Barko Hydraulics 495B SD, Service Manual

Page: 65 / 101

Operation and Maintenance Manual
495B ML TM (S)
65
Last Updated - 08/31/2016
ELECTRIC COLLECTOR MAINTENANCE
COLLECTOR DESCRIPTION
The electric collector is designed for maximum efficiency with a minimum of maintenance. Located at the center of
rotation, collector rings (on the core assembly) maintain full electrical contact at all times between a rotating member
with continuous (360 degree) rotation and a stationary member. Without the collector, the wire harness would twist off
and electrical contact would be lost.
On all circuits from 10 to 30 amp capacity, the brushes ride on a 3/16" wide brass ring.
One brush pair per circuit is used on 10 to 20 amp circuits.
Two brush pairs per circuit are used on 30 amp circuits.
On circuits with 45 and 75 amp capacity, the brushes ride on a 3/8" wide brass ring.
A single pair of wide brushes is used on 45 amp circuits.
Two pair of wide brushes are used on 75 amp circuits.
On circuits with special 7.5 amp capacity, the brushes ride on a 3/32" brass ring.
Brushes are fastened to the brush arms to allow pivoting of the brushes. This assures complete contact at all times
between the brush and the brass ring, and is especially important if an orbiting condition develops as the equipment
ages.
COLLECTOR MAINTENANCE
Under normal operating conditions, the self-cleaning brushes will last the life of the equipment. However, if the
collector is not revolved for some time, it will collect fine silt (or, in a salt atmosphere, corrosion may result). If this
happens, the equipment should be rotated through several revolutions if possible. The cleaning action of the brushes
should clean the ring surfaces. If it does not, or if it is not practical to revolve the machine, it may be necessary to
use a standard non-residue solvent to clean the rings. Then lightly sand the brushes and rings with a fine grade of
sandpaper and dust off with compressed air.
The brush assemblies can be replaced if needed. See Brush Assembly Replacement.
Knife Disconnect Terminals
with Plastic Sleeves
Mounting Tube
(fastened to stationary
member of machine)
Brush Harness
Center Harness
Set Collar (socket screw-type)
Cap Screw
Cover
Outboard Bearing (nylon)
Base Bracket
Brush Holding Stud
Base Bracket Connector
Brush/Arm/Spring Assemblies
Acorn Nut
Hex Lock Nuts
Nylon Rub Disk
Set Screw-Type Connectors
Jam Nuts
Nylon Bearing
Core Assembly (has brass rings that brushes
ride on)