Eaton no. 4 query

IIRC, on my 1830B ACCO. Switch down, lift then press throttle on split shift, no clutch. On low split with gear shift, don't pre select. It was an electric
No. 4 two speed. As with any truck gearbag, experiment a bit, after a week or two you will be rolling a smoke, on the phone, on the UHF and not even thinking about shifting gears!

Not sure if this helps or not. Started the bus and tested what happens sitting stationary. I understand this May not perhaps be what happens when changing.

When I left the button for high ratio the solenoid opens and supplies air to the changer and it goes into high range. When I push the button down, the air escapes from the changer and it drops into low range.

This was a little different to what I first thought, in that I thought if it lost air, power etc it would default in to high ratio.

I guess this means the issue may be with the air piston not working properly rather than the spring

Do you have an air Quick release like a maxi brake unit between the solenoid and the Unit to let the air rush out quicker. The Leyland that I had was fitted with one, but the electric unit was still faster. Just a thought - Kav

Hi Kav

I don't have one of those. It seems to dump the air pretty quick and going to low range doesn't seem to be the problem. Changing from low to high is where the delay seems to be.

From all the replies I believe that either unit will do the job if working correctly. I get the feeling that the piston in mine is the issue, perhaps needs a new ring/o-ring. I am not sure what's inside it and I can't find a diagram showing internal components.

The puzzle continues. Maybe a trip to the wreckers to see if I can get an electric one that works and try it. That will settle it I guess. Seems a pity though.

Any other ideas will be gladly received.

Thanks

Ash

You need to pull the unit apart.
Check the diaphram for pin holes.
But it does sound like the unit needs a service.
Disassemble, clean, inspect for wear, replace 'badly' worn bits and reassemble. Fill it with sewing machine oil or 10w.
There isn't much in there but it has to be clean.
Sorry If you have done all that already.


chocs

Hi Chocs

We had a bit of a look at the unit some time ago. It appears to have a piston rather than a diapragm.

I assume it has a ring/set of rings of some sort. Perhaps these may need a touch up??

I really don't know whether to fix this one or look at electric option. Would love the thing to work as quickly as my mates does.

G'day check to make sure it is getting rid of the air on the spring side of the chamber quick enough ( prob just a small hole to the atmosphere)


Jon

Hi Jon

I think the air gets out well enough as the change to low ratio is quick. It is the air in pushing on the piston that seems slow, i.e. chnaging up in ratio.

Cheers

Ash