#HHTA0-59900 Hydraulic Filter

Kubota Hydraulic Filter (#HHK20-36990)

The #HHK20-36990 is a genuine Kubota hydraulic filter. You’ll typically find it used in the transmission or hydraulic system on compact tractors and mowers. Its job is to catch any metal shavings, dirt, or gunk floating around in the hydraulic fluid before it can mess up pumps, valves, or other components downstream.

What it does:

This spin-on filter screws right into the hydraulic circuit. It’s usually part of a regular service — when you're draining the transmission or changing hydraulic fluid, this filter should get swapped out too. Running dirty fluid through the system is a good way to tear up expensive parts, so it’s worth staying on top of it.

Where it’s used:

This filter fits a bunch of Kubota machines. You’ll see it on equipment in the:

• B Series compact tractors
• BX Series sub-compacts
• F Series front-mount mowers
• G Series garden tractors
• ZD and ZG Series zero-turn mowers
• RTV Series utility vehicles
• See below for the complete list

It replaces part number K2561-36990, so if that’s what your manual shows, this is the updated version. It's a quick job — usually just unscrew the old one, oil the gasket, and spin the new one on. Just make sure to have a catch pan ready.