MF6400 Cab Suspension....again!!

[Steevo]

The valve you can see by the mudguard is for draining moisture from the tanks.
Our tanks didn’t last long enough to build up any condensation!!!

Draining moisture? It looks like a Schrader valve.

 

[Steevo]

As has been said, pull the fuse out now!
The compressor under the cab floor is fragile so won’t last long kicking in every minute or so.
We fitted new plastic tanks and also tried resealing with silicone and also mastic none of which lasted any longer.
We eventually bypassed the tanks and fitted quick release air couplings to the air bags and now just top up with the workshop compressor now and again, normally keeps up for 3 months!! We don’t have air brakes.
Brilliant compared with buggering about fitting new plastic tanks twice a year at £120 each.
The tank is an incredibly stupid design, there is no need for it to be in two halves.

Ah I see, thank you. This makes sense to me now. So there is a compressor, which feeds the two plastic boxes as air holding tanks.

These then feed into the air bags as/when the pressure in the bags drops....or the height valve requires it.

So leaking air tanks won’t cause the cab suspension to drop onto the bump stops quite yet...I had expected it would be on the stops within an hour or so.

I shall investigate re-sealing, but price up buying an air tank from Jacksons, and investigate springs too.

The sooner I can get it fixed the better as like most the tractor is busiest this time of year.

 

[bill and bens dad]

we bought a new compressor from marcle leisure 01531 660797,a lot less money than mf,it works fine needed slight alteration to fit,hope this helps

 

[Rust]

Glue or sealant suggestions please [emoji2]

 

[General-Lee]

Glue or sealant suggestions please [emoji2] View attachment 715894

Pritt-stick.

 

[Steevo]

Just typical! Phoned Jacksons for a price etc. Did all my research.

Went to check the tractor and pull fuse out. Was it leaking?! No!

Just done 30ac of spraying with it and still not a problem. Compressor pumped up just fine when started and can’t hear a leak.

 

[Steevo]

Just typical! Phoned Jacksons for a price etc. Did all my research.

Went to check the tractor and pull fuse out. Was it leaking?! No!

Just done 30ac of spraying with it and still not a problem. Compressor pumped up just fine when started and can’t hear a leak.

Well that did the trick! 2 mins after posting the compressor kicked in. Leak now evident!

 

[jthomsonagri]

Well that did the trick! 2 mins after posting the compressor kicked in. Leak now evident!

Are you sure it's the plastic tanks leaking?I've had pipes crack in the compressor box but still sound like the air is leaking from elsewhere.

 

[Steevo]

Are you sure it's the plastic tanks leaking?I've had pipes crack in the compressor box but still sound like the air is leaking from elsewhere.

Can’t be 100% sure but will get it checked by mechanic tomorrow.

 

[Steevo]

Just been into the fuse box to pull the fuse.

Turns out someone has been here before. What should be a 50A fuse has been swapped for a 20A!

Sure I read somewhere else when digging through the thread yesterday that someone recommended downgrading the fuse so the compressor is less likely to burn out.

Fuse now pulled.

 

[Dman2]

Take the compressor off
Sell the compressor
Use the money to buy the coilovers that replace the shock absorbers

No more problems

 

[rob h]

We only got our tractor last year and the compressor wasnt running .After checking fuses found the wiring had been pulled off the back of the switch. Which saved the compressor. I found the leaks with a laundry spray filled with soapy water .sprayed all over to find both tanks leaking .

 

[Rust]

Take boxes off and re seal that’ll be cheapest and effective

What do you re seal with @jack6480 ?

 

[Keepin! It real]

Fuse was changed from 50amp to 20 amp as per mf bulletin either at pdi or at service . Have replaced shocks on 2x mf 7480's with ones off mf5480 been on about 6weeks been no problems so far .saved 2 compressors and 4 tanks!also there is a common union in box which can leak air the one what screws into brass solenoid then goes via a pipe to relief valve

 

[ffukedfarmer]

Fuse was changed from 50amp to 20 amp as per mf bulletin either at pdi or at service . Have replaced shocks on 2x mf 7480's with ones off mf5480 been on about 6weeks been no problems so far .saved 2 compressors and 4 tanks!also there is a common union in box which can leak air the one what screws into brass solenoid then goes via a pipe to relief valve

What is the ride like where springs have been fitted in place of the shocks?

 

[Farmer_Joe]

I just used std clear silicone, fit seal then silicone other side stick together tighten up

 

[Keepin! It real]

The ride is no different according to customer ,it did sit up a bit higher to
Start with but it's settled down .about the same ride height as normal

 

[Lofty1984]

Has anyone converted theirs to run off the air brakes ? If so how did you do it

 

[davidroberts30]

Has anyone converted theirs to run off the air brakes ? If so how did you do it

Easy
Ring erentek and get a adjustable pressure regulator and 4bar safety valve for about £70 and some 6mm pipe
Connect the valve to a airline somewhere then to the adjustable reg then t that to the 2 airchambers doing away with the box under the cab completely

 

[Lofty1984]

Can you not just bypass the compressor and let it run through the existing regulator valves ?