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Offline Dspagz

Gear oil coming out of vent tube on rear differential
« on: August 03, 2022, 12:20:24 PM »
Anyone know why I have gear oil coming out of the vent tube on my rear differential. Drained it and put exactly 400ml back in as per my owners manual but still leaking out of tube.

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Online NMKawierider

Re: Gear oil coming out of vent tube on rear differential
« Reply #1 on: August 03, 2022, 12:52:39 PM »
Most often it is because it was or is overfilled..was being that there is still some up in the tube that gets pushed-out as the air in the diff heats and expands. Pull the tube, hit it with some compressed air to clear it...but it will make a mess on the end so maybe catch it in a rag.
2015 Z Force 800 53/Trail EPS
Custom Air Intakes | Custom Exhaust Mod | SuperATV Harness | Custom Fenders | Custom Skid/Rock Sliders | 27" GBC Grim Reapers | Seizmik Mirrors |Конструктор Doors | Dr Pulley Sliders | 1.5" Wheel Spacers | BENZ Silencer (as needed) | SATV Flip Windshield W\ Rear Shield | Dual Light Bars | Diamond Plate Storage |7- 9.7" GPS Systems | Bandit Springs Rear & Gen-3 Shocks Front | Cage Chop Mod

My Videos On YouTube

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Offline Super 8

Re: Gear oil coming out of vent tube on rear differential
« Reply #2 on: April 22, 2024, 07:21:04 AM »
Odd, I had this issue yesterday after 500 miles which made a mess. If mine was overfilled, should have happened by now?

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Online NMKawierider

Re: Gear oil coming out of vent tube on rear differential
« Reply #3 on: April 22, 2024, 09:54:03 AM »
Odd, I had this issue yesterday after 500 miles which made a mess. If mine was overfilled, should have happened by now?
I ran mine overfilled sense the start and had no problem until I ran a few runs down open roads at 30+ MPH for miles. Even then it was just enough to kick some out and drop on the muffler heat shield and smell. Next oil change I will put in only what the book says but until then my little catch-can mod is taking care of it. Think it's in the How-Tos.
Large discharged indicates either overheating... or additional expansion from water in the oil.
« Last Edit: April 22, 2024, 09:56:22 AM by NMKawierider »
2015 Z Force 800 53/Trail EPS
Custom Air Intakes | Custom Exhaust Mod | SuperATV Harness | Custom Fenders | Custom Skid/Rock Sliders | 27" GBC Grim Reapers | Seizmik Mirrors |Конструктор Doors | Dr Pulley Sliders | 1.5" Wheel Spacers | BENZ Silencer (as needed) | SATV Flip Windshield W\ Rear Shield | Dual Light Bars | Diamond Plate Storage |7- 9.7" GPS Systems | Bandit Springs Rear & Gen-3 Shocks Front | Cage Chop Mod

My Videos On YouTube

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Offline Super 8

Re: Gear oil coming out of vent tube on rear differential
« Reply #4 on: June 03, 2024, 08:16:01 AM »
Drained and installed 400 ml Mobile synthetic 75w-90 in the rear axle, so far so good.

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Offline Super 8

Re: Gear oil coming out of vent tube on rear differential
« Reply #5 on: June 04, 2024, 08:11:47 AM »
Spoke too soon, did it again last night.

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Online NMKawierider

Re: Gear oil coming out of vent tube on rear differential
« Reply #6 on: June 04, 2024, 08:49:28 AM »
Spoke too soon, did it again last night.
Might be time for the catchcan mod. Mine hasn't done it after I did it and I still over-fill it.

https://cfmoto-forum.com/how-to's/oillube-catchcan-mod-for-ifferencials-and-gear-cases/
2015 Z Force 800 53/Trail EPS
Custom Air Intakes | Custom Exhaust Mod | SuperATV Harness | Custom Fenders | Custom Skid/Rock Sliders | 27" GBC Grim Reapers | Seizmik Mirrors |Конструктор Doors | Dr Pulley Sliders | 1.5" Wheel Spacers | BENZ Silencer (as needed) | SATV Flip Windshield W\ Rear Shield | Dual Light Bars | Diamond Plate Storage |7- 9.7" GPS Systems | Bandit Springs Rear & Gen-3 Shocks Front | Cage Chop Mod

My Videos On YouTube

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Offline Super 8

Re: Gear oil coming out of vent tube on rear differential
« Reply #7 on: June 04, 2024, 05:44:24 PM »
Spoke too soon, did it again last night.
Might be time for the catchcan mod. Mine hasn't done it after I did it and I still over-fill it.

https://cfmoto-forum.com/how-to's/oillube-catchcan-mod-for-ifferencials-and-gear-cases/
It would have to be much larger than that observing the amount that pukes out.

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Online NMKawierider

Re: Gear oil coming out of vent tube on rear differential
« Reply #8 on: June 04, 2024, 07:27:54 PM »
Spoke too soon, did it again last night.
Might be time for the catchcan mod. Mine hasn't done it after I did it and I still over-fill it.

https://cfmoto-forum.com/how-to's/oillube-catchcan-mod-for-ifferencials-and-gear-cases/
It would have to be much larger than that observing the amount that pukes out.
You have something else going on then. Are you sure there is no water or moisture in it? How hot is it running?
2015 Z Force 800 53/Trail EPS
Custom Air Intakes | Custom Exhaust Mod | SuperATV Harness | Custom Fenders | Custom Skid/Rock Sliders | 27" GBC Grim Reapers | Seizmik Mirrors |Конструктор Doors | Dr Pulley Sliders | 1.5" Wheel Spacers | BENZ Silencer (as needed) | SATV Flip Windshield W\ Rear Shield | Dual Light Bars | Diamond Plate Storage |7- 9.7" GPS Systems | Bandit Springs Rear & Gen-3 Shocks Front | Cage Chop Mod

My Videos On YouTube

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Offline Super 8

Re: Gear oil coming out of vent tube on rear differential
« Reply #9 on: June 04, 2024, 09:56:45 PM »
Spoke too soon, did it again last night.
Might be time for the catchcan mod. Mine hasn't done it after I did it and I still over-fill it.

https://cfmoto-forum.com/how-to's/oillube-catchcan-mod-for-ifferencials-and-gear-cases/
It would have to be much larger than that observing the amount that pukes out.
You have something else going on then. Are you sure there is no water or moisture in it? How hot is it running?
I just completely drained it. I can check with a heat gun.

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Online NMKawierider

Re: Gear oil coming out of vent tube on rear differential
« Reply #10 on: June 05, 2024, 09:10:03 AM »
So no water ...one thing checked-off. Any odd noises especially during deceleration?
2015 Z Force 800 53/Trail EPS
Custom Air Intakes | Custom Exhaust Mod | SuperATV Harness | Custom Fenders | Custom Skid/Rock Sliders | 27" GBC Grim Reapers | Seizmik Mirrors |Конструктор Doors | Dr Pulley Sliders | 1.5" Wheel Spacers | BENZ Silencer (as needed) | SATV Flip Windshield W\ Rear Shield | Dual Light Bars | Diamond Plate Storage |7- 9.7" GPS Systems | Bandit Springs Rear & Gen-3 Shocks Front | Cage Chop Mod

My Videos On YouTube

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Offline Super 8

Re: Gear oil coming out of vent tube on rear differential
« Reply #11 on: June 06, 2024, 07:30:57 AM »
So no water ...one thing checked-off. Any odd noises especially during deceleration?
No, 600 miles on machine.