Throttle Startup Setting ...

[Theowegian]

I figure Im dumber than the manufacturer, so I TRY to start it like the manual says. /forums/images/graemlins/smirk.gif

Kubota, L3130 owners manual, pp 21 says, "Set the throttle to about 1/2 way..."

WELL, ....MY halfway is typically about 1/3 way! /forums/images/graemlins/smile.gif

1/3 to 1/2 throttle makes sense to me and might to you, too.

dwight

edit:
Start up - 1000 rpms
Warm up - 1200 rpms.

 

[HEC]

Hi Doug,
My dealer recommends a higher than idle speed for warm ups up here in Me. as the manual suggests.I had the M5400 last year and it took for ever to warm up at idle in zero deg. weather, and that was coming out of a warm garage at start up.He mentioned something about oil circulation etc. and after doing what he suggested it warmed up much quicker.I usually start at idle as my tractor is in a 65 deg. garage and than go to around 1200 rpms for the warm up and that works fine for me.If mine was outside in the cold with a block heater on I would do the same thing,start at idle and go to around 1200 rpms. for my tractor.The Kubota people must know what is best.Good Luck,

 

[RoyJackson]

I'm with Bird on this...

The throttle is set at the lowest RPM, then, once the engine starts (and the oil light goes out), I increase throttle until the tach indicates 1200-1500 RPM. That's for warm up.

Same applies to cold weather except I'll use the glow plugs for 15-20 seconds before cranking the starter. Warm up RPM might be a bit higher then 1500 RPM...depending on the temperature.

 

[geneP]

My '89 Case IH manual says to increase the throttle about 1/3, but no more than 1000 rpm. The diesel revs slowly at startup so I can hold the rpms to about 800-900 until the oil pressure light goes out and circulates the oil a bit. I'll generally warm it at 1000-1200 a bit and then leisurely drive off to the the job at hand. The climate is relatively warm here, and I don't have any tractor work to do if the tempratures get below the lower 40's.

 

[ttowne66]

You guys are going to laugh but my dads JD 870 says set throttle to FULL THROTTLE start engine and immediately back off to 1200-1500. Don't think I'll be doing that!!!!!

Tom

 

[CT_Tree_Guy]

<font color="blue"> You guys are going to laugh but my dads JD 870 says set throttle to FULL THROTTLE start engine and immediately back off to 1200-1500. Don't think I'll be doing that!!!!! </font>

That is very interesting. Sure sounds odd, but I'm curious as to their reason for recommending that. I always hesitate to go against what a mfr. says to do, but if it starts well at low idle, I wouldn't want to start up at full throttle either. Seems to be that the way the pump and/or injectors were designed they don't deliver as much fuel at low idle as JD thinks the engine needs to start properly. Again, that is odd, I'd love to know where they're coming from on that one.

 

[cp1969]

AFIK, all governed, mechanical injection pumps start at full 'throttle', regardless of the position of the throttle lever. The position of the throttle lever only determines the speed that the engine will idle at once it has already started.

 

[flwiii]

When I started the JD2305 this morning, I followed the guidelines in the manual stating 1/2 to 3/4 throttle. It started but blew blue smoke all over. When I start it at the lowest throttle setting as I normally do, no smoke, and it runs at about 1200. I don't see the sense of loading up the cylinders when no throttle starts just fine. Anyways, it never gets cold here in Phoenix. This morning it was 58 degrees and reached a nice 71 degrees for the day.

 

[Mike_Lipke]

I have a BX. 10F degrees this morning. I tried the throttle at idle.
Glow plugs, count 10. 5 second crank-no start.
Glow plugs, count 15. 5 second crank-no start.
Glow plugs, count 20. 5 second crank-no start.

Put throttle at 1/2.
Glow plugs, count 10. 2 second crank-Houston, we have ignition!

In cold weather, I believe you need more than idle setting on kubotas for it to start. Blue smoke is normal. Look at a Caterpillar or big Komatsu some time when they start in below 20 degree temps. They burn blue for minutes, not seconds.

 

[MMM]

</font><font color="blue" class="small">( all governed, mechanical injection pumps start at full 'throttle' )</font>

My guess is those that reccomend full or half do not have the auto full fuel start option on govenor. I haven't had a chance to read my L175 service manual yet, but it sure won't start at low idle.

 

[rozett]

My Cub manual says to put throttle lever in 'middle' position and goes on to say "During cold weather.... improved starting can be obtained by putting the engine speed control lever in high idle position."

Generally, I start Ziggy in idle and then rev up to 1000 rpm once started. In real cold weather, I'll judge the 1000 rpm throttle position and start there.

 

[RoyJackson]

</font><font color="blue" class="small">( You guys are going to laugh but my dads JD 870 says set throttle to FULL THROTTLE start engine and immediately back off to 1200-1500. Don't think I'll be doing that!!!!!
Tom )</font>

Nope...no laughing...that's what my 790 manual says too. But that's not the way I start it.

 

[BGL990]

My 990 manual says full throttle to start, then back off to 1200-1500 rpm. I ignore the manual and pull it back to idle to start because:
1. I don't like the idea of revving too high instantly after startup
2. I'm pretty sure the governor does hold it wide open until it starts anyway
3. It has a high idle controller that keeps it at a decent speed for a while after startup.
3. Only once has it ever needed more than 1 revolution to start even at an idle setting. That one time it was about -35 deg C, no block heater, stored outside. Took about 3 seconds of cranking to start up.

 

[Yalerider]

A smidgeon above idle. Manual says 1000rpm but seems a bit much to me.

 

[NIXON]

As I understand it most,if not all diesels start at "full throttle " .
I leave my "throttle "at idle until oil pressure has been established, then advance( as the temp starts to rise) it to around 1200 rpm .
John

 

[SteveM]

I am no mechanic, but I have owned a bunch of circa 80s japanese diesels, and they all recommend (and require) a lot of throttle to start below freezing. My curren 1982? mitsu beaver needs at least a half throttle setting, and just as it takes off I gradually move the lever forward, so it is not like I am hitting huge RPMs. The kubota and massey that i had before were the same. This notion of automatic full throttle at startup is news to me; perhaps it applies only to newer direct injection machines. There is a significant change in the tone of the cranking if I set my throttle lever less than 1/2....so I know it is certainly affecting the fuel flow into the cylinder. BTW, a previous owner of my Kubota B6000 told me he had alot of trouble starting it in the winter, and it turned out he was leaving the throttle at near idle...it would crank forever and barely fire at that setting.

My two cents - there is a reason for the Deere manual recommendation.

 

[Scrounger]

In the summer a quarter throttle will work fine, but in the winter months I bet you'll find that you need half throttle to have the ole diesel start on the first shot. That is how the two Kubotas that we're using act anyway. YMMV however.