Hydro-Gear ZT-3400 Hydrostatic Transaxle ZS-KPEE-SCLC-3JLX Zero Turn Mower. Genuine Hydro-Gear ZT-3400 transaxle, model number ZS-KPEE-SCLC-3JLX. Hydro-Gear Service Parts for This Unit. 73245 Main Housing Left Charge Control Kit. 73257 Side Cover Left Kit. 71971 Block 12cc Kit. 71446 Hub 4 Bolt Kit. 71854 Filter Guard Kit. 71393 1/2 Beaded 9/16 SAE Fitting Kit. 72291 Gerotor Seal Kit. 71973 Center Section Left Charge Kit. 71436 Charge Relief Kit. 71977 Charge Pump Kit. 71978 Input Shaft Kit. 71593 Return to Neutral Counterclockwise Kit. 73121 Inboard Right Rotation B / Left Rotation A Kit. Complete units are built to an exact configuration. Match the full model number on your unit’s Hydro-Gear label (first line) to this listing character for character. The second line on the label is the cross reference number.