Hydraulic Pump; Motor Mounts - Graco GH 733 HYDRA-SPRAY Instructions-Parts List Manual

Hydraulic Pump
WARNING
.
I
The hydraulic pump and the pressure control knob
are sold as a complete assembly only. Do not at-
tempt to service these parts yourself. Send them
to an authorized Graco service center for replace-
I
ment or repair.
I
I C A U T 1 O N 1
Cleanliness is essential when repairing hydraulic
systems. Use special care t o avoid getting dust or
dirt into the pump during servicing.
~~ ~~~ ~~~~~
Unscrew the swivel (76). point the bypass valve (78)
down into a waste container and open the bypass valve
to drain the reservoir (121. Refer to Fig 10.
the hydraulic motor
(89).
Be careful not
to
turn
the
Disconnect the hose
(881
between the cooler (47) and
elbow
(431.
Loosen the hose clamp (49) nearest to the
cooler on the short section of hose (51 that is located
between the reservoir and the cooler. See Fig 10.
to the. fan shield
(521.
Remove the cooler. Remove the
Remove the six screws
(2)
holding the cooler assembly
fan.
Unscrew the hose coupling stud ( 6 0 ) to disconnect the
suction hose ( 5 9 ) between the reservoir and the
hydraulic pump.
from the elbow
(681
and disconnect the pressure hose
Disconnect the case drain hose (55) coupling stud (671
( 8 4 )
from the tee (75) in the outlet of the hydraulic pump
1 6 9 ) .
flange (64). Remove plate
(631.
loosen the setscrew on
Remove the two screws (711 from the pump
( 6 9 1
and
the coupling ( 6 6 ) and pull the pump ( 6 9 ) out.
~~~
installing the fan (50). slide
it
about 1 in. (25 mml onto
Reassemble ,in the reverse order
of
disassembly. When
the pump
(691
shaft and tighten the setscrews.
NOTE:
Whenever the reservoir cover (10) is remov-
ed, put silicone sealant on the threads of the
screws
(2)
when reassembling the cover.
CAUTION
The alignment of the engine mounting flange
(641
to the engine and the alignment of the coupler
(661
which connects the hydraulic pump 1691 shaft
and the engine shaft are critical. If the coupler has
failed, Graco recommends that you contact your
~
nearest factory branch or the Graco Service
Department for detailed service information.
Cooler
Special care must be used if the return tube 1139). the
9 o o
elbow (43) or the hose ( 8 8 ) leading into the elbow
are removed from the cooler (47). The return tube and
elbow each connects to a hex-shaped male adapter (K)
which is part of the cooler core assembly. See Fig 10.
The adapter is made of aluminum and can be easily
damaged. So, whenever you are working on these
adapter. Remove and replace the necessary cooler parts
parts, hold a wrench stationary on the hex of the male
as instructed in paragraphs
2
and 3 of the Hydraulic
Pump section (column 1
).
Reassemble the cooler in the
elbow, use a liquid sealant on the threads and screw the
reverse order of disassembly. When installing the
elbow~onto the adapter by hand. Tighten the nuts (L).
Refer to Fig 10.
Motor Mounts
If the motor mounts (32) must be replaced, be careful to
install them correctly and evenly. The nut (30) must be
screwed onto the capscrew (31) so the first thread of
the screw is just flush with the top of the nut. Refer to
the Parts Drawing, page 14.