1845c loses drive after shutting off

So you are losing drive on both the left and right side.
If so, then it's unlikely a linkage problem as a loose linkage would affect only one side or one side more than the other.
Stuck brake pins (which are common) would again most likely affect only one side, not both at the same time.

If it's affecting both side equally, then that points more to the coupler (which looks good) or the charge pump??? Partially stripped shaft.
The 1845c is all mechanical, no electronics or safety lock, so it's something physically broken/wrong.

for the leaking drive spool seals:
https://www.heavyequipmentforums.com/threads/1845c-drive-spool-seals.74713/
https://www.heavyequipmentforums.com/threads/case-1845c-leaking-on-top-of-tandem-pump.73640/

phil314 said:

So you are losing drive on both the left and right side.
If so, then it's unlikely a linkage problem as a loose linkage would affect only one side or one side more than the other.
Stuck brake pins (which are common) would again most likely affect only one side, not both at the same time.

If it's affecting both side equally, then that points more to the coupler (which looks good) or the charge pump??? Partially stripped shaft.
The 1845c is all mechanical, no electronics or safety lock, so it's something physically broken/wrong.

for the leaking drive spool seals:
https://www.heavyequipmentforums.com/threads/1845c-drive-spool-seals.74713/
https://www.heavyequipmentforums.com/threads/case-1845c-leaking-on-top-of-tandem-pump.73640/

Click to expand...

Watched that video and subscribed!! Thank you for sharing, can't wait to fix that leak.

The loss of drive is on both sides. It goes from 100% to nothing, both control sticks can be moved and nothing happens at all. Brake pins both release, coupler spinning (as seen). I am unaware what the charge pump is, but I'll look into that.
It never loses drive in the middle of using it, it only happens when I stop and shut down, then restart and have no drive.

I've learned a lot from this post already, no electronics so it has to be something in the hydraulics. Starting to narrow it down some.

Back in the office again and reread the posts glad you got it back to the shop. Something could be stripped in the pumps or fluid not getting to the charge pump . Heres some pressure checks
View attachment 231967

HATCHEQUIP said:

View attachment 231972 View attachment 231973 Back in the office again and reread the posts glad you got it back to the shop. Something could be stripped in the pumps or fluid not getting to the charge pump . Heres some pressure checks
View attachment 231967

Click to expand...

I can't thank you enough! I need to get a service manual like that. I will also have to get the proper gauges so I can service this properly. Once I have readings I'll post back, and hopefully eventually follow up with a solution.

Update:

Charge pressure dropped right off, the new hydraulic filter was cut apart and metal shavings have been found.

Looks like it'll need the tandem pump replaced. I'd like to replace the pump myself, but without a filter cart and a proper flush I'm wondering if it's better to have my local case dealer to handle it.

Anyone have input on those who have done it themselves?

In addition to pumps and flush, drive motors need overhauled too.
Last on I did was $5500 for tandem pump and both drive motors, but that was 8 years ago.
Flushing was a PITA.

A diy flush system can be made fairly cheaply but in my opinion you need to take every hose off first, run a pig through them, clean the hydraulic tank, and pray that nothing got into the valves or other pumps. But I've seen guys only flush and keep going without issues but the machine was also on it's last legs and whatever time they got out of it was extra.

I think it's in my best interest to have the dealer do a flush and they said they'd inspect drive motors before proceeding as well.

Appreciate the input! Now it's just a matter of finding a reman tandem drive pump, case dealer can't find one in Canada. Hopefully I have some luck state side.

Would have liked to see pictures of "medal shavings" in your filter. It seem odd to me that your machine would have full function then no go then back to full function with a catastrophic failure. I would start by pulling the charge relief valve and insect for scares or trash. Seems you don't have much to loose even going farther into pump at this point.

63 caveman said:

Would have liked to see pictures of "medal shavings" in your filter. It seem odd to me that your machine would have full function then no go then back to full function with a catastrophic failure. I would start by pulling the charge relief valve and insect for scares or trash. Seems you don't have much to loose even going farther into pump at this point.

Click to expand...

I thought it was strange too. I'll cut apart the old filter I kept before this last one that was cut (at case). I might go pick up the machine and pull the pump myself. I did try check all 4 of the side plugs where the valves are and nothing looked out of ordinary/no shavings. But maybe I can dig deeper into the charge pump.

I'm a hydraulic noob keep in mind. Wish my problem was in the engine, so much easier for me to rebuild that.