Go BottomThrottle - warm up
 | sprobst
Join Date: Nov 2003 Posts: 17 Indiana 
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2005-01-24 104800
I have a relatively new TC30. I've never owned a diesel before.
Especially in the cold weather (30F and colder), what throttle position/RPM should I let it warm up in? Lately, I've been warming up at 1000RPM for about 10 minutes.
In summer, is a warm up period necessary?
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 | beagle
Join Date: Jan 2004 Posts: 1333 Michigan 
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2005-01-24 104801
It is generally recommended that you run at idle for about 30 seconds, until clear exhast, then set the throttle at about 1/2 of the operating RPMs. Idle doesn't produce enough heat to properly warm all the hydraulic oil you need to lubricate the drive system.
Above 40 degrees, it is still a good idea to let the tractor warm for about 5 munutes. Below 32 degrees, it is really important that you follw the warm up times in your owners manual. Hydrailc system and drive train problems can occur if you operate the systems cold.
The diesel won't produce enough heat at idle to properly warm-up the systems. ....
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada 
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2005-01-24 104802
At any time of year a diesel, or any other engine, should be allowed to warm up a little before it is made to do any work. In most cases gentle work is a good way to warm it up since engines don't make much heat at idle.
However a diesel makes almost no heat at all when it's just idling, the problem is made worse by there efficient cooling system which usually gives off about as much heat as the engine can produce at idle.
For most small diesels, like those in a CUT, 1,000 RPM is not enough to make much heat in the cold weather, you need about 1,200 - 1,400 RPM to make much heat.
The engines also like about that much throttle in order to start efficiently. Anything more is too much fuel and less requires too much cranking.
The simplest way is to set the hand throttle to about 1,400 RPM before shutting off the engine when you park it, that way when it comes time to start it back up later the throttle is preset to the right point.
Best of luck. ....
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 | Chief
Join Date: Jul 2003 Posts: 4297 Southwest MiddleTennessee
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2005-01-24 104806
I installed a block heater on my engine and plug it in about an hour before I plan to use the tractor anytime when it is cold or cool outside. It starts fine without the block heater but warms up very slowly. With the block heater, most times the temp. gauge indicates some warm up already before I attempt a start. Once started, I let it idle at minimum rpm until the exhuast cleans up and then set the throttle at about 1,200 rpm. ....
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 | DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada
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2005-01-24 104829
1400-1500 works well as a start-up/warm-up RPM. That is also where Kubota sets the idle speed on the RTV 900. So there is a clue.....
Also, I have been paying attention to how long it takes to warm up the HST fluid.
At +15 degrees there is frost on my top and tilt controls. After ten minutes running at 1500 rpm's the frost is melted and the metal fittings are starting to get warm to the touch.
....
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| beagle
Join Date: Jan 2004 Posts: 1333 Michigan
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2005-01-24 104835
Yep, about 10 minutes it what it takes for my FEL float detent to thaw and start working. Good indication that the machine is ready for work.
Since the frictional losses are highest at the valves, I would suppose they probably warm faster than other parts of the system. ....
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