Deck lift problems - 782

[TN_Explorer]

I have recently begun experiencing issues with my 782 -- when I start it cold, reverse is very sluggish, goes away after it has run a couple of minutes. The deck was also acting sluggish, now does not want to move up or down. The dipstick reads full when the engine is off, less when it is running. I got some HyTran and topped it up while running. This had no effect. I disconnected the deck and played with the lift lever, got it to move and then hooked the deck back on & it worked long enough to mow the lawn. When I finished mowing (about an hour), the deck lift once again doesn't work.

From what I read, my first order of business will be to get a filter and replace the oil. I'll be doing that later this week.

I suspect this won't solve the problem, as the transmission works. When I engage the lift, I can hear it load up, but nothing happens.

I did try to find some info through a search of these forums, but haven't found anything so far.

I'd be eager to hear from some of you folks as to what I need to be looking for.

Thanks,
Mike

[riesedesperado6170]

well i can't say for sure but i think it the filter. if getting plug and starving the hydro i think it fluid goes to drive side first then split to discharge side which is your lift so it move but not pick. if that don't work check the check valves next.

[J-Mech]

Do a fluid and filter change. Then come back and let us know. I think it will fix your problem. They hydrostat recirculates the oil it uses to drive. The charge pump only supplies whatever disappears through normal internal leakage. So, a plugged filter will not affect drive, as much as the lift.

[Cub Cadet 123]

Originally Posted by riesedesperado6170

well i can't say for sure but i think it the filter. if getting plug and starving the hydro i think it fluid goes to drive side first then split to discharge side which is your lift so it move but not pick. if that don't work check the check valves next.

I had some of the same problems with my 782, but I had no reverse whatsoever. My problem was an easily identified problem--check valves were shot. I replaced them and fixed my problem, but as the others have already mentioned, start with the filter first and then progress to the check valves second if needed.

Cub Cadet 123

[R Bedell]

So, a plugged filter will not affect drive, as much as the lift.

The Hydro Filter ........filters ALL oil and circuits within the Sundstrand unit.

[TN_Explorer]

Thanks - You have given me hope. I am off Friday and will plan a filter and fluid change then.

[J-Mech]

Originally Posted by R Bedell

The Hydro Filter ........filters ALL oil and circuits within the Sundstrand unit.

This is pulled from the Sunstrand manual...

Hydrostat fluid flow.jpg

As you can see, the blue circuit is where the oil returns from the motor. It bypasses the tank, filter, charge pump and goes directly back to the main pump. The charge pump adds fluid to this circuit to account for normal fluid loss.

This system only filters the oil BEFORE the charge pump.

[TN_Explorer]

I replaced the filter and it seems as though the deck lift is working like it should. Thanks for the tip! I would never have thought the filter would have made such a difference.