12
308-360
Service
Required Tools
Set of adjustable wrenches
Large pipe wrench
Torque wrench
Rubber mallet
O-ring pick
Large vise
Thread lubricant
Thread sealant
Disconnecting the Displacement Pump
1.
Flush the pump, if possible. Stop the pump at the
bottom of its stroke.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
2.
Relieve the pressure.
3.
Disconnect the air hose and the fluid hose.
4.
Disconnect the displacement pump (109) from the
motor (101) as follows. Note the relative position of
the pump’s fluid outlet (U) to the air inlet (V) of the
motor. If the motor does not require servicing,
leave it attached to its mounting.
CAUTION
Be sure to use
at least two people when lifting, mov-
ing, or disconnecting the pump. This pump is too
heavy for one person. If you are disconnecting the
displacement pump from a motor which is still
mounted (for example, on a wall bracket),
be sure to
support the displacement pump while it is being dis-
connected, to prevent it from falling and causing inju-
ry or property damage. Do this by securely bracing
the pump, or by having at least two people hold it
while another disconnects it.
If the pump is mounted on a cart, slowly tip the cart
backward until the handle rests on the ground, then
disconnect the displacement pump.
5.
Using an adjustable wrench (or hammer and
punch), unscrew the coupling nut (106) from the
motor shaft (W). Do not lose or drop the coupling
collars (107). See Fig. 4.
6.
Hold the tie rod flats with a wrench to keep the
rods from turning. Unscrew the nuts (108) from the
tie rods (105). Carefully remove the displacement
pump (109) from the motor (101).
7.
Refer to page 14 for displacement pump service.
To service the air motor, refer to the separate mo-
tor manual, supplied.
Reconnecting the Displacement Pump
1.
Make sure the coupling nut (106) and the coupling
collars (107) are in place on the displacement rod
(1). See Fig. 4.
2.
Use at least two people to hold the displacement
pump while another reconnects it to the motor (see
the CAUTION at left). Orient the pump’s fluid out-
let (U) to the air inlet (V) as was noted in step 4
under Disconnecting the Displacement Pump.
Position the displacement pump (109) on the tie
rods (105).
3.
Screw the nuts (108) onto the tie rods (105) and
torque to 81–89 N.m (60–66 ft-lb).
4.
Screw the coupling nut onto the motor shaft (W)
loosely. Hold the motor shaft flats with a wrench to
keep it from turning. Use an adjustable wrench to
tighten the coupling nut. Torque to 196–210 N.m
(145–155 ft-lb).
5.
Reconnect all hoses. Reconnect the ground wire if
it was disconnected. Fill the packing nut (2) 1/3 full
of Graco Throat Seal Liquid or compatible solvent.
6.
Turn on the air supply. Run the pump slowly to en-
sure proper operation.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
7.
Before returning the pump to production, relieve
the pressure and retorque the packing nut (2) to
136–149 N.m (100–110 ft-lb).
