Operating Pressures

Working pressure circuit consists of working pressure control valve, basic pressure control valve, 2 two-way check balls, a modulating pressure relief valve, a one-way valve and restrictor. Working pressure circuit is controlled by position of accelerator pedal, vehicle speed, selector lever position, and gear engaged.

Working pressure, governed by working pressure circuit, operates brake B-3, brake bands and clutches. Pressure level is adapted to particular operating condition, regardless of quantity of oil supplied from primary pump or secondary pump. This enables primary pump capacity to be kept as low as possible and the transmission to achieve high efficiency.

Working pressure is always the highest pressure in hydraulic system. All other operating pressures are derived from this pressure and reduced by control valves to a lower pressure level. The following governed pressures control hydraulic system and operate shift element.

• Reduced Operating Pressure
• Governor Pressure
• Lubricating Pressure
• Modulating Pressure (Vacuum Controlled)
• Modulating Pressure (Governor Controlled)
• Full Throttle Pressure
• Load Dependent Control Pressure
• Kickdown Control Pressure
• Boosted Governor Pressure
• Shift Pressure