Diesel Engine Troubleshooting

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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