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PD warning light
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Marlyn nwia View Drop Down
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Joined: 11 Sep 2009
Points: 378 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Marlyn nwia Quote  Post ReplyReply Direct Link To This Post Topic: PD warning light
    Posted: 30 Dec 2023 at 6:55pm
My D 17 IV has a PD pressure warning light: where as my D 15 II does not.
same vintage, what is the engineering rationale for one having it and not the other?
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tbran View Drop Down
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Joined: 14 Sep 2009
Location: Paris Tn
Points: 3294 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tbran Quote  Post ReplyReply Direct Link To This Post Posted: 30 Dec 2023 at 7:00pm
Well, be kind of hard to put one on a D15 as the plumbing is internal - the IV has extermal lines and filter - EZ to put a sending unit there.  Some D15's show a cooler and the industrial unit had external cooler and plumbing - just no sender.  Rationale is usually cost...
When told "it's not the money,it's the principle", remember, it's always the money..
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20485 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 30 Dec 2023 at 8:59pm
The light was for the Power Director filter, of which a D-15 doesn't have a Power Director filter.
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EPALLIS View Drop Down
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Points: 1131 		Post Options Post Options   Thanks (0) Thanks(0)   Quote EPALLIS Quote  Post ReplyReply Direct Link To This Post Posted: 31 Dec 2023 at 9:26am
A long time back, the good Dr responded to my question about the D-17 Power Director red light.  I kept the response because it is spot on!  See below.  Thanks again Dr.  Allis.  Much appreciated and Happy New Year!
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EPALLIS View Drop Down
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Points: 1131 		Post Options Post Options   Thanks (0) Thanks(0)   Quote EPALLIS Quote  Post ReplyReply Direct Link To This Post Posted: 31 Dec 2023 at 9:29am
As quoted from Dr.  Allis:
Only D-17 series 3 and 4 models had that red light.  The D-19's also had it. When it is OFF, that indicates that the internal lube pump is circulating hydraulic oil to the filter (under the battery tray). It comes ON when the foot clutch is pushed in (lube pump stops rotating) or when the engine is idling with hot hydraulic oil. When cold and idling, the light is probably OFF.  If the hydraulic compartment is extremely low on oil, I would expect it to be on quite a bit.

Edited by DrAllis - 19 Dec 2021 at 4:47pm
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