NEW Hydro-Gear ZT-3100 Transaxle LEFT HAND. Entry-level commercial-grade ZT-3100 transaxle with a 1 axle shaft, high-efficiency 10cc pump, and 16cc motor. HIGH TORQUE AND 8-9 MPH PERFORMANCE. Guaranteed fit for specific. Models and compatible with several. Gravely & BAD BOY. (Left Hand) transaxle is a commercial-grade ZT-3100 drive system used primarily in high-end zero-turn mowers. Fitment & OEM Cross-Reference Chart. OEM Part Number (LH). This specific Hydro-Gear model number. Is the direct factory replacement for Country Clipper part numbers. Gravely & Bad Boy. Models use the ZT-3100 series, they often use different internal gear ratios or control arm configurations e. ZL or ZJ prefixes. Always verify that your units have the. These units feature a 4-bolt mounting pattern and are designed for mowers with a Gross Vehicle Weight (GVW) of up to. Many buyers mistakenly look at the. (ZH/ZJ) which looks identical but has lower torque capacity. 350 lb-ft torque output. BANG A GONG LET’S GET IT ON! WE WANT YOUR BUSINESS FOREVER! ELITE PRODUCT, GREAT PRICES &. THE PHOTOS ARE FOR REFERENCE ONLY! MAKE SURE THE PART FITS BASED OFF YOUR PART NUMBER AND NOT OFF THE PHOTO!!