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Replacing the Hydraulic Pump
1.
Follow the Pressure Relief Procedure Warning
on page 8. Let the hydraulic system cool before
beginning the service procedure.
2. Unscrew the reservoir drain
plug (7), having a con-
tainer ready
to
catch the draining fluid.
3.
Disconnect the hydraulic inlet hose
(92)
from the 90°
swivel
union
(45)
at the motor and from the tee (54).
4. Disconnect the bypass
hose
(85)
from the ball valve
(84).
5.
Remove the four nuts
(27)
from the seal plate
(160)
on the reservoir cover (90).
6.
Remove the
two
screws (8), lockwashers
(11)
and
washers (98)
holding the hydraulic pump (70).
7.
Pull the pump away and loosen the setscrews (38a)
on the pump half
of
the coupler (38).
8.
Raise
the pump and turn
it
to
unthread the inlet
filter
(21)
which
is
in the oil reservoir.
90
9.
Be
sure the new hydraulic pump
has
the same part
number
as
the old one. Check the numbers
stamped on the pumps
to
verify them.
10.
Remove all fittings from the old pump and install
them on the new pump in the same order.
11.
Install the new pump, being sure
to
connect the in-
let filter
(21)
to
the bottom
of
the pump.
12.
Check Dimension A
as
shown in
Fig
15.
When the
dimension is correct, tighten the setscrews (38a).
r-------CAUTION
------.,
The correct coupling dimension
is
critical
to
avoid
improper
coupler engagement
to
the coupler
spider which will damage the coupler and make
the sprayer
inoperable.
13.
Reconnect the hoses. Reinstall the reservoir plug
(7),
and refill the reservoir with clean, Graco-
approved
hydraulic oil.
76
65
Fig
14
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14
307-293