How to Change the Transmission Fluid in your Heavy-Duty Transmissions

In this post, you will learn how to change the transmission fluid (HT-1000) in Parker's HTG hydrostatic transmission in your mower. The HT-1000 Service Kit includes all the replacement parts needed for a smooth fluid change.

The transmission fluid in your mower should be changed at regular intervals to maintain the life of the mower. The HT-1000 transmission fluid only needs to be changed once every 1000 hours, as opposed to as early as 500 hours with other brands. Our Hydrostatic Transmission Fluid HT-1000™ is a synthetic transmission oil engineered to provide maximum durability and long life for heavy-duty hydrostatic drive systems.

Making oil changes simple and efficient

Our transmissions for off-road vehicles are designed to make oil changes very quick and simple, and the new service kit makes the process even easier by providing all the necessary oil change components. Contact your local dealer for more information!

Each transmission includes a low-speed, high torque motor (Torqmotor) integrated with a hydraulic pump to provide an all-in-one transmission package. the transmissions are ideal for zero-turn mowers, golf course maintenance equipment, and light-duty utility vehicles.

Each HTG service kit includes:

(2) gallons of HT-1000
(2) replacement filters
(2) plugs w/ washers

Watch how to change your transmission oil in this video:

How to Change Your HT-1000 Using a Parker Hydrostatic Transmission Service Kit step-by-step:

1) Remove Plug from the Transmission Bottom Cover

How to Change the Transmission Fluid in your Heavy Duty Transmissions | Remove plug from the transmission | Parker Hydraulics Pump and Motor Division

2) Remove Vent Plug from the Top of Transmission

How to Change the Transmission Fluid in your Heavy Duty Transmissions | Remove vent plug | Hydraulics Pump and Motor Division

3) Remove Filter from Transmission

How to Change the Transmission Fluid in your Heavy Duty Transmissions |3) Remove Filter from Transmission | Hydraulics Pump and Motor Division

4) After Oil is Drained, Insert New Filter

How to Change the Transmission Fluid in your Heavy Duty Transmissions | Insert New Filter | Hydraulics Pump and Motor Division

5) Install New Transmission Plugs

How to Change the Transmission Fluid in your Heavy Duty Transmissions | Install new transmission plugs | Hydraulics Pump and Motor Division

6) Lower the Mower

7) Raise the Seat

8) Remove Expansion Tank Cap

9) Add HT-1000 Fluid to Tank

How to Change the Transmission Fluid in your Heavy-Duty Transmissions | Add HT-1000 to the Tank | Hydraulics Pump and Motor Division

10) Re-install Cap and the Vent Plug

11) Close the Seat

That's it! After completing these simple steps, you will have successfully changed your HT-1000 transmission fluid.

Our Pump & Motor Division (PMD) is a market leader in gear pump and low speed-high torque gerotor motors. PMD continues to blaze a trail by developing new technologies while maintaining a high level of service synonymous with Parker. Between the two divisions in North Carolina and Tennessee, the PMD team members have decades of industry experience to better serve you and your application.

Article contributed by CT Lefler, marketing product manager, Pump, and Motor Division.