GMC 1976 ZEO 6083 Maintenance Manual page 702

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AIR CLEANER ELEMENT

If the engine develops a "hunting" condition (al-

ternate increase and decrease of engine speed), try

correcting by opening the main adjusting needle a

little more .

Figure 37-Carburetor Adjustment Screws

Figure 36-Air Cleaner Element

ONAN MOTOR GENERATOR

CAUTION : Do not open main fueljet more

than 1/2 turn beyond the maximum power

Before making governor adjustments, run the

unit about 15 minutes under light load to reach nor-

mal operating temperature. (If governor is com

pletely out of adjustment; make a preliminary

adjustment at no load to first attain a safe voltage

operating range) .

Engine speed determines the output voltage and

current frequency of the generator. By increasing the

engine speed, generator voltage and frequency are

increased, and by decreasing the engine speed, gener-

ator voltage and frequency are decreased. An accu-

rate voltmeter or frequency meter (preferably both)

should be connected to the generator output in order

to correctly adjust the governor . A small speed drop

not noticeable without instruments will result in an

objectionable voltage drop . The engine speed can be

checked with a tachometer .

A binding in the bearings of the governor shaft,

in the ball joint, or in the carburetor throttle assem-

bly will cause erratic governor action or alternate

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