Graco Inc 801-644, 800-066, 3245 manual Exercised to avoid damage to the seals

SERVICE

pump (Refer to Parts drawing, Page 11)

NOTE:

Twosizes of metric wrenchesare necessary

8. Lubricate each plunger and carefully slide manifold

for servicing the pump; M13 and M30.

onto crankcase.

Valves:

9. Replace theeight capscrewsand

snugthem

up.

1. Removethe hex plug (5)from manifold(6)usingM30

Torque to 21.7 ft. Ibs.

(3Wm).

wrench.

.

.NOTE: The eight capscrews must be torqued

2. Examine O-ring(4)under plug and replaceif cuts or

evenly

to applyequalpressure

on- the

distortion exist.

manifold so that it seatsproperlyand

3. Remove valve unit and O-ring (3)from cavity

doesn't bind or jam. This is best done by

torquing bolts closest to the center of the

NOTE: Valve unit may comeapartduring removal.

manifold first and then working out from

those bolts.

4. Replace valve unit with P/N 801 -472.

Servicing V-Packings:

5. Replace hexplug and torque to75ft. lbs.(10.3Wm).

NOTE Use packing repair kit P/N 801 -486.

NOTE: Hex plug .should be re-torqued after 5

1. After

removing

the

eight capscrewsand

the

.

~hours operation.

! manifoldcarefully pull packing retainer (19)fromthe

manifoldExamineO.-ring

(10) andreplace

if

Pumping Section:

necessary.

1, Remove the eight cap screws (1) from the manifold

2. Remove low pressure packing(8)and head ring (7).

using the M13 wrench.

2. Carefully separatethe manifold from the crankcase.

3. Pull intermediate retainer ring (20) from manifold.

NOTE: It may be necessary to tap manifold lightly

Remove long life ring (9). high pressure packing (8)

and head ring (7).

with mallet to loosen.

4. lnvpecr all partsand replace if necessary.

CAUTION

NOTE: If just the packings are needed usekit 801-

Keep

manifold properlyaligned witli ceramic

plungers whenremoving

to avoiddamage to

486. If rings or retainers need replacement

plungers or seals.

use kit 801-487.

3. Carefully examine each plunger(16 )for anyscoring

5. Thoroughly clean packing cavity in manifold and

and replace if necessary.

examine. Lightly grease packing cavity.

Servicing Plungers:

screw(l.2)5-6turns,using

6 . Replacepackingassembly

in the following order:

1. Loosen plungerretaining

head

ring (7)packing.

(8). long

lifering

(9).

"10

wrench. Pushplungertowardscrankcase.

intermediate ring (20). head ring (7). packing (8).

This will separate plunger and retaining screw.

packing retainer (19). and O-ring (10).

2. Remove retaining screw from plunger and examine

CAUTION

O-ring (18). back-up ring (17),andcopper

Carefully study the location of each part and the

bearing/gasket washer(13). Replace if necessary

position of the seals to assure proper reassembly

using plunger repair kit P/N 801474.

and operation.

3. Remove plunger from plunger rod and remove

7. Lubricate each plunger and carefully slidemanifold

copper flinger (15). Clean or replace if necessary.

onto crankcase.

4. Lightly grease flinger and replace it on plunger rod.

NOTE: When

replacing

the manifold

onto

5. Replace plunger

plungers,extremecautionshould

be

exercised to avoid damage to the seals.

6. Lightly grease retaining screwassembly

to avoid

8. Replace the eightcapscrews

in the manifold and

cutting O-ring. tightly grease outer end ' o f

plunger,

tighten

as previously

described(step

9

under

servicing plungers).

7.Install retaining screw assembly into plungerand torque to 14.4 ft. Ibs. (2 K/m).

10801-644