Where is the accumulator valve in an automatic transmission?
Automatic Transmission Accumulators. The accumulator valve is located in the valve body. It varies and regulates pressure according to demand. This pressure works with the spring on the opposite end of the accumulator piston. An increase in throttle pressure will increase the pressure on this end of the piston providing a firmer shift.
How does the spring in an accumulator work?
A spring keeps the piston at the top of its bore when the circuit is idle. As pressure increases in the circuit the accumulator piston is allowed to stroke downward in it’s bore. This absorbs some of the pressure from the circuit softening and delaying the shift.
How does an accumulator shift feel in a clutch?
They absorb the initial shock of high pressure in the apply circuit. When a clutch or band’s piston or servo first strokes, there is little pressure in the circuit. As soon as the piston or servo bottoms and the device starts to apply, pressure increases rapidly.
When does an accumulator apply a shift modifying device?
When a clutch or band’s piston or servo first strokes, there is little pressure in the circuit. As soon as the piston or servo bottoms and the device starts to apply, pressure increases rapidly. Without a shift modifying device like an accumulator, the device will apply to suddenly and harsh shifting would occur.
Automatic Transmission Accumulators. The accumulator valve is located in the valve body. It varies and regulates pressure according to demand. This pressure works with the spring on the opposite end of the accumulator piston. An increase in throttle pressure will increase the pressure on this end of the piston providing a firmer shift.
Why does the throttle return spring stick open?
When it works properly, it helps to slow the vehicle down. When it’s broken or wearing out, the throttle may stick wide open, causing a potentially dangerous situation. The throttle return spring is attached to the throttle cable or it can be attached to the throttle body or carburetor.
What causes shifting stick to slip when changing gears?
If the shifting stick slips regularly when changing the gears, then there is likely a problem with the transmission valve body. Your shifting stick should never slip if the transmission valve body functions properly. That means there is something wrong. 3. Difficulty in Downshift
A spring keeps the piston at the top of its bore when the circuit is idle. As pressure increases in the circuit the accumulator piston is allowed to stroke downward in it’s bore. This absorbs some of the pressure from the circuit softening and delaying the shift.