Tweco A 2000 Ultra-Feed - Manual (Page 31)

ULTRAFEED A 2000
May 1, 2006 5-1
SECTION 5:
SERVICE
5.04 System Maintenance
Scope
The troubleshooting guide is intended to be used by
qualified service technicians. The troubleshooting guide
contains information which can be used to diagnose and
correct unsatisfactory operation or failure of the various
components of the wire feeder. Each symptom of trouble
is followed by a list of probable causes and the procedure
necessary to correct the problem.
Safety
To ensure safe operation and service, read this entire
manual before attempting to service or repair this
machine. The service technician may be asked to check
voltage levels while the machine is turned ON. To assure
safety, use care and follow all instructions accordingly.
5.05 Troubleshooting Hints
Examine connections for proper assembly and contact
before replacing an electrical component or printed circuit
board. Wire lugs should be in tight contact with the lead’s
conductor and should be crimped to the lead’s insulation.
The mating surfaces of the connection should be clean
and free of oxidation.
Faulty connections or wiring problems are often the cause
of an equipment malfunction!
Do not pull on wires to disassemble connections. Firmly
grasp each lug or connector when disconnecting. Pulling
on wires for disassembly can damage the integrity of the
connection and cause future malfunctions.
Prior to disassembly or servicing of the machine, note
the wiring and connections in the machine. Reassembling
should place the wires in the same location and routing
as received from the factory. Keep wires and leads away
from hot parts and sharp objects.
All signals referenced in the following troubleshooting
guide can be measured with a digital multimeter (DMM).
5.01 Cleaning The Unit
Periodically, clean the inside of the wire feeder and feedhead
assembly by using a vacuum cleaner or clean, dry,
compressed air of not more than 25 psi/172 kPa/1.72 bar
pressure. After cleaning the unit, check all electrical
components for loose or faulty connections and correct if
necessary.
5.02 Cleaning The Feed Rolls
Clean the grooves on the lower drive roll frequently. This
cleaning operation can be done by using a small wire
brush. Also, wipe off or clean the grooves on the upper
roll. After cleaning the feed rolls, tighten the feed roll
retaining knobs accordingly.
5.03 Feedhead Maintenance
The only point of maintenance in the feedhead assembly
is the motor brushes. Inspect these about every 300 hours
of operation. When these brushes are worn to about 1/8"
(3.2 mm), new brushes should be installed.
CAUTION
Neglect in brush maintenance may cause
damage to the drive motor commutator
resulting in a shorter motor operating life.
Feed Motor
Brush Holders
Brush
407191-2
Cap
407190-1
Art # A-04195
Figure 5-1: Brush Maintenance