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By HISUN Sector 750 EPS Failu
"Mrs. Smith" doesn't like how loud our Sector 750 is. On a HISUN forum someone said the same thing about his 750. I haven't given it much thought because I've been more focused on stuff that has broken.
So, I used my decibel meter to check ours out. 4000 RPM, Low gear, under 20 MPH . . . . 97 decibels. That's above most ordinances, even state boat noise limits.
AI Overview Ninety-seven (97) decibels is considered very loud and dangerous to hearing with prolonged exposure, roughly equivalent to a newspaper press, a loud nightclub, or a snowmobile. At this level, damage can occur after just 30 minutes, necessitating hearing protection -
By Rmillerdesigns
Hello. I have a 2016 Massimo MSU 500. I was putting on a lightbar and i screwed up and didn't disconnect the battery so when i was taking of the positive cable to put on the power from the lightbar it sparked and now the utv has no power. I turn the key over and all i hear is a chirp. No lights or anything. Everything that comes from the battery to the jumper box up by the battery shows voltage but anything coming out does not such as to the winch or anything like that
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By Andy Dickerson
So heard the grinding noise on the drive shaft a couple of times while going down a steep hill. Never heard this before going down the same hill. I already knew about the splines wearing out because of improper heat treating so I went through the process of removing the shaft to just replace it. A lot things need to be removed to get that thing out. Once I had it remove I didn't see any wear on the splines but what I did notice was the rear spline to rear differential had ZERO grease i.e. it was completely dry and I could see rust that had developed on the shaft splines and inside the differential mating surface. The front of the shaft where it connects to the transmission was well greased. Both ends of the shafts have springs in them with the rear spring being multiple times heavier which would force the shaft to mate securely into the transmission. Unless of course the rear is rusted and starts sticking which is what I think was happening. If the rear splines begin to rust and it starts sticking and the spring doesn't have the enough force to overcome the sticking because of the rust, the shaft will not get fully seated into the transmission. If this starts happening frequently it will eventually eat up the front splines on the transmission side shaft splines which is exactly what I see in the pictures of stripped splines.
I don't know why the rear spline shaft wasn't greased but this would cause it to eventually stick. I have been concerned about this ever since reading about it so as soon as I heard the grinding I stopped driving it. Thankfully there wasn't any wear. I'm wondering if this was deliberate or just laziness by the assemblers. It makes no sense not to grease it. The repair manual that I purchased from motorcycle doctor specifies to grease the splines. Both shaft ends have a rubber seal meaning there's is supposed to be grease in there.
I used to have a gold wing and there is a special grease required for the rear drive differential which happens to be a spline shaft setup. They use a lithium grease with moly. I had purchased a couple of tube of Magnalube-gx that I never used as I sold the bike. The Hisun manual recommends using a lithium grease which doesn't have the additives of a lithium moly grease that is specialized for spline shafts. Per magnalube website. "Magnalube-GX, however, uses a proprietary matrix of advanced polymers, molybdenum disulfide, and PTFE, so it stays where you put it without getting pressed out, while also maintaining a low frictional drag."
Anyway, long story short everything is back together and no noise. I would recommend those that haven't checked the grease in the splines on both ends to do so before the shaft get destroyed. Especially If you have heard grinding. Those rubber boots can be pulled back without having to take to many parts off. If you've been hearing grinding then there is probably significant wear already and time to replace the shaft and grease it properly.
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By Stubbsmobile
Hey yall,
Helping a friend out. he purchased a 2020 massimo buck 400 utv. has about 100 hours on it. after starting the engine, shifter in low, it does fine. when shifted to high gear, most of the time it acts like its not in gear completely, and it pops out and grinds bad. when you can get it in high gear, it acts like something is binding and it wont hardley roll before it jumps out of gear and makes that grinding noise. almost like trying to dr4ive a standard transmission car and start off in 3rd or 4th gear.
I have been on this site for several hours now, and totally understand the overall feeling about massimo utv. I can only imagine trying to find transmission parts when other members cant even find a fuel filter, lol.
A new transmission is (part#47516) $1159.99 plus tax and freight.
anyone have any other ideas or suggestions on what is causing the noise in high gear and not wanting to move?
Thanks ,
Chris
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By jugliner
I have a fuel injected UT400 that will start and idle, but surges and sputters at higher speed. It has been sitting for 2-3 months and was fine when parked in garage. I assumed it was a fuel/air problem and pulled the throttle body and cleaned it up. I've ended up replacing the injector, IAC valve, MAF Temp Pressure Sensor, and fuel filter. I've also checked the spark plug, Still surging. I reset the ECU after every component swap.
I plan to pull the throttle body again and look evrything over for any visible leaks, etc.
Any suggestions would be appreciated on next steps. The problem developing after sitting makes me think it should be something simple, but I'm stumped. BTW the fuel was fresh and treated with Stabil.
Thanks.
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