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#27885 - 09/25/19 12:28 AM Bucher valve  
Joined: Mar 2016
Posts: 191
lowoil Offline
Elevator guy
lowoil  Offline
Elevator guy

Joined: Mar 2016
Posts: 191
Wisconsin
Anybody have problems with losing zero point on these for tac32 mrlh?

#27887 - 09/25/19 11:22 PM Re: Bucher valve [Re: lowoil]  
Joined: May 2015
Posts: 71
TC7 Offline
journeyman
TC7  Offline
journeyman

Joined: May 2015
Posts: 71
Yes, it can be a problem sometimes. Try to get the zero point as close to zero as possible, ideally under 30 millivolts. For reoccurring problems, it may be necessary to replace null sensor, PN #9865901. It is usually necessary to land the car on pipe stands and depressurize system, loosen vic, and shift muffler over to get clearance to be able to slide null sensor off of valve stem to swap part.

It is also worth noting that there is an up and down pilot filter screen in valve block, located under large hex head bolt heads. You can remove these to clean them when the system is depressurized. But do them , ONE AT A TIME as they are very easy to reinstall backwards because they look so similar, (example accidentally putting up screen in down side)

#27888 - 09/26/19 12:42 AM Re: Bucher valve [Re: lowoil]  
Joined: Mar 2016
Posts: 191
lowoil Offline
Elevator guy
lowoil  Offline
Elevator guy

Joined: Mar 2016
Posts: 191
Wisconsin
Ive been there and done that,even replaced valve 3mo. ago,del con board, power supply.

#27889 - 09/26/19 01:27 AM Re: Bucher valve [Re: lowoil]  
Joined: May 2015
Posts: 71
TC7 Offline
journeyman
TC7  Offline
journeyman

Joined: May 2015
Posts: 71
I haven't been in the situation where the issue can't be resolved. I noticed that the proximity of your hex wrench to the null sensor even effect the reading. I'm curious is this unit one of the earlier ones where you had to add the suppressors around the valve coils?


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