Volvo L90E Transmission slight delay shifting to 2nd

[funwithfuel]

these are the inputs from the gear selector

And these are output to shift solenoids. You should see 24 volts when energized. Coils should show approximately 20-24ohm resistance. Hope this helps. Good luck

 

[Volvomad]

Great stuff . Thanks. That will help loads . Just need to make time now . Any ideas?

 

[funwithfuel]

To make time? ........ Not a clue. Once it's gone, its gone.

 

[Nige]

To make time? ........ Not a clue. Once it's gone, its gone.

The Irish equivalent of "When I get a round tuit"..?

 

[Volvomad]

Between drinking tae in the morning and stout in devening, there aint much time in the middle

 

[Volvomad]

Back at it again. Never got any further since as the machine was going 6 days a week since and has clocked 1600 hundred hours of hard work. The problem remains exactly the same. Pressure for 2nd gear is 10 bar. Every other clutch gets 15. It takes half a second longer for 2nd clutch to enguage than any other. Put a 2nd gauge on forward clutch and it runs at 14 bar in gear 2 and 15 bar in 1 3 4. I swapped coil from gear 4 and put it on valve 2 no change. Swapped complete valve between 2 and 4. No change. The coils are rated for 26 volts but all are running on 14.5. Connected the 24v battery charger to coil on gear 2. No change. If it is a clutch pack seal i would expect some deterioration in pressure or time delay. If it was just time delay i would put it down to clutch taking longer to fill due to wear. My next plan is to remove the valve block and inspect the gaskets supplying the feeds. Then pull out the whole lot if i find nothing but that is no small job. Any more input or suggestions would be great.

 

[funwithfuel]

I would start by removing the stem of shift solenoid SC. Make sure you don't have any damage to the o-rings. Then I would swap that stem with that of SE . So you're switching 2nd with 4th. Also, keep in mind, the loader will almost always start in second gear, unless the load or incline dictate otherwise. Make sure the gear you are feeling is the gear you are in. Verify by observing the instrument panel. You can be preselected in F4 but start out in F2 or F1. If your clutch pressure is low but hasn't gotten worse, I'd say the clutch pack and seal rings are ok. I'd be looking hard at the stems vs the magnets.
I attached a little light reading for the meantime

 

[funwithfuel]

BTW is 2nd gear cluch pressure weak in fwd and reverse?

 

[Volvomad]

Same pressure in both directions and when I powered it on its own via the battery charger when no direction clutch was engaged. I did swap valve stems between 2 and 4 and looked in the valveblock ports and inspected the O rings but no change and nothing obvious a miss. A tear in the gasket would likely deteriorate over time but a pack seal would be even more likely to worsen over time. I will read what you sent on. Thanks. .

 

[Volvomad]

Nice read but nothing jumping out at me as regards my problem. I pulled the 2 layers of the gear selector control valve to find an O ring missing without a trace off 1 of the oil lines going into the valve so I am waiting for parts and crossing my fingers.

 

[Volvomad]

Fitted new gaskets and O rings on pair of steel pipes leading off into transmission. Pressure for 2 is up to 15 bar and delay gone.

 

[Nige]

Glad you got it sorted. Sh1t like that will give you grey hairs.

 

[Volvomad]

Grey and bald went to war on my head a few years ago.

 

[funwithfuel]

Who won?

 

[Volvomad]

Its not over yet but i miss the organic spark protection

 

[funwithfuel]

The baldness won early for me .