Cat Lift Trucks (& Caterpillar) 2EC25:
Code 20 no fwd or rev hydraulics work

Hello have this 2ec25 that has no forward or reverse but hydraulics work ok, this unit has the logic board, I've checked negative to frame with battery disconnected with about 10 bolts, ivebcheck for positive to frame and have 27.7 volts, also checked ohms, both were infinity, all contactors and fuses are good, thanks for any advice
  • Posted 1 Feb 2019 02:00
  • Discussion started by joshua_h
  • Michigan, United States
Joshua Hidey
Showing items 1 - 10 of 10 results.
ok joshua,
i looked and found out that if you put the truck in diagnostic mode and pull back on the lift and tilt hydraulic levers it will display stored fault codes. This may be what you might have done?

Anyhow, fault 20 is described as display showing code 20 and the action light (!) flashing: no lift truck drive operation.

Possible Causes:
- current limit potentiometer P1 out of adjustment
- Excessive drive motor current due to severe ramps, abuse or misapplication.
- Drive pulsing stall timer option set too short for application.
- 80% bypass option ON (option #15).
- current sensor defects:logics defect.

In the 'checks' section is says to:
- Verify current limit setting
- Do problem #16 procedure (this deals with checking current limit sensor and related wiring)
- increase value of option #12 (pulse stall timer)
- disable option #15 if ramp application requires more current than set with P1 current limit potentiometer. (change setting to '0').

Now with all this said yes, if the drive motor brushes are as worn as you say it could be causing a problem in the drive system that is making it see voltages or amp rate readings that will trick it into this code. So yes, change the motor brushes, clean it thoroughly and make sure the sensor wires etc are undamaged. Make sure your directional contactors are in good condition and the contact tips are good too.
Then run the truck and see if anything changes.
  • Posted 2 Feb 2019 15:29
  • Modified 2 Feb 2019 15:30 by poster
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
It does have the switch, I was looking at the customer truck this morning, the brushes for the drive motor are pretty much gone, I've never seen them so work out before.. the customer does their own upkeep.. would explain how they've gotten to that point.. so I am going to replace those first then kinda go from there, info on that board would be awesome, thanks swoop
  • Posted 2 Feb 2019 07:26
  • Reply by joshua_h
  • Michigan, United States
Does this panel have a DRS toggle switch?
DRS is diagnostic-run-setup modes
If you switch to diag "D" mode it will tell the logic to run a set diag ostic routine in a set order.
I'll have to check my info on what happens when it first initializes.
  • Posted 2 Feb 2019 05:54
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
Anytime ravikumar
  • Posted 2 Feb 2019 03:21
  • Reply by joshua_h
  • Michigan, United States
Thanks Joshua! it worked like sincere Thanks.
God Bless.
  • Posted 2 Feb 2019 02:58
  • Reply by ravikumar_g
  • Trinidad and Tobago
Ravikumar, 522598-4 is LPG lock off oorl ( out of range low )
You will need a new lock off valve kit that comes with a new pig tail plug end from take, cut back from the plug about 3 inches both wires, this will take care of that fault, afterwards go into the dash and clear all DTC's, only reason why hydraulics would be locked out is because the truck will not run? If there are other stored faults look for your most recent ones by checking the hour meter.. let me know if this helps. Thanks
  • Posted 2 Feb 2019 02:18
  • Reply by joshua_h
  • Michigan, United States

We are unable to get the ERROR codes for YALE anywhere on the net. I have error codes:522-598-4
HYDRAULIC INTERLOCK. Any information on troubleshooting will be appreciated.
  • Posted 2 Feb 2019 02:02
  • Reply by ravikumar_g
  • Trinidad and Tobago
Sorry no idea that last message posted twice, could this be a motor brush issue, these look well worn out
  • Posted 2 Feb 2019 01:19
  • Reply by joshua_h
  • Michigan, United States
Hey swoop, it's A2EC261813
It's not showing faults as I sit on the seat, it was only showing " 20 " on the dash when the logic board was in dish mode, when in operating mode it doesn't show any faults, it's actually showing a pump/drive motor with a gear in the center and another one with a drop of fluid but assuming it's low on fluid or needs to be changed as far as the symbol with the gear I'm unsure of, thanks
  • Posted 2 Feb 2019 01:15
  • Reply by joshua_h
  • Michigan, United States
what serial number is the lift?
and also what code is it showing on the display when the seat switch is closed,direction is selected and accelerator depressed? (it may show a code as soon as the lift is turned on, it just depends on the type of error).
  • Posted 1 Feb 2019 23:31
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!

Having trouble using the Discussion Forums? Contact us for help. accepts no responsibility for forum content and requires forum participants to adhere to the rules. Click here for more information.

Fact of the week
Pilots and co-pilots are required to eat different meals just in case one meal causes food poisoning.
Mafi MT30TT
Balling, Denmark
Used - Sale
Rail King RK330
Coraopolis, Pennsylvania, United States
New - Sale

PREMIUM business

Cascade Corporation (World HQ)
Leading manufacturers of attachments, forks and related technologies for forklifts and AGVs.
Upcoming in the editorial calendar
Feb 2024
Mar 2024

PREMIUM business

VETTER Forks, Inc.
The world's most comprehensive product range as well as the most intelligent sensor fork for more safety and efficiency.
Movers & Shakers
Kevin Royal Kevin Royal
Chief Financial Officer, Flux Power
Assistant National Sales Manager, Material Handling Division, New Age Industrial
Senior Vice President of Engineering, Tompkins Solutions
Chief Operating Officer, Clark Europe