Home Forums General Discussion Technical Questions TAC-32 Low Oil problem

I HAVE A tac-32 that is consistantly throwing a low oil fault. We recently replaced internal and external packings for the 3 stage jacks. There are no leaks from the pistons, and are holding good pressure. We also replaced the UL adjustor O-rings as they were leaking. Car runs with no problems.

Every night after the jack re-sync, The pistons will come back up to hit the platon plates, but car will not re-level, and throws a 1043-Low Oil Fault. I can put it on inspection, go in on the UL adjustor about a half turn, and run the car up. After which, car will level in, perform another re-sync and go into regular service. Will run fine, through all FJR commands and runs until the next timed re-sync. UL adjustor is not working itself out.

How does the UL adjuster screen look?

has been clean, no debris in it that I've noticed

There’s another screen under the up metering block that should be cleaned. When both are clean, reset low pressure with cold oil and see if it still does it.

Try like an small 1/8 turn in on the up slowdown.

Agree with low oil Adjust up slow down, also what are your leveling speeds?
Jack resync will probably be happening when your oil is cold,

Try cat oil directly on the pistons, I've also used, old school Jack slime

Turn in leveling. It ll run it up.

the buffer in pit may be too tall

when the car re-sync's it comes down and sits on buffer for a given amount of time
that time allows the pistons to bottom out and "re-sync"
on the way up and also down, there are monitors for these pistons that must not let one hand piston get a certain distance from the other side
they might be magnets connected to piston head passing by a box with a prox switch in it
these inputs to the controller can be watched on any device that runs that software, they may also be led's on the main board
i mentioned buffer because:
if the buffer does not allow enough travel at bottom, and time to sync, they will not sync properly
normally a power off/on reset gets a customer thru it as they can see the car sitting just below the floor
the springs will probly be an inch or so above the tubes that hold them
remove the springs and you'll achieve more travel at re-sync time
i ended up band-sawing about 1.5" off springs on a couple of telescopic dmc's, never happened again
put cut end down into holding tube
(make sure, of course, that the extra travel does not create any obstruction issues)

on a few tac 32's i have replaced check valves to solve it
if you have check valve issues due to pieces of failed packing getting into the check valves at bottom of pistons and not allowing them to open/close properly, that's your trouble
the check valves are an integral part of the telescopic process
not unusual to have low oil scenarios and cars shutting down in that case especially a few years after install of original packing