Graco Inc. 218-745 - Manual (Page 18)

18
18 307-712
SERVICE
Gun Disassembly
WARNING
Installing and servicing this equipment requires
access to parts which may cause electric shock or
other serious bodily injury if the work is not per-
formed properly. Do not install or service this
equipment unless you are trained and qualified.
Follow the Pressure Relief Procedure Warning,
page 9, before servicing the gun or any part of the
system. Disconnect the fluid hose from the gun.
NOTE: Check all possible remedies in the
Troubleshooting Charts before disassembling
the gun.
CAUTION
If the plastic parts of the gun must be held se-
curely, ALWAYS clamp them in padded vice jaws
to prevent damage to the parts.
ALWAYS lubricate o–rings and seals with petro-
leum jelly.
ALWAYS remove gun from worksite for service or
repair. Service or repair area must be clean.
Flush the gun as described under Flush the Spray Gun.
Follow the Pressure Relief Procedure Warning on
page 9. Disconnect the air and fluid line from the gun.
Gun Assembly Note
Whenever you are tightening plastic parts where there is
no torque specified in the instructions, tighten the parts
finger-tight and then retighten with a wrench 1/4 to 1/2
turn.
Electrode Replacement
1. Remove the air cap assembly and fluid nozzle as de-
scribed in To Clean or Change Air Cap and Fluid
Nozzle.
2. Unscrew and remove the electrode (14) with the
wrench (66c) supplied. See Fig 10. If the needle shaft
assembly (9) turns while trying to loosen the elec-
trode, hold the needle shaft assembly nut with a
small wrench.
3. Install the new electrode (14) with the wrench (66c).
Do not over tighten.
CAUTION
To avoid damaging the plastic threads, be very
careful when installing the electrode.
4. Reinstall fluid nozzle and air cap assembly as
described in To Clean or Change Air Cap and
Fluid Nozzle.
Fig 10
KEY
9 Fluid Needle Shaft Assembly
66c Wrench
66c
9