I have a '95 Ariens ZTR residential grade ZTR and the left drive motor will not pull like the right one. I broke the plastic supply fitting and did not realize it until it had run about 200 feet. Machined a new fitting out of brass since a replacement was 32 bucks. Just could not see paying that for a piece of plastic. Refilled the hydraulic reservoir and it will pull ok sometimes but will slow down and/or quit pulling. Has what may be described as pump cavitation noise. Other side is quiet and smooth. A new one is $920.00, just can't see that either. Refilled with correct hydraulic fluid. Are there rebuild kits for this? Or what direction do I need to look next? You can email me directly at email@example.com. Thanks in advance for any insight into my problem.