I have a cub cadet 1450 hydro and it goes forward and lifts just fine.But when I try to go in reverse sometimes it does not mover or it will move very slow

If your 1986 Cub Cadet Hydro 1210 is experiencing difficulty moving forward but works fine in reverse even after changing the transmission filter and fluid, there could be a few potential reasons for this issue. Here are some steps you can take to troubleshoot the problem:
1. **Check Drive Belt:** The drive belt is responsible for transferring power from the engine to the transmission. A worn or damaged drive belt can affect forward movement. Inspect the drive belt for any signs of wear, fraying, or damage. If the belt is in poor condition, consider replacing it.
2. **Check Tension of Drive Belt:** Ensure that the drive belt is properly tensioned. A loose drive belt can lead to slipping and difficulty in forward movement. Adjust the tension according to the manufacturer's specifications.
3. **Inspect Linkage and Connections:** Examine the linkage and connections between the control lever, transmission, and the drive system. Loose or misaligned linkage can result in improper engagement of gears, affecting forward movement.
4. **Hydrostatic Transmission Issues:** Since your Cub Cadet Hydro 1210 uses a hydrostatic transmission, there could be issues with the hydrostatic unit itself. Check for any signs of leaks, damaged hoses, or worn components in the hydrostatic transmission system.
5. **Transmission Oil Level and Quality:** Ensure that the transmission oil level is correct and that you're using the recommended type of oil. Poor-quality or incorrect transmission oil can lead to performance issues.
6. **Air in the Hydraulic System:** If there's air trapped in the hydraulic system, it can cause issues with the hydrostatic transmission. Bleed the hydraulic system to remove any air bubbles.
7. **Transmission Pulley and Sheaves:** Check the transmission pulley and sheaves for wear or damage. If these components are not functioning properly, they can affect the movement of the drive belt.
8. **Check for Obstructions:** Inspect the underside of the mower deck and the drive system for any debris, obstructions, or objects that might be interfering with the forward movement.
9. **Professional Inspection:** If none of the above steps resolve the issue, it might be a more complex problem requiring the expertise of a professional technician. They can perform a more in-depth diagnosis of the hydrostatic transmission system and identify any underlying issues.
Keep in mind that working with mechanical and hydraulic systems requires knowledge and expertise. If you're not comfortable performing these checks and repairs yourself, it's recommended to consult a qualified technician who has experience with Cub Cadet or similar equipment.

This actually sounds like the top pulley on the transmission may be loose and the center hole worn out.

Depending on the actual sound though it may be a bad transmission - sorry. I suggest having a dealer mechanic inspect it.

tranny needs rebuild

May be low on hydraulic Oil.
Theres also a nut that releases the hydro pressure make sure it is not loose. Make sure there are no leaks. And make sure on the back of the mover that the hydro release is not pulled. If there are no issues then there is a issue with the hydro pump and yes the repair is costly. A replacement pump is roughly $250-300 dollars.

I’m happy to assist further over the phone at https://www.6ya.com/expert/christopher_722ea729aae6fd07

could be bad hydro pump bad check valve low on fluid or dirty fluid try changing the fluid and filter first

can only guess

Low on cub cadet hydro fluid?
other hydro filter other and cub cadet?
linkage came unhooked from drive mechanism
your engage disengage lever at the back of the mower is set so it can be pushed,engage lever to allow hydro pump not to be bypassed

Have you check the fluid leval in it at all, It could be right down if you never check it ,End everry thing in it siezed up.

did you check to see if your belt was in good shape and if the hydro relef was in

You will have air in the system and will need purged. To do that you jack up the wheels to where they will turn freely then disengage the hydro and at an idle alternate forward and reverse for a for about 4 or 5 minutes. Recheck the fluid level and top off. Now engage the hydro and do the same forward and reverse for 3 or 4 minutes. You should have axle movement at this point. Hope this will help.

2 valves on top of trans under finders