Facts About Generators
GeneratorsDirectoryCompareRepairEnginesControllersPartsManufacturersGuides
Search models or part #
Home›Repair guides›2. | Does adjustment of R26 (damping control potentiometer)

Cummins/Onan — 2. | Does adjustment of R26 (damping control potentiometer)

For these Cummins/Onan models: 300.0 DFT, 350.0 DFU, 350.0 WF, 400.0 DFV, 400.0 WK, 450.0 DFW, 500.0 DFY, 600.0 DWV, YB series.

Applies to: Cummins Onan 300 0 Dft, Cummins Onan 350 0 Dfu, Cummins Onan 350 0 Wf, Cummins Onan 400 0 Dfv, Cummins Onan 400 0 Wk, Cummins Onan 450 0 Dfw, Cummins Onan 500 0 Dfy, Cummins Onan 600 0 Dwv, Cummins Onan Yb Series

Procedure

  1. 1. | Does adjustment of R21 “voltage adjust knob” on the meter panel correct voltage level? _ 2
  2. 2. | Does adjustment of R18 potentiometer on VR21 correct voltage level? — 3 L
  3. 3. | Are rotating diode heat sink mounting screw insulators OK? 4 _
  4. 4. | Are the reconnections correct and secure? 5 —
  5. 5. | Replace voltage regulator VR21. _— —

Source: manual:900-0192 Onan UV 300-600 KW Generators & Controls Service Manual (01-1975).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.