Hisun will not change gears while running

[Buck]

My father-in-law has a Hisun 750.  It has started to not change gears while running.  He can turn it off, change gears, then restart and it will change.  I thought it might have something to do with the brake but can’t find any info.  Thanks in advance for any info.

 

[T Fox]

How many rpms? Mine does this when idling is high. When it got warm I had to change the oil for the 5w40 winter to the 15w 40 for the summer.

[Greg Kilgore]

There is a safety switch (I think) that is supposed to prevent you from shifting gears without having you foot on the brake. That switch is also supposed to prevent you from starting the machine in gear without having you foot on the brake. I'll take a quick look and see if I can locate where it is. I think it is by the brake light switch at the base of the brake pedal. 

Kinda like the switch that kill the engine of a riding mower if you get off the seat with the blades engaged or in gear and fall off.

 

[Joe Breaux]

Yep, brake safety switch would be my guess too. Will it start in gear with foot on brake

[Greg Kilgore]

Well as usual I'm wrong. There is a pin that prevents it going into reverse unless the brake is applied. But didn't see anything about a separate switch on brake pedal for shifting. Could be the brake light switch has multiple purpose.  I'd check it anyway just to make sure. And check the shift linkage. See pics below. 

 

 

Good luck.

[Joe Breaux]

You know you can't shift moving ,right?

[Greg Kilgore]

BUCK,

I have an Axis 500. I have no shift issues. Haven't changed anything with brake pedals.

With engine running, I can go 

N to HI or LO with no brake

LO to HI or N with no brake.

LO, HI, or N to R have to have brake.

R to N, HI or LO no brake.

Start in any position with no brake.

Don't shift to any gear rolling.

I'd check the linkage on your father-in-law's machine. 

[Joe Breaux]

InYou know you can't shift moving ,right?

[Buck]

Anyone think it could be a clutch issue?

[Buck]

1 hour ago, Joe Breaux said:

InYou know you can't shift moving ,right?

Yep know that.  

[Buck]

2 hours ago, Greg Kilgore said:

BUCK,

I have an Axis 500. I have no shift issues. Haven't changed anything with brake pedals.

With engine running, I can go 

N to HI or LO with no brake

LO to HI or N with no brake.

LO, HI, or N to R have to have brake.

R to N, HI or LO no brake.

Start in any position with no brake.

Don't shift to any gear rolling.

I'd check the linkage on your father-in-law's machine. 

He said he checked the linkage.

[Joe Breaux]

12 hours ago, Buck said:

Anyone think it could be a clutch issue?

Could be

[Greg Kilgore]

On 8/2/2024 at 8:27 PM, T Fox said:

How many rpms? Mine does this when idling is high. When it got warm I had to change the oil for the 5w40 winter to the 15w 40 for the summer.

Since the linkage seems to be good.

As T Fox asked, what is the RPM when trying to shift into gear while running.

High RPM could be an issue. And at high RPM the clutch would be trying to engage/engaged also. Putting pressure on the shaft attached to the primary sheave. Trying to move the CVT belt. Making the secondary sheave engage. And the secondary sheave is attached to the shaft that turns gears in the transmission.

And the clutch is in an oil bath also.

[Joe Breaux]

😒Any resolution to the problem?