i have a couple questions about power shift

[tradin1]

when i first start a 4220d the power shift takes a few seconds to engage, maybe 5-10 seconds. i am curious if this is normal or not. It never has any delay when shifting after the first start up. When the delay happens it occurs in either forward or reverse, but again this ONLY happens when i first start the machine. Looking for any advice.

thx

 

[winston1]

Never had a power shift but I think 5-10 seconds is longer than designed for. Have to ask about the strainer, spin on filter and proper fluid?

 

[blackd]

I also agree that 5-10 seconds is too long. When I had my FX24D it seemed to take 1-3 seconds, so I agree that the filter may be old/blocking.

 

[Vbull]

I have a 1720d that has always taken 5 seconds or slightly more when it is really cold to engage upon start up.
The 3 point lift and the loader work immediatly. I've changed the filter and cleaned the screen a number of times over the last 3 years
with no change. It works fine without any delay after it moves the first time. No problems otherwise in the last 200 hours of use.

 

[kenmac]

If there is any delay in mine, I sure don't notice it.. By the time I start it up ,raise the loader & box blade, let the clutch out, It's ready to go

 

[JCByrd24]

I never noticed a delay in my hydraulics until I read it on here, but my 186d has a delay in all hydraulics upon start up, even in summer time of a few seconds. I never need to move before I lift the loader or rear implement, but I have noticed in the cold (winter in Maine) the powershift is slow to move too. It got worse when I changed the hydraulic fluid, I think the new one is a little thicker in the cold. Last winter I added a heater for the hydraulic fluid and if I plug it in for an hour before starting everything is nice and quick like it was summer time. I changed the filter and cleaned the screen when I changed fluid. Nothing was neglected before but even with fresh fluid and filters there is a delay and I'm led to believe it's normal.

 

[California]

Considerable delay to have any hydraulics upon a cold start in both my YM186D's, probably more than ten seconds. Tractor Supply's better grade of UTF, 'Traveller Universal' in one, and Hy-Tran (same specs) in the other. Cold here means 40 degrees so I'm not experiencing true cold weather problems. Filters have low hours, screens are clean.

This is delay both to raise the 3-point, and also to engage the transmission after moving the lever.

It feels like there is long tubing to fill up before any hydraulic pressure is attained. Then the delay upon next start is proportional to how long it was shut down, maybe half that delay worst case. I thought this was normal since it is identical between both tractors.

Also, there is delay to release the brake bands inside the transmission. I've read that two gears' bands are engaged when in neutral so it won't tend to roll away. Starting off in high range after a cold start, this braking remains obvious for a few seconds. Likewise, identical on both tractors.


I just read Byrd's post while drafting this. That makes three YM86D's identically slow to attain hydraulic pressure.

 

[tradin1]

It's probably more like 3-5 seconds of delay, and the analogy of filling a tube to build pressure is what I pictured myself.

The fel and 3pt move instantly and the power shift delay is only for the first start of the day. The rest of the day no matter how many starts it never has the delay again.

It has fresh fluid, new filter and a clean screen.

 

[winston1]

It's probably more like 3-5 seconds of delay, and the analogy of filling a tube to build pressure is what I pictured myself.

The fel and 3pt move instantly and the power shift delay is only for the first start of the day. The rest of the day no matter how many starts it never has the delay again.

It has fresh fluid, new filter and a clean screen.

I can go along with 3-5 seconds but in no way think Yanmar designed or itended a 5-10 second delay in cold weather. No matter, if it works fine after start up and serviced properly I would go for it.

The 186 is one of the models that has the suction strainer high up in the transmission with a pick up tube. I could see where fluid would or could drain back some and require a little more time to pick up. Maybe the 4220 has that design. I don't know.

 

[kenmac]

If I'm not mistaken.. doesn't the powershift has it's own pump, Separate from the engine pump ? I'll have to look at my service manual