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There is not a kit as such, but all the internal component pieces are available as repair parts. If you can give me your complete model and serial (not the RZT50 on the side, but the numbers from the model plate), I can provide a parts list for you.
Here's the parts list. You'll find all the internal components listed on pages 12-15.
However, before you do any repairs, since you've already checked the belt, be sure to go through the purging process to eliminate the possibility of air in the system causing the power loss. Here's the procedure for that.
Due to the effects air has on efficiency in hy-drostatic drive applications, it is critical that it is purged from the system.
These purge procedures should be imple-mented any time a hydrostatic system has been opened to facilitate maintenance or any additional oil has been added to the system.Air creates inefficiency because its compres-sion and expansion rate is higher than that of the oil approved for use in hydrostatic drive systems.
The resulting symptoms in hydrostatic systems may be:
1. Noisy operation.
2. Lack of power or drive after short term op-eration.
3. High operation temperature and excessive expansion of oil.
Before starting, make sure the transaxle/trans-mission is at the proper oil level. If it is not, fill to the specifications outlined on Page 11, Figure 4.
The following procedures should be performed with the vehicle drive wheels off the ground, then repeated under normal operating condi-tions.
1. With the bypass valve open and the engine running, slowly move the directional control in both forward and reverse directions (5 or 6 times), as air is purged from the unit, the oil level will drop.
2. With the bypass valve closed and the engine running, slowly move the directional control in both forward and reverse directions (5 to 6 times). Check the oil level, and add oil as required after stopping the engine.
3. It may be necessary to repeat Steps 1 and 2 until all the air is completely purged from the system. When the transaxle moves for-ward and reverse at normal speed purging is complete.
Let me know and we'll continue...
That bad ones. And that's not intended as a flippant answer, it's accurate. There's no way to know for sure until you tear it down (if it's even necessary after the purge).
The most common things are wear in the cylinder and pistons on either the pump or the motor side, and also malfunctioning poppet valves. Once you take it apart, if necessary, then do a visual inspection of the components looking for signs of damage or wear. You'll be able to see it and feel it if you run your thumbnail across any of the rotating surfaces. Any parts that are damaged should be replaced. And of course all the seals should be replaced any time they are disturbed.
The case inside is pretty straightforward and easy. The hard part is getting the wheel hubs off. They are put on extremely tight so be sure and remove them before taking the transmission off the vehicle. Once it's off, those wheel hubs are almost impossible to get loose.
I'll post a manual for you that may be helpful.