Graco A Series Instructions Manual page 10

Spring Operated Regulators
Disassembly
1. Shut off the pump. Close the ball valve at the
regulator's fluid inlet. Refer to Fig. 1, page 5.
2. Release all fluid pressure in the regulator and
disconnect the fluid line. Remove the regulator
from the system.
3. Turn the adjustment handle (1) counterclockwise
until the spring force is relieved (Fig. 3).
4. Remove the eight hex head screws (18) and nuts
(19) from the regulator cap (5) and the housing (20).
See Fig. 5.
5. Remove the spring (8), spring guide (7), and o-ring
(6*) from the regulator cap (5). Remove the jam
nut (9) and the washer (10) from the diaphragm
plate (13).
6. Remove the diaphragm (11*) and the gasket (12). 6. Remove the diaphragm (11*) and the gasket (12).
Remove the valve seat (14*) and o-ring (15*) from Remove the valve seat (14*) and o-ring (15*) from
the regulator body.
CAUTION
Use special care when handling the hard carbide ball Use special care when handling the hard carbide ball Use special care when handling the hard carbide ball Use special care when handling the hard carbide ball
(16*) and seat (14*) to avoid damage to them. (16*) and seat (14*) to avoid damage to them. (16*) and seat (14*) to avoid damage to them. (16*) and seat (14*) to avoid damage to them.
7. Remove the ball (16*) and spring (17*). 7. Remove the ball (16*) and spring (17*). 7. Remove the ball (16*) and spring (17*). 7. Remove the ball (16*) and spring (17*).
8. Thoroughly clean and inspect all parts. Replace 8. Thoroughly clean and inspect all parts. Replace 8. Thoroughly clean and inspect all parts. Replace 8. Thoroughly clean and inspect all parts. Replace
any parts that appear to be worn or damaged. any parts that appear to be worn or damaged.
10 308325
Service
Reassembly
1. Place the spring (17*) into the housing (20), then
the ball (16*) on top of the spring.
Use special care when tightening the seat (14).
Tighten it by hand several turns before using a
wrench. Use care not to strip the plastic threads in
the housing (20).
2. Tighten the seat (14*) and the o-ring (15*) into the
housing. Torque to 37–43 in–lbs (4.1–4.8 N.m).
3. Assemble the following parts onto the diaphragm 3. Assemble the following parts onto the diaphragm
plate (13). First, place the gasket (12*) and plate (13). First, place the gasket (12*) and
diaphragm (11*), with the blue PTFE side facing diaphragm (11*), with the blue PTFE side facing
down, towards the diaphragm plate (13). Then, down, towards the diaphragm plate (13). Then,
place the washer (10), with ridges facing the place the washer (10), with ridges facing the
rubber side of the diaphragm, onto the diaphragm rubber side of the diaphragm, onto the diaphragm
plate (13). Secure them with the jam nut (9). plate (13). Secure them with the jam nut (9).
Torque the jam nut onto the diaphragm plate to Torque the jam nut onto the diaphragm plate to
28–32 ft–lb (38–43 N.m). 28–32 ft–lb (38–43 N.m). 28–32 ft–lb (38–43 N.m).
4. Install the assembled parts in the housing (20), 4. Install the assembled parts in the housing (20), 4. Install the assembled parts in the housing (20),
with the stem on the diaphragm plate (13) oriented with the stem on the diaphragm plate (13) oriented with the stem on the diaphragm plate (13) oriented
towards the seat (14*). towards the seat (14*). towards the seat (14*).
5. Coat the outer surfaces of the spring (8) with no. 2 5. Coat the outer surfaces of the spring (8) with no. 2 5. Coat the outer surfaces of the spring (8) with no. 2 5. Coat the outer surfaces of the spring (8) with no. 2 5. Coat the outer surfaces of the spring (8) with no. 2
lithium base grease to reduce possible friction. lithium base grease to reduce possible friction. lithium base grease to reduce possible friction. lithium base grease to reduce possible friction. lithium base grease to reduce possible friction.
6. Place the spring (8) on top of the jam nut (9) and 6. Place the spring (8) on top of the jam nut (9) and 6. Place the spring (8) on top of the jam nut (9) and 6. Place the spring (8) on top of the jam nut (9) and 6. Place the spring (8) on top of the jam nut (9) and
the spring guide (7) on top of the other end of the the spring guide (7) on top of the other end of the the spring guide (7) on top of the other end of the
spring. Apply no.2 lithium base grease in the drill spring. Apply no.2 lithium base grease in the drill spring. Apply no.2 lithium base grease in the drill spring. Apply no.2 lithium base grease in the drill
point of the spring guide for lubrication. point of the spring guide for lubrication. point of the spring guide for lubrication. point of the spring guide for lubrication. point of the spring guide for lubrication.
7. Place the hex head screws (18) into the eight 7. Place the hex head screws (18) into the eight 7. Place the hex head screws (18) into the eight 7. Place the hex head screws (18) into the eight 7. Place the hex head screws (18) into the eight
holes in the cap (5) and install onto the housing holes in the cap (5) and install onto the housing holes in the cap (5) and install onto the housing holes in the cap (5) and install onto the housing
(20) with the nuts (19) located around the housing (20) with the nuts (19) located around the housing (20) with the nuts (19) located around the housing (20) with the nuts (19) located around the housing
holes. Torque the eight hex head screws in the holes. Torque the eight hex head screws in the holes. Torque the eight hex head screws in the holes. Torque the eight hex head screws in the
sequence shown on the Top View in Fig. 5. sequence shown on the Top View in Fig. 5. sequence shown on the Top View in Fig. 5.
8. Screw the adjustment handle (1) into the nut (4) in 8. Screw the adjustment handle (1) into the nut (4) in
the regulator cap (5).
CAUTION