Service - Graco D Series Instructions Manual

Needle, Seat, and Packings
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
1. Relieve the pressure.
2. Remove the spray tip and flush the gun with a
compatible solvent.
3. Disconnect the fluid hose(s).
4. Screw the locknut (3) off the head (18) and align
the slot in the air piston (13) with the slot in the
gun body (14). Swing the head out of the gun body
and slide the needle out of the socket in the air
piston.
5. Screw the packing nut (7) out and remove the
packings (16 and 24), gland (15), and needle (22).
6. Remove the tip and seat (23) out of the housing.
See Fig. 2.
7. Handle the needle and seat carefully and inspect
them closely for wear or damage.
8. Reassemble the gun using new parts as neces-
sary. Soak a new leather packing in light, compat-
ible oil before installing it.
12
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Service

Air Piston, Spring, and Seals
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
1. Relieve the pressure.
2. Remove the gun head as explained in the Needle,
Seat, and Packings section.
3. Remove the air cylinder cap (10), take out the
spring (11), and pull the piston (13) out.
4. Clean and inspect all parts. Check the piston
o-rings (4 and 5) carefully.
5. Lubricate all parts with a light waterproof grease
and reassemble the gun using new parts as nec-
essary.
Packing Configurations
The standard packings are two UHMWPE packings
(Part No. 181523) and one leather packing (Part No.
166258). If your usage requires different packings,
refer to the following chart of available packing configu-
rations.
Model
No.
206660 and
901410
WARNING
Leather UHMWPE
Packings Packings
(3) 166258 (2) 181523
leather UHMWPE
and (1)
166258
leather
(standard)
PTFE
Packings
(3) 168296
PTFE