Yale ERC050:
no drive

This truck will not drive forw or rev,contacts pull in, no scr hum.Drive motor,cables,contacts and fuses check out.
TB #1 thru #6 voltages check out. This unit has the EV 100 system.
Any ideas
  • Posted 16 Feb 2011 12:32
  • Discussion started by BrewCrew
  • Ontario, Canada
We`re here for a good time
Showing items 1 - 7 of 7 results.
the tests indicated a faulty card, I changed it out and all is good now,
Thanks for all the info and guidance.
  • Posted 24 Mar 2011 07:21
  • Reply by BrewCrew
  • Ontario, Canada
We`re here for a good time
I will check it out Wed and report back, thanks for all the info
  • Posted 19 Feb 2011 11:07
  • Reply by BrewCrew
  • Ontario, Canada
Brewcrew,
If you had an Email address I could scan an send you fault finding chart for this fault, Dose this truck have an Earth leakage detector fit if not sure you will find it mount on steer colume under B.D.I. guage and hr meter.
1 Check Voltage at 1 Rec Terminal It should show Bat volts If not check power fuses and cables.
2 Check drive motor cables for open circuit also check contactors are closing correctly and making circuit,
3 Are the above checks correct. I f not rectifye cable or contact fault,
4 turn key switch on I rthink you may have done this part Check TB1 by six terminals and speed control dose the meter read between 3 and 4 volts if not replace logic card if yes depress S.C.U. note it is not necessaary to select Direction for this test. Dose the SCU fall to O If not check wiring to speed control wiring.
5 Check the Thermistor normal resistance of thermal protector is 120-150 ohms at 18*C when measured between PZ1 and PZ5 Replace if Faulty.
6 Test the current sensor a a short peice of bus bar with 2 wires attached to it book says it should have small resistance
it also says do not attemt to repair,
7 No 1 gate signal test.
1 set volt meter toDc range black lead of meter to No1 rec cathode, red lead to gate signal connection maybe blue and white wire.
2 Close keyswitch seat and hand brake switch dose voltage rise in relation to SCU depression. If not check all Z plug to all terminals on panel, Rectifye any open circuits if wiring checks out Ok fault lies in logic card. If voltage rises then no 1 rec is faulty.
All meter checks to be done in respectof negative,
Please make sure drive wheels are of the ground.
If you have an earth module fit Check for motor faults to earth That means all motors hoist as well as steer motors,

I know this is long winded but I hope it is helpfull

Regards Titus
  • Posted 19 Feb 2011 06:32
  • Reply by Titus
  • North Yorkshire, United Kingdom
They pull in and stay in. t2 is what,where and how to check, I don`t recall this
  • Posted 17 Feb 2011 21:57
  • Reply by BrewCrew
  • Ontario, Canada
We`re here for a good time
does the line or directional contacts pull in then drop out? what is the voltage at t2?
  • Posted 17 Feb 2011 21:10
  • Reply by edward_t
  • South Carolina, United States
"it's not rocket surgery"
Yes , the correct voltages in the right order.TB1 pot v sweep down, TB2 bat voltage, TB3 batt voltage with seat, TB4 batt volt with key, TB 5 batt volt in forw, TB 6 batt volt in rev.
You are right, it must be the pre LX ( no dash connector). Don`t think the unit has been washed, i was leaning towards the card ,could a bad #2 rec cause this?
  • Posted 17 Feb 2011 11:03
  • Reply by BrewCrew
  • Ontario, Canada
We`re here for a good time
when you say "TB #1 through #6 voltages check out" are you saying they go to the correct voltages in the correct order at the correct times or that they were correct "at rest" when you checked them?
Is this a "pre-LX ev100" that does not have the cable connection for the dash, and has trim pots behind a window where the cable plugs in on more modern machines?
it MAY be a bad logics card (did someone wash the truck?)
  • Posted 17 Feb 2011 09:35
  • Modified 17 Feb 2011 10:37 by poster
  • Reply by edward_t
  • South Carolina, United States
"it's not rocket surgery"

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