Lincoln Electric IM790 SP-175 Plus - Manual (Page 24)

MAINTENANCE
SAFETY PRECAUTIONS
ELECTRIC SHOCK can kill.
• Disconnect input power by remov-
ing plug from receptacle before
working inside SP-175 Plus . Use
only grounded receptacle. Do not
touch electrically
“ hot ” parts
inside SP-175 Plus .
• Have qualified personnel do the
maintenance and trouble shooting
work.
ITEMS REQUIRING NO
MAINTENANCE
• Drive Motor and Gearbox – Lifetime lubrication
• Fan Motor- Lifetime lubrication.
• Wire Reel Spindle – Do NOT lubricate shaft.
ROUTINE AND PERIODIC MAINTE-
NANCE
BEFORE EACH USE
• Check over machine and accessories for any obvious
condition that may prevent safe performance or oper-
ation, repair or replace items as necessary to correct
any abnormal condition.
AFTER 5 MINUTES OF WELDING
or when spatter accumulates in nozzle
• Clean nozzle to avoid bridging between nozzle and
contact tip which results in shorted nozzle, poor welds
and overheated gun. Hint: Anti-stick spray or gel
available from a welding supply supplier may reduce
buildup and aid in spatter removal.
AFTER EACH SPOOL OF WIRE FEED
• Remove contact tip and clean inside diameter with
short piece of wire
• Clean cable liner – when rough and erratic wire feed-
ing occur.
MAINTENANCE
D-1
D-1
WARNING
AFTER FEEDING 50# OF FLUX CORED
WIRE OR 300# OF SOLID WIRE
• Unplug machine or turn power switch to OFF – “ O ”
position. Remove gun and cable from machine.
• Remove gas nozzle and contact tip from gun.
• Lay cable out straight - blow out gently into gun end
with compressed air. Bend cable back and forth –
blow out again – Repeat until clean.
Excessive pressure at start may cause the dirt to
form a plug.
PERIODICALLY AS REQUIRED
• Blow dirt out of the welder with low pressure air to
eliminate excessive dirt and dust buildup that could
cause welder to run hot.
• Blow dirt out of: Rectifier & Fan Motor Assembly;
PC Board located on Case Side Assembly; and
Center Assembly components.
• Vacuum accumulated dirt from gearbox and wire
feed section.
• Inspect the incoming guide tube and clean inside
diameter if necessary. Replace when excessively
worn.
• Replace Contact Tip – when hole is enlarged or
elongated (refer to “ CHANGING THE CONTACT
TIP ” , in this section).
• Replace gas nozzle.
• Replace Liner – when wire feeding problems occur
and other items have been checked (refer to
“ CHANGING LINER ” procedure in this section).
• Replace internal gun handle parts as necessary
(see Procedure at the end of this section).
WARNING
SP-175 PLUS