Caterpillar M50D:
Trouble start on

What is required by the logic card to close the line contactor? - have replaced batteries, ignition switch, tested 10 pt static diag - all OK, chk'd seat switch, shifter neutral, park brake, accelerator; if I manually close the line relay I can run the hyd pump. YET turn on ignition switch and get hyd pump error because line contractor does not close. All the accessories work ie lights, horn, strobe light. I think I probably got a corroded wire connection but where and on what?
Help??? Thks - Tom
  • Posted 4 Jun 2017 14:10
  • Discussion started by T0000
  • California, United States
Showing items 1 - 5 of 5 results.
Mr Abram
this is not a brother printer support forum
i think your confused about where you are here :oD
  • Posted 27 Mar 2020 01:06
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
The machine will search for your network and display a list of available SSIDs. When a list of SSIDs appears, press Up or Downarrow key to choose the SSID you want, and then press OK.
https://www.brotherprintersupport247.com/blog/resolve-brother-printer-error-state-windows-8/
  • Posted 27 Mar 2020 00:38
  • Reply by Suchi_Abram
  • New York, United States
yes the F6 is a hydraulic pump circuit error
you may want to check the D4P diode and T1P transistor,
if if checks ok then the pump driver board may have an issue.
check all the connections and wiring, make sure none are burned and have a good connection.
If you do not find any problems with the D4P or T1P transistor or the pump driver board then the problem may be in the logics.

the accelerator test does display those numbers in succession to test each led pickup sensor in the accelerator box so that is normal. If any of those led sensors are faulty then the accelerator test will not complete and the diagnostic will not continue till it is repaired or you skip that test to the next step.

as for the loose wires you found, yes they are most likely for accessory connections.
  • Posted 5 Jun 2017 23:32
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
Model M50D I think around 1998 manuf. Serial 6GC01587. I'm working off 927460 el drwg and the operation manual and part manual that was with the fork truck. Turning the ignition sw on gives a F then 6 error code flashing, hyd pump error per drwg. Pressing the accelerator does nothing unless I didn't hold down the accelerator long enough. In the static test mode pressing the accelerator will give you a 1, 2, 3 number in display depending on how much depressed the accelerator. A extra comment there are two wires in the steering column that are disconnected. One black, one white neither with any wire numbers. The wires with numbers going to the ignition switch are per the drwg. I think the extra wires were for extra lights that have been removed. They seem to serve no purpose and have 36 volts on them. I think that's about it! Thks
  • Posted 5 Jun 2017 05:43
  • Reply by T0000
  • California, United States
what is full model and serial number?
what is showing on display when you press accelerator? it should display a code during error state.
  • Posted 4 Jun 2017 22:00
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com

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