Hydra-Test HT-2000 The portable Hydra-Test HT-2000 unit allows the operator to test the hydraulic integrity of the individual components in the automatic transmission unit. With a simple connection, clutch and band operation can be diagnosed. Bench testing the transmission unit can save valuable time by reducing unnecessary installation and removal of the automatic gearbox from the vehicle. A test plate is attached to the transmission. Then using the flow meter, the operator performs a test to indicate the amount of leakage at the piston or servo seals. A pass/fail condition can be determined.