Graco 307812A HYDRAULIC PUMP REPAIR KIT 220644 Owner's Manual

INSTRUCTIONS-PARTS LIST
307-812
ORACO
Rev A
This manual contains IMPORTANT
WARNINGS end INSTRUCTIONS
READ AND RETAIN FOR REFERENCE
HYDRAULIC PUMP REPAIR
KIT 220-644
For use in GH 433 Sprayers. Series A to F only. Replaces the
hydraulic pump, Pan No. 174". and the flexible coupling,
Part No. 1WnS.
PARTS LIST
Includes items A, E, C (See Fig 2)
REF PART
NO. NO.
108-707
A.
E.
C.
.
OM
DESCRIPTION
WARRANTY INFORMATION NOTE: This productis
covered by a written warranty and disclaimers. Consult your
Graco equipment catalogfor text. A copy of the warranty and
disclaimers may be obtained
from your locai Gracodistributor,
by calling(61216236822 or by writing to the address below.
1
4
hydraulic
PUMP,
1ooM)4
CAPSCREW. hex head
105794
COUPLING. flexible
Includes 2 k
m IC?)
1
Pressure Rellef Procedure
To reduce the risk of serious bodily injurv. includingfluid injection. splashing in the eyes or on the skin. or injurv from moving
always follow this procedure whenever you
shut off the sprayer, when checking or servicing part
anyof thespray system,
when installing, cleaning or changing spray tips, and whenever you stop spraying.
I1 I Engage the gun safety latch.(2) Open the
bypass velve. (3) Depressthe engine stopbutton. (4) Close the fuelshutoff valve. (5) Disengage the gun safety latch and
hold a
metal pert of thegun firmly to the side of a grounded metal pail, and trigger the gunto relieve pressure. (6) Engage the gun
safety latch. (7)Open the drain valve, having
a container readyto catch the drainage.16) Leave the drain valva open
until you a?
ready to spray again.
parts.
I? you suspect that the spray tip or hose is completely dogged,or that pressure has not been fully relieved after following the
stepsabove, VERY SLOWLYloosenthe tip guard retainingnut or hose end coupling and relieve
presslre gradually, then loosen
completely. Now clear the tip or hose.
NOTE: Thereferencenumbers
in parentheses inthe text
and on the drawings correspond to the reference
numbers in the drawings and on the parts list of
your GH 433 Sprayer manuai,
307-293.
I
1
92
Be sure to prevent contaminating the hydraulic system
by keeping the work area clean. Lay
perts on a clean
cloth or paper when disassembling.
c
A
U
T
l
o
N
Some
hydraulic
fluid will leek.
prepared
Be
any spills to avoid slipping or falling.
to clean
up
@ -9
I
V
1. Follow the Preeeun Rellef Procedure Warning on the
front cover. Let the hydraulic system cool.
2. Place a container underthe reservoir and removethe drain
plug (71, not shown.
3. Disconnect the hydraulicinlet hose (921 at the tee ( 5 4 1 on
top of the pump 170). DiFonnect the bypasshose (1)
from the ball valve 184).
4. Remove four locknut8(1471from the suction flange(1571,
above the reservoir. See Fig 2.
5. Remove the four screws (81and lockwashers 111) holding
the hydraulic pump ,4701 to the cooler housing (601. Puli
the pump forward and use a 5/16 in. Allen* wrench to
loosen the setscrew 13%) in the coupling 138). Remove
the pump.
GRACO INC. P.O. Box 1441 MINNEAPOLIS, MN 55440-1444
@COPYRIGHT 1986. GRACO INC.
NOTE: A complete,flexiblecoupling
(C) is supplied. You
should replace both halves, as couplings do wear
out. However, if you are confident that the engine
half is in good condition, you may replacejust the
pump half. In that case, skip ahead to Step 10.
6. Loosen the couplingnut of the elbow(41) and disconnect
the hydraulic drain hose (2). Remove the fan guard (761
and screw(17). oil cooler 169). cooler retaining screw( 4 0 1
andclamp (681. Loosenthecoolerdrainconnector
nut
(42). Pull the cooler up, out of the housing.
I
CAUTION
Thecorrectcouplingdimension
is critical.Improper
engagement of the coupling halves and spider damages
the coupling and makes the sprayer inoperable.
13. Reconnectthehoses.Reinstalltheresewoir
plug (7).
Refill the reservoir with clean, Graco-approved hydraulic
oil, part no. 207.248.
7. Remove the four screws (12) holding the cooler housing
1 8 0 ) to the adapter plate(64). and pull the assembly away.
NOTE: Two bladesin the fan( 7 5 ) are speciallyset to permit
passing an Allen" wrench through them.
8. Loosen thesetscrew l38el in theengine half of the coupling (38). Loosen the two setscrews on the hubof thefan
1 7 5 ) . Pull the fan and coupling away from the engine.
9. Install the fan and tighten the setscrews. Install the new
key, coupling and spider (half of C).
10. Remove all fmings from the old hydraulic pump and install
them on the new one.
11. Reassemble in reverse order. Use the new gcrews (6) in
place of S C W 18) and the oldlockwashers ( 1 1 ) when installing the new pump (A). Install the new key (C1) with
the pump half of the coupling(CI.
12. Set the gap betweenthe two halves of the flexible coupling (C) at 1/32 in. (0.8 mm) and tighten the setscrews
firmly. See Fig 3.
Fig
Fig 2
Factory 6ranchee:Atlanta. Dallas, Detroit, Lo8 Anpelea, West Caldwell IN.J.1
Subsidlary end Afflllate Cmnpsnles:C.nada; England; Switzerland: France; Germany: Hong Konp; Japan
GRACO INC.
P. 0. Box 1441 MINNEAPOLIS, MN 55440-1444
PRINTED IN U.S.A. 3 0 7 a 2 %E6
@COPYRIGHT 1986. GRACO INC.