19424 Mercury SPARK PLUG(NGK#BP8HS-15) 15 H.P.

These devices should not be used as a primary or service brake.
Certain auxiliary engine braking devices are approved for use on these engines. Refer to the Truck Engine Application and Installation Guide or see your Caterpillar dealer for more information.Engine Retarder
The antilock braking system (ABS) of this vehicle may interrupt the operation of the engine retarder(s) during the ABS actuation. The engine retarder(s) are a BrakeSaver or a compression brake, and/or an exhaust brake. Refer to the literature of the vehicle manufacturer regarding the operation of the ABS.Engine retarders and exhaust type retarders generate maximum retarding power at the engine's maximum rated rpm. As the engine rpm decreases, so does the retarder performance. For maximum available retarding, operators should select a gear which will provide the desired road speed at the highest allowable engine rpm.On long downhill grades, an operator should establish a "control speed". The "control speed" is the speed at which the force that pushes the truck is equal to the retarding force that slows the truck, with little or no use of the service brake.To maximize the benefit of the retarder, the retarder should be used anytime that the operator wants to slow the truck. Retarders should be left in the ON position during all normal operating conditions.The operation of any vehicle under slippery conditions requires caution. This is also true when operating a truck retarder. As a general rule, start with the retarder OFF and ensure that the truck maintains control through natural retardation. Then activate the retarder at the lowest power setting and increase the power setting as the conditions allow.BrakeSaver Operation (3406C Only)
If your vehicle is equipped with both ABS (anti-lock braking system) and BrakeSaver, the brakesaver needs to be manually deactivated during wet or slippery conditions. Failure to do so could reduce vehicle control and result in personal injury or death.
The brakesaver should NOT be used as a primary or service brake. The BrakeSaver is not an emergency or quick stop brake. Use the service brakes for quick stops.
Do not exceed 116°C (240°F) maximum engine oil temperature at any time.Do not exceed 2300 rpm in any situation. Overspeeding can result in serious damage to your engine.
The BrakeSaver provides auxiliary braking to slow the truck and to control speed on long downhill grades. Controlling the slowing or downhill 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.No special skills are required to operate or maintain a vehicle equipped with a BrakeSaver. However, it requires the operator to observe the engine speed and BrakeSaver oil temperature.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.Manual operation 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.Manual Control
Manual control lever.The hand operated manual control lever is usually mounted on the steering column. To increase or decrease the BrakeSaver, move the manual control lever. Allow a two second delay for full engagement and full disengagement. Actuating the manual BrakeSaver control will deactivate the cruise control or the PTO control.Automatic Control
The mode selector switch must be in the AUTOMATIC MANUAL position and the Electronic system Cruise Control ON/OFF switch must be in the OFF position for automatic control. In this mode, the BrakeSaver will automatically be engaged when the clutch pedal is applied and the accelerator pedal is released.The BrakeSaver will automatically shut off when the clutch pedal is released or when the accelerator pedal is pressed. It will engage when the clutch pedal is applied again and the accelerator pedal is released.Gauges
CONTROL AIR PRESSURE should not exceed 390 kPa (55 psi). If the indicator shows little or no pressure, the BrakeSaver may not provide any braking effort. Control the vehicle stopping with proper downshifting and service brakes until repairs are made. Stop the vehicle or operate at a reduced speed.The BrakeSaver oil temperature gauge indicator should register in the NORMAL (GREEN) range, less than 116°C (240°F). If the indicator moves to the RED range, place 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.To prevent unnecessary fuel consumption and possible heat buildup, 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.Compression Brake
The compression brake controls may include a dash mounted module or an ON/OFF switch and a three position "LO", "MED" and "HI" switch. The compression brake control setting depends on how many cylinders of braking are desired.Some applications are equipped with a multiposition switch to provide variable retarding capability. Operators should become familiar with the controls on their vehicles. Refer to the Truck or OEM Owners Manual for the type of operating controls that your truck is equipped with.Refer to the Truck Engine Application and Installation Guide or the Service Manual for more information.