Linde H40D:
394 Drive Fault

Can anyone out there help before I through myself off a cliff! I have a Linde H40D which has got a strange drive fault. The drive doesn't see to pick up correctly. The drive initially sets off then the engine seems to rev up but the drive doesn't pick up as it should, top speed is not met, nor rpm. We have checked both engine and linde ECUs for fault codes but nothing shows up. Boost pressures seem to be fine on engine. The only thing we can find is that the direction control solenoids (IY1 and IY2) will reach full 1200mA when the front wheels are lifted off the ground (ie wheels spinning) but when the truck is on the ground only 600mA is reached. The lift hydraulics do seem a little slow too, although full 2700rpm is reached in the end. We have checked the High Pressure for the drive and if we load up the drive (by pushing the truck up against another machine) full 425bar is reached, but the wheels will not spin.
Any Ideas, Anyone?
  • Posted 17 Apr 2018 05:51
  • Discussion started by GarySW1
  • Suffolk, United Kingdom
Showing items 1 - 13 of 13 results.
good day i have a problem with the linde forklift linde H50D the forklift starts, there is no error, but when the accelerator pedal is pressed halfway the forklift moves, if it is pressed all the way the forklift stays in place
Adamovic
Good on ya Gary
I have had the same issue but mine kept stalling at full lift when on relief.
  • Posted 3 May 2018 20:43
  • Reply by Lindetech
  • Auckalnd, New Zealand
We have managed to cure our machine! As explained we did not have any fault codes but the performance for drive seemed to be acting strange. The swash angle on the pump would not pull in correctly. In the end I suggested to the engineers to change all the fuel injectors. Low and behold, the engine picked up revs, the drive kicked in correctly, truck is perfect. The injectors had become blocked.
  • Posted 3 May 2018 16:09
  • Reply by GarySW1
  • Suffolk, United Kingdom
Hi Gary.
I have a very similar problem with the Linde H50D truck with the CBJB engine.
Hydraulic pumps are working well, but the stroller does not want to travel when the full pedal is pressed.

After some time we found a certain dependence.
Air flow meter - it does not work well. After replacing the new original bosch, the problem continues. Manual obscuration of the air flow meter changes the meter's display and the engine starts to work at full power. The boost pressure shows in the norm, but it does not draw well what the flowmeter incorrectly indicates (this is our theory).

We approach that from the beginning the problem is a turbocharger which is inefficient despite good indications on the computer.

Do you have facebook? I would talk to you about the trolley, maybe we can fix yours and my forklift together ;-)
  • Posted 3 May 2018 06:41
  • Modified 4 May 2018 05:09 by poster
  • Reply by tomason2
  • -, Poland
Boost pressures are within tolerance, although we have noticed that the duty cycle percentage at full rpm is lower than it should be. We have also noticed that the Engine ECU hasn't been flashed for the newer modified turbo mod. We are going to see if we can reflash this, or try another ECU. Engine performance does seem to be wrong I am hoping this might cure it.
  • Posted 19 Apr 2018 15:20
  • Reply by GarySW1
  • Suffolk, United Kingdom
have you tried a different engine ecu?
I think you are correct and its an engine issue.
is the actual and demanded boost pressure roughly the same?
  • Posted 19 Apr 2018 11:38
  • Reply by Lindetech
  • Auckalnd, New Zealand
Check that the brake valves on the hydrostat are not by-passing. this would cause slow drive performance.
  • Posted 19 Apr 2018 00:58
  • Reply by PAtoytech
  • New York, United States
No, engine does not stall. Relief seems to open and the engine continues to run, all be it under load
  • Posted 18 Apr 2018 16:07
  • Reply by GarySW1
  • Suffolk, United Kingdom
Does the engine stall if you lift to full lift and hold it on relief?
  • Posted 18 Apr 2018 14:54
  • Reply by Lindetech
  • Auckalnd, New Zealand
Yes correct, Engine is a bjc. We have tried a new vacuum pump and also replaced the vacuum solenoid. The vacuum hoses are good and holding pressure. You can see the turbo actuator working. Still no difference. All engine data seems to be good. When lifting the hydraulics also seem a little slow to start lifting. It seems to me like an engine power issue. We have even swapped over an injection pump, and also swap over a complete engine. The transmission has been tested at Linde Hydraulics, and also the hydraulic pumps swapped over with another truck. The fault is still there. It is really strange
  • Posted 18 Apr 2018 05:03
  • Reply by GarySW1
  • Suffolk, United Kingdom
The turbo is actuated by vacuum.
I'm assuming you have a BJC engine in it?
The ECU sends the signals to a black vacuum solenoid up by the radiator on the left as you look under the bonnet. Are all the vacuum hoses good? And is the vacuum pump working correctly.
  • Posted 18 Apr 2018 04:53
  • Reply by Lindetech
  • Auckalnd, New Zealand
F Pressure is 24 Bar with engine idling, and 26 Bar when driving.
Y pressures are both the same, 0 Bar at Idle, and 12 Bar when driving with full throttle (top speed is not achieved). 1Y2 and 1Y3 are now showing approx. 800mA when at full travel. This has been improved by adjusting the turbo actuator rod. Previously the mA were at 600 for the direction solenoids. However acceleration and top speed is still very poor. I feel that the ECU is holding back the full 1200mA required to give full drive. However I am unsure why. A new Turbo has been fitted but this has not improved anything.
  • Posted 17 Apr 2018 20:45
  • Reply by GarySW1
  • Suffolk, United Kingdom
What's the f pressure when the machine is on the ground?
Also check your y and z pressures.
Solenoids could be at 1200 ma which is correct but if the f pressure is down it will not drive correctly.
  • Posted 17 Apr 2018 19:25
  • Reply by Lindetech
  • Auckalnd, New Zealand

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