[devan]

hello
I have a brand new u force 800 and when it has a load on it and in low range 4x4 or high its has a gear slipping noise.
has anyone got this problem?

[NMKawierider]

If it's only when it's in 4WD, I would say the actuator hasn't fully engaged it. You should take it in right away before any damage happens.

[devan]

it also does it in 2x4 high,low,reverse but then you have really put your foot down.
I have redone the motor and found that the selector drum path for the shift forks are machined away and the shift fork is kept in gear by springs so I made a new shift drum but I still have this clicking or gear slipping noise as before.

I have removed the rear drive shaft and tested in 4x4 and the front wheels just spin but no slipping noise
in high,low,reverse.
has anyone had rear diff problems?
I have checked diff oils for signs of metal shavings but only see a little amounts on drain plug.
I have about 900km on the clock.

[devan]

my next step is to remove rear diff to see if pinion gear hasn't cracked the casings inside flexing away from crown wheel.
so sad but true.
I think i'm the first to import the u force into south Africa.
also the (Henry Wang from tunemout) who I got it from gave me fake1 year fake warranty.

[devan]

please if anyone has had this problem and got it fixed please let me know what it is.
 it can save me a trip to CF Moto in china.
thank you

[Wheels]

I have seen the rear diff missing this weld, some slipped through the cracks.

[devan]

thank you.
I will remove the rear differential and check the crown wheel welded section.

[NMKawierider]

I thought you said this was a brand new machine. The warranty will be good. Call CFMoto, that will take care of it.

[Wheels]

He bought it through a third party provider, He will need to contact CFmoto China.
I would try Export8@cfmoto.com
This should get you the sales rep for your part of the world.

[devan]

I got the u force 800 in late September month and assembled it and on the 7th October 2016 I started it and sent pictures for my fake 1 year warranty.
I put on 500km for the break in period and done its first service.
I then loaded a tent and braai and some extra fuel on the cf for a 200km camping trip and on route a had a hill witch I easily climb with a rhino 660 the cf had this gear slipping noise and thought it probably not selected gear correctly and carried on.
it got worse and a contacted the guy I purchased it from and never replied and I even emailed cf moto china with no respond.
I then sadly had no choice but to trouble shoot and I removed engine.
pulled it apart and found a supplier on Aliexpress with parts to reassemble like gaskets main bearings ect.

I hope I get it running correctly again.
I machined up all the tools like pullers and stuff to strip engine as I own my own engineering business.
please check my clips on you tube of the problems I have.
thank you for all the responses.




 

[Wheels]

link to youtube please

[devan]

thank you for your information on the rear diff .
it had cracked on the weld and was the problem

[NMKawierider]

Unbelievable... Never thought that could happen. There's an adjustable stop that's said to not allow the ring gear to flex too far under high load. I wonder if that being too loose puts stress on that weld.

[devan]

the weld penetration is bad.
it would slip under load.
sounded like slipping gears.

[devan]

the adjustment on the outside of the casing had never touched the ring gear on mine.
maybe it was never set correctly.