Washer wont spin

Hello, I have a washer wbsr3140daww, It would not spin or agitate, I have replaced the motor, lid switch and timer and belt. I blew in the plastic hose which leads to the water fill switch and the washer agitates but when I place the washer timer in spin it will NOT spin. Any suggestions or could the water fill switch need to be replaced.

Does the motor run when it’s in spin mode? If so, is the larger pulley under the transmission rotating? If it’s rotating but transmission is not rotating, the transmission is bad. Check the pressure hose where it connects to the lower left side of the tub. Clean out any gunk in the hose as well as in the air dome on the side of the tub. The air dome is not removable, you have to squirt hot water into the hose nipple. Be careful not to break the hose nipple off.

Eric