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post #1 of 16 Old 08-11-2019, 02:50 PM Thread Starter
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Sluggish PTO on X748

I noticed the last two time Iíve mowed the first time I engage the PTO there was a long delay (3 or 4 seconds) before it engaged. I wonder if something is sticking in the PTO. About a month ago I hit a stump and bent a blade and killed the engine. I wonder if this could have caused a PTO problem. My 2012 X748 has 720 hours now.

Anyone experience this type of problem?

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post #2 of 16 Old 08-11-2019, 03:00 PM
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Re: Sluggish PTO on X748

My x475 has a few second delay when turning on the pto switch also. I think that's normal

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post #3 of 16 Old 08-11-2019, 03:13 PM Thread Starter
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Re: Sluggish PTO on X748

Thanks, Once it is warmed up the delay is gone. Cold fluid I suppose. But I don't remember it taking this long before the last few weeks.

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post #4 of 16 Old 08-11-2019, 05:30 PM
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Re: Sluggish PTO on X748

I guess I never payed any attention to if it takes longer while cold or hot. Next time I use it I'll try to remember to watch and then try to remember to report back my findings.

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post #5 of 16 Old 08-12-2019, 01:39 AM
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Re: Sluggish PTO on X748

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Originally Posted by ccsial View Post
I noticed the last two time Iíve mowed the first time I engage the PTO there was a long delay (3 or 4 seconds) before it engaged. I wonder if something is sticking in the PTO. About a month ago I hit a stump and bent a blade and killed the engine. I wonder if this could have caused a PTO problem. My 2012 X748 has 720 hours now.

Anyone experience this type of problem?
Are you at full throttle when you engage it? Mine is like: pull switch-one Mississippi, PTO starts turning, 2-Mississippi, it's full speed.

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post #6 of 16 Old 08-12-2019, 06:43 AM
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Quote:
Originally Posted by KHodges View Post
Quote:
Originally Posted by ccsial View Post
I noticed the last two time I’ve mowed the first time I engage the PTO there was a long delay (3 or 4 seconds) before it engaged. I wonder if something is sticking in the PTO. About a month ago I hit a stump and bent a blade and killed the engine. I wonder if this could have caused a PTO problem. My 2012 X748 has 720 hours now.

Anyone experience this type of problem?
Are you at full throttle when you engage it? Mine is like: pull switch-one Mississippi, PTO starts turning, 2-Mississippi, it's full speed.
Same here for my x595. It's always been that way, cold or hot. As soon as the switch is pulled the engine lugs down for a split second then recovers back to full speed within another second. And I've been mowing that large massively overgrown 25 acre field I mentioned in another thread for the last week - there have been several "surprise" ~2" diameter invisible tree trunks under the foliage that have stopped the blades cold and stalled the engine. (And one 3/8" steel cable!) No bent blades, no PTO issues. The photo shows some of the crazy crap I'm mowing down. That foliage to the left of the tractor is what I'm mowing in that section of the field, it is not the edge of the field. Really wish I had a brush hog. Click image for larger version

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post #7 of 16 Old 08-12-2019, 06:49 AM Thread Starter
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Re: Sluggish PTO on X748

I engage at half throttle. It has never waited for 3 or 4 seconds until recently. There was always a slight delay of maybe 1 second.

I'm not sure why it takes so long on the first engage. I wonder if sitting for a week it is sticking a bit and after the first time it then engages normally.

I had another thought. There must be a solenoid valve to engage the PTO. The spool could be getting sticky. I wonder if that valve is an integral part of the solenoid. It is probably not easy (expensive) to replace

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Last edited by ccsial; 08-12-2019 at 06:59 AM.
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post #8 of 16 Old 08-12-2019, 07:25 AM
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Re: Sluggish PTO on X748

Did you check hydraulic fluid level?
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post #9 of 16 Old 08-12-2019, 07:35 AM
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Re: Sluggish PTO on X748

My X585 always has had a little delay after pulling the PTO lever before you can hear it start to engage.
Always engages smoothly.
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post #10 of 16 Old 08-12-2019, 07:45 AM Thread Starter
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Re: Sluggish PTO on X748

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Did you check hydraulic fluid level?
Fluid level is good. The fluid and filters have always been changed on JD's schedule with JD parts and fluid.

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post #11 of 16 Old 08-12-2019, 08:14 AM
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Re: Sluggish PTO on X748

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Fluid level is good. The fluid and filters have always been changed on JD's schedule with JD parts and fluid.
Fluid level was my first guess when I read the original post. My X748 has about a 2 second delay on the deck, yet the delay on the hydro tiller is less than 1 second. Maybe check the solenoid on the back of the machine and make sure it is still good and tight. If nothing is too apparent and the deck is working like it should when it is on I would say monitor the times and if they get worse then dig deeper.

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post #12 of 16 Old 08-12-2019, 11:19 AM Thread Starter
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Re: Sluggish PTO on X748

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Originally Posted by mrbeef View Post
Fluid level was my first guess when I read the original post. My X748 has about a 2 second delay on the deck, yet the delay on the hydro tiller is less than 1 second. Maybe check the solenoid on the back of the machine and make sure it is still good and tight. If nothing is too apparent and the deck is working like it should when it is on I would say monitor the times and if they get worse then dig deeper.
Good plan.

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post #13 of 16 Old Yesterday, 04:18 PM
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Re: Sluggish PTO on X748

On my X534 the manual says to engage only at full throttle. I verified this with the dealer also.
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post #14 of 16 Old Yesterday, 07:32 PM Thread Starter
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Re: Sluggish PTO on X748

I know that is correct, but the diesel has so much torque half throttle works fine. I figure it is easier on the PTO. I disengae at half throttle too as I figure it is easier on the PTO brake. Maybe I'm wrong about it but I've been doing it for over 10 years.

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post #15 of 16 Old Yesterday, 10:02 PM
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On a diesel it doesn't matter. I've engaged my mower blades at idle with no issue. On a gasoline engine you'll stall it.
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