Dump Valve

Each Parker HTG hydrostatic transaxle has a dump valve, which is located on the front side of the transaxle and is easily accessible in the front of each rear wheel. When the dump valve is released, it will allow the operator to easily freewheel the Zero-Turn.

Filter

The oil filter is located on the rear side of the HTG hydrostatic transaxle and is easily accessible with the unit installed in the Zero-Turn. The oil filter is expected to be replaced during each oil change. The break-in oil period is at 300 hours and every 1,000 hours thereafter if Parker HT-1000™ Oil is used.

Oil filters will be available in the Oil Service Kit (70724100).

Further Information

Idler Bracket and Idler Pulley

The Idler bracket and Idler Pulley will place tension onto the transmission drive belt with the idler spring in place. There is a square hole in the end of the idler bracket that allows a technician to insert a 3/8" extension into to help disengage the idler when the belt needs to be removed. The spring is non-adjustable.

Expansion Tank

Each HTG transaxle has a rubber hose and expansion tank to allow for oil expansion during operation. During any oil change or service procedure to the transaxles, take note of the Cold Fill line on the expansion tanks and ensure that the oil level is maintained to this line.

Please note: the expansion tanks are mounted to vertical brackets on the Pro-Turn 600 suspension pod. Upon removal of the pod system, the two mounting bolts for each expansion tank will need to be removed. Take caution to ensure that the expansion tanks are free and clear from the pod during removal and installation.

Fan Assembly

The fan assembly is mounted directly above the input pulley on the HTG Transaxles and is designed to keep the transaxle cool during operation. Each fan has 10 fins, which are critical for proper cooling. If any fins are broken, the fan needs to be replaced.

The fan is held in place by a four-tabbed spacer and 5/8" nut, which has to be torqued to 55-70 ft.-lbs. Parker has a service kit for the Fan Assembly: SK000275.

HTG Service Manual