BX23 solenoid location

[Berniep]

Originally Posted by Volfandt

Berniep, if you've got a multimeter you can test your safety switches by unplugging the stop solenoid connector and plugging your meter into the connector, then do your tests with just the key switch on, simulating a run condition, It'll save you fuel $$$'s and wear and tear on your engine

I know the seat switches work, they will shut the tractor down. They just don't engage the timer. I can hear the timer click off after shutdown with the key.

[Volfandt]

Best I can tell, the timer relay has a double acting relay coil and a set of Form C contacts. It is either energized in the run position, reversed energized in a timed stop position or unenergized in a neutral "break" position when power is off. Similar to how the 3 way current limiting relay in a electo-mechanical voltage regulator works.

In the "run" position (key on, switches made), 20amp fused current flows from the key switch - through the safety switches to the timer relays "run" coil windings which pulls the run contacts closed which passes the 15amp fused current to the timer circuit to charge it up.

In the "stop" position, (key off and/or one of the safety switches open) the 20amp fused current is removed from the "run" coil and the charged up timer circuit is sufficently charged up enough to overcome spring tension and pulls the contacts in the opposite direction, and "makes" the "stop" contacts. The 15amp fused current is now passed on to the stop solenoid. Once the timer circuit hits a preset time (approx 10 -15 secs, probably dependant on some sort of capacitor discharge rate), current is then removed from the "stop" windings and spring pressure returns the contacts to their neutral position. This is how current flow is removed from the stop solenoid after the timer expires.

If one were to disconnect the electrical connectors to the fuel pump and stop solenoid, (or connect up a multimeter to the timer relay), you would hear/see the timer relay click into the "run" position when the key was turned on, then hear it click into the "stop" position when either the key is turned off or one of the safety switches is opened. Then after approx 10 -15 secs you would hear/see the timer relay "break" from the stop position and return to it's neutral "off" position.

Course since theres no schematic or troubleshooting reference on the timer relay this is just an uneducated guess. This seems to be the way the circuit works on my 04 BX23, your use may vary

[redridinghood]

My understanding is that it (061700-3770) energizes for a fixed period once power is applied to it regardless if the power is then removed (an old fashioned monostable in electronics terminology).
I have one in front of me, four pins: two rows of pins with a cut out at the top. I have no idea of the pin out please help me.

I am hoping you will be able to match up from your tractor diagram - whch is which - ie power in, ground in, trig signal in, output.

Just using a multimeter it is far from obvious to the casual observer!

I wish to use a couple for another application.

Best regards and thanks

[redridinghood]

Reading the rest of the thread - I think you will find that the reason the relays need to be mounted in the direction shown is so that they can be used as a safety switch - ie if the machine is upside down it will not start - it will not damage the relay but it will not fire that is give the pulse that allows other functions to take place for a fixed time (typically until a hold in relay of some sort is pulled in to keep things running).

[Volfandt]

Here's the WSM electrical schematic for the D905 BX23. It's best to print both out then match up and tape them together, it's much easier to follow.

[redridinghood]

Thank you for that - I printed in out and had a look. The timer relay had only 3 connections. The (061700-3770) has 4.

1 Output (+12) typically 5-8 seconds
2 Ground
3 Trigger signal (+12v)
4 +12v

We used a couple to drive some door opening solenoids. They work well! It was not before blowing the first pair up - got the O/P and Gnd the wrong way round - a bit of a sickener!

Looking at the base of the relay with the cutout at the top

top left Gnd
bottom left 12v
top right O/P
bot right Trig

Thanks again for the info.

good luck and best regards