DB 1690 - wiring diagram, timimg

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JML996
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Location: England

DB 1690 - wiring diagram, timimg

Post by JML996 » Tue Nov 14, 2017 9:32 pm

Hello folks,

I'm new on here with my first post and see there's fantastic advice flowing freely amongst fellow DB enthusiasts, great pics too..

My Dad and I have just started to 'do up' his 1982 DB1690 and I have a couple of questions if I may;

Where would I find a wiring diagram for this tractor and where would I find timing instructions please?

Kind regards

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GeoffDEAL
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Re: DB 1690 - wiring diagram, timimg

Post by GeoffDEAL » Wed Nov 15, 2017 6:06 am

Hi i got a wiring diagram from this site go information--FAQ s then wiring diagrams, are you saying about timing as in timing gears or to injection pump timing relating to the timing gear marks if the timing gear marks are all aligned up including injection pump gear, timing is correct. The basic I & T manual c-36 is worth having covers the usual stuff. I also have a 1690t 4wd excellent tractors

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ollek
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Re: DB 1690 - wiring diagram, timimg

Post by ollek » Wed Nov 15, 2017 8:03 am

For the wiring diagram, try the following link http://dbtc.co.uk/mediashare/wj/0y6lgcr ... dc-org.jpg

JML996
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Joined: Mon Oct 09, 2017 8:02 pm
Location: England

Re: DB 1690 - wiring diagram, timimg

Post by JML996 » Wed Nov 15, 2017 10:20 pm

Thank you very much Ollek, appreciated..

GeofDEAL, thank you, I'll check out that site.

Re the timing, there is an oil leak between the front of the block and first casing where the various timing gears are, e.g. fuel pump, cam, crank and power steering. We want to remove this casing to sort said leak (weep) and this means removing the gears. I want to make sure we put it back together correctly.

Please excuse my ignorance, what is an I & T manual (Haynes or similar?) and where would I get one?

We've used David Brown tractors on the farm from before I was thought of, so they have a special place for me. As well as the 1690 which was from new, we also have a 996 from new and a second hand 880 with loader, all used but in generally good condition.

There was one other thing that is puzzling me with the 1690, before it's started we have to operate the lift pump, almost like priming the main pump. Would there be something asmis in the lift pump which might cause the fuel to drain back to the tanks? Is this a known issue?

Many thanks

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GeoffDEAL
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Re: DB 1690 - wiring diagram, timimg

Post by GeoffDEAL » Thu Nov 16, 2017 4:46 am

Hi JML just had a look at my manual it is printed in USA but is available most places not as good as a DB workshop one but not as expensive I & T shop service manual. My 1690 was like that several years ago needs a kit in the pump or a new lift pump, watch if you put a new pump on to replace the original gasket if it is a thick type one, i put the new gasket that was with the pump and i think it put to much pressure on the cam lobe and wore it down !! so i ended up putting an electric pump in the line before the lift pump, also the push rod that operates the lift pump can wear and results in part pumping, have the length it should be somewhere will look it up. If you are removing the timing gears ect get no1 cyl on TDC with all dots on all gears matching up then remove everything without moving the motor then put it all back the same will be the same as you started. Have had DBs here for 67 years since the first Cropmaster no other working tractors only DBs . cheers Geoff

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GeoffDEAL
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Re: DB 1690 - wiring diagram, timimg

Post by GeoffDEAL » Thu Nov 16, 2017 5:01 am

New lift pump pushrod is 36mm long cheers Geoff

JML996
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Location: England

Re: DB 1690 - wiring diagram, timimg

Post by JML996 » Thu Nov 16, 2017 6:10 pm

Thank you GeofDEAL,

I'll look up David brown parts to see if the lift pump kit is available and go from there. Re the timing gears, I think that's the best solution, just need to take the time and turn her over until all the dots line up.

Kind regards

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db2d
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Re: DB 1690 - wiring diagram, timimg

Post by db2d » Thu Nov 16, 2017 7:18 pm

If timing marks are not present, numbers on the gears indicate tooth numbers, counting from tooth number 0 to be aligned.
If timing marks are present it can take up to fourtyseven revolutions to align the marks.

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GeoffDEAL
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Re: DB 1690 - wiring diagram, timimg

Post by GeoffDEAL » Thu Nov 16, 2017 8:16 pm

Hi JML on Google search the I & T manual is on Clymer manuals for 22.90 pound or Ebay for $34.50 should be available at most manual suppliers. cheers Geoff

JML996
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Location: England

Re: DB 1690 - wiring diagram, timimg

Post by JML996 » Thu Nov 16, 2017 8:45 pm

Thank you db2d, timing marks (dots) are clear so will turn until all lined up, at least I have an idea of the max amount of turns before getting them to line up... :)

GeoffDEAL, thanks again.

Just thinking again about the DB's we've had on the farm, before my time Dad had a 1412, (traded in for the 1690), a red 880 and I think a red 990 or 950.

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db2d
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Re: DB 1690 - wiring diagram, timimg

Post by db2d » Thu Nov 16, 2017 9:24 pm

The manual is available from davidbrownparts.com

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GeoffDEAL
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Re: DB 1690 - wiring diagram, timimg

Post by GeoffDEAL » Fri Nov 17, 2017 3:59 am

Hi JML tractors here started with dad getting a new Cropmaster traded for 30c ,red 990 traded for 1200 then 1494 2wd 1394 4wd second 1200 --1690t 4wd two other super Cropmasters along the way for restoration and recently a 1949 good running Cropmaster so only two traded along the way rest still here 67 years of them .

JML996
Posts: 5
Joined: Mon Oct 09, 2017 8:02 pm
Location: England

Re: DB 1690 - wiring diagram, timimg

Post by JML996 » Fri Nov 17, 2017 6:01 pm

Hi GeoffDEAL,

Great line up......with great history

I've just started to match plough here in the south west of England with the 996 and there are quite a few Cropmasters and 20D/25D around doing the same, great to see them out 'working'.

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