Diesel Engine Troubleshooting

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Bosch ROV Governor Diagram

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The RQV governor is a variable-speed mechanical unit that employs the governor springs assembled into the weights in the same manner as that for other RQ models. As such, it controls idle speed, maximum speed, and any speed range in between at which the operator places the throttle linkage. Figure above illustrates the pear-shaped housing of the RQV governor, which is also found on all other RQ models.

The RQV governor is used with the models M,A,MW,and P Bosch inline multiple-plunger pumps, as well as on the VA and VE models of Bosch distributor pumps. Major truck engine manufacturers that use RQV variable-speed governor are Deutz, Fiat Allis, Navistar (International Harvester), Mack, Mercedes-Benz, and Volvo.The RQVis employed on vehides with auxiliary drive, such as garbage compactor trucks, tanker trucks, and cement mixer trucks, to control the PTO (power takeoff) applications. Since the RQV is a variable-speed (all-range) governor, it operates on the same basic principle as the RSV shown and discussed earlier in this chapter, the only difference being in the internal linkage arrangement. The RSVuses a starting and main governor spring, while the RQVhas the springs assembled inside the weight carrier.

The difference between the RQ governor model and the RQV is that since the RQV is an all-range variable-speed unit, and the RQ is a minimum/maximum (limiting-speed) unit, the weights in the RQV will move out throughout the complete speed range, and will not lose control between the end of the idle speed range and the start ofhigh-speed governing such as occurs within the RQ model.

Written by Ed

September 6th, 2011 at 2:28 am

Posted in Bosch Fuel Systems

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Bosch RSV Governor Diagram

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The RSVgovernor assembly is designed as an all-range (variable) governor which functions to control the engine idle and maximum speeds, in addition to allowing the operator to place the throttle at any position between idle and maximum where the governor will control the speed setting minus the droop The RSV governor is widely used on combination on- and off-high way truck applications, as well as farm tractors and industrial and marine units employing the M, A, MW,or P Bosch model inline multiple-plunger injection pumps. Although similar in external appearance to the RS limiting-speed (minimum/maximum) governor described in this section, the RSV does allow several adjustments at points outside the housing that are not available on the RS unit. Figure above illustrates an external view of the RSV governor housing with the various external adjustments shown. These include:

• The idle-speed screw
• The auxiliary idle-speed spring or bumper screw
• The throttle lever linkage maximum speed adjusting screw

Written by Ed

September 6th, 2011 at 2:07 am

Posted in Bosch Fuel Systems

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