Valley FABRICATOR 251, Руководство по обслуживанию

Страница: 34 / 104

3-12 August 22, 2008
FABRICATOR 251 SERVICE MANUAL
Art # A-07162
Wheel Brake Hex Head Bolt
S pool H u b N u t
Pre ssu re Adj us tme n t
Device
Figu r e 3-12: Wi r e Installed
3.13 Wirefeeder Drive Roller Pressure Adjustment
The r olle r on the swing a r m applies p r essu r e to the g r ooved r olle r via an adjustable tension devise. The Tension
Adjuste r should be set to a minimum p r essu r e that will p r ovide satisfacto r y wi r e feed without slippage. If slipping
occu r s, and inspection of the wi r e out of the MIG gun r eveals no defo r mation o r wea r , the conduit line r should be
checked fo r kinks o r clogging f r om metal flakes. If this is not the cause of slipping, the feed r oll p r essu r e can be
inc r eased by r otating the Tension Adjusting knob clockwise. The use of excessive p r essu r e may cause r apid wea r of
the feed r olle r , moto r shaft and moto r bea r ings.
NOTE
Genuine Valley National Gases contact tips and line r s should be used. Many non-genuine line r s use infe r io r
mate r ials which can cause wi r e feed p r oblems.
3.14 Wire Reel Hub Brake
The wi r e r eel hub inco r po r ates a f r iction b r ake which is adjusted du r ing manufactu r e fo r optimum b r aking. If it is
conside r ed necessa r y, adjustment can be made by tu r ning the hex head bolt inside the open end of the wi r e r eel hub.
Clockwise r otation will tighten the b r ake. (Refe r to Figu r e 3-12 above).
CAUTION
Excessive tension on the b r ake will cause r apid wea r of mechanical wi r e feed pa r ts, ove r heating of elect r ical
component r y and possibly an inc r eased incidence of wi r e bu r nback into the contact tip.
NOTE
Co rr ect adjustment will r esult in the wi r e r eel ci r cumfe r ence continuing no fu r the r than 0.75" (20mm) afte r
r elease of the Gun t r igge r switch. The wi r e should be slack without becoming dislodged f r om the r eel.