And when you try to tear it down to rebuild it, the screws are corroded and sometimes break off in the housing. As with all regulators, bleeding does help prolong the life of the regulator but won't make them last forever.

ricky- you can drain those regulators til the cows come home & still have baked in residue from low quality LP- not to mention caked up sticking injectors.

RE: fuel grade, if you drain the regulator at each service you greatly reduce fuel component failure and costly un-needed repairs. Most techs use the "swap and try" method of troubleshooting or the"needs a tune up" method.

just replace the mini lever on the function that is not returning to zero. You can try removing the black rubber lever and cleaning under it. If in a dirty environment, it could stick. There is nothing wrong with the VSM

These trucks are an electronic nightmare. You may want to consider getting this truck running, with no codes, & then replacing it with an older model (pre- electronics). I service two of these with 5500 hours on them & they're always requiring some sort of sensor, fuel injector, fuel regulator- the list goes on & on.

If you decide to keep it, make sure you use HD-5 propane (assuming it's a LPG truck)- the lessor grade propane will cost you dearly in regulators & fuel injectors.

Thanks for all inputs. We have sent the card off to be repaired. hoping to save a little money. All info was helpful. What I finely found was the Can lo wire low ohms to ground. Wires tested fine when plug was removed from card. Could test terminals on card and read the Can lo terminal less than one ohm to ground......edited by Admin......
Thanks again to All.

Have you tried sitting in the seat ,key on and when you get the message on the display flick the mini levers to see if you can clear the interlock. But looking at what you have said I reckon your MLM needs replaced as uif little control board is faulty.it's not available on It's own.gotta buy the whole thing but once you've done it the newer version's are a lot more reliable

Still plugging away on this old problem.
It took some time, but i've got into the service password. Have found that the armrest switch is not switching from open to closed when the armrest is lowered and locked.
The two wires that go into the MLM card from the armrest switch are 501 and 122. with the switch open, wire 501 has 5 volts when the magnet is placed next to the switch, the switch closes and the 5 volts goes to 0 volts, but the display does not indicate this. I still think this can be a CAN bus issue.
Also can not determine the exact location of the termination resistors CRP49 and CRP78.

the mini levers have to be 0%
in the rest position
to prevent hydraulic lock
I would like to ask a question
someone may have changed the configuration
the display
have changed configuration three mini levers
to joestick
Please check this

hello friend
you have access to the display?
the original password is 55555
you should have no problem in some mini lever
the mini levers should be 0% and rest
the display is to verify the percentage of work
already had this problem was one of the mini lever
if you have any problem with the message will appear on the display
HYDRAULIC INTERLOCK RETURN TO NEUTRAL
can add me on skype
My skype: hyster.brasil

service password of factory is 55555 or serie nr. 0=1 above 5=5 some customer0=5

I kind of agree with you liftman about the module, but I would still like to know the out puts for the hi (wire 901) and lo side (wire 900) and how those two wires along with supply and ground represent three levers before i spend the $1200 to get this module. And how sweet it wuld be to have the service password.

If you are getting Hydraulic lockout, static return to neutral, you have a bad mini-lever module. Hyster had a serious issue with these some time back. There was a group of trucks that had an extended warranty for the mini-lever module. Hyster had so much trouble, they recommended changing the whole assembly. You can check the serial number with the dealer to find out about warranty. If not, hold on tight to the wallet. Those modules are not cheap. Mini-levers are the cause of the fault.

finely got some time to spend with this Hyster which has hydraulics locked out. Im learning the system as I go and I dont have the service PASSWORD which would make this alot easier. One of the other mechanics told me that the hydraulic functions may come back from time to time when they had to move the unit. Anyhow tested the seat switch and I have a good sensor output signal volts @5vdc to the VSM pin 11 CRP9, also ground circuit is good.
Armrest switch circuit to the MLM is also seems to be ok. But there is No varied signal from the MLM Lt Green 900 and yellow 901 wires. The mini lever do seem to function correctly with voltage going hi and lo with lever movement. also all three are the same.
What do you think, do i have a bad MLM card? What should its outputs be? power to the MLM wire 203 is 12vdc.
Appreciate any help,
I am wandering if this new proprietary technology is going to drive me out of business at least the honest way of doing business.The nearest Hyster dealer is 75 miles away, I cant sell these machines around here and expect customers to pay the cost of the travel. Knowing these types of issues and I can't get the software legally.
Thanks everyone.

check the 0 position off the minilevers in diagnostic menu interchang the lever with other positions check the follow