Cat High Flow Switch

Nige · Nov 11, 2020

Gotcha. I doubt if the electrical pinout/wire colours for that harness are available anywhere other than a factory drawing.
I'll ask around and see what turns up.
What's strange is that the schematic for the planer clearly shows an 8-pin connector and the poster says he has 9 wires.

EDIT: It would be strange if the wire colours & numbers in the "jumper" harness were any different to what's on the machine or what's in the planer though.

katsequipment · Nov 11, 2020

Nige said:
Gotcha. I doubt if the electrical pinout/wire colours for that harness are available anywhere other than a factory drawing.
I'll ask around and see what turns up.
What's strange is that the schematic for the planer clearly shows an 8-pin connector and the poster says he has 9 wires.

EDIT: It would be strange if the wire colours & numbers in the "jumper" harness were any different to what's on the machine or what's in the planer though.

That schematic doesn't match up. I still have 3 wires left. An orange, black and 1 more. I tried using that schematic and leaving those "extra" wires out but I keep blowing fuses.

katsequipment · Nov 11, 2020

Nige said:
Are you trying to mount the planer on a Cat skid steer.?
If yes, can you supply the S/N of the machine.
Would you also make a list of the colours and numbers of each wire in your photos above. I can see some of them but not others.

The plug in your 2nd photo doesn't look like a typical Deutsch plug as used on Cat equipment unless it's a trick of the photo. Maybe another photo from slightly further away.?

The plug looks wierd because it's the inside of the wiring harness still plugged into the machine.

I'm mounting it on a 262d, Dtb05585. All functions were working until we yanked the wires out.

katsequipment · Nov 11, 2020

I think the harness that I have is part of a conversion kit made to go from a 5 line system to a 3 line. The alleged part number for the harness in that kit is 378-3721.

Still can't track down a pin out.

heymccall · Nov 11, 2020

Can someone post up the PC306B HFP00001 and up schematic?

It may take us where we need to go.

As an aside, the original connector will have the socket latches broken and the wires will hot stay in.

Nige · Nov 11, 2020

heymccall said:
Can someone post up the PC306B HFP00001 and up schematic? It may take us where we need to go.

Here's the connector pinout for the HFP. 14-pin connector.
Promising. it shows pins G & H, plus L, M, & P all blank, just like the OP's photo.

Nige · Nov 11, 2020

heymccall said:
As an aside, the original connector will have the socket latches broken and the wires will not stay in.

Absolutely. It's going to need a new Deutsch connector for that end of the harness.

katsequipment · Nov 11, 2020

Nige said:
Here's the connector pinout for the HFP. 14-pin connector.
Promising. it shows pins G & H, plus L, M, & P all blank, just like the OP's photo.

View attachment 227575

This looks spot on. I'm gonna try it tomorrow. It's getting dark too early and it's pouring rain.

I'm kind of glad that the back wasn't on the plug. Instead of the wires just getting pulled out it could have been much worse.

I'll keep you guys posted. Thank you so much.

katsequipment · Nov 12, 2020

Nige said:
Here's the connector pinout for the HFP. 14-pin connector.
Promising. it shows pins G & H, plus L, M, & P all blank, just like the OP's photo.

View attachment 227575

Eureka!!!! You guys are the best. 3 different dealers couldn't help. A big weight has been lifted off my shoulders.

Do you mind if I share this with everyone? I'm sure I'm not the only one this has happened to.

Nige · Nov 12, 2020

Credit HMC. He was the one who supplied the clue where to look. All I did was to download the info........

Although I'd be interested to hear where the idea of looking in a different model for the wiring pinout came from......??

heymccall · Nov 12, 2020

Its all in the posts above, the clue, that is.
PC206 only ever came new with an 8 pin connector. "PC206 with 14pin" led to conversion instructions from Caterpillar kit.
Googled newer Caterpillar PC planers to get a newer model number, because I know that they have 14pin connectors and found the serial number range using avspare.
That's where I ran into brick wall, as I dont have SIS. And I couldn't pull a schematic from Google. I use AVSPARE . COM

Nige · Nov 12, 2020

Well done that man.......!!

katsequipment · Nov 12, 2020

I have another question. My 262d is an xps. I hear of the screen showing a high flow symbol when a high flow attachment is connected. How come my high flow option isn't activating when I attach this planar?

heymccall · Nov 12, 2020

Test both K & N on your planer harness and make sure that they are both connected to B. You may have a broken wire. Did it work before the plug was damaged this time?
Are you sure that you don't have another blown fuse from putting the pins in the wrong holes?

katsequipment · Nov 12, 2020

heymccall said:
Test both K & N on your planer harness and make sure that they are both connected to B. You may have a broken wire. Did it work before the plug was damaged this time?
Are you sure that you don't have another blown fuse from putting the pins in the wrong holes?

I replaced all the blown fuses. It didn't work before I pulled the wires.
I'll check it with my ohm meter tomorrow.

Nige · Nov 13, 2020

As HMC said you need to check the continuity of those two wires all the way back to the ECM. There was a case a couple of weeks ago where a break was found in a harness somewhere back in the machine that was preventing continuity in the necessary ground detection loop that the ECM uses to activate High Flow.

Here's a link to the thread - https://www.heavyequipmentforums.com/threads/cat-279c2-no-high-flow.85591/

If you would like an Electrical Schematic so that you can locate the harness connectors and stuff please ask. IIRC there is at least one (maybe two) major harness connectors between the one on the Lift Arms and the ECM.

Nige · Nov 13, 2020

Here's the Work Tool connector on the Schematic.
Wire C460 (Pin K) from the ECM needs to see ground via wire 200 (Pin B) in order to activate High Flow. C460 goes through 2 major connectors between the ECM and CONN 30 so dividing the harness into sections for troubleshooting would probably be the way to go.

katsequipment · Nov 13, 2020

Forgive my ignorance but is there a pic or description of what the high flow activation on the screen looks like? I have the upgraded screen with the backup can on my 262. When I hit the trigger to spin the drum I see what looks like a hydraulic symbol. Is that it?

heymccall · Nov 13, 2020

Easiest way for me to test for high flow activation.....

Operate planer drum with harness unplugged, then.....
Operate planer drum with harness plugged in.

Nige · Nov 13, 2020

Also sounds like you could use an Operation & Maintenance Manual. The first thing that usually goes missing when used equipment changes hands. They're available to download from Cat, or look for Cat Pulbication SEBU9084.
https://www.ebay.com/itm/Caterpilla...17-Operation-Maintenance-Manual-/143031687118

Cat High Flow Switch

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