Easy
15-30 minutes
Keep in mind that this high-quality part is sold individually but includes four hex screws and four rings. The gearbox assembly attaches to the pinion. It may require an allen wrench and socket set during installation. It is made of metal and will need to be replaced if it becomes broken. This part is an OEM sourced directly from the manufacturer for use in Ridgid planers.
Gearbox Assembly 089170109706
OEM part for: Ridgid
Part Number: 089170109706
$130.56
In Stock
Ships within 1 business day 
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Compatibility
This part will fit the following 1 machine
Ridgid
R4331 13 In. Thickness Planer View Diagrams & Manuals
This item works with the following types of products:
- Planer Parts
This part replaces obsolete part #: 089170109701
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The part arrived as expected and their service was great
Guest -
April 10, 2022
Verified Purchase
Great parts, easy fix
My parts for my Rigid planer came the next day and I was up and running in 10 minutes. Saved me over $300 to fix my planer rather than buying a new one. I have purchased parts here before and will in the future.
Guest -
June 4, 2020
Verified Purchase
Super easy replacement
This replacement part was way better than the original equipment simply bolted in and works perfectly
Guest -
April 18, 2019
Verified Purchase
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Does this fit my product?Questions & Answers for Gearbox Assembly
The rollers will not turn. I have only planed about 8 to 10 boards. It was doing fine and just stopped feeding the boards.
Mike
for model number R4331
asked on 2023-11-01
Hello Mike, Thank you for your inquiry. We would recommend checking the gearbox assembly, the sprocket and the chain. We have included a link to our article on the planer binding up: https://www.ereplacementparts.com/repair-center/power-tool/planer/won't-adjust-up-and-down-or-binds/ We hope this helps.
eReplacementParts Team November 01, 2023
Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Feed rollers didn't turn - blade did
David - March 19, 2016
👍 8 of 8 people found this instruction helpful
Tool Type
Planer
Difficulty
Easy
Time
30-60 minutes
Tools Used
Screwdriver, Pliers, torx/allen wrench
Took top and sides off a Rigid R4331 planer when it wouldn't pull a board into the blades. saw drive sprocket on outfeed roller was split in half (not sure how that could have happened). Drive gear in gearbox was ruined and gearbox actually was bent and gear teeth were all around. One chain seemed to have some problems from bent links as well. Outfeed roller was replaced because I filed out the key way a bit to pull the sprockets off and decided the key way then had too much play for sprockets. Most work was done with the on-board torx driver that came with the planer. Aside from spending too much time trying to make sure the outfeed roller was installed right, the whole repair took about 30 minutes. I made sure everything turned by hand after putting new roller, gearbox, sprockets and chains back on. Tightened everything up, plugged it in and stood slightly back in case it blew up. Works like a charm now. I bought the planer as a returned item from an online surplus dealer for 150. spent about 100 on parts..and it seems I now have a pretty much "new" planer.
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The planer would no longer move boards through it. The gear box broke and I thought the pinion gear was bad, it wasn't just looked odd.
Daniel - November 17, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Planer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrench and socket set were used.
Took the top of the planer off 4 bolts on top. The hard part was the repeat a cut dial. There is a ball bearing that pops out and a spring under it. Remove the grease tray from under the gear box. Remove the old box. Put the new gear box on. The screws look like they had loctite on them, so I added some to mine. Put everything back together. The only tricky part is putting the repeat a cut back on. Use a small screw driver to hold down the spring and ball into the hole then slide the shaft of the repeat a cut over the screwdriver and into the slot.
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Bushing had slack in feed roller
Frank - March 12, 2023
Tool Type
Planer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Snap ring pliers. allen wrench
Parts Used
Got piece of alumimun. Drilled and made new bushing. Machinie shop made bushings for transmission and i replaced. Saved new tranmission for future problems
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Out feed roller wasn’t working
Mark - January 21, 2023
Tool Type
Planer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Torx drivers
Replaced gearbox and both belts due to showing signs of cracking.
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Inconsistent feed rate of boards through planer (chugging)
James - January 31, 2019
Tool Type
Planer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrench, retaining ring pliers
Parts Used
Upon inspection of the gearbox, I noticed the brass bushings were worn unevenly from years of use. Those bushings are not available for purchase so I had to buy the whole gearbox assembly. I was glad I did! The gearbox I received was enclosed, where the first gearbox was sandwiched between two plates. The old gearbox allowed contaminants to enter the mechanism where the new gearbox would not. Powered it back up and the planer ran like new. Note: do not bother memorizing the disassembly of the original gearbox, the new gearbox only requires 3 screws with no subassembly. While the machine is open, take the opportunity to clean the chains and sprockets.
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Feed rollers quit working. Noise in gearbox
Daniel - September 27, 2018
Tool Type
Planer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Allen wrenches,snap ring pliers.
Parts Used
1. Remove, adjustment handle, repeat cut knob, and cover of planer
2. Adjust to maximum height.
3. Remove retaining rings for drive sprockets.
4. Remove old gear box screws and gear box.
5. Replace and secure new gear box.
6. Replace drive sprockets and install retaining clips
7. Replace planer cover, adjustment handle, and repeat cut knob.
2. Adjust to maximum height.
3. Remove retaining rings for drive sprockets.
4. Remove old gear box screws and gear box.
5. Replace and secure new gear box.
6. Replace drive sprockets and install retaining clips
7. Replace planer cover, adjustment handle, and repeat cut knob.
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Gear box ate itself up.
Martin - May 21, 2017
Tool Type
Planer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Pliers
Parts Used
Removed the bad gear box and installed the new one.
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The gears were stripped
Henry - May 15, 2017
Tool Type
Planer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Wrench Set, Snap ring pliers
Parts Used
Removed the side panel.
Removed the retaining ring sprocket and washer.
Remove the gearbox from the planer.
Reassembled in reverse order
Removed the retaining ring sprocket and washer.
Remove the gearbox from the planer.
Reassembled in reverse order
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Gear box assembly
Ronald - April 5, 2017
Tool Type
Planer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Alan wrenches
Parts Used
Removed the cover and saw the gear box assembly washers were wore out ordered a new piece and now it runs better and quieter than it did when it was new.
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Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
