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Old 11-15-2018, 06:25 PM   #1
Qman97
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Default Rear gear oil

What do you all use? I looked In the manual and it only says replace with 22 oz. not the weight off the oil. ???Synthetic oil........yay or nay?
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Old 11-15-2018, 06:44 PM   #2
NCPW
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Default Re: Rear gear oil

You'll probably get 4 or 5 different answers on this topic, been discussed ad nauseam over the years, but I think the manual calls for SAE 30. Not 100% on that and I'm sure someone will correct me if wrong.

I personally used 80-90w synthetic gear oil and have had zero issues. Transaxle has never even gotten warm.
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Old 11-15-2018, 06:50 PM   #3
LukeL
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Default Re: Rear gear oil

75w 90 gear oil works great.


Club Car DS driver’s club #59
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Old 11-15-2018, 09:24 PM   #4
Qman97
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Default Re: Rear gear oil

Thanks appreciate the info!

Just did the gear oil in my Subaru and think I have that much and weight left over
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Old 11-15-2018, 10:56 PM   #5
NoleFan4Ever
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Default Re: Rear gear oil

Ha! One of my biggest peeves over the years - Lol!

Rear End Lube Change:
-22oz's of 85w/90 synthetic rear end grease. Mobil 1 or any good quality type will work fine.
-Jack it up, pull the fill plug which is up the side of the housing. Then pull the drain plug and drain. (check oil for any foreign material)
-Reinstall the drain plug, stick your manual $8 lube pump tube (from Advance Auto Parts) in the fill hole (do not attempt to use the vent hole), lower the cart back level and pump it until it reaches the threads of the fill hole. (22 ounces + or - will get you there)

If you cannot get 85w/90, 80w/90 will work, but the viscosity is different. Engine oils, compared to gear oils, usually have lower viscosity when cold. They contain more detergent additives and require higher temperatures to burn. They are designed to protect engines from damage caused by solids and acids formed in combustion. Gear oils usually have more additives to prevent wear at extreme pressures and are often available in formulations for various compatibilities. Basically, it comes down to the base oil and additive pack. 30w engine oil will work, but it is "engine" oil and when CC designed their Graziano specs, it was a cart that was only going to run ~14 mph and around a golf course (and honestly, at those speeds and loading, you could run Wesson Oil or Castor Oil and be fine). I would venture to say there is a very small percentage of us on this site that still have carts running on golf course at ~14 mph. We have them lifted, or loaded, or pulling, or speeding, or hauling, or deer chasing, or.....
And with BIGGER motors, controllers, tires, gears, accessories, # of passengers, etc. etc. will relate to excessive loading on the gears/bearings and for all these reasons, put "Gear Lube" in gear cases and engine oil in Engines....

Just my highly experienced AGMA Certified Gear opinion....

PS- I am attaching viscosity chart for your review.
Attached Images
File Type: jpg Oil Viscosity Chart.jpg (290.3 KB, 0 views)
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Old 11-15-2018, 11:31 PM   #6
Fairtax4me
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Default Re: Rear gear oil

For electric transaxle, Pretty sure manual says 30wt SAE, but I’ve always run 80w-90 gear oil. Any kind will work, Synthetic or non, doesn’t matter much as long as you change it.

HPGO should work nicely.
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Old 11-16-2018, 07:58 AM   #7
Sergio
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Default Re: Rear gear oil

While in the absence of any documentation I agree with the generic "application" recommendation, the manufacturer specifically recommends SAE30 oil for this application.

There are many types of trans-axle gears, the Graziano does not use the hypoid type gears that would benefit from the protection provided by the gear oils.

Sometime additives can be an issue as well as some are corrosive to yellow metals and while I don't know if any copper, brass, etc alloys are used in pins or seals in Graziano trans-axles, I personally would go by what the folks that designed the equipment recommend.

This is what I use:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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Old 11-16-2018, 11:34 AM   #8
NoleFan4Ever
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Default Re: Rear gear oil

Qman97- Whatever you decide on, the most important thing is to know your usage and plan accordingly. Remember, our gears, engines, motors, transmissions, trans-axles, etc. etc. all came with a design spec. That means they were engineered for that design and spec'd out with those parameters. So, once you change those parameters with bigger motors, controllers, taller tires, lift kits, speeds, higher voltages, etc. you have now changed all the parameters for the original engineering specifications. That is when you either get it re-engineered for your current specifications, or seek advice from other knowledgeable professionals as you are here - as their are a lot of experienced professional on this forum. I can only share with you my training and knowledge that comes as an IBEW Master Mechanic and a Certified AGMA Gear Specialist with over 31 years experience in the industry....

(Yes, I have worked on or raced all of them from NHRA Super Stock L & P class race cars, to Nuclear Turbines and Turning Gears....(and have even been known to have ~maybe worked on a golf cart once or twice over the years...)
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Old 11-16-2018, 12:18 PM   #9
Qman97
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Default Re: Rear gear oil

Quote:
Originally Posted by NoleFan4Ever View Post
Qman97- Whatever you decide on, the most important thing is to know your usage and plan accordingly. Remember, our gears, engines, motors, transmissions, trans-axles, etc. etc. all came with a design spec. That means they were engineered for that design and spec'd out with those parameters. So, once you change those parameters with bigger motors, controllers, taller tires, lift kits, speeds, higher voltages, etc. you have now changed all the parameters for the original engineering specifications. That is when you either get it re-engineered for your current specifications, or seek advice from other knowledgeable professionals as you are here - as their are a lot of experienced professional on this forum. I can only share with you my training and knowledge that comes as an IBEW Master Mechanic and a Certified AGMA Gear Specialist with over 31 years experience in the industry....

(Yes, I have worked on or raced all of them from NHRA Super Stock L & P class race cars, to Nuclear Turbines and Turning Gears....(and have even been known to have ~maybe worked on a golf cart once or twice over the years...)

I appreciate all advice and take all into consideration. There are people on here with a boat load more experience than me and I am grateful for everyone's opinion. I looked this morning and I have 3/4 of a bottle of gear oil left over from the Subaru trans oil change. We run mainly on gravel no real hills dusty, hot weather and the salt air of the ocean so any extra protection such as thicker oil to me is better. Plus the lift kit and motor and tires like you stated will add stress so I figure what the heck I'll give it a try.

Thank y'all again for the advice and guidance I really appreciate everyone and the site, best source of info on the net!
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Old 11-19-2018, 09:41 PM   #10
yawood
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Default Re: Rear gear oil

Thanks for the chart Nole. I just changed mine and used fully synthetic 75W-85W. It's possibly a bit low but in our warmer climate it should operate closer to 85W than 75W. Next time I change it I'll go to 80W-90W.
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