Power tools - Gears Lubrication Grease - Page 1
Forum section: electronics / repair

author: 2X
author_rank: Frequent Contributor
timestamp: May 12, 2025, 05:11:05 am
content: Hello, I have the a Dewalt hammer drill. What type of grease is used for the gears of the power tools?

author: Ian.M
author_rank: Super Contributor
timestamp: May 12, 2025, 05:50:14 am
content: Probablyhttps://service.dewalt.ie/i/PARTS/GLOBALBOM/328771-02/Material_Safety_Data_Sheet/EN/328771_-_Thermoplex_ALN_250_EP__MSDS.pdf

author: 2X
author_rank: Frequent Contributor
timestamp: May 12, 2025, 07:34:23 pm
content: A guy told me that lithium grease is suitable for metalic gears. Does anyone use a lithium grease (if yes what brand?) on bearings?

author: Analog Kid
author_rank: Super Contributor
timestamp: May 12, 2025, 07:49:03 pm
content: Quote from: 2X on May 12, 2025, 07:34:23 pmI would say any decent-quality lithium grease should do fine. Nothing that special about the application: not aerospace or anything like that.I've been doing this for years with no problems. I have a can of ordinary lithium wheel-bearing grease I've been using the last couple decades.Just be sure to keep everything clean!

author: wraper
author_rank: Unknown
timestamp: May 12, 2025, 08:06:19 pm
content: Don't use a usual lithium bearing grease, it's way too thick for this. Better to leave the old grease than using that. Greases used for such purpose don't flow under their own weight but are soft, provide barely any resistance when you move a pointy object through the grease. MAKITA 042016-9A Grease SG #0 for example.

author: Gyro
author_rank: Super Contributor
timestamp: May 12, 2025, 09:23:27 pm
content: I normally use Molybdenum Disulphide based grease [Edit:, actually Moly reinforced Lithium,] for such applications - Castrol Moly. It has a lower viscosity than the standard Castrol LM Lithium wheel bearing grease and should have superior lubricating properties on ferrous wiping surfaces like gear teeth. From the image, I think the existing grease must have a significant MoS2component - it's difficult to believe that it can have become that black from wear alone.

author: richnormand
author_rank: Unknown
timestamp: May 13, 2025, 01:19:01 am
content: I usually use Lucas X-TRA heavy duty grease NLGI #2 with good success.Sticks well on fast moving parts, high temperature resistance and does not squeeze out under heavy load.I also found it better than the moly grease (and less messy to clean up).

author: wraper
author_rank: Unknown
timestamp: May 13, 2025, 02:02:38 am
content: NLGI #2 is too thick, it will cause excessive resistance to movement, thus tool will run hotter than normal. Also quite likely eventually it will just stick to the walls leaving mechanics dry, don't use too much grease either, it will cause excessive resistance to movement and overheating too. You want NLGI #0, or #1 if it's hard to get #0.

author: richnormand
author_rank: Unknown
timestamp: May 13, 2025, 02:35:55 am
content: Good point wraper. I'll get some #1 on the shelf too.Most of the stuff I did was bigger gears in the 100 to 500rpm range.

author: Addicted2AnalogTek
author_rank: Frequent Contributor
timestamp: May 13, 2025, 03:26:32 am
content: For that tool I'd probably be using Milwaukee Type J grease to rebuild. It's probably the same as the Dewalt stuff, it's just what I was able to get that wasn't ridiculously expensive. Check Dewalt Servicenet for documents, it should tell you on the blow up parts diagram for the gearbox, and also have packets, tubes, and tubs you can order.

author: bdunham7
author_rank: Super Contributor
timestamp: May 13, 2025, 03:33:48 am
content: The moly (black) versions of the grease used in automotive CV joints is about perfect for those applications. In that application it needs to flow much more easily than stringy wheel bearing grease.https://pmbperformance.com/products/moly-grease-for-c-v-joints-3-oz-packet