from the assembly (red arrow) by pushing the end of the rod up and out of the assembly.

Use a 13mm socket and remove the bolt on the top of the door holding the armature in place (red arrow).
Figure 6

Use a 13mm socket and remove the bolt on the top of the door holding the armature in place (red arrow).

Remove the rod from the door.
Figure 7

Remove the rod from the door.

If your vehicle is equipped with a vacuum lock actuator (red arrow) disconnect the lines and remove the two Philips head screws.
Figure 8

If your vehicle is equipped with a vacuum lock actuator (red arrow) disconnect the lines and remove the two Philips head screws.

Disconnect the arm on the actuator from the lock and remove the actuator from the opening in the door.
Figure 9

Disconnect the arm on the actuator from the lock and remove the actuator from the opening in the door.

Use a Philips head screwdriver and remove the single screw and handle from the inner door handle (red arrow).
Figure 10

Use a Philips head screwdriver and remove the single screw and handle from the inner door handle (red arrow).

Remove the three 13mm bolts holding the lock to the back of the hatch (red arrows) along with the two on the lower edge.
Figure 11

Remove the three 13mm bolts holding the lock to the back of the hatch (red arrows) along with the two on the lower edge.

The lock assembly is now free and can be removed from the door out through the right side opening.
Figure 12

The lock assembly is now free and can be removed from the door out through the right side opening. You need to compress down the mechanism to get it off of the outer lock and then slide it out towards the right. It is a tight fit and will only come out one way so take your time, it will come out. Installation is the reverse of removal.

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Page last updated: Wed 12/7/2016 03:05:35 AM