Onan UF Series Instruction Manual And Parts Catalog page 42

M A I N T E N A N C E 11
GENERAL SERVICING. - The generator is designed to give long and
satisfactory service when properly cared f o r .
Regular servicing as outlined here w i l l be well worth the effort required.
The ball bearings are the double-sealed pre-lubricated type and do not
require future lubrication.
To l i f t brushes away from contact, f i r s t remove the brush spring (con-
stant pressure type) from its holder, then remove the brush f r o m its
guide, as illustrated. Do not pull the brush out as may be done when
spiral type springs are used. Do not unwind the spring past the end of
its support plate. A spring so distorted or kinked must be replaced
with a new one.
INSTALL BRUSHES WITH BEVELLED
TOP SLANTING DOWN TOWARD
SPRING HOLDER ^
TO R E M O V E BRUSH
S P R I N G P R E S S
S P R I N G H O L D E R
D O W N A N D O U T A S
S H O W N IN B R O K E N
L I N E S . T = r A 5 1 3
- C o m m u t a t o r -
TO REMOVE ^
SPRING LIFT l l j N O T E - S P E C A
S \ M O D E L S
ONLY
UP ON TAB
A S M
- S l i p R i n g -
FIG. 3 - BRUSHES AND SPRINGS (Constant Pressure Type)
BRUSH CONTACT. - Maintain good electrical full brush contact at all
times.
Each 200 hours of operation, or once a month, clean the commutator
and slip rings with a dry, lint free cloth. Do not attempt to maintain a
bright, newly machined appearance. A dark, glossy appearance is
normal. Heavy deposits or slight roughness may be remedied by care-
ful sanding with #00 sandpaper. Hold the sandpaper flat against the
commutator, or slip ring, while the generator is operating. Use a flat
wooden stick, with light pressure, to hold the sandpaper. Never use
emery or carborundum cloth or paper. Wipe or blow out accumulations
of brush dust, which may cause a short circuit.
It is not necessary to remove the brush r i g or end bell when installing
hew brushes or cleaning the commutator. The brushes, commutator
and slip rings are easily reached by removing the end bell cover.
Brushes eventually wear too short to perform their function. Brush
wear will be more rapid under dusty operating conditions. Replace
brushes with new ones only when worn to 5/8 inch in length. The brush
springs provide equal pressure as the brushes wear shorter in use.