What do check balls do in a valve body?
A check ball valve sits in a seat in the valve body. It allows or blocks fluid flow according to the direction of flow. They are either normally open or closed, depending on the application and manufacturer. The spool valve is the most common valve found in automatic transmissions.
What is a check ball in a transmission?
Fluid pressure causes a check ball that sits in a pocket to block and unblock on orifice that fluid is flowing through or trying to flow through. This controls the timing and redirection of fluid flow.
How many check balls are in a 4 L 60 E transmission?
7 check balls
Check ball locations in GM’s 4L60E transmission valve bodies. There are a total of 7 check balls used in valve bodies 1993-2007.
What are the symptoms of a bad valve body?
The valves will wear down, the channels can be abraded and become oversized, and the whole valve body unit can become warped. Signs of a bad valve body can be fluid leaks, slipping during gear changes, or even failure to go into gear.
How do you check ball valve attain it function in hydraulic system of automatic transmission?
Check valves only allow fluid to flow in one direction. When pressure is higher on the ball side it pushes the ball or poppet against the spring and opens a path for the fluid to pass. When pressure is higher on the spring side the ball or poppet closes against the seat and flow stops.
What can a bad valve body cause?
Symptoms of a Failing Valve Body
- Delayed Garage Shifts. One of the most common symptoms of a failing transmission valve body is a delay in shifting or harsh shifting.
- Incorrect Shifting. When driving, you could notice the transmission shifting into higher or lower gears at the wrong time.
- Shift Flares.
- Gear Slippage.
What are the three types of check valves used in hydraulics?
Based on the functions, hydraulic valves are classified into a directional control valve, hydraulic pressure control valve, and hydraulic flow control valve.