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Trying to find out all problems in my 716 ...
The 4WD locks without problems as soon as I flip the switch, but is very "lazy" in unlocking. The only way to get a quick unlock is taking a sharp turn (city cornering e.g.).
What should I check?
Tightness of lock vacuum pipes?
Old grease in locking mechanism?

Thanks,
Ugo

Hello Ugo
There can be many problems.

First :
check your plastic-tubes to the Diff-Look Box. I have often problems with old and destroyed heat-absorber-Plates over the central-tube.If it is brocken or damages, the heat of the exhaustsystem smelt the Plasic-tubes to the Look-Box , the air can´t get quick through.

Second:
Pull off the Diff-LookBox, it is fixed with two 6mm Screws. Take apart the upper cover , two more 6mm screws.Put it carefully off, without damaging the rupper-diaphragm ! There are no spare parts available for parts inside this Box! Only complett box.
Take apart the outside rupper gasget- it is fixed at the center-pin with a Plastic-ring. If this parts are damages, it can be orderd in factory.
Now pull of the rubber-diaphragm with his metall-pin.Check if the under-case and the metall-pin is corrosided and if it is "under oil" . Remove any oxid coat and befor connecting all parts ,grease them at all movement places. Check also the under-case , if it is oxided at the monting surface-here is a weak point -the case is near the tube outlet very small and it bend to leak.Check at both aluminium cover ,if the metall tubes are real fix mount( i have some break off) . At the upper cover is the main problem the carry out of the signal-cabel. There are two versions: first version breakthrough to the central rivet, second version a T-Tube is mount as breakthrough for the signalcabel and conecting tube for Unlooking . At both version are problems with sealing.Here, i think , you will have the problem.Seal it seperatly with liquid sealings.

Third :
check your four-wheel-drive valve if it workes corectly and it is seal?
The valve´s are under the middel dashbord cover . Also check if the Difflook filter and dryer is okay-they are under the glove compartment fixed at the frontwall.If you take apart the middle cover ,you shut clean in this way all tubes with pressured air.Sign all lines , remove all boxes and valves befor this.

If all this is without any success, you have to take apart the transmission.
If any Questions ,call me

Thank you very much for the very complete explaination and hints.
It is clear that you have quite a deep experience in the TD Pinz - I wish I could live near your garage! Unfortunately, this is not the case.

I am now leaving for summer holydays. I will be back in one month and resume working on the Pinz.

Regards,
Ugo

I am now leaving for summer holydays. I will be back in one month and resume working on the Pinz.

Ugo, Ugo, I thought a Pinzgauer enthusiast such as yourself would spend his "summer holiday's" working on the Pinzgauer
..... what more pleasurable way could you spend all that time!

Whats the default setting with the locks and all wheel drive selectors?

i.e. if you have insufficient vacuum do they engage or not engage?

My pinz is acting like the hanbrake is on, but isn't.

I think the locks are on, or perhaps just the front one as it lets go and then re-engages

No vacuum = 4x4 engaged, front/rear difflocks disengaged.

Regards,
Ugo

I need to check, but I'm sure it requires vacuum for both the 4x4 and the lockers to engage. The pneumatic/electric switches are: no power to engage the 4x4 ( hence engaging the 4x4 when engine is off and parked). Power engages the lockers. There is an innerconnect between the lockers. Rear locker must be engaged before the front will. Front locker will disengage if the rear locker is turned off. Also, 4x4 is automatically selected if low range is engaged.
Pg 16 to p 34 here.
http://f1.grp.yahoofs.com/v1/UHgZS_R7DX ... Manual.pdf

It really is a very simple and well thought out system... and the innerconnects keeps a driver from doing the wrong thing, and breaking something.
With that said, I did disable the 4x4 mode in low range so I could load it on a trailer.

yay i can log back in

Well had 4wd disengage on Saturday,

Whilst I was in the mud

I got towed out by a Pajero

I think I need to go through the whole check list

Well Mike,
Was it the 4x4 or the lockers? Still, the 4x4 operate with an open circuit, a bad power or ground wire wouldn't be a problem, but if it were the lockers, it could be.
On the 4x4 disconnection, first check under the truck, and make sure you didn'r pull a vacuum line loose ( on the lockers too).
I have a couple of other ideas where you may need to check, but I want to check the diagram of the innerconnects first.

G'Day Dave

yep 4x4. I need to go through the whole checklist (I should have done it last weekend but decided to go for a play)

I need to check the dash switches are plugged in correctly i.e. correct plug to correct switch then start on the checklist.

Also check that the vacuum filter under the dash is not clogged. Check that you have no leaks in vacuum pipes at the 3 plenums under passenger side floor.
Check actual locks operation not trusting on telltales only (I had a bad contact in 4x4 lock, and telltale was always on even when 4x4 was not engaged).
You may wish to follow the manual check procedure step-by-step.

Good luck,
Ugo

G'Day Ugo

yep looks like Christmas weekend will be crawling over the pneumatics.

Hopefully on Sunday I can play in the mud.

G'Day Dave

yeah I think I lost the lot.

I will be studying the checklist for the rest of the week. I have to check the plugs are plugged into the correct switch also as were reinstalled by one of the guys. One of those things I typically like to photograph before being pulled out

as always joy, joy as if had nothing to do it would be boring...... however not having 4wd, in a 4wd is a nuisance

Hey Mike,
I was just reviewing the pneumatic and electric diagrams of the 4x4 and locker system.... a thing of beauty, simplicity, and logic
An open electrical circuit puts you into 4x4, and a closed circuit takes you out of 4x, and disconnects the vacuum to the front lockers ( never want 4x2 and both lockers).
The rear locker engages with a closed circuit whether in 4x2, or 4x4. But, a mirco switch at the rear control cylinder opens if the rear locker is off, disabling the front locker electrically .
Electric wise, all the relays and rockers switches are the same, only power is from pin 5 on the 4x4, and pin 3 on the lockers .

So, check to see if you have at least rear lockers.

Cheers