Ransburg EFM & EFMD Solvent Applicator 76480, 76482, 76485, 76488 - Manual (Page 29)

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EFM(D) Solventborne Robotic Atomizers - Maintenance
4. Inspect metal rear needle [9] for excessive
wear. If wear is observed (longitudinal grooves or
a noticeable reduction in diameter), replace the
needle. Whenever replacing rear needle section,
you must also replace the seal [14] at the same
time. Upon reassembly, apply Loctite Locquip
Primer Grade T #747-56 and Loctite #290 Medium
Strength (green) to the end of rear needle and ID
of piston rod [8] before assembling into piston rod.
5. Place the rear needle assembly back into the
spray head. Push on the piston until the assembly
is firmly seated in the spray head.
Rear Needle Replacement Rear Needle Replacement Rear Needle Replacement Rear Needle Replacement Rear Needle Replacement
(See Figure 5) (See Figure 5) (See Figure 5) (See Figure 5) (See Figure 5)
1. Remove the air cap, fluid tip and the fluid nozzle
as described in Steps 1 through 8 of the "Fluid Tip,
Nozzle, and Front Needle Replacement" in the
"Maintenance" section.
2. Remove metal rear needle [9], piston rod [8],
piston seal [6], piston [5], and piston nut [4] as an
as an as an as an as an
assembly assembly assembly assembly assembly. Pull the assembly out from the rear of
the spray head.
3. Piston [5] and piston seal [6] can be removed
from the piston rod by unscrewing piston nut [4]. If
replacing piston seal [6], press flat side of seal
down onto piston. Apply a thin film of petroleum
jelly to outside of seal.
> Fluid seal [14], seal washer [13], and seal
spring [12], will come free at this point. Place
hand over end as not to drop parts.
C A U T I O N C A U T I O N C A U T I O N C A U T I O N C A U T I O N
!!!!!
N O T E N O T E N O T E N O T E N O T E
> Damage will occur to the piston seal
if removed. If removed, replace piston
seal.
> Do not remove the metal rear needle
from the rod unless it is damaged and
must be replaced.
6. Place seal spring [12] over the rear needle in
the front end of the spray head. Hold the spray
head upward as the spring will want to fall out.
7. Still holding the spray head upward, place o-
ring [11] into its seat and seal washer [13] and fluid
seal [14] onto the rear needle. The tapered end of
the fluid seal should be pointed toward the front of
the applicator.
8. Reassemble fluid nozzle [15] by pushing the
nozzle into the spray head until the threads
engage. Screw the nozzle into the spray head.
Torque to 23-25 lbs•in. Plastic threads damage
easily; do not over-tighten. Note the front flange of
the fluid nozzle will not seat flush against the spray
head.
9. Apply Loctite #222 Low Strength (purple)
Threadlocker into the threads of plastic front
needle [16] before assembling onto the rear needle.
Be sure that the rear needle assembly is pushed
all the way forward before threading on front
needle.
10. Reassemble fluid tip [18]. Hand tighten first;
then with a small wrench turn an additional 30
degrees. Place air cap clip [19] into groove in the
fluid tip.
11. Reassemble air cap [20] and air cap retainer
[21]. Do not let air cap rotate while loosening or
tightening.
12. Apply a thin film of petroleum jelly to piston
spring [3]. Install piston spring, and spring retainer
[2]. Screw piston cap [1] back on.
13. Lubricate all of the o-rings on the underside of
the spray head with petroleum jelly, and apply a
thin coat of dielectric grease EPS-4109 (syringe)
to the grooves of the spray head and the valve
manifold before reassembly.
14. Refer to Figure 6b and replace spray head
assembly [1] back onto applicator housing
assembly [2]. Screw four socket head cap
screws [5] back into place. Do not overtighten
nylon screws, as they can break.