Graco Inc. EM390 User Manual download pdf (Page 19)

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DISPLACEMENT PUMP

Reassembly Procedure

1. Stack

these parts one

at a time onto the piston valve

(224): backup washer (219*), U–cup seal (205*)

lips

down

and female gland (220*), alternate the polyeth

ylene

and leather v–packings

(217*, 208*)

lips up,

and

then

the male gland (213*). See Fig 19–1.

NOTE

AND MAINT

AIN

THIS ALIGNMENT

THROUGHOUT STEPS

2, 3 and 4

Fig

19–2

TORQUE

NUT T

3–4 in-lb

(0.34–0.35 N.m)

APPLY ONE DROP

OF SEALANT T

THESE THREADS

203*

224

214

0082

2. Tighten the packing retaining nut (214) against the

gland

(213) and torque to

3–4 in–lb (0.34 – 0.35 N.m).

See

Fig 19–2.

NOTE: NOTE THE ALIGNMENT of the piston (224) to

the nut (214). Maintain this alignment through-

out

Steps 2, 3 and 4.

3. Apply

1 drop only

of sealant, supplied with the repair

kit, to the piston valve threads. Place the small ball

(203*) on the valve. See Fig 19–2. Hand tighten the

valve

into

the rod (223) just until the nut contacts the

rod. Place the flats of the displacement rod in a vise.

Fig

19–3

214

TORQUE

NUT AGAINST ROD

O 19 ft-lb (25 N.m)

223

DO NOT ALLOW THIS

NUT T

O MOVE RELA

TIVE

O THE PIST

ON (224)

WHEN INST

ALLING

PISTON ONTO ROD

0083

4. Torque

the nut (214) against the rod (223) to 19 ft–lb

(25 N.m). Use two wrenches to maintain the align-

ment as mentioned in the NOTE above. See Fig

19–3.

5. Stack

these parts one

at a time into the top of the cyl

inder (216): male gland (21

1*),

alternate the polyeth

ylene

and leather v–packings (218*, 209*)

lips down,

and

then the female gland (212*). See Fig 19–1.

Loosely install the packing nut (221) and plug (201).

7. Insert

the oiled piston rod (223) through the bottom of

the

cylinder

8. Assemble

the intake valve. Use a new gasket (206*).

Screw

the intake

valve into the cylinder and tighten to

ft–lb (107 N.m). See Fig 19–1.

9. Screw

down the cylinder locknut (1

12) until it is finger

tight at the bottom of the external cylinder threads.

See

Fig 19–1.

10. Install the displacement pump on the sprayer. See

page18.

LEATHER

Lips

must

face up

*208

216

Fig

19–1

201

223

*204

215

222

206*

207*

POLY

Lips

must

face up

217*

POLY

Lips must

face down

218*

LEATHER

Lips must

face

down

*209

224

Lips

of seal

must face

down

205*

203*

*212

TORQUE TO

80 ft–lb

(107 N.m)

221

112

214

*211

*219

*220

*213

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Graco Inc. EM390 User Manual Page 19

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