Hi Swoop do you have a procedure for adjusting/checking the pedal sensor?

Recalibrate tilt angle sensor

doubt its anything to do with the ring gear

since he ruled out the speed sensor i would be checking the pressures from the pump since these units are mostly hydrostatic drive type systems

also check the linkage on the accelerator and the accelerator pot.
If correctly adjusted you should get these readings:
- Pedal full travel in forwards direction: 4.1V
- Pedal full travel in backwards direction: 0.9V

now depending on the model and year some of these units ran at only one engine rpm when drive is activated or the hydraulic levers were pulled if i remember correctly.
I would check the pedal position sensor and also the accelerator solenoid actuator.
Got a full model number to go with that serial number?

Its possible the swash plate has been reset to a slower speed, need a lap top to check.

Missing/worn teeth can cause a miss count on the speed sensor which causes the engine to run at one speed

we have changed and adjusted the speed sensor. what would I look for on the ring gear?

Check the engine speed sensor and ring gear.

check the turbo

Hi

Did u sort this as I'm having same problem.bought one as non runner. Got it running but won't Rev when call for hydraulics

vw diesel lift turbo charged

this is LPG powered truck?
VW engine?
or diesel?

ser# H2X394T00245

This is all I have hope it helps.
Thanks,

going to need more than just that generic model number
need the whole model number and whole serial number to get accurate info so we can help you.

Newer models usually have an 02 or 03 , some digits after the H50D part

and the serial contains the series number we'll need