Onan 6GO-F - Page 42

SERVICE DIAGNOSIS
POSSIBJ,& CAUSE
ENGINE RUNS· BUT ClJR.RF1~T DOES NOT BUILD UP
Poor brush contact or dirty
See that brushes seat well, are free
commutator or slip rings. in holders, are not worn too short,
and have good spring tension.
Open circuit, short circuit,
See GENEfU\TOR, replace part nec-
or ground in generator.
essary.
CURRENT UNSTEADY BUT ENGINE NOT MISFIRING
Speed too low. Adjust governor to correct speed.
Poor commutation
or brush
See
that brushes seat well on com-
contact.
mutator and slip rings, are free in
holders, are not worn too short, and
have good
spring tension.
Loose connections.
Tighten connections.
Fluctuating load.
Correct any abnormal
load condition
causing trouble.
TAPPING SOUND
Tappet clearance too great.
Adjust or replace tappets.
Broken valve spring.
Install new spring.
HOLLOW CLICKING SOUND WITH COOL ENGINE UNDER LOAD
Loose pistons.
If noise only slight and disappears
.when engine warms up, no immediate
attention needed. Otherwise replace
worn parts.
VOLTAGE LOW AT FAR END OF LINE BUT NORMAL NEAR POWER UNIT
Too small line wire for load Install larger or extra wires or
and distance.
.reduce load.
MOTORS RUN TO SLOWLY AND OVERHEAT AT FAR END
OF LINE BUT OK NEAR POWER UNIT
Too small line wire for load
Install larger or extra wires , or
and distance.
reduce load.
NOISY BRIJ$lES
High mica between bars of
Undercut mica .. ' See. GEI'lERATOR.
CQ1Dll1Uta.tor.