Tweco PAK 44G - Manual (Page 29)

Manual 0-2686 23 CUSTOMER/OPERATOR SERVICE
SECTION 5:
CUSTOMER/OPERATOR
SERVICE
5.01 Introduction
This Section describes basic maintenance procedures per-
formable by operating personnel. No other adjustments
or repairs are to be attempted by other than properly
trained personnel.
WARNINGS
Disconnect primary power at the source before dis-
assembling the torch or torch leads.
Frequently review the Important Safety Precau-
tions (page 1). Be sure the operator is equipped with
proper gloves, clothing, eye and ear protection.
Make sure no part of the operator’s body comes into
contact with the workpiece while the torch is acti-
vated.
CAUTION
Sparks from the gouging process can cause dam-
age to coated, painted, and other surfaces such as
glass, plastic and metal.
NOTE
Handle torch leads with care and protect them from
damage.
5.02 General Power Supply
Maintenance
A. Routine Maintenance
NOTE
Refer to Appendix VI for a recommended mainte-
nance schedule for water cooled plasma cutting
systems.
Routine maintenance for the Power Supply should in-
clude an occasional thorough cleaning and inspection. The
frequency depends on the usage and the operating envi-
ronment.
WARNING
Disconnect primary power at the source before as-
sembling or disassembling power supply, torch
parts, or torch and leads assemblies.
Remove the Top Enclosure of the Power Supply and blow
out any accumulated dirt and dust with compressed air.
The unit should also be wiped clean. If necessary, sol-
vents that are recommended for cleaning electrical appa-
ratus may be used.
While the unit is open, inspect the wiring in the unit. Look
for any frayed wires or loose connections that should be
corrected.
Particular attention should be given to the area around
the high frequency spark gap points since accumulated
dirt in that area can weaken the high frequency starting
current.
Parts in the Pak 44G cooling system require routine main-
tenance. The coolant level should be checked daily and
Thermal Arc coolant added to keep the level at the marker
at the bottom of the cylindrical section. If Thermal Arc
coolant is not available, distilled or deionized water may
be used. The resistivity of the water must measure above
0.1 megohm per cm.
CAUTION
Do not use tap water. Its use could cause severe
damage to the torch.
The pump is factory set to operate at 120 psi (8.27 bar)
and should not require adjustment. If adjustment is re-
quired, remove the acorn nut on the top of the pump.
This exposes the adjusting screw. Turn the screw as re-
quired to achieve the 120 psi (8.27 bar). The acorn nut
must be securely fastened before operating to prevent
drawing of air into the system.
WARNING
Do not try to adjust pump with unit running.
B. Coolant Level and Conductivity
1. Coolant Level
The coolant level should be checked every day at
the reservoir filler tube. If the coolant in the filler
tube is below the bottom of the filler tube then