Answers.Body: <p>In Step 164 the axle the bevel gear is on becomes locked.
  At this step the sub assembly gets put on the main assembly and the axle is blocked by a large technic motor. Before this step, you could probably still manipulate the axle enough studs out with pliers to switch the bevel gear.</p>
  <p><a href="https://i.sstatic.net/YH6Wu.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/YH6Wu.png" alt="enter image description here" /></a></p>
  <p>That's of course still lot of steps to reverse, but you'll notice that the entire model is built in lots of smaller sub-assemblies... so you don't need to revert each step, you can leave the sub-assemblies intact...</p>
  <p>Alternatively, there are other ways to control the technic model than the standard app:</p>
  <ul>
  <li>brickcontroller2: you could create a profile very similar looking to the control+ interface but arrange the responding actions to accommodating for the inverted bevel gear.</li>
  <li>pybricks: You could create a program in python that controls the model based on input from a remote control or e.g. a PS4 controller...</li>
  <li>powered up app: similar to brickcontroller2 but the &quot;official&quot; way Lego suggests to go if the Control+ app doesn't suffice anymore...</li>
  </ul>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2023-04-03T10:05:47.280Z
Answers.LastActivityDate: 2023-04-03T10:05:47.280Z
Answers.UserDisplayName: Michael Verschaeve
Body: <p>I have a fully completed <a href="https://brickset.com/sets/42131-1/" rel="nofollow noreferrer">Cat D11</a>. Great build. (I have previously built the Bucket Wheel Excavator, the Rough Terrain Crane, Liebherr 9800, Airbus 175, etc.) Couldn't get through calibration. Did not understand I should have tested the build per step 198. (You'd think I could follow picture instructions at age 74...)</p>
  <p><a href="https://i.sstatic.net/8A6qO.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/8A6qO.png" alt="Picture of step 198 showing an instruction to test the functions using the app" /></a></p>
  <p>After much evaluation and checking everything I could think of, I can see in the build step 104 I put the small bevel gear ON THE WRONG SIDE of the drive gear. Obviously it is trying to drive that shaft in the wrong direction!</p>
  <p><a href="https://i.sstatic.net/vdx0f.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/vdx0f.png" alt="Pictures of steps 104 and 105, showing the misplaced bevel gear and its place in the larger sub-assembly" /></a></p>
  <p>Does anyone have an idea how I can switch out the gear WITHOUT tearing the build down completely? I'd like to see my 75th birthday...</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2023-04-01T21:03:59.383Z
Comments.Text: I'm afraid the only option is to go back to step you completed incorrectly to fix the issue. Bevel gears are tricky ones and unfortunately it got you unprepared.
Comments.UserDisplayName: Alex
Tags: <technic><repair><disassembly>
Title: How do I switch out a gear in the Cat D11 set without taking the set apart?
UserDisplayName: Jack
ThreadText: # How do I switch out a gear in the Cat D11 set without taking the set apart?
  
  (Asked by: username_0 on 2023-03-31)
  
  I have a fully completed [Cat D11](https://brickset.com/sets/42131-1/). Great build. (I have previously built the Bucket Wheel Excavator, the Rough Terrain Crane, Liebherr 9800, Airbus 175, etc.) Couldn't get through calibration. Did not understand I should have tested the build per step 198. (You'd think I could follow picture instructions at age 74...)
  
  [![Picture of step 198 showing an instruction to test the functions using the app](https://i.sstatic.net/8A6qO.png)](https://i.sstatic.net/8A6qO.png)
  
  After much evaluation and checking everything I could think of, I can see in the build step 104 I put the small bevel gear ON THE WRONG SIDE of the drive gear. Obviously it is trying to drive that shaft in the wrong direction!
  
  [![Pictures of steps 104 and 105, showing the misplaced bevel gear and its place in the larger sub-assembly](https://i.sstatic.net/vdx0f.png)](https://i.sstatic.net/vdx0f.png)
  
  Does anyone have an idea how I can switch out the gear WITHOUT tearing the build down completely? I'd like to see my 75th birthday...
  
  **Tags:** technic, repair, disassembly
  
  > **Comments:**
  > **username_1**: I'm afraid the only option is to go back to step you completed incorrectly to fix the issue. Bevel gears are tricky ones and unfortunately it got you unprepared.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2023-04-03. Score: 1
  
  In Step 164 the axle the bevel gear is on becomes locked.
  At this step the sub assembly gets put on the main assembly and the axle is blocked by a large technic motor. Before this step, you could probably still manipulate the axle enough studs out with pliers to switch the bevel gear.
  
  [![enter image description here](https://i.sstatic.net/YH6Wu.png)](https://i.sstatic.net/YH6Wu.png)
  
  That's of course still lot of steps to reverse, but you'll notice that the entire model is built in lots of smaller sub-assemblies... so you don't need to revert each step, you can leave the sub-assemblies intact...
  
  Alternatively, there are other ways to control the technic model than the standard app:
  
  * brickcontroller2: you could create a profile very similar looking to the control+ interface but arrange the responding actions to accommodating for the inverted bevel gear.
  * pybricks: You could create a program in python that controls the model based on input from a remote control or e.g. a PS4 controller...
  * powered up app: similar to brickcontroller2 but the "official" way Lego suggests to go if the Control+ app doesn't suffice anymore...
  
  
  ---
  
  