Graco Inc 801-643 manual Pump Refer to Parts Drawing, Page, Valves, Replace valve unit with P/N

Pump (Refer to Parts Drawing, 'Page 9)

NOTE: Two sizesof metric wrenchesare necessary for servicing the pump; M13 and M30.

Valves:

1.Remove the hex plug (5)from manifold (6) usingM30 wrench.

2.Examine O-ring (4)under plug.and replace if cutsor distortion exist.

3.Remove valve unit and O-ring (3) from cavity NOTE: Valve unit maycomeapartduringremoval.

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

5.Replace hex plug and torque 75ft. Ibs. (1 0.3 K/m). NOTE: Hex plug shouldbere-torqued.after5

hours operation.

. .

Pumping Section:

1.Remove the eight cap screws(I)from the manifold using the M13 wrench.

2.Carefully separate the manifold from thecrankcase.

NOTE: It may be necessary to tap manifold lightly with mallet to loosen.

plungerswhenremoving to avoiddamageto nlungers or seals.

3.Carefully examine each plunger(16)for any scoring and replace if necessary.

ServicingPlungers:

1.Loosen plunger retaining screw(l2)5-6turns,using "10 wrench.Pushplungertowardscrankcase.

Ttiis will separate plunger and retaining screw.

2.Remove retaining screw from plunger andexamine O-ring (18). back-up ring (17). and copper bearing/gasketwasher(13).Replaceifnecessary using plunger repair kit P/N 801-474.

3.Removeplunger fromplunger rod and remove copper flinger (15). Clean or replace if necessary.

4.Lightly grease flinger and replaceit on plunger rod.

5 . Replace plunger

6.Lightlygreaseretainingscrewassembly to avoid cutting O-ring. Lightly grease outer end of plunger.

7.Installretainingscrewassemblyintoplungerand torque to 14.4ft. Ibs. (2 K/m).

8.Lubricate each plunger and carefully slide manifold onto crankcase.

9.Replace the eightcapscrewsand snugthemup. Torque to 21.7 ft. Ibs. (3 K/m).

NOTE: The eightcapscrews must betorqued evenlyto apply equalpressure onthe manifold so that it seatsproperlyand doesn't bind or jam. This is best done by torquing bolts closest to the center of the manifoid first and then working out from those bolts.

Servicing V-Packings:

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

1 . Afterremovingtheeightcapscrews.andthe manifold carefully pull packingretainer(l9)from the

manifoldExamineO.-ring (10) and replace if necessary.

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

3.Pull intermediateretainerring (20)from manifold. Remove long life ring (9).high pressure packing (8) and head ring (7).

4.Inspect all parts and replace if necessary

NOTE: If just the packings are needed use kit801-

486.If rings or retainers need replacement use kit 801 -487.

5.Thoroughly clean packing cavity in manifold and examine. Lightly grease packing cavity.

6.Replace packingassembly in thefollowing order:

headring (7). packing (8).long lifering (9). intermediatering (20). head ring (7). packing(8). packing retainer (19).and O-ring (10).

CAUTION

Carefully study the location of each part and the position of the seals to assure proper reassembly and operation.

7.Lubricate each plunger and carefully slide manifold onto crankcase:

NOTE: When replacingthe manifoldonto plungers,extremecautionshouldbe exercised to avoid damage to the seals.

8.Replace theeightcapscrews in themanifold and

tighten as previouslydescribed(step 9 under servicingplungers).

8801-643