21312264 Volvo.Penta Electronic unit

No special skills are required to operate a vehicle with a BrakeSaver. However, it requires the operator to watch the engine speed and the BrakeSaver oil temperature.The BrakeSaver provides auxiliary braking to slow the truck and to control speed on long grades. Governing the deceleration or downgrade speed of a vehicle by using the BrakeSaver results in reduced wear on brake linings and brake drums. It helps save the service brakes for emergency stopping requirements.Braking effort is a direct function of engine speed. The greater the engine speed the greater the braking effort. This applies to all engines, especially those with slower speed economy ratings.The BrakeSaver utilizes the engine oil and cooling systems, which eliminates the need for additional oil or cooling systems.Scheduled maintenance on the BrakeSaver, or additional engine maintenance, is not required.Trucks equipped with the BrakeSaver require an additional amount of engine lubricating oil. See the "Refill Capacities" chart in this publication for proper amount of oil required for a BrakeSaver equipped engine. MANUAL CONTROL: The hand operated control lever is usually mounted on the steering column. It provides a smooth modulated application of the BrakeSaver for desired retarding of the vehicle up to 2300 engine rpm.This controlled modulation of the BrakeSaver is especially desirable on slippery roads. Increasing or decreasing the BrakeSaver action is accomplished by moving the control lever. Actuating the manual Brakesaver control will deactivate the PEEC Cruise control or PTO control. AUTOMATIC CONTROL: The mode selector switch must be in the AUTOMATIC MANUAL position and the PEEC Cruise control ON/OFF switch must be in the OFF position for automatic control. In this mode, the BrakeSaver will automatically be applied when the clutch is engaged and the accelerator pedal is released.The BrakeSaver will automatically shut off when the clutch is disengaged or when the accelerator pedal is depressed. It will engage again when the clutch is reengaged and the accelerator pedal is released. GAUGES: The BrakeSaver CONTROL AIR PRESSURE gauge indicates the pressure at the BrakeSaver control valve. Air pressure should not exceed 50 psi (345 kPa).If the indicator shows reduced or no pressure, the BrakeSaver may not provide any braking effort. Stop the vehicle or operate at a reduced speed. Control vehicle stopping with proper downshifting and service brakes until proper repairs are made.The BrakeSaver oil temperature gauge indicator should register in the NORMAL (green) range. If the indicator moves to the red range, move the BrakeSaver manual control lever to the OFF position.Operate the vehicle with the service brakes only, or stop the vehicle and let the engine idle until the oil temperature registers in the NORMAL range.
Do not exceed 239°F (115°C) maximum engine oil temperature at any time. Do not exceed 2300 rpm in any situation. Overspeeding can result in serious damage to your engine.Operation of the engine over 2300 rpm will cause PEEC to turn the "CHECK ENGINE" lamp on, indicating engine overspeed.
For maximum BrakeSaver effectiveness, select the proper gearing to keep the engine rpm as close to 2300 rpm as possible without exceeding 2300 rpm. BrakeSaver effort declines as rpm goes down. The PEEC TEL (Top Engine Limit) is normally set at rate rpm (plus) +20 rpm.Manual operation adds modulation to the BrakeSaver control and allows the operator to match driving conditions to any load or hill. Do not control the vehicle speed with the accelerator while the manual control is on.Allow a two second delay for full engagement and full disengagement.To prevent unnecessary fuel consumption and possible heat build-up, do not leave the BrakeSaver activated when the engine is idling while parked. Place the control selector switch in MANUAL position, and the manual control lever in the OFF position.Driver Operational Checks
There are two quick operational checks the operator can make to determine if the BrakeSaver is operating properly. Also, if the control valve spool is operating freely in the control.1. To check retarding power: * Place the transmission in NEUTRAL with the vehicle parked.* Run the engine at TEL with accelerator pedal control.* Engage the BrakeSaver fully.* The engine speed should decrease to Engine RPM at VSL (if programmed) and the "Check Engine Light" should turn on. If Engine RPM at VSL is not programmed, the "Check Engine Light" should turn on, but engine rpm will not decrease.
The engine should not run against the BrakeSaver for more than 15 seconds. Allow five minutes between applications to prevent the cooling system from overheating.
2. To check control valve spool free movement: * Start the engine and run it until the air system is at maximum pressure (50 psi [345 kPa]).* Stop the engine and engage the BrakeSaver before the air pressure drops below the maximum pressure.* Disengage the BrakeSaver and listen for a "klunk" sound. This "klunk" sound is the control valve hitting the control valve end cover.This indicates that the control valve is free, the control springs are operating normally and that the air is venting properly from the control valve.