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Old 12-15-2020, 06:45 AM   #1
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Brand: DRV
Model: 38 RSB3
State: South Dakota
Posts: 2,065
THOR #1658
Arrow Replacing a slide gearbox

Replacing a slide gearbox

The replacement gearbox I received was an updated version and has a tall raised collar at the output shaft. (See the difference on picture # 1) If this happens to you, you will need to do the additional steps at the bottom.

1. Cover the top of the slide with cardboard to keep grease off it.
2. Take some nail polish and mark both chains so when you reinstall the chain back on the sprockets of the gearbox you can line them up properly. (See picture # 2)
3. On the adjuster block, loosen the jam nut, then loosen the adjuster nut to create slack in the chain. Do this to all four adjuster blocks. (See picture # 3) I took the front adjuster blocks on each side completely apart to make it easier to maneuver the chain from the sprockets. (See picture # 4)
4. Remove the chain on both sprockets of the gear box.
5. Remove the two nuts at the bottom of the gearbox. (See picture # 5.) Remove the carriage bolts.
6. Slide the gearbox off of the “drive shaft” that connects the motor to the gearbox. If you do not need to replace the bracket, reverse these steps to reinstall the new gear box.

If you have the updated version of the gear box:
1. Remove the two bolts that secure the motor to the bracket.
2. Remove the five screws mounting the bracket to the wall. (I took a sharpie and drew a line on the side and some of the top to make sure the new bracket was installed in the same place)
3. Reverse all of the stops to install the updated version of the gear box.

***When tightening the adjuster blocks, make sure that they are straight. They need to pass each other without touching.

***My gearbox was for the bed slide. My slide was halfway out. There was limited work space and a lot of the work was done by feel. The project took me three hours to complete.
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Old 12-15-2020, 12:42 PM   #2
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Brand: Thor Motor Coach
Model: Venetion
State: Nevada
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THOR #19899
Nice job, Thanks for the post!
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Old 12-15-2020, 04:27 PM   #3
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Brand: DRV
Model: 39TKSB3 "Modified"
State: South Dakota
Posts: 1,576
THOR #1661
NICE!

Now I know who to call when mine needs replacing!
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Old 12-15-2020, 05:06 PM   #4
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Brand: DRV
Model: 2019 MS 39DBRS3
State: Delaware
Posts: 461
THOR #9431
Will be interesting to find out if it was a gear failure and if the gears are plastic.

Ford Super Duty mirrors use plastic gears and they fail on occasion.
Don't know if they are still available but there was an individual on the FTE forum that was making replacement gears out of brass. IIRC he was charging around $65

If that was your failure it might be worthwhile to see if an upgraded gear could be made at a cost that makes replacing the gearbox more expensive.
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Old 12-16-2020, 03:39 PM   #5
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Brand: DRV
Model: 41 RSSB 4
State: South Dakota
Posts: 6
THOR #3565
slide gearbox

I ,also, have had a gearbox failure in the past and replaced same. after i tore down bad gearbox to see what failed. gears where all ok, the problem is the gear SHAFT does not have an adequately BOSSED area in the case so it brakes out internally and than the gears do not mess and break. MAYBE the new gearbox has that BOSS on there for that reason ? just my thoughts
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Old 12-16-2020, 04:35 PM   #6
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Model: 39TKSB3 "Modified"
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THOR #1661
You would hope the change is a reliability improvement.
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Old 12-16-2020, 09:03 PM   #7
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Brand: DRV
Model: 38 RSB3
State: South Dakota
Posts: 2,065
THOR #1658
Quote:
Originally Posted by Cummins12V98 View Post
You would hope the change is a reliability improvement.
You would hope so.
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Old 12-17-2020, 02:33 PM   #8
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Model: 41 RSSB 4
State: South Dakota
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THOR #3565
I have found that MANUFACTURES tend to make things BREAK !!! that way they SELL more . Built a lot of DESTRUCTIVE testing facilities, if it works too well , NOT GOOD , by their standards !!!!!!!!
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