We have a Linde H25T 393 Series Truck that will not achieve top speed and comes to stop at 70% or Greater Throttle.

No Error Codes
LHC was been reprogrammed and swapped with a known good unit.
Hydrostat has been replaced.
brake valve has been replaced and the 1 drive motor has been replaced.
hydraulic control valve has also been replaced.
Engine ECU Was also replaced.
Pressure checks out. Local Dealer is clueless.
Parts Not Replaced: Right Drive Motor, Accelerator Pot (accel pot has been calibrated)

The only thing we have seen is when the fwd or rev solenoid is activated our top voltage is ~6.5 and will drop off at full throttle.

Please Help!

what voltage does the LHC normally put out to the solenoids and how can we trouble shoot this

howitt937 at gmail dot com