Lincoln Electric IM723-A - Manual (Page 15)

D-1 MAINTENANCE D-1
PUMP
The pump head has a "built in" strainer on the inlet
side of the pump. It is recommended to clean or
replace the pump’s inlet strainer at least annually
as follows:
• Drain the coolant reservoir and all coolant lines.
Dispose of the coolant properly as specified above.
• Hold the pump head firmly to apply a counter-torque
when loosing the strainers 7/8" acorn nut located on
the bottom. Do not confuse with 3/4" acorn nut.
Remove nut and slide inlet strainer down and out
from the pump head.
• Gently rinse the strainer under running water to
thoroughly clean it.
• Use a mirror to inspect the inside of the pump for
contamination. Carefully remove hardened debris
with a dental pick if necessary, without scratching
the inside of the pump.
• Reinstall the strainer and 7/8 acorn nut, tighten to 75
in-lbs.(8.5N-m) of torque. Wipe dry all area wetted
with coolant. Dispose of coolant soaked towels
properly as specified above.
PUMP MOTOR
The Under-Cooler cart is rated for continuous
operation. It is recommended to re-oil the pump
motor bearings once a year as follows:
• Remove the plastic plugs located on the top of both
the inboard and outboard bearing end-caps.
• Re-oil each bearing with 30-35 drops of SAE 20 oil
then reinstall both plugs.
HEAT EXCHANGER
To maintain maximum cooler efficiency, the heat
exchanger should be kept free of dust and dirt build-
up. Clean the heat exchanger periodically using a
vacuum hose or a low-pressure air line. Avoid placing
the unit near a flux hopper or a flux waste container.
A clean heat exchanger offers better cooling perfor-
mance and longer product life. In extremely dirty
environments, it may be necessary to remove the
heat exchanger completely from the cooler and clean
the fins with soap and water. Use care to avoid
damaging the fins.
UNDER-COOLER CART
SAFETY PRECAUTIONS
Have qualified personnel do the maintenance
work. In some cases, it may be necessary to
remove safety guards to perform required
maintenance. Remove guards only when
necessary and replace them when the mainte-
nance requiring their removal is complete.
Always use the greatest care when working near
moving parts.
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ELECTRIC SHOCK can kill.
• Do not touch electrically live parts or
electrode with skin or wet clothing.
• Insulate yourself from work and
ground
• Always wear dry insulating gloves.
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MOVING PARTS can injure.
• Do not operate with doors open or
guards off.
• Keep away from moving parts.
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Observe all Safety Guidelines detailed throughout
this manual. Be sure to disconnect the Under-
Cooler cart from the Power Source before
performing any maintenance procedures.
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ROUTINE
Remove accumulated dust and dirt from the internal
components of the cooler by blowing it out with a low-
pressure air hose or removing it with a vacuum hose.
PERIODIC
In dirty or dusty environments or if biological growth
occurs in the coolant, it may be necessary to flush the
coolant reservoir. Dump the old coolant, rinse the
inside of the reservoir and circulate rinsing solution
through coolant system. Add new coolant when
cleaning is finished. It is recommended to flush the
coolant at least once a year. A cooling system free
from debris offers increased cooling efficiency and
longer pump and torch life. See the coolant treatment
recommendation in “Section D-2”.
NOTE: Pure solutions and mixtures of, or materials
(i.e. towels) wetted with ethylene glycol are toxic to
humans and animals. They must not be haphazardly
discarded, especially by pouring liquids down the
drain. Contact the local EPA office for responsible
disposal methods or for recycling information.
WARNING