Pressure ranges from —0- to 78 psi. Lube pressure will be affected by the fluid viscosity flow rate and the bushing to shaft clearance. Lube pressure can be as high as 30 psi. This might sound confusing in print, but when you do it, the ports will be evident and easy to close with an opposite hand. Sufficient pressure at operating temperature indicates the filter, pump and both primary and secondary regulators are functioning.
This transmission can be fitted to various vehicles from different manufacturers, including General Motors, Volvo, Saturn, Nissan, Saab, Opel, and Renault. Enlarging the plate feed holes is not suggested if the valve body casting has excessive wear at the secondary regulator bore, in the area of the spring to spool surface. Pressure and Fill: All the pressure plugs have a 12mm head. Having a stuck cooler valve or broken spring will cause cooler or lube pressure to be too high. At The Transmission Shop, our modern diagnostic equipment and certified technicians take pride in our ability to diagnose and repair these transmissions, in some cases saving you as much as 70% off a major overhaul.
The torque converter clutch valve and spring prevents the cooler fluid from reversing direction. Before you pay another shop for this extensive work, let us check out your transmission at one of four The Transmission Shop locations in Lewisville, Garland, McKinney, or Plano. Improper adjustment will reduce cooler flow substantially. The B-4 circuit has extensive valve body control and includes a tube with o-ring ends that feed the servo. Normal lube pressure at the port indicated; -10 F.
As your vehicle moves, the toothed gear passes by the sensor and emits a frequency or square wave. Excess wear appears as a discoloration, or polished area, in the shape of a moon phase, generally at the ends of the bore or opposite side of fluid entry see Figure 6. The neutral relay valve controls the route of fluid into the forward clutch circuit. One of the issues we have seen is that some people with vehicles that have this type of transmission think that adding fluid will correct their problem. That inspection should include all the removable sleeves, both regulator valves and the solenoid modulator bore.
V alve Body Inspection: There are many variations, which complicate coring and matching parts. The lube pressure tap is between the secondary regulator valve and the main shaft bushings. The shift solenoids should be checked for proper flow when open and their seal when closed. Loosening this plug will release the band, causing a no 3rd condition, and in some vehicles, it may require removing the transmission to reapply the band correctly. At The Transmission Shop, we are standing by ready to serve you.
If you have adjusted to this point, you are beyond resolving a problem with a solenoid adjustment. The three planetary gear sets provide five forward speeds and one reverse speed. Even if someone else told you that you needed an entirely new transmission, itmay only needan adjusted or replaced sensor. Engagements at this time are abrupt. The linear solenoids determine the engagement by adjusting hydraulic pressure.
It boosts secondary regulator valve, converter and lube pressure and controls 2-3 shift at the B-4 control valve. The modulator valve spring produces the force that regulates the pressure so that it equals line pressure. Because of a heavy snow cover, it cannot be assumed the ice is sufficient for support. Of course, not all transmissions can be repaired with a minor procedure, as some vehicles actually will require more repairs than others, including possible transmission rebuilds or replacements. C-1 psi will then follow load, with a maximum near 200 psi.
It is not accessible in the vehicle. Three linear solenoids are calibrated to the valve body. The Saab, cooler element will require an adapter, but most units are easily accessible. Typical C-1 pressure is -0- in Park. Transmission experts recommend regular fluid changes, at least every 30,000 miles. Under an electronic failure, the solenoid is designed to go into maximum line pressure. Figure 5 identifies visual changes.
Positioning the band requires removal of the servo, at best and possibly the complete transmission. A 3 mm Allen wrench, will pass approximately 1. What you cannot see may result in a sink or swim experience. The forward clutch valve responds to your throttle signal, and depending on the gear selected, this valve regulates drive fluid at the forward clutch oil circuit that applies the pressure to the forward clutch. If the pressure curve of both C-1 and B-4 are parallel, C-1 initial engagement is near 50 psi, and the 2-3 is harsh, the vehicle may require a flash update, but perform a key cycle and numerous drive cycles first. It is best to let a certified and experienced transmission mechanic do this to avoid any potential mistakes or problems.