Graco A Series Instructions-Parts List Manual page 15

. .
SERVICE
Pump
(Refer t o Parts Drawing, Page 16)
NOTE:
Two sizes of metric wrenches are
necessary for servicing the pump: M13
and M30.
Valves:
1.
Remove the hex plug (226) from manifold (223)
using
M30 wrench.
2.
Examine O-ring (225) under plug and replace if
cuts or distortion exist.
3.
Remove 'valve unit (224) and O-ring (225) from
cavity.
.
,
,NOTE:
Valve unit may come .apart during
removal.
4. Replace valve units with valve unit kit, P/N 801
-
472.
f
5. Replace hex plug and torque to 75 ft. Ibs. (10.3
K/m).
NOTE: Hex plug should be re-torqued after 5
hours operation.
Pumping Section:
1. Remove the eight cap screws (221) from the
manifold using the M13 wrench.
2.
Carefully separate the manifold from the
crankcase.
NOTE:
It may be necessary
to
tap manifold
lightly with mallet to
loosen.
r-
plungers when removing
c A u T ' O
to avoid damage t o
Keep manifold properly aligned with ceramic
plungers or seals.
3.
Carefully examine each plunger (211) for any
scoring and replace if necessary.
Servicing Plungers:
1. Loosen plunger retaining screw (207) 5-6 turns,
using "10 wrench. Push plunger towards
crankcase. This will separate plunger and
retaining screw.
2. Remove retaining screw from plunger and
examine O-ring (209). back-up ring (210). and
copper bearing/gasket washer (208). Replace if
necessary using plunger repair kit P/N 801-474.
3.
Remove plunger from plunger rod and remove
copper flinger (21 2). Clean or replace if necessary.
4.
Lightlygreaseflingerandrepla'ceitonplungerrod.
5. Replace plunger
6. Lightly grease retaining screw assembly to avoid
cutting O-ring. Lightly grease outer end
of plunger.
7. Install retaining screw assembly into plunger and
torque to 14.4 ft. Ibs. (2 K/m).
8. Lubricate each plunger and carefully slide
manifold onto crankcase.
9.
Replace the eight capscrews and snug them up.
Torque to 21.7 ft. Ibs. (3 K/m).
NOTE: The eight capscrews must be torqued
evenly to apply equal pressure on the
doesn't bind or jam. This is best done by
manifold so that
it
seats properly and
torquing bolts closest to the center of the
manifold first and then working outfrom
those bolts.
Servicing V-Packings:
NOTE:
Use packing repair kit P/N 801-486.
1 , After removing the eight capscrews and the
the manifold. Examine O-ring (206) and replace if
manifoldcarefully pull packing retainer (205)frorn
necessary.
2. Remove low pressure packing (202)and head ring
(201
).
3. Pull intermediate retainer ring (204) from
pressure packing and head ring (201).
manifold. Remove long life ring (203) high
4. Inspect
all
parts and replace if necessary
NOTE:
If just the packings are needed use kit
801-486. If ridgs or retainers need
replacement use kit 801 -487.
5. Thoroughly clean packing cavity in manifold and
examine. Lightly grease packing cavity.
6.
Replace packing assembly
in the following order:
head ring (201). packing (202). long life ring
packing (202). packing retainer (205). and O-ring
(203),intermediate ring (204). head ring (201).
(206).
Carefullvstudvthelocationofeachpartandthe
CAUTION
position. of .the seals to assure proper
reassembly and operation.
Lubricate each plunger and carefully slide
manifold onto crankcase.
NOTE:
When replacing the manifold onto
plungers, extreme caution should be
exercised to avoid damage to the seals.
Replace the eight capscrews in the manifold and
tighten as previously described (step
9
under
Servicing Plungers).
803-010
15