Graco Dura-Flo 7847, Instructions Manual

Page: 17 / 34

Repair
311828F 17
Repair
Required Tools
• Set of adjustable wrenches
• Large pipe wrench
• 2-5/8 in. wrench
• Torque wrench
• Rubber mallet
• O-ring pick
• Large vise
• Thread lubricant
• Thread sealant
Disconnect the Lower
1. Flush the pump, if possible. Stop the pump at the
bottom of its stroke. Relieve the pressure, page 13.
2. Disconnect the air or hydraulic hose. Plug all
hydraulic hoses immediately, to prevent contamina-
tion of the hydraulic system.
3. Disconnect the fluid hose.
4. Unscrew the coupling nut (103) from the connecting
rod adapter (105). Remove the coupling collars
(104); do not lose or drop them. See F
IG
. 3.
5. Hold the tie rod flats with a wrench to keep the rods
(106) from turning. Unscrew the nuts (107). Remove
the lower (102).
6. To service the lower, refer to manual 308354, sup-
plied. To service the air or hydraulic motor, refer to
the separate motor manual, supplied.
Reconnect the Lower
1. If the connecting rod adapter (105) was discon-
nected, screw it into the air motor shaft. Torque as
noted in F
IG
. 3.
2. Screw the tie rods (106) into the air motor (101).
Using a wrench on the tie rod flats, torque as noted.
3. Make sure the coupling nut (103) and coupling col-
lars (104) are in place on the displacement rod
(DR).
4. Use at least two people to hold the lower while
another reconnects it to the motor (see the CAU-
TION, page 17). Orient the pump's fluid outlet to the
air or hydraulic inlet as noted under Disconnect the
Lower. Place the lower (102) on the tie rods (106).
CAUTION
Use at least two people when lifting, moving, or dis-
connecting the pump. If disconnecting the lower, be
sure to securely brace the pump, or have two people
hold it while another disconnects it.
For cart-mounted pumps, tip the cart backward until
the handle rests on the ground, then disconnect the
lower.
Before disconnecting the lower (102) from the
motor (101), be sure to note the relative position of
the pump's fluid outlet to the air or hydraulic inlet of
the motor. If the motor does not require servicing,
leave it attached to its mounting.
Always use connecting rod adapter 190287 and tie
rods 184596 on hydraulic-powered pumps. Other con-
necting rod adapters and tie rods do not allow sufficient
clearance between the drip pan and coupling nut.