D8K 77V9823 transmission harsh shifting

Also another problem, transmission oil is transferring to the engine.

The transmission pump has been done up which has slowed it down a lot but is there anywhere else it could be getting into the engine?

Is the most likely scenario it’s still leaking from the pump?

The problem with trans oil getting into the engine oil is the seal on the transmission/steering clutch pump may be installed wrong or got damaged.

The problem with trans oil getting into the engine oil is the seal on the transmission/steering clutch pump may be installed wrong or got damaged.

On the rough shifting, yes there is a modulating relief valve that controls that.
Could be valve setting is not correct.
Adjustment of control linkage not correct.
Load piston or differential and safety valve not moving
Valve springs that are weak or damaged.

Transmission oil in the engine would pretty much have to come in past the rear crankshaft seal.
Oil leakage from the transmission pump seal would dump into the flywheel/torque divider housing.
Too much oil in the flywheel/torque divider housing could be due to:
Bad scavenge pump
Plugged inlet screen for the scavenge pump
Excessive leakage inside the torque converter.

[quote="Old Magnet"]On the rough shifting, yes there is a modulating relief valve that controls that.
Could be valve setting is not correct.
Adjustment of control linkage not correct.
Load piston or differential and safety valve not moving
Valve springs that are weak or damaged.

Transmission oil in the engine would pretty much have to come in past the rear crankshaft seal.
Oil leakage from the transmission pump seal would dump into the flywheel/torque divider housing.
Too much oil in the flywheel/torque divider housing could be due to:
Bad scavenge pump
Plugged inlet screen for the scavenge pump
Excessive leakage inside the torque converter.[/quote]

Thanks for all that

I thought the pump drive on these was lubricated via the engine oil system and was separated from the flywheel/torque divider housing?

All the valving you speak of is in the transmission control valve I’d imagine?

[quote="Nick22australia"]Thanks for all that

I thought the pump drive on these was lubricated via the engine oil system and was separated from the flywheel/torque divider housing?

All the valving you speak of is in the transmission control valve I’d imagine?[/quote]

You are correct (my bad), the transmission pump is driven off the engine power take off which is separate from the flywheel/torque divider housing so pump leakage could wind up in the engine sump.

Yes, valving mentioned is part of the transmission control.

Not sure how you fitted a speedi-sleeve to the pump shaft as the diameter becomes too big to go through the white metal bearing.
The seal needs to be fitted with the lip facing out as there is suction behind the seal which makes it seal on the shaft.
It does take much groove wear on the shaft to make them leak.
If the t/c hsg is becoming flooded to the extent of oil passing through the engine rear seal ( large steel piston ring ) then I would imagine you would be having trans over heating issues also as the t/c would be "thrashing " at lot more oil than usual.

Might pay to check P1,P2 and the initial pressures also. I came across a bad modulating valve on a D9H once. Swapped it with one from a D8k ( same valve ) and all was good.

Good Luck

Cheers djcat.

Not sure how you fitted a speedi-sleeve to the pump shaft as the diameter becomes too big to go through the white metal bearing.
The seal needs to be fitted with the lip facing out as there is suction behind the seal which makes it seal on the shaft.
It does take much groove wear on the shaft to make them leak.
If the t/c hsg is becoming flooded to the extent of oil passing through the engine rear seal ( large steel piston ring ) then I would imagine you would be having trans over heating issues also as the t/c would be "thrashing " at lot more oil than usual.

Might pay to check P1,P2 and the initial pressures also. I came across a bad modulating valve on a D9H once. Swapped it with one from a D8k ( same valve ) and all was good.

Good Luck

Cheers djcat.

Are you actually seeing a drop in the transmission oil level? On the other side of the transmission pump drive would be the hydraulic pump for a dozer blade, ripper etc. That could also be a source of fluid getting into the engine.
As for the speedy-sleeve it would need to be installed from the splined shaft end of an assembled pump. I don't see any problem with doing that until it's time to disassemble.