What type of oil is used for hydrostatic transmission on cub cadet 42 sd

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.

Your owners manual would be of great help. Check this site for one.

https://www.manualslib.com/products/Cub-Cadet-7235-4222734.html

If it is a old mower it is probably is the transmission I found a used one on Craigslist in my area.

2014 - Cub Cadet LTX 1046 KW - 21.5 HP Kawasaki 46 ...

www.georgiamower.com/cub-cadet-ltx-1046kw-2014
The Cub Cadet LTX 1046KW Series Lawn Tractor is one of the most innovative and ... pdf, 2013 Cub Cadet LTX1046KW, LTX1050, LTX1050KW Owners Manual ... 2012 - Husqvarna YTH22V42 - 42 Inch Hydrostatic Riding Lawn Mower.

the hydrostatic transmission is sealed at the factory it is maintenance free.take it to a cub cadet service for rear end noise http://www.cubcadet.com/wcsstore/CubCadetCatalogAssetStore/Attachment/owners%20manuals/residential/GT1554_769-03404.pdf

In most cases the hydrostatic drives are not made by the company tractor or lawnmower.
This is in the owners manual.

Hydrostatic Transmission
The hydrostatic transmission is sealed at the factory
and is maintenance free. The fluid level cannot be
checked nor can the oil be changed. Always keep the
area around the transmission cooling fan free of grass
and debris at all times

Cub Cadet LT1024 Operator Manual

How to Change the Hydrostatic Fluid in Cub Cadet Lawn Mower

https://www.google.com/webhp?sourceid=chrome-instant&rlz=1C1GGGE_enUS385US385&ion=1&espv=2&ie=UTF-8#q=cub%20cadet%20hydrostatic%20fluid%20change

I hope that this can help. Tom

Try looking at the directional lever at the Transmission. The PTO for the deck will shut off when shifting into reverse. You may have to simply disconnect or jumper the reverse switch depending on if it is normally closed or normally open. Try it both ways to see what works. Also check the engine oil level, The low oil level switch will shut the engine down if more than a quart low.

check the hyro oil level is up to the correct mark. but some hydro units make a noise if you set off on full revs quite rapidly

This is a well documented problem with cub cadet ZT transmissions. They tend to go bad after 200 hours of use. Sometimes having the dealer change the transmission oil will help (they need to remove the transmissions to do this!). Most times, the transmission is gone & must be replaced ($800-$900).

Sound to me like a design defect. My ZT-50 lasted only 4 years. Needless to say, the replacement was not a cub cadet.

Hi, Cissy, Every Cub Cadet is different, and they keep their manuals to themselves. With your exact model and serial number, you can go to their website and view the manual for your model which should have the type of oil you need. Their website is www.cubcadet.com and go to service. If you have trouble, let me know, but I will need the model and serial. Good Luck, this should Fixya!