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The following procedures are used in order to adjust Type I, Type II, and some Type III governors after the governors have been assembled. There are certain governor adjustments that must be made during governor assembly. Refer to the Testing and Adjusting, "Governor (Type) - Assemble" section in this manual.
Install the governor on the 1U-7326 Governor Calibration Bench. Refer to the Testing and Adjusting, "Installation Of Governor On 1U-7326 Governor Calibration Bench " section in this manual.Note: If the governor is equipped with a fuel ratio control, a regulated air supply of 140 to 210 kPa (20 to 30 psi) must be connected to the fuel ratio control during the adjusting procedure.
Remove the plug from the access hole. To remove this plug, use a hammer and a punch to pierce the center of the plug. Then use a suitable tool to remove the plug from the bore.
Do not turn the speed control knob unless the test bench is running. Damage to the variable speed drive may result. Except in the event of an emergency, the speed control knob should always be returned to the slowest rpm setting before the calibration bench is turned off.
Illustration 1 g00660334
(1) Spring (2) Throttle stop adjustment screw (3) Low idle adjustment screw (4) Load stop adjustment screw
Loosen low idle adjustment screw (3). Loosen throttle stop adjustment screw (2). Both screws should be backed out so the end of the screw is not extending past the face of the housing.
Connect spring (1) to the test bench and to the throttle in order to hold the throttle against the throttle stop.
Use a 1U-6672 Rack Adjusting Wrench to loosen load stop adjustment screw (4). Loosen the load stop adjustment screw until the end of the screw is even with the face of the governor housing.
Illustration 2 g00660344
(5) Tachometer (6) Speed control knob
Connect the test bench to a 240 V electrical outlet. Turn on tachometer (5) .
Turn the switch for the test bench to the ON position.
Turn speed control knob (6) in the counterclockwise (CCW) direction to the slowest speed. Check all fluid connections for leaks. If leaks are found, perform any necessary repairs.Note: If any of the adjustments for the function checks cannot be performed during the governor setting procedure, stop the procedure and inspect the governor for possible problems.Note: Always approach a specified rpm setting from a minimum of 100 rpm above the rpm that is required. This will ensure that the test readings are consistent for the entire test procedure.Note: All specifications for the governor adjustment procedure are in the Technical Marketing Information (TMI). If no values are listed in the specifications for a particular functional test, proceed to the next step in the test.Note: The tolerances that are found in the "Governor Performance Data" are applicable to all of the governor adjustments. The Expanded Tolerance Band that is referred to in the governor checking procedure is applicable to rechecking a governor that has been previously adjusted.
Illustration 3 g00660334
(1) Spring (2) Throttle stop adjustment screw (3) Low idle adjustment screw (4) Load stop adjustment screw
Adjust the speed on the calibration bench to the "LOAD STOP ADJ" rpm that is specified in the TMI. Adjust load stop adjustment screw (4) to the output dimension that is specified in the TMI.
Tighten the locknut for load stop adjustment screw (4) and check the output dimension again.
Increase the speed on the calibration bench by at least 100 rpm. Reduce the speed on the calibration bench back to the "LOAD STOP ADJ" rpm that is specified in the TMI. Check the output dimension again.
If the dimension is not within the "RECHECK TOL" that is specified in the TMI, repeat Step 9.
Adjust the speed on the calibration bench to the "FUNC CHECK #1" rpm that is specified in the TMI. The output dimension must be a maximum of 0.0 mm (0.00 inch).If the output dimension is more than 0.0 mm (0.00 inch), the bearing block assembly must be repositioned. Move the bearing block assembly toward the riser shaft approximately 0.5 mm (0.02 inch). Refer to the Disassembly and Assembly, "Governor (Type) - Disassemble" and Disassembly and Assembly, "Governor (Type) - Assemble" procedures in this manual. Return to Step 9 after installation.
Illustration 4 g00660348
(2) Throttle stop adjustment screw (3) Low idle adjustment screw
Adjust the speed on the calibration bench to the "THROT STOP ADJ" rpm that is specified in the TMI. Adjust throttle stop adjustment screw (2) in order to obtain the output dimension for the "THROT STOP ADJ". Tighten the locknut for throttle stop adjustment screw (2) and check the output dimension again.If the output dimension for the "THROT STOP ADJ" cannot be obtained due to a low output dimension, it will be necessary to move the bearing block assembly away from the riser shaft approximately 0.5 mm (0.02 inch). This will increase the adjustments that are capable for the output dimension. Refer to the Disassembly and Assembly, "Governor (Type) - Disassemble" and Disassembly and Assembly, "Governor (Type) - Assemble" procedures in this manual. Return to Step 9 after installation of the bearing block assembly.Note: After adjustment, at least 2.0 mm (0.08 inch) of the throttle stop screw should extend past the housing surface. This will enable the high idle to be set with the governor on the engine.
Increase the speed on the calibration bench by a minimum of 100 rpm. Then reduce the speed back to the original "THROT STOP ADJ" rpm. Check the output dimension for the "THROT STOP ADJ".If the output dimension is not within the specification that is specified in the TMI, repeat Step 14.
Adjust the speed on the calibration bench to the "FUNC CHECK #2" rpm that is specified in the TMI. The output dime