Displacement Pump - Graco 235-699 Instructions Manual

DISPLACEMENT PUMP
WARNING
To reduce the risk of serious injury, follow the
Pressure Relief Procedure Warning on page 19
before doing this procedure. Unplug the sprayer1
NOTE 1: Packing Repair Kit 235-703 is available.
kit
are marked with
an
asterisk, Le., (121*).
Reference numbers of parts included in the
the
kt,
even if the old ones still look good.
For the best results, use all the new parts In
NOTE
2
To minimize down time, and for the best
sprayer performance, check the motor
brushes (see page
20)
and clean the trans-
ducer (see page 27) whenever you repack
the pump. Replace these parts
as
needed.
Intake valve repalr (See Fig
19)
1. Unscrew the intake valve (118). Remove the
O-ring (119*), ball guide
(IZO),
stop pin (122*)
and bail (121*) from the valve.
2.
Clean and inspect the parts for wear or damage.
Replace parts as needed. Use a new O-ring
(1 19*). If no further service Is needed, reassemble
the pump.
NOTE 3: For additional pump repair, go to page
2 2 .
Removing the pump (See Fig 19)
1.
Flush the pump,
If
possible. Relieve pressure.
Stop the pump with the piston rod (107) In Its low-
est position, If possible. To lower the piston rod
manually, rotate the motor fan blades.
2.
Remove the filter (85).
3. While pulling upward on the suction hose (32),
unscrew the hose from the inlet tube (38). Un-
screw the drain hose (33) from the displacement
pump nipple (36).
NOTE 4 If repairing only the intake valve assembly,
go to Intake valve repair, below.
4. Use a screwdriver to push the retaining spring
(18) up and push out the pin (17).
5.
Loosen the screws (21). Remove the pump
(20).
Installing the pump (See Fig 19 and 20)
1. Mount the pump on the drive housing. Tap
it
Into
the alignment pins with a soft hammer. Tighten
the screws (21) to
50
ft-lb (68 N.m).
2. Align the hole in the rod (107) with the Connecting
rod assembly (15). Use a screwdriver to push the
retaining spring (18) up and push in the pin (17).
the connecting rod.
Push the retaining spring (18) into place around
I
17
15
123
18
Fig
20
WARNING
groove all theway around, to preventthe pin (17)
Be sure the retalnlng spring (1 8) Is firmly In the
from working loose due to vibration. See Fig
20.
If the pin works loose,
It
or other parts could break
offduetotheforceofthepumpaction. These
parts could be projected into the air and result
in
serious Injury or property damage, lncludingthe
pump connecting rod or bearing housing.
3. Replace the O-ring
(27) if it is
wom or damaged.
Reconnect the suction and drain hoses (32,33).
Install the front cover (13).
leakage, but no tighter. Fill the packing nut/wet-
cup 1/3 full with Graco TSL. Push the plug (123)
Into the wet-cup.
4.
Tighten the packing nut (102) just enough to stop
308-248
21